linux-kernel - Re: 2.6.24-rc2-mm1: kcryptd vs lockdep

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Message-ID: <4741F97D.6090808@redhat.com>
Date:	Mon, 19 Nov 2007 22:00:45 +0100
From:	Milan Broz <mbroz@...hat.com>
To:	Torsten Kaiser <just.for.lkml@...glemail.com>
CC:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Alasdair G Kergon <agk@...hat.com>
Subject: Re: 2.6.24-rc2-mm1: kcryptd vs lockdep

Torsten Kaiser wrote:
> On Nov 19, 2007 8:56 AM, Ingo Molnar <mingo@...e.hu> wrote:
>> * Torsten Kaiser <just.for.lkml@...glemail.com> wrote:
...
> Above this acquire/release sequence is the following comment:
> #ifdef CONFIG_LOCKDEP
>                 /*
>                  * It is permissible to free the struct work_struct
>                  * from inside the function that is called from it,
>                  * this we need to take into account for lockdep too.
>                  * To avoid bogus "held lock freed" warnings as well
>                  * as problems when looking into work->lockdep_map,
>                  * make a copy and use that here.
>                  */
>                 struct lockdep_map lockdep_map = work->lockdep_map;
> #endif
> 
> Did something trigger this anyway?
> 
> Anything I could try, apart from more boots with slub_debug=F?

Please could you try which patch from the dm-crypt series cause this ?
(agk-dm-dm-crypt* names.)

I suspect agk-dm-dm-crypt-move-bio-submission-to-thread.patch because
there is one work struct used subsequently in two threads...
(io thread already started while crypt thread is processing lockdep_map
after calling f(work)...)

(btw these patches prepare dm-crypt for next patchset introducing 
async cryptoapi, so there should be no functional changes yet.)

Milan
--
mbroz@...hat.com


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