Debian Bug report logs - #856833
/sbin/wipefs: wipefs does not delete ZFS label/signature

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

From: Dennis Schafroth <dennis@schafroth.dk>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: /sbin/wipefs: wipefs does not delete ZFS label/signature

Date: Sun, 05 Mar 2017 11:14:48 +0100

Package: util-linux
Version: 2.29.1-1
Severity: normal
File: /sbin/wipefs

Dear Maintainer,

*** Reporter, please consider answering these questions, where appropriate ***

   * Upgraded to debian stretch using dist-upgrade lead to one partition did not mount due to multiple labels
     I use to have a ZFS partition on this partition but reverted back to ext4. I must have failed to clean it completely.
     Mount in jessie using UUID work fine but fails in stretch (but that's another problem).
     
   * Attempting to fix the problem by deleting the ZFS I used the wipefs to list the label and use it to delete it
     ineffective)?
   * wipefs writes that it deletes it, but does not seem to do anything. The extra signature is still there
     and mount using UUID still fails.
   * wipefs would delete the ZFS signature and mount using UUID would work.

Did the following:

# wipefs /dev/sda4
offset               type
----------------------------------------------------------------
0xe392bbb000         zfs_member   [filesystem]
                     LABEL: tank
		                          UUID:  6384895573301081576

0x438                ext4   [filesystem]
                     UUID:  8bd4a82d-3d36-45c6-8d51-fa4b68d65051


#  wipefs /dev/sda4 -o 0xe392bbb000 -f
/dev/sda4: 8 bytes were erased at offset 0xe392bbb000 (zfs_member): 0c b1 ba 00 00 00 00 0

However it is still listed. But second:

# wipefs /dev/sda4 -o 0xe392bbb000 -f
wipefs: /dev/sda4: offset 0xe392bbb000 not found

Tried rebooting but did not change anything

cheers,
:-Dennis Schafroth


-- System Information:
Debian Release: 9.0
Architecture: amd64 (x86_64)

Kernel: Linux 4.9.0-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages util-linux depends on:
ii  libblkid1      2.29.1-1
ii  libc6          2.24-9
ii  libfdisk1      2.29.1-1
ii  libmount1      2.29.1-1
ii  libncursesw5   6.0+20161126-1
ii  libpam0g       1.1.8-3.5
ii  libselinux1    2.6-3
ii  libsmartcols1  2.29.1-1
ii  libsystemd0    232-18
ii  libtinfo5      6.0+20161126-1
ii  libudev1       232-18
ii  libuuid1       2.29.1-1
ii  zlib1g         1:1.2.8.dfsg-5

util-linux recommends no packages.

Versions of packages util-linux suggests:
pn  dosfstools           <none>
pn  kbd | console-tools  <none>
ii  util-linux-locales   2.29.1-1

-- no debconf information

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