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Re: easily reproducible filesystem crash on rebuilding array

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: easily reproducible filesystem crash on rebuilding array
From: Emmanuel Florac <eflorac@xxxxxxxxxxxxxx>
Date: Fri, 19 Dec 2014 12:57:20 +0100
Cc: xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <20141218225843.GB24183@dastard>
Organization: Intellique
References: <20141211123936.1f3d713d@xxxxxxxxxxxxxxxxxxxx> <20141215130715.4dfaaa8e@xxxxxxxxxxxxxxxxxxxx> <20141215132500.13210fdb@xxxxxxxxxxxxxxxxxxxx> <20141215201036.GQ24183@dastard> <20141216123405.111c7ac0@xxxxxxxxxxxxxxxxxxxx> <20141216195815.GB15665@dastard> <20141218164042.15220bf3@xxxxxxxxxxxxxxxxxxxx> <20141218225843.GB24183@dastard>
Le Fri, 19 Dec 2014 09:58:43 +1100 vous écriviez:

> 
> Where's the XFS error output? This is just the output from the
> dump_stack() call in the xfs error message code...

Where is it supposed to display its errors? I thought it to be
in /var/log/messages....

> Still, that's implying a write IO error being reporte din IO
> completion, not a read error, and that's different to the previous
> issue you've reported. It's also indicative of an error coming from
> the storage, not XFS...
>
> Do these problems *only* happen during or after a RAID rebuild?

Only while the rebuild process is running. All works fine afterwards.
 
> > Phase 7 - verify and correct link counts...
> > resetting inode 4294866029 nlinks from 2 to 5
> > resetting inode 150323855504 nlinks from 13 to 12
> > Metadata corruption detected at block 0x10809dc640/0x1000
> > libxfs_writebufr: write verifer failed on bno 0x10809dc640/0x1000
> > Metadata corruption detected at block 0x10809dc640/0x1000
> > libxfs_writebufr: write verifer failed on bno 0x10809dc640/0x1000
> > done
> 
> I'd suggest you should be upgrading xfsprogs, because that's an
> error that shouldn't happen at the end of a repair. If the latest
> version (3.2.2) doesn't fix this problem, then please send me a
> compressed metadump so I can work out what corruption xfs_repair
> isn't fixing properly.

It was 3.2.2 this time. However it seems to have fixe it anyway;
running it a second time displays nothing special.
Is a metadump of a clean filesystem of any use?

-- 
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