linux-kernel - Re: [linux-usb-devel] 2.6.20-rc5: BUG: lock held at task exit time! (pm_mutex){--..}, at: [<c013bfff>] enter

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Message-Id: <200701172128.38545.arvidjaar@mail.ru>
Date:	Wed, 17 Jan 2007 21:28:34 +0300
From:	Andrey Borzenkov <arvidjaar@...l.ru>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	linux-usb-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [linux-usb-devel] 2.6.20-rc5: BUG: lock held at task exit time! (pm_mutex){--..}, at: [<c013bfff>] enter_state+0x3f/0x170

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On Tuesday 16 January 2007 23:31, Alan Stern wrote:
> On Tue, 16 Jan 2007, Andrey Borzenkov wrote:
> > I have Toshiba Portege 4000 that almost always hangs dead resuming from
> > STR. This was better before 2.6.18, since then STR is unusable. Sometimes
> > it manages to resume; yesterday I got on console and in dmesg:
> >
> > =====================================
> > [ BUG: lock held at task exit time! ]
> > - -------------------------------------
> > echo/28793 is exiting with locks still held!
> > 1 lock held by echo/28793:
> >  #0:  (pm_mutex){--..}, at: [<c013bfff>] enter_state+0x3f/0x170
> >
> > stack backtrace:
> >  [<c0103fea>] show_trace_log_lvl+0x1a/0x30
> >  [<c01045f2>] show_trace+0x12/0x20
> >  [<c01046a6>] dump_stack+0x16/0x20
> >  [<c0132377>] debug_check_no_locks_held+0x87/0x90
> >  [<c011c8bb>] do_exit+0x4db/0x820
> >  [<c011cc29>] do_group_exit+0x29/0x70
> >  [<c011cc7f>] sys_exit_group+0xf/0x20
> >  [<c010300e>] sysenter_past_esp+0x5f/0x99
> >  =======================
>
> Have you tried using 2.6.19?  There was a bug which got fixed in that
> release.
>

Yes I did. It had the same problem.

Sorry for posting to wrong list, but I hit USB pm_mutex before other one.

- -andrey
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