Debian Bug report logs - #703474
/sbin/btrfsck: btrfsck does an infinite loop with --repair on i386 not on amd64

Toggle useless messages

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

From: Russell Coker <russell@coker.com.au>

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

Subject: /sbin/btrfsck: btrfsck does an infinite loop with --repair on i386 not on amd64

Date: Wed, 20 Mar 2013 16:31:16 +1100

Package: btrfs-tools
Version: 0.19+20130131-3+really20121004-1
Severity: important
File: /sbin/btrfsck
Tags: upstream

Below is the gdb backtrace from a version of btrfs-tools that I built with
debugging support.  Both the debugging version I compiled and the versions in
the Debian repository (both the "wheezy" 0.19+20120328-7.1 and "unstable"
0.19+20130131-3+really20121004-1 versions) hang after a few minutes.  When
it hangs it makes no system calls and is just in a CPU loop.

The same filesystem image when checked on AMD64 will complete.

This is an issue for me at the moment because the bootable USB device I use 
for
recovering unbootable systems is i386.  But it will also affect anyone who uses
BTRFS on i386.


Program received signal SIGINT, Interrupt.
0x08074c03 in rb_next (node=0x8149498) at rbtree.c:338
338     rbtree.c: No such file or directory.
(gdb) bt
#0  0x08074c03 in rb_next (node=0x8149498) at rbtree.c:338
#1  0x08074f25 in __tree_search (root=0x809f18c, offset=47318015451136, 
    size=1, prev_ret=0xbffff230) at extent-cache.c:77
#2  0x08075142 in find_first_cache_extent (tree=0x809f18c, 
    start=47318015451136) at extent-cache.c:138
#3  0x0807603c in find_first_extent_bit (tree=0x809f18c, start=47318015451136, 
    start_ret=0xbffff2e0, end_ret=0xbffff2e8, bits=22) at extent_io.c:438
#4  0x0806339e in btrfs_lookup_block_group (info=0x809f108, 
    bytenr=47318015451136) at extent-tree.c:213
#5  0x080678cf in update_pinned_extents (root=0x809d240, 
    bytenr=47318015451136, num=1013489549123370216, pin=1)
    at extent-tree.c:1895
#6  0x080680b7 in btrfs_pin_extent (fs_info=0x809f108, bytenr=210453397504, 
    num_bytes=1013536656685423848) at extent-tree.c:2062
#7  0x08053eed in check_extent_refs (trans=0x809dbf0, root=0x81780b0, 
    extent_cache=0xbffff474, repair=1) at btrfsck.c:3294
#8  0x080547bf in check_extents (trans=0x809dbf0, root=0x81780b0, repair=1)
    at btrfsck.c:3461
#9  0x08054c7e in main (ac=1, av=0xbffff814) at btrfsck.c:3585


-- System Information:
Debian Release: 7.0
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing')
Architecture: i386 (i686)

Kernel: Linux 3.2.0-4-686-pae (SMP w/2 CPU cores)
Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages btrfs-tools depends on:
ii  e2fslibs    1.42.5-1
ii  libc6       2.13-38
ii  libcomerr2  1.42.5-1
ii  libuuid1    2.20.1-5.3
ii  zlib1g      1:1.2.7.dfsg-13

btrfs-tools recommends no packages.

btrfs-tools suggests no packages.

-- no debconf information

Message #10 received at 703474@bugs.debian.org (full text, mbox, reply):

From: Russell Coker <russell@coker.com.au>

To: 703474@bugs.debian.org

Subject: also happens on AMD64

Date: Wed, 20 Mar 2013 17:19:36 +1100

It turns out that the bug happens on AMD64 as well, it just gets past the 
place where the bug occurs on i386 before doing so.

Message #15 received at 703474-done@bugs.debian.org (full text, mbox, reply):

From: Adam Borowski <kilobyte@angband.pl>

To: 703474-done@bugs.debian.org

Subject: almost certainly fixed

Date: Sun, 16 Jun 2019 14:42:26 +0200

> Found in version btrfs-tools/0.19+20130131-3+really20121004-1

This version is so old, from the very beginning of btrfs being in mainline,
that it'd be a waste of time to even try to reproduce the bug (and you
pretty surely don't have the filesystem in question anymore).  The code in
question underwent lots of changes including near-complete refactorings,
thus the bug is pretty certainly gone (and replaced by fresh ones).

Thus, closing.


Meow!
-- 
⢀⣴⠾⠻⢶⣦⠀
⣾⠁⢰⠒⠀⣿⡁
⢿⡄⠘⠷⠚⠋⠀ A true bird-watcher waves his tail while doing so.
⠈⠳⣄⠀⠀⠀⠀

Send a report that this bug log contains spam.