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Re: BUG: sleeping function called from invalid context at kernel/rwsem.c

To: Alexander Beregalov <a.beregalov@xxxxxxxxx>, lachlan@xxxxxxx, Christoph Hellwig <hch@xxxxxxxxxxxxx>, Arjan van de Ven <arjan@xxxxxxxxxxxxx>, xfs@xxxxxxxxxxx, linux-next@xxxxxxxxxxxxxxx, LKML <linux-kernel@xxxxxxxxxxxxxxx>
Subject: Re: BUG: sleeping function called from invalid context at kernel/rwsem.c:131 XFS? (was: Re: linux-next: Tree for October 17)
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Wed, 22 Oct 2008 06:13:51 -0400
In-reply-to: <20081022082550.GM18495@disturbed>
References: <a4423d670810171013g5bc19c1cm3f7d9c014ee70349@xxxxxxxxxxxxxx> <20081017203710.GA27187@xxxxxxxxxxxxx> <20081017135510.7127c4e7@xxxxxxxxxxxxx> <a4423d670810200758m3cea3841h40988afc8eaf81@xxxxxxxxxxxxxx> <20081020163327.GA15651@xxxxxxxxxxxxx> <a4423d670810201013w6448cb38w402771799cefb5f5@xxxxxxxxxxxxxx> <20081020223549.GA21152@disturbed> <a4423d670810210442y51b62fc2naf6cb649e6b26942@xxxxxxxxxxxxxx> <20081022075838.GK18495@disturbed> <20081022082550.GM18495@disturbed>
User-agent: Mutt/1.5.18 (2008-05-17)
On Wed, Oct 22, 2008 at 07:25:50PM +1100, Dave Chinner wrote:
> > 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.

This really needs a warning.  Then again I don't really understand this
as the point of radix_tree_preload was that we can do the actual
radix-tree under a lock, or not?

Anyway, the patch looks correct to me, including the slightly unrelated
hunk to fix the missing unlock and preload leak.

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