From: Jens Axboe <axboe@suse.de>
To: Oleg Drokin <green@namesys.com>
Cc: Ingo Molnar <mingo@elte.hu>, Robert Love <rml@tech9.net>,
Thomas Molina <tmolina@cox.net>,
linux-kernel@vger.kernel.org, andre@linux-ide.org
Subject: Re: 2.5 Problem Status Report
Date: Wed, 11 Sep 2002 12:25:07 +0200 [thread overview]
Message-ID: <20020911102507.GA1364@suse.de> (raw)
In-Reply-To: <20020911120551.A937@namesys.com>
On Wed, Sep 11 2002, Oleg Drokin wrote:
> Hello!
>
> On Wed, Sep 11, 2002 at 09:38:25AM +0200, Ingo Molnar wrote:
>
> > > I have preemption disabled.
> > nevertheless please print out preempt_count() in sched.c - since the big
> > IRQ cleanups we use the preemption count even if preemption is disabled.
> > this way we'll know what kind of problem happened - a stuck softirq count,
> > a stuck hardirq count or an underflow?
>
> You was exactly right. preemption count is -1. I inserted chack in
> dec_preempt_count() and here is updated correct stacktrace. Seems
> like ide_unmap_buffer is called with some bogus data or something like
> that. Also I guess the bug is only visible with debug highmem = ON and
> highmem enabled.
ok I see the bug. it's due to the imbalanced nature of ide_map_buffer()
vs ide_unmap_buffer(). i'll cook up a fix right away.
--
Jens Axboe
next prev parent reply other threads:[~2002-09-11 10:20 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-11 2:00 2.5 Problem Status Report Thomas Molina
2002-09-11 2:29 ` William Lee Irwin III
2002-09-11 18:33 ` Thomas Molina
2002-09-11 20:23 ` William Lee Irwin III
2002-09-11 4:00 ` Robert Love
2002-09-11 7:07 ` Oleg Drokin
2002-09-11 7:26 ` Ingo Molnar
2002-09-11 7:28 ` Oleg Drokin
2002-09-11 7:38 ` Ingo Molnar
2002-09-11 8:05 ` Oleg Drokin
2002-09-11 10:25 ` Jens Axboe [this message]
2002-09-11 10:29 ` Jens Axboe
2002-09-11 10:47 ` Oleg Drokin
2002-09-11 10:58 ` Jens Axboe
2002-09-11 11:07 ` Jens Axboe
2002-09-11 11:16 ` Oleg Drokin
2002-09-11 11:17 ` Jens Axboe
2002-09-11 11:49 ` Jens Axboe
2002-09-11 12:10 ` Oleg Drokin
2002-09-11 15:38 ` Oleg Drokin
2002-09-11 15:46 ` Ingo Molnar
2002-09-11 15:52 ` Ingo Molnar
2002-09-11 17:49 ` Oleg Drokin
2002-09-11 8:07 ` Thomas Molina
2002-09-11 8:12 ` Oleg Drokin
2002-09-11 9:18 ` Adrian Bunk
2002-09-11 7:12 ` Ingo Molnar
2002-09-11 8:04 ` Axel Siebenwirth
2002-09-11 9:21 ` Clemens Schwaighofer
-- strict thread matches above, loose matches on Subject: below --
2002-08-25 11:21 Thomas Molina
2002-08-26 16:42 ` Greg KH
2002-08-26 21:32 ` Thomas Molina
2002-08-02 2:39 2.5 Problem Status report Thomas Molina
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