Re: segmentation fault in btrfs tool v4.15

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

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On 2018年02月09日 15:23, Ralph Gauges wrote:
> Hi Qu,
> 
> I applied the patch to the sources of v4.15 and ran it in gdb. This is
> the result.
> 
> (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
> ERROR: child eb corrupted: parent bytenr=247283269632 item=23 parent
> level=1 child level=2
> ERROR: cannot open file system
> [Inferior 1 (process 7149) exited with code 01]
> 
> 
> So obviously it does not crash any more. Thanks.
> Since you are an expert on the btrfs filesystem, any hints as to how I
> could fix my backup
> partition?

Guys in mail list may have better ideas, CCed to mail list.

In fact the problem all happens in extent tree, may be we could salvage
something by RO mount it?

If kernel can't mount it even RO, then "btrfs restore" may be your last
chance.

Thanks,
Qu

> This output from btrfs seems to suggest that "btrfs check"
> can't handle this error?!
> Or this this last error something else that didn't show up so far
> because of the segfault?
> 
> Thanks
> 
> Ralph
> 
> 


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