Re: corrupt xfs log

[Bill O'Donnell <billodo@redhat.com>]

On Fri, Aug 18, 2017 at 01:56:31PM +0200, Ingard - wrote:
> After a server crash we've encountered a corrupt xfs filesystem. When
> trying to mount said filesystem normally the system hangs.
> This was initially on a ubuntu trusty server with 3.13 kernel with
> xfsprogs 3.1.9
> 
> We've installed a newer kernel (4.4.0-92) and compiled xfsprogs v
> 4.12.0 from source. We're still not able to mount the filesystem (and
> replay the log) normally.
> We are able to mount it -o ro,norecovery, but we're reluctant to do
> xfs_repair -L without trying everything we can first. The filesystem
> is browsable albeit a few paths which gives an error : "Structure
> needs cleaning"
> 
> Does anyone have any advice as to how we might recover/repair the
> corrupt log so we can replay it? Or is xfs_repair -L the only way
> forward?

Can you try xfs_repair -n (only scans the fs and reports what repairs
would be made)?

Thanks-
Bill


> 
> 
> Excerpt from kern.log:
> 2017-08-17T13:40:41.122121+02:00 dn-238 kernel: [  294.300347] XFS
> (sdd1): Mounting V4 filesystem in no-recovery mode. Filesystem will be
> inconsistent.
> 
> 2017-08-17T17:04:54.794194+02:00 dn-238 kernel: [12548.400260] XFS
> (sdd1): Metadata corruption detected at xfs_inode_buf_verify+0x6f/0xd0
> [xfs], xfs_inode block 0x81c9c210
> 2017-08-17T17:04:54.794216+02:00 dn-238 kernel: [12548.400342] XFS
> (sdd1): Unmount and run xfs_repair
> 2017-08-17T17:04:54.794218+02:00 dn-238 kernel: [12548.400374] XFS
> (sdd1): First 64 bytes of corrupted metadata buffer:
> 2017-08-17T17:04:54.794220+02:00 dn-238 kernel: [12548.400418]
> ffff880171fff000: 3f 1a 33 54 5b 55 85 0b 7c f5 c6 d5 cf 51 47 41
> ?.3T[U..|....QGA
> 2017-08-17T17:04:54.794222+02:00 dn-238 kernel: [12548.400473]
> ffff880171fff010: 97 ba ba 03 5c e4 02 7a e6 bc fb 5d f1 72 db c1
> ....\..z...].r..
> 2017-08-17T17:04:54.794223+02:00 dn-238 kernel: [12548.400527]
> ffff880171fff020: c8 ad 3a 76 c7 e4 20 92 88 a2 35 0c 1f 36 cf b5
> ..:v.. ...5..6..
> 2017-08-17T17:04:54.794226+02:00 dn-238 kernel: [12548.400581]
> ffff880171fff030: 8a bc 42 75 86 50 a0 a2 be 2c 2d 99 96 2d e1 ee
> ..Bu.P...,-..-..
> 
> kind regards
> ingard
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