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Re: [BUG] XFS: Assertion failed: atomic_read(&pag->pag_ref) == 0, file:

To: xfs@xxxxxxxxxxx
Subject: Re: [BUG] XFS: Assertion failed: atomic_read(&pag->pag_ref) == 0, file: fs/xfs/xfs_mount.c, line: 272
From: Arkadiusz BubaÅa <arkadiusz.bubala@xxxxxxxxxx>
Date: Wed, 22 May 2013 10:11:03 +0200
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <20130521233937.GX29466@dastard>
References: <519B6738.9030603@xxxxxxxxxx> <20130521233937.GX29466@dastard>
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20120613 Icedove/3.0.11
On Tue, May 21, 2013 at 02:23:20PM +0200, Arkadiusz BubaÅa wrote:
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

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
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

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