Re: [BUG] XFS: Assertion failed: atomic_read(&pag->pag_ref) == 0, file: fs/xfs/xfs_mount.c, line: 272

[Arkadiusz BubaÅa <arkadiusz.bubala@xxxxxxxxxx>]

Hello,
> On Tue, May 21, 2013 at 02:23:20PM +0200, Arkadiusz BubaÅa wrote:
>    
> > Hello,
> > I've got a call trace which should be fixed by "drop buffer io
> > reference when a bad bio is built" patch
> > (http://patchwork.xfs.org/patch/3956/). Error occured on already
> > patched Linux kernel 3.2.42.
> >      
> That's an old kernel. Can you reproduce on a current TOT kernel?
> It's entirely possible that this problem has been fixed as we
> definitely mae some changes to the mount error handling path since
> 3.2....
>
>    
Ok. I'll try.
> > Test environment consist two machines target and initiator.
> > First machine works as target with QLogic Corp. ISP2432-based 4Gb
> > Fibre Channel device. Storage is placed on two KINGSTON SNV425S SSD
> > working as RAID0 array. RAID is managed by LSI MegaRAID SAS 1068
> > controller.
> > Second machine works as initiator with the same QLogic card.
> >
> > After few days of running test script I got following call trace and
> > XFS stopped working.
> >      
> Can you narrow this down from "takes several days" to the simplest
> possible reproducer? It happened due to IO errors during mount, so
> maybe you can did that part out of your script and give us a test
> case that reproduces on the first mount?
>
>    
I 'll try. This errors occurs only on heavy load.
Is there any possibility to simulate I/O errors on XFS filesystem?

--
Best regards
Arkadiusz BubaÅa