Debian Bug report logs - #542435
grub-probe: error: cannot find a device for /. (LVM2)

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Package: grub-common; Maintainer for grub-common is GRUB Maintainers <pkg-grub-devel@lists.alioth.debian.org>; Source for grub-common is src:grub2 (PTS, buildd, popcon).

Reported by: "Stefan Lippers-Hollmann" <s.L-H@gmx.de>

Date: Wed, 19 Aug 2009 16:15:02 UTC

Severity: important

Found in version grub2/1.96+20090808-1

Done: "Stefan Lippers-Hollmann" <s.L-H@gmx.de>

Bug is archived. No further changes may be made.

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Report forwarded to debian-bugs-dist@lists.debian.org, GRUB Maintainers <pkg-grub-devel@lists.alioth.debian.org>:
Bug#542435; Package grub-common. (Wed, 19 Aug 2009 16:15:08 GMT) (full text, mbox, link).

Acknowledgement sent to "Stefan Lippers-Hollmann" <s.L-H@gmx.de>:
New Bug report received and forwarded. Copy sent to GRUB Maintainers <pkg-grub-devel@lists.alioth.debian.org>. (Wed, 19 Aug 2009 16:15:08 GMT) (full text, mbox, link).

Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: "Stefan Lippers-Hollmann" <s.L-H@gmx.de>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: grub-probe: error: cannot find a device for /. (LVM2)
Date: Wed, 19 Aug 2009 18:12:30 +0200
[Message part 1 (text/plain, inline)]
Package: grub-common
Version: 1.96+20090808-1
Severity: important

Hi

Since 2.02.51-1 (17 Aug 2009), lvm2 depends on dmsetup, which ships a few 
udev rules:

/lib/udev/rules.d/55-dm.rules
/lib/udev/rules.d/60-persistent-storage-dm.rules
/lib/udev/rules.d/95-dm-notify.rules

Trying to call grub-probe (indirectly through grub-install or update-grub)
on a kernel whose initramfs includes these udev rules results in grub-probe
failing to find the / "partition" (a logical volume on LVM2):

# grub-probe  --target=device /
grub-probe: error: cannot find a device for /.

This failure breaks installing grub2 on a pure LVM2 system and renders an 
installed system (which has always been working fine for me) on LVM2 
unbootable, as soon as dmsetup and its udev rules enter the initramfs and 
when update-grub gets invoked by installing kernel updates.

Deleting dmsetup's udev rules and regenerating the initramfs makes 
grub-probe working again.

I am reliably experiencing this problem, which renders the affectable 
systems unbootable on initramfs changes or kernel updates, on 3 systems 
using ext3 and ext4 for / since dmsetup got pulled in by lvm2. It is 
independent of the installed kernel version (2.6.29 - 2.6.31-rc6-git5)
Please feel free to reassign to dmsetup (lvm2), but I assume grub-probe 
simply can't interpret the mangled udev representation since dmsetup got 
installed.

Regards
	Stefan Lippers-Hollmann

$ grep -v -e ^\# -e ^$ /etc/fstab
/dev/sputnik/debian64   /               ext4    defaults,noatime,barrier=0                      1  1
/dev/sputnik/swap       none            swap    defaults                                        0  0
/dev/sputnik/var        /var            ext4    auto,user,exec,dev,noatime,barrier=0            1  2
/var/tmp                /tmp            none    bind                                            0  0
/dev/sputnik/home       /home           ext4    auto,user,exec,nodev,nosuid,noatime,barrier=0   1  2

$ grep -v -e ^\# -e ^$ /boot/grub/grub.cfg 
set default=0                                           
set timeout=3                                           
insmod lvm                                              
set root=(sputnik-debian64)                             
search --no-floppy --fs-uuid --set aed1da63-079a-4a29-9f17-042b49a96b05
if loadfont /usr/share/grub/unicode.pf2 ; then                         
  set gfxmode=1024x768
  insmod gfxterm
  insmod vbe
  if terminal_output.gfxterm ; then true ; else
    # For backward compatibility with versions of terminal.mod that don't
    # understand terminal_output
    terminal gfxterm
  fi
fi
set menu_color_normal=cyan/blue
set menu_color_highlight=white/blue
menuentry "Debian GNU/Linux, Linux 2.6.31-rc6-sidux-amd64" {
        insmod lvm
        set root=(sputnik-debian64)
        search --no-floppy --fs-uuid --set aed1da63-079a-4a29-9f17-042b49a96b05
        linux   /boot/vmlinuz-2.6.31-rc6-sidux-amd64 root=/dev/mapper/sputnik-debian64 ro  vga=791
        initrd  /boot/initrd.img-2.6.31-rc6-sidux-amd64
}

# fdisk -l /dev/sda

Disk /dev/sda: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x9a2f4815

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1       19457   156288321   8e  Linux LVM

# lvdisplay                                            
  --- Logical volume ---                                                
  LV Name                /dev/sputnik/debian64                          
  VG Name                sputnik                                        
  LV UUID                2bOCSD-J1GH-rl6I-ZkqM-Mxlb-X6ip-OIDzvU         
  LV Write Access        read/write                                     
  LV Status              available                                      
  # open                 1                                              
  LV Size                10,00 GB                                       
  Current LE             2560                                           
  Segments               1                                              
  Allocation             inherit                                        
  Read ahead sectors     auto                                           
  - currently set to     256                                            
  Block device           254:0                                          
                                                                        
  --- Logical volume ---                                                
  LV Name                /dev/sputnik/var                               
  VG Name                sputnik                                        
  LV UUID                DEGVDG-Uk35-cDFx-pcEp-ZmA0-Kqdi-wuMz2w         
  LV Write Access        read/write                                     
  LV Status              available                                      
  # open                 1                                              
  LV Size                5,00 GB                                        
  Current LE             1280                                           
  Segments               1                                              
  Allocation             inherit                                        
  Read ahead sectors     auto                                           
  - currently set to     256                                            
  Block device           254:1                                          
                                                                        
  --- Logical volume ---                                                
  LV Name                /dev/sputnik/swap                              
  VG Name                sputnik                                        
  LV UUID                1OfAMK-bxZ9-lgak-nKwk-0SxX-tGaT-VOq6hZ         
  LV Write Access        read/write                                     
  LV Status              available                                      
  # open                 1                                              
  LV Size                4,00 GB                                        
  Current LE             1024                                           
  Segments               1                                              
  Allocation             inherit                                        
  Read ahead sectors     auto
  - currently set to     256
  Block device           254:2

  --- Logical volume ---
  LV Name                /dev/sputnik/home
  VG Name                sputnik
  LV UUID                XQ9Sx6-f2TY-U3WJ-X4fT-dYbQ-yGqS-NBHKcE
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                10,00 GB
  Current LE             2560
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           254:3


=== NOT working, with dmsetup udev rules ===
# grub-probe  --target=device /
grub-probe: error: cannot find a device for /.

# grub-probe  --target=device / -v
grub-probe: info: the size of hd0 is 312581808     
grub-probe: info: the size of hd0 is 312581808     
grub-probe: info: the size of hd0 is 312581808     
grub-probe: info: the size of hd0 is 312581808     
grub-probe: info: the size of hd0 is 312581808     
grub-probe: info: the size of hd0 is 312581808     
grub-probe: info: the size of hd0 is 312581808     
grub-probe: info: changing current directory to /dev
grub-probe: info: changing current directory to dri 
grub-probe: info: changing current directory to snd 
grub-probe: info: changing current directory to net 
grub-probe: info: changing current directory to shm 
grub-probe: info: changing current directory to network
grub-probe: info: changing current directory to pts    
grub-probe: info: changing current directory to sputnik
grub-probe: info: changing current directory to mapper 
grub-probe: info: changing current directory to disk
grub-probe: info: changing current directory to by-label
grub-probe: info: changing current directory to by-uuid
grub-probe: info: changing current directory to by-path
grub-probe: info: changing current directory to by-id
grub-probe: info: changing current directory to block
grub-probe: info: changing current directory to bsg
grub-probe: info: changing current directory to bus
grub-probe: info: changing current directory to usb
grub-probe: info: changing current directory to 004
grub-probe: info: changing current directory to 003
grub-probe: info: changing current directory to 005
grub-probe: info: changing current directory to 002
grub-probe: info: changing current directory to 001
grub-probe: info: changing current directory to input
grub-probe: info: changing current directory to by-path
grub-probe: info: changing current directory to char
grub-probe: error: cannot find a device for /.

# grub-probe  --target=device / -vvv
/tmp/buildd/grub2-1.96+20090808/disk/raid.c:627: Scanning for RAID devices on disk hd0
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:245: Opening `hd0'...                     
grub-probe: info: the size of hd0 is 312581808                                        
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0'...                     
/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda' in open_device()/tmp/buildd/grub2-1.96+20090808/kern/disk.c:333: Closing `hd0'.                                
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:245: Opening `hd0'...                                
grub-probe: info: the size of hd0 is 312581808                                                   
/tmp/buildd/grub2-1.96+20090808/kern/partition.c:106: Detecting gpt_partition_map...             
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0'...                                
/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda' in open_device()/tmp/buildd/grub2-1.96+20090808/kern/partition.c:112: gpt_partition_map detection failed.      
/tmp/buildd/grub2-1.96+20090808/kern/partition.c:106: Detecting sun_partition_map...             
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0'...                                
/tmp/buildd/grub2-1.96+20090808/kern/partition.c:112: sun_partition_map detection failed.        
/tmp/buildd/grub2-1.96+20090808/kern/partition.c:106: Detecting apple_partition_map...           
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0'...                                
/tmp/buildd/grub2-1.96+20090808/partmap/apple.c:126: bad magic (found 0xeb63; wanted 0x4552      
/tmp/buildd/grub2-1.96+20090808/kern/partition.c:112: apple_partition_map detection failed.      
/tmp/buildd/grub2-1.96+20090808/kern/partition.c:106: Detecting pc_partition_map...              
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0'...                                
/tmp/buildd/grub2-1.96+20090808/partmap/pc.c:143: partition 0: flag 0x80, type 0x8e, start 0x3f, len 0x12a18a82                                                                                   
/tmp/buildd/grub2-1.96+20090808/kern/partition.c:117: pc_partition_map detection succeeded.      
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0'...                                
/tmp/buildd/grub2-1.96+20090808/partmap/pc.c:143: partition 0: flag 0x80, type 0x8e, start 0x3f, len 0x12a18a82                                                                                   
/tmp/buildd/grub2-1.96+20090808/partmap/pc.c:143: partition 1: flag 0x0, type 0x0, start 0x0, len 0x0                                                                                             
/tmp/buildd/grub2-1.96+20090808/partmap/pc.c:143: partition 2: flag 0x0, type 0x0, start 0x0, len 0x0                                                                                             
/tmp/buildd/grub2-1.96+20090808/partmap/pc.c:143: partition 3: flag 0x0, type 0x0, start 0x0, len 0x0                                                                                             
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:333: Closing `hd0'.                                  
/tmp/buildd/grub2-1.96+20090808/disk/raid.c:627: Scanning for RAID devices on disk hd0,1         
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:245: Opening `hd0,1'...                              
grub-probe: info: the size of hd0 is 312581808                                                   
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0,1'...                              
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0,1'...                              
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0,1'...                              
/tmp/buildd/grub2-1.96+20090808/partmap/apple.c:126: bad magic (found 0xeb63; wanted 0x4552      
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0,1'...                              
/tmp/buildd/grub2-1.96+20090808/partmap/pc.c:143: partition 0: flag 0x80, type 0x8e, start 0x3f, len 0x12a18a82                                                                                   
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0,1'...                              
/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/kern/disk.c:333: Closing `hd0,1'.                          
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:245: Opening `hd0'...                                
grub-probe: info: the size of hd0 is 312581808                                                   
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0'...                                
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0'...                                
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0'...                                
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0'...                                
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:333: Closing `hd0'.                                  
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:245: Opening `hd0'...                                
grub-probe: info: the size of hd0 is 312581808                                                   
/tmp/buildd/grub2-1.96+20090808/kern/partition.c:106: Detecting gpt_partition_map...             
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0'...                                
/tmp/buildd/grub2-1.96+20090808/kern/partition.c:112: gpt_partition_map detection failed.        
/tmp/buildd/grub2-1.96+20090808/kern/partition.c:106: Detecting sun_partition_map...             
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0'...                                
/tmp/buildd/grub2-1.96+20090808/kern/partition.c:112: sun_partition_map detection failed.        
/tmp/buildd/grub2-1.96+20090808/kern/partition.c:106: Detecting apple_partition_map...           
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0'...                                
/tmp/buildd/grub2-1.96+20090808/partmap/apple.c:126: bad magic (found 0xeb63; wanted 0x4552      
/tmp/buildd/grub2-1.96+20090808/kern/partition.c:112: apple_partition_map detection failed.      
/tmp/buildd/grub2-1.96+20090808/kern/partition.c:106: Detecting pc_partition_map...              
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0'...                                
/tmp/buildd/grub2-1.96+20090808/partmap/pc.c:143: partition 0: flag 0x80, type 0x8e, start 0x3f, len 0x12a18a82                                                                                   
/tmp/buildd/grub2-1.96+20090808/kern/partition.c:117: pc_partition_map detection succeeded.      
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0'...                                
/tmp/buildd/grub2-1.96+20090808/partmap/pc.c:143: partition 0: flag 0x80, type 0x8e, start 0x3f, len 0x12a18a82                                                                                   
/tmp/buildd/grub2-1.96+20090808/partmap/pc.c:143: partition 1: flag 0x0, type 0x0, start 0x0, len 0x0                                                                                             
/tmp/buildd/grub2-1.96+20090808/partmap/pc.c:143: partition 2: flag 0x0, type 0x0, start 0x0, len 0x0                                                                                             
/tmp/buildd/grub2-1.96+20090808/partmap/pc.c:143: partition 3: flag 0x0, type 0x0, start 0x0, len 0x0                                                                                             
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:333: Closing `hd0'.                                  
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:245: Opening `hd0,1'...                              
grub-probe: info: the size of hd0 is 312581808                                                   
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0,1'...                              
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0,1'...                              
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0,1'...                              
/tmp/buildd/grub2-1.96+20090808/partmap/apple.c:126: bad magic (found 0xeb63; wanted 0x4552      
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0,1'...                              
/tmp/buildd/grub2-1.96+20090808/partmap/pc.c:143: partition 0: flag 0x80, type 0x8e, start 0x3f, len 0x12a18a82                                                                                   
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0,1'...                              
/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0,1'...                        
/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0,1'...                           
/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/kern/disk.c:245: Opening `hd0,1'...                                                                                   
grub-probe: info: the size of hd0 is 312581808                                                   
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0,1'...                              
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0,1'...                              
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0,1'...                              
/tmp/buildd/grub2-1.96+20090808/partmap/apple.c:126: bad magic (found 0xeb63; wanted 0x4552      
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0,1'...                              
/tmp/buildd/grub2-1.96+20090808/partmap/pc.c:143: partition 0: flag 0x80, type 0x8e, start 0x3f, len 0x12a18a82                                                                                   
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:333: Closing `hd0,1'.                                
grub-probe: info: changing current directory to /dev                                             
grub-probe: info: changing current directory to dri                                              
grub-probe: info: changing current directory to snd                                              
grub-probe: info: changing current directory to net                                              
grub-probe: info: changing current directory to shm                                              
grub-probe: info: changing current directory to network                                          
grub-probe: info: changing current directory to pts                                              
grub-probe: info: changing current directory to sputnik                                          
grub-probe: info: changing current directory to mapper                                           
grub-probe: info: changing current directory to disk
grub-probe: info: changing current directory to by-label
grub-probe: info: changing current directory to by-uuid
grub-probe: info: changing current directory to by-path
grub-probe: info: changing current directory to by-id
grub-probe: info: changing current directory to block
grub-probe: info: changing current directory to bsg
grub-probe: info: changing current directory to bus
grub-probe: info: changing current directory to usb
grub-probe: info: changing current directory to 004
grub-probe: info: changing current directory to 003
grub-probe: info: changing current directory to 005
grub-probe: info: changing current directory to 002
grub-probe: info: changing current directory to 001
grub-probe: info: changing current directory to input
grub-probe: info: changing current directory to by-path
grub-probe: info: changing current directory to char
grub-probe: error: cannot find a device for /.


=== working, without dmsetup udev rules ===
# rm	/lib/udev/rules.d/55-dm.rules \
	/lib/udev/rules.d/60-persistent-storage-dm.rules \
	/lib/udev/rules.d/95-dm-notify.rules
# update-initramfs -k $(uname -r) -d
# update-initramfs -k $(uname -r) -c
# reboot
===========================================

# grub-probe  --target=device /
/dev/mapper/sputnik-debian64

# grub-probe  --target=device / -v
grub-probe: info: the size of hd0 is 312581808
grub-probe: info: the size of hd0 is 312581808
grub-probe: info: the size of hd0 is 312581808
grub-probe: info: the size of hd0 is 312581808
grub-probe: info: the size of hd0 is 312581808
grub-probe: info: the size of hd0 is 312581808
grub-probe: info: the size of hd0 is 312581808
grub-probe: info: changing current directory to /dev
grub-probe: info: changing current directory to dri
grub-probe: info: changing current directory to snd
grub-probe: info: changing current directory to net
grub-probe: info: changing current directory to shm
grub-probe: info: changing current directory to network
grub-probe: info: changing current directory to pts
grub-probe: info: changing current directory to sputnik
grub-probe: info: changing current directory to mapper
/dev/mapper/sputnik-debian64

# grub-probe  --target=device / -vvv  
/tmp/buildd/grub2-1.96+20090808/disk/raid.c:627: Scanning for RAID devices on disk hd0
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:245: Opening `hd0'...                     
grub-probe: info: the size of hd0 is 312581808                                        
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0'...                     
/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda' in open_device()/tmp/buildd/grub2-1.96+20090808/kern/disk.c:333: Closing `hd0'.                                
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:245: Opening `hd0'...                                
grub-probe: info: the size of hd0 is 312581808                                                   
/tmp/buildd/grub2-1.96+20090808/kern/partition.c:106: Detecting gpt_partition_map...             
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0'...                                
/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda' in open_device()/tmp/buildd/grub2-1.96+20090808/kern/partition.c:112: gpt_partition_map detection failed.      
/tmp/buildd/grub2-1.96+20090808/kern/partition.c:106: Detecting sun_partition_map...             
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0'...                                
/tmp/buildd/grub2-1.96+20090808/kern/partition.c:112: sun_partition_map detection failed.        
/tmp/buildd/grub2-1.96+20090808/kern/partition.c:106: Detecting apple_partition_map...           
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0'...                                
/tmp/buildd/grub2-1.96+20090808/partmap/apple.c:126: bad magic (found 0xeb63; wanted 0x4552      
/tmp/buildd/grub2-1.96+20090808/kern/partition.c:112: apple_partition_map detection failed.      
/tmp/buildd/grub2-1.96+20090808/kern/partition.c:106: Detecting pc_partition_map...              
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0'...                                
/tmp/buildd/grub2-1.96+20090808/partmap/pc.c:143: partition 0: flag 0x80, type 0x8e, start 0x3f, len 0x12a18a82                                                                                   
/tmp/buildd/grub2-1.96+20090808/kern/partition.c:117: pc_partition_map detection succeeded.      
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0'...                                
/tmp/buildd/grub2-1.96+20090808/partmap/pc.c:143: partition 0: flag 0x80, type 0x8e, start 0x3f, len 0x12a18a82                                                                                   
/tmp/buildd/grub2-1.96+20090808/partmap/pc.c:143: partition 1: flag 0x0, type 0x0, start 0x0, len 0x0                                                                                             
/tmp/buildd/grub2-1.96+20090808/partmap/pc.c:143: partition 2: flag 0x0, type 0x0, start 0x0, len 0x0                                                                                             
/tmp/buildd/grub2-1.96+20090808/partmap/pc.c:143: partition 3: flag 0x0, type 0x0, start 0x0, len 0x0                                                                                             
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:333: Closing `hd0'.                                  
/tmp/buildd/grub2-1.96+20090808/disk/raid.c:627: Scanning for RAID devices on disk hd0,1         
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:245: Opening `hd0,1'...                              
grub-probe: info: the size of hd0 is 312581808                                                   
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0,1'...                              
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0,1'...                              
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0,1'...                              
/tmp/buildd/grub2-1.96+20090808/partmap/apple.c:126: bad magic (found 0xeb63; wanted 0x4552      
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0,1'...                              
/tmp/buildd/grub2-1.96+20090808/partmap/pc.c:143: partition 0: flag 0x80, type 0x8e, start 0x3f, len 0x12a18a82                                                                                   
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0,1'...                              
/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/kern/disk.c:333: Closing `hd0,1'.                          
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:245: Opening `hd0'...                                
grub-probe: info: the size of hd0 is 312581808                                                   
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0'...                                
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0'...                                
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0'...                                
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0'...                                
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:333: Closing `hd0'.                                  
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:245: Opening `hd0'...                                
grub-probe: info: the size of hd0 is 312581808                                                   
/tmp/buildd/grub2-1.96+20090808/kern/partition.c:106: Detecting gpt_partition_map...             
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0'...                                
/tmp/buildd/grub2-1.96+20090808/kern/partition.c:112: gpt_partition_map detection failed.        
/tmp/buildd/grub2-1.96+20090808/kern/partition.c:106: Detecting sun_partition_map...             
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0'...                                
/tmp/buildd/grub2-1.96+20090808/kern/partition.c:112: sun_partition_map detection failed.        
/tmp/buildd/grub2-1.96+20090808/kern/partition.c:106: Detecting apple_partition_map...           
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0'...                                
/tmp/buildd/grub2-1.96+20090808/partmap/apple.c:126: bad magic (found 0xeb63; wanted 0x4552      
/tmp/buildd/grub2-1.96+20090808/kern/partition.c:112: apple_partition_map detection failed.      
/tmp/buildd/grub2-1.96+20090808/kern/partition.c:106: Detecting pc_partition_map...              
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0'...                                
/tmp/buildd/grub2-1.96+20090808/partmap/pc.c:143: partition 0: flag 0x80, type 0x8e, start 0x3f, len 0x12a18a82                                                                                   
/tmp/buildd/grub2-1.96+20090808/kern/partition.c:117: pc_partition_map detection succeeded.      
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0'...                                
/tmp/buildd/grub2-1.96+20090808/partmap/pc.c:143: partition 0: flag 0x80, type 0x8e, start 0x3f, len 0x12a18a82                                                                                   
/tmp/buildd/grub2-1.96+20090808/partmap/pc.c:143: partition 1: flag 0x0, type 0x0, start 0x0, len 0x0                                                                                             
/tmp/buildd/grub2-1.96+20090808/partmap/pc.c:143: partition 2: flag 0x0, type 0x0, start 0x0, len 0x0                                                                                             
/tmp/buildd/grub2-1.96+20090808/partmap/pc.c:143: partition 3: flag 0x0, type 0x0, start 0x0, len 0x0                                                                                             
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:333: Closing `hd0'.                                  
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:245: Opening `hd0,1'...                              
grub-probe: info: the size of hd0 is 312581808                                                   
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0,1'...                              
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0,1'...                              
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0,1'...                              
/tmp/buildd/grub2-1.96+20090808/partmap/apple.c:126: bad magic (found 0xeb63; wanted 0x4552      
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0,1'...                              
/tmp/buildd/grub2-1.96+20090808/partmap/pc.c:143: partition 0: flag 0x80, type 0x8e, start 0x3f, len 0x12a18a82                                                                                   
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0,1'...                              
/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0,1'...                        
/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0,1'...                           
/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/util/hostdisk.c:342: opening the device `/dev/sda1' in open_device()/tmp/buildd/grub2-1.96+20090808/kern/disk.c:245: Opening `hd0,1'...                                                                                   
grub-probe: info: the size of hd0 is 312581808
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0,1'...
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0,1'...
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0,1'...
/tmp/buildd/grub2-1.96+20090808/partmap/apple.c:126: bad magic (found 0xeb63; wanted 0x4552
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:389: Reading `hd0,1'...
/tmp/buildd/grub2-1.96+20090808/partmap/pc.c:143: partition 0: flag 0x80, type 0x8e, start 0x3f, len 0x12a18a82
/tmp/buildd/grub2-1.96+20090808/kern/disk.c:333: Closing `hd0,1'.
grub-probe: info: changing current directory to /dev
grub-probe: info: changing current directory to dri
grub-probe: info: changing current directory to snd
grub-probe: info: changing current directory to net
grub-probe: info: changing current directory to shm
grub-probe: info: changing current directory to network
grub-probe: info: changing current directory to pts
grub-probe: info: changing current directory to sputnik
grub-probe: info: changing current directory to mapper
/dev/mapper/sputnik-debian64

-- System Information:
Debian Release: squeeze/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.31-rc6-sidux-amd64 (SMP w/4 CPU cores; PREEMPT)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages grub-common depends on:
ii  base-files             5.0.0             Debian base system miscellaneous f
ii  libc6                  2.9-25            GNU C Library: Shared libraries
ii  libfreetype6           2.3.9-5           FreeType 2 font engine, shared lib
ii  libncurses5            5.7+20090803-1    shared libraries for terminal hand
ii  zlib1g                 1:1.2.3.3.dfsg-15 compression library - runtime

grub-common recommends no packages.

Versions of packages grub-common suggests:
pn  multiboot-doc                 <none>     (no description available)
pn  os-prober                     <none>     (no description available)

-- no debconf information

[signature.asc (application/pgp-signature, inline)]

Information forwarded to debian-bugs-dist@lists.debian.org, GRUB Maintainers <pkg-grub-devel@lists.alioth.debian.org>:
Bug#542435; Package grub-common. (Wed, 19 Aug 2009 18:33:05 GMT) (full text, mbox, link).

Acknowledgement sent to Felix Zielcke <fzielcke@z-51.de>:
Extra info received and forwarded to list. Copy sent to GRUB Maintainers <pkg-grub-devel@lists.alioth.debian.org>. (Wed, 19 Aug 2009 18:33:05 GMT) (full text, mbox, link).

Message #10 received at 542435@bugs.debian.org (full text, mbox, reply):

From: Felix Zielcke <fzielcke@z-51.de>
To: Stefan Lippers-Hollmann <s.L-H@gmx.de>, 542435@bugs.debian.org
Subject: Re: Bug#542435: grub-probe: error: cannot find a device for /. (LVM2)
Date: Wed, 19 Aug 2009 20:30:21 +0200
Am Mittwoch, den 19.08.2009, 18:12 +0200 schrieb Stefan
Lippers-Hollmann:
> Package: grub-common
> Version: 1.96+20090808-1
> Severity: important
> 
> Hi
> 
> Since 2.02.51-1 (17 Aug 2009), lvm2 depends on dmsetup, which ships a few 
> udev rules:
> 
> /lib/udev/rules.d/55-dm.rules
> /lib/udev/rules.d/60-persistent-storage-dm.rules
> /lib/udev/rules.d/95-dm-notify.rules
> 
> Trying to call grub-probe (indirectly through grub-install or update-grub)
> on a kernel whose initramfs includes these udev rules results in grub-probe
> failing to find the / "partition" (a logical volume on LVM2):
> 
> # grub-probe  --target=device /
> grub-probe: error: cannot find a device for /.
> 
> This failure breaks installing grub2 on a pure LVM2 system and renders an 
> installed system (which has always been working fine for me) on LVM2 
> unbootable, as soon as dmsetup and its udev rules enter the initramfs and 
> when update-grub gets invoked by installing kernel updates.
> 
> Deleting dmsetup's udev rules and regenerating the initramfs makes 
> grub-probe working again.
> 
> I am reliably experiencing this problem, which renders the affectable 
> systems unbootable on initramfs changes or kernel updates, on 3 systems 
> using ext3 and ext4 for / since dmsetup got pulled in by lvm2. It is 
> independent of the installed kernel version (2.6.29 - 2.6.31-rc6-git5)
> Please feel free to reassign to dmsetup (lvm2), but I assume grub-probe 
> simply can't interpret the mangled udev representation since dmsetup got 
> installed.
> 

Are the /dev/mapper/* files still created or are there now just
the /dev/vg/lv ones?
grub-probe only supports the /dev/mapper/ ones.

Information forwarded to debian-bugs-dist@lists.debian.org, GRUB Maintainers <pkg-grub-devel@lists.alioth.debian.org>:
Bug#542435; Package grub-common. (Wed, 19 Aug 2009 19:03:10 GMT) (full text, mbox, link).

Acknowledgement sent to "Stefan Lippers-Hollmann" <s.L-H@gmx.de>:
Extra info received and forwarded to list. Copy sent to GRUB Maintainers <pkg-grub-devel@lists.alioth.debian.org>. (Wed, 19 Aug 2009 19:03:10 GMT) (full text, mbox, link).

Message #15 received at 542435@bugs.debian.org (full text, mbox, reply):

From: "Stefan Lippers-Hollmann" <s.L-H@gmx.de>
To: 542435@bugs.debian.org
Cc: Felix Zielcke <fzielcke@z-51.de>
Subject: Re: Bug#542435: grub-probe: error: cannot find a device for /. (LVM2)
Date: Wed, 19 Aug 2009 21:01:20 +0200
[Message part 1 (text/plain, inline)]
Hi

On Wednesday 19 August 2009, Felix Zielcke wrote:
> Am Mittwoch, den 19.08.2009, 18:12 +0200 schrieb Stefan
> Lippers-Hollmann:
[...]
> > Since 2.02.51-1 (17 Aug 2009), lvm2 depends on dmsetup, which ships a few 
> > udev rules:
> > 
> > /lib/udev/rules.d/55-dm.rules
> > /lib/udev/rules.d/60-persistent-storage-dm.rules
> > /lib/udev/rules.d/95-dm-notify.rules
> > 
> > Trying to call grub-probe (indirectly through grub-install or update-grub)
> > on a kernel whose initramfs includes these udev rules results in grub-probe
> > failing to find the / "partition" (a logical volume on LVM2):
> > 
> > # grub-probe  --target=device /
> > grub-probe: error: cannot find a device for /.
> > 
> > This failure breaks installing grub2 on a pure LVM2 system and renders an 
> > installed system (which has always been working fine for me) on LVM2 
> > unbootable, as soon as dmsetup and its udev rules enter the initramfs and 
> > when update-grub gets invoked by installing kernel updates.
> > 
> > Deleting dmsetup's udev rules and regenerating the initramfs makes 
> > grub-probe working again.
> > 
> > I am reliably experiencing this problem, which renders the affectable 
> > systems unbootable on initramfs changes or kernel updates, on 3 systems 
> > using ext3 and ext4 for / since dmsetup got pulled in by lvm2. It is 
> > independent of the installed kernel version (2.6.29 - 2.6.31-rc6-git5)
> > Please feel free to reassign to dmsetup (lvm2), but I assume grub-probe 
> > simply can't interpret the mangled udev representation since dmsetup got 
> > installed.
> > 
> 
> Are the /dev/mapper/* files still created or are there now just
> the /dev/vg/lv ones?
> grub-probe only supports the /dev/mapper/ ones.

=== working, without dmsetup udev rules ===

$ ls -al /dev/mapper/ /dev/sputnik/
/dev/mapper/:
insgesamt 0
drwxr-xr-x  2 root root     140 19. Aug 20:52 .
drwxr-xr-x 17 root root    2880 19. Aug 20:52 ..
crw-rw----  1 root root  10, 60 19. Aug 2009  control
brw-rw----  1 root disk 254,  0 19. Aug 2009  sputnik-debian64
brw-rw----  1 root disk 254,  3 19. Aug 20:52 sputnik-home
brw-rw----  1 root disk 254,  2 19. Aug 20:52 sputnik-swap
brw-rw----  1 root disk 254,  1 19. Aug 20:52 sputnik-var

/dev/sputnik/:
insgesamt 0
drwxr-xr-x  2 root root  120 19. Aug 20:52 .
drwxr-xr-x 17 root root 2880 19. Aug 20:52 ..
lrwxrwxrwx  1 root root   28 19. Aug 2009  debian64 -> /dev/mapper/sputnik-debian64
lrwxrwxrwx  1 root root   24 19. Aug 20:52 home -> /dev/mapper/sputnik-home
lrwxrwxrwx  1 root root   24 19. Aug 20:52 swap -> /dev/mapper/sputnik-swap
lrwxrwxrwx  1 root root   23 19. Aug 20:52 var -> /dev/mapper/sputnik-var

# grub-probe  --target=device /
/dev/mapper/sputnik-debian64


=== NOT working, with dmsetup udev rules ===

$ ls -al /dev/mapper/ /dev/sputnik/
/dev/mapper/:
insgesamt 0
drwxr-xr-x  2 root root    140 19. Aug 20:56 .
drwxr-xr-x 17 root root   2860 19. Aug 20:57 ..
crw-rw----  1 root root 10, 60 19. Aug 2009  control
lrwxrwxrwx  1 root root      7 19. Aug 2009  sputnik-debian64 -> ../dm-0
lrwxrwxrwx  1 root root      7 19. Aug 20:56 sputnik-home -> ../dm-3
lrwxrwxrwx  1 root root      7 19. Aug 20:56 sputnik-swap -> ../dm-2
lrwxrwxrwx  1 root root      7 19. Aug 20:56 sputnik-var -> ../dm-1

/dev/sputnik/:
insgesamt 0
drwxr-xr-x  2 root root  120 19. Aug 20:56 .
drwxr-xr-x 17 root root 2860 19. Aug 20:57 ..
lrwxrwxrwx  1 root root    7 19. Aug 2009  debian64 -> ../dm-0
lrwxrwxrwx  1 root root    7 19. Aug 20:56 home -> ../dm-3
lrwxrwxrwx  1 root root    7 19. Aug 20:56 swap -> ../dm-2
lrwxrwxrwx  1 root root    7 19. Aug 20:56 var -> ../dm-1

# grub-probe  --target=device /
grub-probe: error: cannot find a device for /.

Regards
	Stefan Lippers-Hollmann

[signature.asc (application/pgp-signature, inline)]

Information forwarded to debian-bugs-dist@lists.debian.org, GRUB Maintainers <pkg-grub-devel@lists.alioth.debian.org>:
Bug#542435; Package grub-common. (Wed, 19 Aug 2009 19:15:06 GMT) (full text, mbox, link).

Acknowledgement sent to Felix Zielcke <fzielcke@z-51.de>:
Extra info received and forwarded to list. Copy sent to GRUB Maintainers <pkg-grub-devel@lists.alioth.debian.org>. (Wed, 19 Aug 2009 19:15:06 GMT) (full text, mbox, link).

Message #20 received at 542435@bugs.debian.org (full text, mbox, reply):

From: Felix Zielcke <fzielcke@z-51.de>
To: Stefan Lippers-Hollmann <s.L-H@gmx.de>
Cc: 542435@bugs.debian.org
Subject: Re: Bug#542435: grub-probe: error: cannot find a device for /. (LVM2)
Date: Wed, 19 Aug 2009 21:12:33 +0200
Am Mittwoch, den 19.08.2009, 21:01 +0200 schrieb Stefan
Lippers-Hollmann:

> === NOT working, with dmsetup udev rules ===
> 
> $ ls -al /dev/mapper/ /dev/sputnik/
> /dev/mapper/:
> insgesamt 0
> drwxr-xr-x  2 root root    140 19. Aug 20:56 .
> drwxr-xr-x 17 root root   2860 19. Aug 20:57 ..
> crw-rw----  1 root root 10, 60 19. Aug 2009  control
> lrwxrwxrwx  1 root root      7 19. Aug 2009  sputnik-debian64 -> ../dm-0
> lrwxrwxrwx  1 root root      7 19. Aug 20:56 sputnik-home -> ../dm-3
> lrwxrwxrwx  1 root root      7 19. Aug 20:56 sputnik-swap -> ../dm-2
> lrwxrwxrwx  1 root root      7 19. Aug 20:56 sputnik-var -> ../dm-1
> 

This just can't work with the way how grub-probe currently works.
stat() is used to map the filesystem paths to devices.
So in that case it uses the /dev/dm-* ones instead of the /dev/mapper/*
But grub-probe generates the (vg-lv) grub device from the file name and
then looks for all LVM headers if there is such a volumegroup and
logical volume.

It would be easier to fix in lvm2 package but because this is an
upstream change of it we need to adress this in grub-probe.
But I fail to get an idea how to fix this.

Reply sent to "Stefan Lippers-Hollmann" <s.L-H@gmx.de>:
You have taken responsibility. (Fri, 21 Aug 2009 03:27:04 GMT) (full text, mbox, link).

Notification sent to "Stefan Lippers-Hollmann" <s.L-H@gmx.de>:
Bug acknowledged by developer. (Fri, 21 Aug 2009 03:27:04 GMT) (full text, mbox, link).

Message #25 received at 542435-done@bugs.debian.org (full text, mbox, reply):

From: "Stefan Lippers-Hollmann" <s.L-H@gmx.de>
To: 542435-done@bugs.debian.org
Subject: Re: Bug#542435: grub-probe: error: cannot find a device for /. (LVM2)
Date: Fri, 21 Aug 2009 05:23:11 +0200
[Message part 1 (text/plain, inline)]
Hi

On Friday 21 August 2009, Felix Zielcke wrote:
> Am Mittwoch, den 19.08.2009, 21:01 +0200 schrieb Stefan
> Lippers-Hollmann:
> 
> > === NOT working, with dmsetup udev rules ===
> > 
> > $ ls -al /dev/mapper/ /dev/sputnik/
> > /dev/mapper/:
> > insgesamt 0
> > drwxr-xr-x  2 root root    140 19. Aug 20:56 .
> > drwxr-xr-x 17 root root   2860 19. Aug 20:57 ..
> > crw-rw----  1 root root 10, 60 19. Aug 2009  control
> > lrwxrwxrwx  1 root root      7 19. Aug 2009  sputnik-debian64 -> ../dm-0
> > lrwxrwxrwx  1 root root      7 19. Aug 20:56 sputnik-home -> ../dm-3
> > lrwxrwxrwx  1 root root      7 19. Aug 20:56 sputnik-swap -> ../dm-2
> > lrwxrwxrwx  1 root root      7 19. Aug 20:56 sputnik-var -> ../dm-1
> > 
> 
> This just can't work with the way how grub-probe currently works.
> stat() is used to map the filesystem paths to devices.
> So in that case it uses the /dev/dm-* ones instead of the /dev/mapper/*
> But grub-probe generates the (vg-lv) grub device from the file name and
> then looks for all LVM headers if there is such a volumegroup and
> logical volume.
> 
> It would be easier to fix in lvm2 package but because this is an
> upstream change of it we need to adress this in grub-probe.
> But I fail to get an idea how to fix this.

This is now fixed with 

lvm2 (2.02.51-2) unstable; urgency=low

  * Make mapper/* the real device, dm-* a symlink. (closes: #542422)

 -- Bastian Blank <waldi@debian.org>  Thu, 20 Aug 2009 21:23:14 +0200

Sorry about the noise - and I just hope dmsetup keeps its device nodes this
way.

Regards
	Stefan Lippers-Hollmann

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Bug archived. Request was from Debbugs Internal Request <owner@bugs.debian.org> to internal_control@bugs.debian.org. (Fri, 18 Sep 2009 07:32:45 GMT) (full text, mbox, link).

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