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Subject: Re: [PATCH] BUG(): sched.c: Line 944
From: Robert Love <rml@tech9.net>
To: Steven Cole <elenstev@mesatop.com>
Cc: Ingo Molnar <mingo@elte.hu>, Linus Torvalds <torvalds@transmeta.com>,
       Linux Kernel <linux-kernel@vger.kernel.org>
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On Tue, 2002-09-17 at 15:54, Steven Cole wrote:

Thank you for the testing, Steven.

> Running dbench 3 resulted in the dbench clients hanging and being
> unkillable with kill -9 in the D state.

Hrm, I cannot reproduce this.  I just successfully completed a `dbench
16'.  Can you find where they are hanging?  You can get a trace via
sysrq.  You can also see where they are in the kernel via the wchan
field of ps: "ps -ewo user,pid,priority,%cpu,stat,command,wchan" is a
favorite of mine.

Sure it does not happen with a stock kernel (no preempt)?

What if you replace the printk() and dump_stack() in schedule() with a
no-op (but not something that will optimize away the conditional, i.e.
try a cpu_relax()).

Oh, is the previous patch fully backed out?  None of that do_exit muck
anymore, right?

> Test box is 2-way pIII, kernel SMP.

I too am SMP with kernel preemption, dual Athlon MP.

Regards,

	Robert Love

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