Re: 2.6.35-r5 ext3 corruptions

[Josef Bacik]

On Thu, Jul 15, 2010 at 08:57:45PM +1000, Dave Chinner wrote:
> Upgrading my test vms from 2.6.35-rc3 to 2.6.35-rc5 is resulting in
> repeated errors on the root drive of a test VM:
> 
> { 1532.368808] EXT3-fs error (device sda1): ext3_lookup: deleted inode referenced: 211043
> [ 1532.370859] Aborting journal on device sda1.
> [ 1532.376957] EXT3-fs (sda1): 
> [ 1532.376976] EXT3-fs (sda1): error: ext3_journal_start_sb: Detected aborted journal
> [ 1532.376980] EXT3-fs (sda1): error: remounting filesystem read-only
> [ 1532.420361] error: remounting filesystem read-only
> [ 1532.621209] EXT3-fs error (device sda1): ext3_lookup: deleted inode referenced: 211043
> 
> The filesysetm is a mess when checked on reboot - lots of illegal
> references to blocks, multiply linked blocks, etc, but repairs.
> Files are lots, truncated, etc, so there is visible filesystem
> damage.
> 
> I did lots of testing on 2.6.35-rc3 and came across no problems;
> problems only seemed to start with 2.6.35-rc5, and I've repãoduced
> the problem on a vanilla 2.6.35-rc4.
> 
> The problem seems to occur randomly - sometimes during boot or when
> idle after boot, sometimes a while after boot. I haven't done any
> digging at all for the cause - all I've done so far is confirm that
> it is reproducable and it's not my code causing the problem.
> 

All I see from 2.6.35-rc4 thats changed is some writeback cleanups, nothing that
jumps out at me as being horribly broken.  Could you drop a dump_stack() in that
"deleted inode referenced" message so I can see how we're getting here?  The
other stack trace is just because writeback started on a readonly fs, so it
doesn't necessarily have anything to do with the original problem.  Thanks,

Josef
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