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Date: Tue, 10 Aug 2004 10:58:49 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Lee Revell <rlrevell@joe-job.com>
Cc: Florian Schmidt <mista.tapas@gmx.net>,
       linux-kernel <linux-kernel@vger.kernel.org>,
       Felipe Alfaro Solana <felipe_alfaro@linuxmail.org>
Subject: Re: [patch] voluntary-preempt-2.6.8-rc3-O4
Message-ID: <20040810085849.GC26081@elte.hu>
References: <20040726083537.GA24948@elte.hu> <1090832436.6936.105.camel@mindpipe> <20040726124059.GA14005@elte.hu> <20040726204720.GA26561@elte.hu> <20040729222657.GA10449@elte.hu> <20040801193043.GA20277@elte.hu> <20040809104649.GA13299@elte.hu> <20040809130558.GA17725@elte.hu> <20040809190201.64dab6ea@mango.fruits.de> <1092103522.761.2.camel@mindpipe>
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* Lee Revell <rlrevell@joe-job.com> wrote:

>  [<c01062d8>] common_interrupt+0x18/0x20
>  [<c013e2ee>] do_anonymous_page+0x7e/0x190
>  [<c013e44e>] do_no_page+0x4e/0x310
>  [<c013e8d1>] handle_mm_fault+0xc1/0x170
>  [<c013d2a0>] get_user_pages+0x130/0x3b0
>  [<c013ea28>] make_pages_present+0x68/0x90
>  [<c01401d8>] do_mmap_pgoff+0x3f8/0x640
>  [<c010b656>] sys_mmap2+0x76/0xb0
>  [<c01060b7>] syscall_call+0x7/0xb

another idea: you are running this on a C3, using CONFIG_MCYRIXIII,
correct? That is one of the rare configs that triggers X86_USE_3DNOW and
MMX ops. If 3dnow is in any way handicapped in that CPU then that could
cause trouble. Could you compile for e.g. CONFIG_M586TSC? [that option
should be fully compatible with a C3.] - this will exclude the MMX page
clearing ops.

what makes me suspicious is this entry in your call-trace:

>  [<c013e2ee>] do_anonymous_page+0x7e/0x190

this is the next instruction after:

   call   c01d1910 <mmx_clear_page>

but it's all a bit weird - the ALSA interrupt should have hit the
fast_clear_page() function but it didnt. Maybe it doesnt show up because
the call to fast_clear_page() within mmx_clear_page() is tail-optimized
and possibly the stack entry is lost. But still ...

	Ingo