Date: Thu, 20 Nov 2003 14:31:23 -0500 (EST) From: John Baldwin <jhb@FreeBSD.org> To: Kris Kennaway <kris@obsecurity.org> Cc: current@FreeBSD.org Subject: RE: spin lock sched lock held by 0xc25a8640 for > 5 seconds Message-ID: <XFMail.20031120143123.jhb@FreeBSD.org> In-Reply-To: <20031120190342.GA87876@xor.obsecurity.org>
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On 20-Nov-2003 Kris Kennaway wrote:
> I updated bento last night, and it panicked after a few hours with:
>
> Fatal trap 12: page fault while in kernel mode
> cpuid = 0; apic id = 01
> fault virtual address = 0xe5
> fault code = supervisor read, page not present
> instruction pointer = 0x8:0xc052e219
> stack pointer = 0x10:0xe00d2c3c
> frame pointer = 0x10:0xe00d2c64
> code segment = base 0x0, limit 0xfffff, type 0x1b
> = DPL 0, pres 1, def32 1, gran 1
> processor eflags = resume, IOPL = 0
> current process = 40 (irq29: sym0)
> spin lock sched lock held by 0xc25a8640 for > 5 seconds
> panic: spin lock held too long
> cpuid = 1;
> Debugger("panic")
>
> Unfortunately it hangs there instead of breaking to DDB.
>
> The instruction pointer is in:
>
> ...
> c052e000 t propagate_priority
> c052e360 T init_turnstiles
> ...
>
> I'm currently rebuilding without WITNESS_SKIPSPIN in case this catches it.
Argh, I didn't catch that you trap 12'd before the sched_lock hang.
Do you have INVARIANTS on? Also, do you possibly have a kernel.debug
around that you could try to figure out what line that IP corresponds to?
--
John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve!" - http://www.FreeBSD.org/
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