Re: btrfs check bug

["Jan Köster" <jan.koester@gmx.net>]

Am Dienstag, 18. April 2017, 21:34:33 CEST schrieben Sie:
> Hi,
> 
> i have to try to create a new extent-tree after checksum error not solveable
> with srub or init-csum-tree. Now i got this failure output from btrfs
> --repair:
>  
> ERROR: errors found in extent allocation tree or chunk allocation
> Fixed 0 roots.
> checking free space cache
> checking fs roots
> root 5 missing its root dir, recreating
> btrfs unable to find ref byte nr 2279425310720 parent 0 root 5  owner 3
> offset 0 btrfs unable to find ref byte nr 2279422181376 parent 0 root 5
>  owner 2 offset 1 btrfs unable to find ref byte nr 2279422672896 parent 0
> root 5  owner 1 offset 1 btrfs unable to find ref byte nr 2279413121024
> parent 0 root 5  owner 0 offset 1 cmds-check.c:3370: check_inode_recs:
> BUG_ON `ret` triggered, value -17 btrfs(+0x50788)[0x5565c775b788]
> btrfs(+0x507db)[0x5565c775b7db]
> btrfs(+0x598e6)[0x5565c77648e6]
> btrfs(cmd_check+0x2bd4)[0x5565c7770185]
> btrfs(main+0x8b)[0x5565c771c0f5]
> /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf1)[0x7f76045232b1]
> btrfs(_start+0x2a)[0x5565c771bd7a]
> enabling repair mode
> Checking filesystem on /dev/disk/by-label/home
> UUID: 74454fdd-035b-4a3d-98ec-e38d3e7bcd6b
> cache and super generation don't match, space cache will be invalidated
> Failed to find [2278878576640, 168, 16384]
> Failed to find [2278878593024, 168, 16384]
> Failed to find [2278878609408, 168, 16384]
> Failed to find [2278878625792, 168, 16384]
> --
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I have try a chunck recover to solve my problem after this i got this error 
with btrfs check:

root@dibsi:/# gdb --args btrfs check /dev/disk/by-label/home 
GNU gdb (Debian 7.12-6) 7.12.0.20161007-git
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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For help, type "help".
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Reading symbols from btrfs...done.
(gdb) r
Starting program: /usr/local/bin/btrfs check /dev/disk/by-label/home
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Checking filesystem on /dev/disk/by-label/home
UUID: 74454fdd-035b-4a3d-98ec-e38d3e7bcd6b
checking extents
parent transid verify failed on 2278878494720 wanted 1961093 found 1961096
Ignoring transid failure

Program received signal SIGSEGV, Segmentation fault.
__memcpy_ssse3 () at ../sysdeps/x86_64/multiarch/memcpy-ssse3.S:130
130     ../sysdeps/x86_64/multiarch/memcpy-ssse3.S: Datei oder Verzeichnis 
nicht gefunden.
(gdb) bt
#0  __memcpy_ssse3 () at ../sysdeps/x86_64/multiarch/memcpy-ssse3.S:130
#1  0x000055555557e4ce in memcpy (__len=439, __src=<optimized out>, 
__dest=0x5555558641c0)
    at /usr/include/x86_64-linux-gnu/bits/string3.h:53
#2  read_extent_buffer (eb=eb@entry=0x5555558292e0, 
dst=dst@entry=0x7fffffffe3f0, start=<optimized out>, 
    len=len@entry=439) at extent_io.c:863
#3  0x00005555555b31e6 in check_chunks_and_extents 
(root=root@entry=0x5555558641c0) at cmds-check.c:9881
#4  0x00005555555b7240 in cmd_check (argc=<optimized out>, argv=<optimized 
out>) at cmds-check.c:12977
#5  0x00005555555650f5 in main (argc=2, argv=0x7fffffffec80) at btrfs.c:246