linux-kernel - Re: BUG: sleeping function called from invalid context at kernel/rwsem.c:131 XFS? (was: Re: linux-next: Tree for October 17)

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Date:	Wed, 22 Oct 2008 13:12:22 +0400
From:	"Alexander Beregalov" <a.beregalov@...il.com>
To:	"Dave Chinner" <david@...morbit.com>, lachlan@....com,
	"Christoph Hellwig" <hch@...radead.org>,
	"Arjan van de Ven" <arjan@...radead.org>, xfs@....sgi.com,
	linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: BUG: sleeping function called from invalid context at kernel/rwsem.c:131 XFS? (was: Re: linux-next: Tree for October 17)

2008/10/22 Dave Chinner <david@...morbit.com>:
> On Wed, Oct 22, 2008 at 06:58:38PM +1100, Dave Chinner wrote:
>> On Tue, Oct 21, 2008 at 03:42:16PM +0400, Alexander Beregalov wrote:
>> > Bisected to:
>> > dd509097cb0b76d3836385f80d6b2d6fd3b97757 is first bad commit
>> > commit dd509097cb0b76d3836385f80d6b2d6fd3b97757
>> > Author: Lachlan McIlroy <lachlan@....com>
>> > Date:   Mon Sep 29 14:56:40 2008 +1000
>> >
>> >     [XFS] Unlock inode before calling xfs_idestroy()
>> >
>> >     Lock debugging reported the ilock was being destroyed without being
>> >     unlocked. We don't need to lock the inode until we are going to insert it
>> >     into the radix tree.
>>
>> Ah, OK, I see the problem, though I don't understand why I'm not
>> seeing the might_sleep() triggering all the time given that I always
>> build with:
>>
>> $ grep SLEEP .config
>> CONFIG_DEBUG_SPINLOCK_SLEEP=y
>>
>> Basically the above commit moved xfs_ilock() inside
>> radix_tree_preload()/radix_tree_preload_end(), which means we are
>> taking a rwsem() while we have an elevated preempt count. I'll
>> get a patch out to fix it.
>
> Patch below (against the xfs master/linux-next branch) should fix the
> regression. I've just started QA on it. Can you please check that
> it works for you, Alexander?
>
> Cheers,
>
> Dave.
> --
> Dave Chinner
> david@...morbit.com
>
> XFS: Can't lock inodes in radix tree preload region
>
> When we are inside a radix tree preload region, we cannot
> sleep. Recently we moved the inode locking inside the
> preload region for the inode radix tree. Fix that,
> and fix a missed unlock in another error path in the
> same code at the same time.
>
> Signed-off-by: Dave Chinner <david@...morbit.com>
Tested-by: Alexander Beregalov <a.beregalov@...il.com>

Yes, it fixes the issue. Thanks
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