Re: corrupt xfs log

[Brian Foster <bfoster@redhat.com>]

On Mon, Aug 21, 2017 at 02:08:43PM +0200, Ingard - wrote:
> On Fri, Aug 18, 2017 at 2:17 PM, Brian Foster <bfoster@redhat.com> wrote:
> > On Fri, Aug 18, 2017 at 07:02:24AM -0500, Bill O'Donnell wrote:
> >> 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)?
> >>
> >
> > An xfs_metadump of the fs might be useful as well. Then we can see if we
> > can reproduce the mount hang on latest kernels and if so, potentially
> > try and root cause it.
> >
> > Brian
> 
> Here is a link for the metadump :
> https://www.jottacloud.com/p/ingardme/95ec2e45ba80431d962345981d38bdff

This points to a 29GB image file, apparently uncompressed..? Could you
upload a compressed file? Thanks.

Brian

> And the repair -n output :
> https://www.jottacloud.com/p/ingardme/0205c6ca6f7e495ebcda5f255b96f63d
> 
> kind regards
> ingard
> 
> >
> >> 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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