Re: segmentation fault in btrfs tool v4.15

[Qu Wenruo <quwenruo.btrfs@gmx.com>]

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On 2018年02月06日 15:56, Ralph Gauges wrote:
> Hi,
> 
> I recently started using the btrfs file system on my backup disk and
> until a power failure during a backup everything seemed to work well.
> Due a power failure however, the file systems seems to have become
> corrupted and all trials to check or repair it so far have lead to a
> segmentation fault.
> 
> Normally I am using Ubuntu 17.10 and the btrfs version that goes along
> with it, but for testing purposes, I compiled my own version
> (btrfs-progs v4.15).
> Unfortunately the segmentation fault is also present in this latest
> version. At the end of this email, you can see the output from btrfs
> when I try to check the partition as well as the backtrace from gdb. I
> hope that helps.
> 
> My system is running kernel 4.13.0-32-generic on x86_64.
> 
> If you need any additional information please contace me directly since
> I don't subscribe to the mailing list.
> 
> Sincerily
> 
> Ralph Gauges
> 
> 
> 
> 
> 
> 
> (gdb) set args check /dev/sdf1
> (gdb) run
> Starting program: /home/gauges/Applications/bin/btrfs check /dev/sdf1
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
> parent transid verify failed on 266195058688 wanted 1857 found 1864
> parent transid verify failed on 266195058688 wanted 1857 found 1864
> parent transid verify failed on 266195058688 wanted 1857 found 1864
> parent transid verify failed on 266195058688 wanted 1857 found 1864
> Ignoring transid failure
> Checking filesystem on /dev/sdf1
> UUID: 9ccb1eaa-a9ae-46f3-8885-fba4799d6e85
> parent transid verify failed on 266196516864 wanted 1858 found 1864
> parent transid verify failed on 266196516864 wanted 1858 found 1864
> parent transid verify failed on 266196516864 wanted 1858 found 1864
> parent transid verify failed on 266196516864 wanted 1858 found 1864
> Ignoring transid failure
> parent transid verify failed on 266196205568 wanted 1858 found 1864
> parent transid verify failed on 266196205568 wanted 1858 found 1864
> parent transid verify failed on 266196205568 wanted 1858 found 1864
> parent transid verify failed on 266196205568 wanted 1858 found 1864
> Ignoring transid failure
> 
> Program received signal SIGSEGV, Segmentation fault.
> 0x00005555555bf7a7 in btrfs_extent_flags (s=0xcc344065,
> eb=0x5555584acce0) at ctree.h:1694
> 1694    BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item,
> flags, 64);
> (gdb) bt
> #0  0x00005555555bf7a7 in btrfs_extent_flags (s=0xcc344065,
> eb=0x5555584acce0) at ctree.h:1694
> #1  build_roots_info_cache (info=0x555555821a00) at cmds-check.c:14285

Would you please show the value of eb->start?

And possible function call of btrfs_print_tree(info->extent_root, eb, 1)
and its result.

Thanks,
Qu

> #2  repair_root_items (info=0x555555821a00) at cmds-check.c:14450
> #3  cmd_check (argc=<optimized out>, argv=<optimized out>) at
> cmds-check.c:14965
> #4  0x0000555555566320 in main (argc=2, argv=0x7fffffffde30) at btrfs.c:302
> (gdb)
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