use-after-free on log replay failure

[Dave Chinner]

On Mon, Aug 04, 2014 at 02:00:05PM +0300, Alex Lyakas wrote:
> Greetings,
> 
> we had a log replay failure due to some errors that the underlying
> block device returned:
> [49133.801406] XFS (dm-95): metadata I/O error: block 0x270e8c180
> ("xlog_recover_iodone") error 28 numblks 16
> [49133.802495] XFS (dm-95): log mount/recovery failed: error 28
> [49133.802644] XFS (dm-95): log mount failed

#define ENOSPC          28      /* No space left on device */

You're getting an ENOSPC as a metadata IO error during log recovery?
Thin provisioning problem, perhaps, and the error is occurring on
submission rather than completion? If so:

8d6c121 xfs: fix buffer use after free on IO error

Cheers,

Dave.
-- 
Dave Chinner
david at fromorbit.com