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Date: Sun, 30 Mar 2003 19:12:57 +0200
From: Petr Vandrovec <vandrove@vc.cvut.cz>
To: Shawn Starr <spstarr@sh0n.net>
Cc: Andrew Morton <akpm@digeo.com>, rml@tech9.net,
       linux-kernel@vger.kernel.org
Subject: Re: [OOPS][2.5.66bk3+] run_timer_softirq - IRQ Mishandlings - New OOPS w/ timer
Message-ID: <20030330171257.GC26557@vana.vc.cvut.cz>
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On Sun, Mar 30, 2003 at 11:10:48AM -0500, Shawn Starr wrote:
> Function found was: delayed_work_timer_fn (kernel/workqueue.c)
> 
> free of pending timer at c7411150
> function=c0138ba0
> Call Trace:
>  [<c014d4b4>] timer_hunt+0x84/0x90
>  [<c0138ba0>] delayed_work_timer_fn+0x0/0x170
>  [<c014fb08>] kfree+0x1c8/0x320
>  [<c024f8a6>] release_dev+0x696/0x840
>  [<c024f8a6>] release_dev+0x696/0x840

drivers/char/tty_io.c schedules flush_to_ldisc work. This
work can potentially reschedule itself, making call to
flush_scheduled_work() at the end of release_dev()
useless :-( 

Unfortunately I have no idea what is that code trying to do -
we already did tty->ldisc.close() and replaced
tty->ldisc with something else when we call flush_scheduled_work(),
so I doubt that work we are waiting for can do anything
useful even if TTY_DONT_FLIP is not set...
					Petr Vandrovec
					vandrove@vc.cvut.cz

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