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Re: xfs_db -c frag -r /dev/sdb1 segmentation fault

To: Robert Pipca <robertpipca@xxxxxxxxx>
Subject: Re: xfs_db -c frag -r /dev/sdb1 segmentation fault
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Sat, 2 Oct 2010 20:39:03 +1000
Cc: xfs@xxxxxxxxxxx
In-reply-to: <AANLkTi=kzGSGtmk8a_eu5n9w6wbvt_f28Va9gSeWNgCe@xxxxxxxxxxxxxx>
References: <AANLkTi=kzGSGtmk8a_eu5n9w6wbvt_f28Va9gSeWNgCe@xxxxxxxxxxxxxx>
User-agent: Mutt/1.5.20 (2009-06-14)
On Fri, Oct 01, 2010 at 05:06:08PM -0300, Robert Pipca wrote:
> Hi,
> 
> I'm using kernel 2.6.34.7 on a gentoo amd64 system.
> 
> Towards the end of the command, I get:
> 
> read(4, 
> "INA\350\2\1\0\0\0\0\377\376\0\0\377\376\0\0\0\2\0\0\0\0\0\0\0\0\0\0\0\1L"...,
> 16384) = 16384
> lseek(4, 352256, SEEK_SET)              = 352256
> read(4, 
> "INA\350\2\1\0\0\0\0\377\376\0\0\377\376\0\0\0\2\0\0\0\0\0\0\0\0\0\0\0\1L"...,
> 16384) = 16384
> lseek(4, 376832, SEEK_SET)              = 376832
> read(4, 
> "INA\350\2\1\0\0\0\0\377\376\0\0\377\376\0\0\0\2\0\0\0\0\0\0\0\0\0\0\0\1L"...,
> 16384) = 16384
> lseek(4, 393216, SEEK_SET)              = 393216
> read(4, 
> "INA\350\2\1\0\0\0\0\377\376\0\0\377\376\0\0\0\2\0\0\0\0\0\0\0\0\0\0\0\1L"...,
> 16384) = 16384
> lseek(4, 417792, SEEK_SET)              = 417792
> read(4, 
> "INA\350\2\1\0\0\0\0\377\376\0\0\377\376\0\0\0\2\0\0\0\0\0\0\0\0\0\0\0\1L"...,
> 16384) = 16384
> lseek(4, 434176, SEEK_SET)              = 434176
> read(4, 
> "INA\350\2\1\0\0\0\0\377\376\0\0\377\376\0\0\0\2\0\0\0\0\0\0\0\0\0\0\0\1L"...,
> 16384) = 16384
> lseek(4, 450560, SEEK_SET)              = 450560
> read(4, 
> "INA\350\2\1\0\0\0\0\377\376\0\0\377\376\0\0\0\2\0\0\0\0\0\0\0\0\0\0\0\1L"...,
> 16384) = 16384
> lseek(4, 475136, SEEK_SET)              = 475136
> read(4, 
> "INA\350\2\1\0\0\0\0\377\376\0\0\377\376\0\0\0\2\0\0\0\0\0\0\0\0\0\0\0\1L"...,
> 16384) = 16384
> lseek(4, 491520, SEEK_SET)              = 491520
> read(4, 
> "INA\350\2\1\0\0\0\0\377\376\0\0\377\376\0\0\0\2\0\0\0\0\0\0\0\0\0\0\0\1L"...,
> 16384) = 16384
> lseek(4, 516096, SEEK_SET)              = 516096
> read(4, 
> "INA\350\2\1\0\0\0\0\377\376\0\0\377\376\0\0\0\2\0\0\0\0\0\0\0\0\0\0\0\1L"...,
> 16384) = 16384
> lseek(4, 14190936064, SEEK_SET)         = 14190936064
> read(4, 
> "BMAP\0\0\0\n\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\0\0\0\0\0\0\0\0\0"...,
> 4096) = 4096
> lseek(4, 532480, SEEK_SET)              = 532480
> read(4, 
> "IN\201\240\2\3\0\0\0\0\377\376\0\0\377\376\0\0\0\1\0\0\0\0\0\0\0\0\0\0\0\21L"...,
> 16384) = 16384
> lseek(4, 37129601024, SEEK_SET)         = 37129601024
> read(4, 
> "BMAP\0\0\0\n\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\0\0\0\0\0\0\0\0\0"...,
> 4096) = 4096
> lseek(4, 37028130816, SEEK_SET)         = 37028130816
> read(4, 
> "BMAP\0\0\0\n\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\0\0\0\0\0\0\0\0\0"...,
> 4096) = 4096
> lseek(4, 36522024960, SEEK_SET)         = 36522024960
> read(4, 
> "\177\260g\203\223s\231\364\273\222\276\34\363~\253\355\271\271\17h\237\v\357\274\230\25\334\351x\2719&\34"...,
> 4096) = 4096
> brk(0x26af000)                          = 0x26af000
> brk(0x26a0000)                          = 0x26a0000
> mmap(NULL, 200704, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
> -1, 0) = 0x7ff07237e000
> brk(0x2690000)                          = 0x2690000
> --- SIGSEGV (Segmentation fault) @ 0 (0) ---
> +++ killed by SIGSEGV +++
> 
> 
> Is this a kernel or a XFS problem?

It's an xfs_db problem. what version are you running (xfs_db -V)?
Can you build a non-stripped xfs_db executable and run it under gdb
so we can get a stack trace and location of where the SEGV is
occurring?

Note that the crash could be caused by a corrupted filesystem.
Running xfs_repair -n over the filesystem will tell you if there are
any problems in the filesystem. If there are, can you post the
output of the repair command as well?

Cheers,

Dave.
-- 
Dave Chinner
david@xxxxxxxxxxxxx

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