linux-kernel - Re: [2.6.20] BUG: workqueue leaked lock

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Message-Id: <20070315110628.8bd2c07b.akpm@linux-foundation.org>
Date:	Thu, 15 Mar 2007 11:06:28 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Folkert van Heusden <folkert@...heusden.com>
Cc:	linux-kernel@...r.kernel.org, Oleg Nesterov <oleg@...sign.ru>,
	Neil Brown <neilb@...e.de>
Subject: Re: [2.6.20] BUG: workqueue leaked lock

> On Tue, 13 Mar 2007 17:50:14 +0100 Folkert van Heusden <folkert@...heusden.com> wrote:
> ...
> [ 1756.728209] BUG: workqueue leaked lock or atomic: nfsd4/0x00000000/3577
> [ 1756.728271]     last function: laundromat_main+0x0/0x69 [nfsd]
> [ 1756.728392] 2 locks held by nfsd4/3577:
> [ 1756.728435]  #0:  (client_mutex){--..}, at: [<c1205b88>] mutex_lock+0x8/0xa
> [ 1756.728679]  #1:  (&inode->i_mutex){--..}, at: [<c1205b88>] mutex_lock+0x8/0xa
> [ 1756.728923]  [<c1003d57>] show_trace_log_lvl+0x1a/0x30
> [ 1756.729015]  [<c1003d7f>] show_trace+0x12/0x14
> [ 1756.729103]  [<c1003e79>] dump_stack+0x16/0x18
> [ 1756.729187]  [<c102c2e8>] run_workqueue+0x167/0x170
> [ 1756.729276]  [<c102c437>] worker_thread+0x146/0x165
> [ 1756.729368]  [<c102f797>] kthread+0x97/0xc4
> [ 1756.729456]  [<c1003bdb>] kernel_thread_helper+0x7/0x10
> [ 1756.729547]  =======================
> [ 1792.436492] svc: unknown version (0 for prog 100003, nfsd)
> [ 1846.683648] BUG: workqueue leaked lock or atomic: nfsd4/0x00000000/3577
> [ 1846.683701]     last function: laundromat_main+0x0/0x69 [nfsd]
> [ 1846.683832] 2 locks held by nfsd4/3577:
> [ 1846.683885]  #0:  (client_mutex){--..}, at: [<c1205b88>] mutex_lock+0x8/0xa
> [ 1846.683980]  #1:  (&inode->i_mutex){--..}, at: [<c1205b88>] mutex_lock+0x8/0xa
> [ 1846.683988]  [<c1003d57>] show_trace_log_lvl+0x1a/0x30
> [ 1846.683994]  [<c1003d7f>] show_trace+0x12/0x14
> [ 1846.683997]  [<c1003e79>] dump_stack+0x16/0x18
> [ 1846.684001]  [<c102c2e8>] run_workqueue+0x167/0x170
> [ 1846.684006]  [<c102c437>] worker_thread+0x146/0x165
> [ 1846.684012]  [<c102f797>] kthread+0x97/0xc4
> [ 1846.684023]  [<c1003bdb>] kernel_thread_helper+0x7/0x10

Oleg, that's a fairly incomprehensible message we have in there.  Can you
please explain what it means?
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