Messages in this thread |  | | Date | Wed, 11 Sep 2002 12:25:07 +0200 | From | Jens Axboe <> | Subject | Re: 2.5 Problem Status Report |
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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
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