Date: Sat, 04 Sep 2004 00:16:14 +0400 From: Maxim Maximov <mcsi@mcsi.pp.ru> To: John Baldwin <jhb@FreeBSD.org> Cc: Nate Lawson <nate@root.org> Subject: Re: panic on shutdown Message-ID: <4138D10E.4060809@mcsi.pp.ru> In-Reply-To: <200409031341.47074.jhb@FreeBSD.org> References: <4137EA5C.30606@mcsi.pp.ru> <4138A524.8080107@root.org> <4138A806.9020105@mcsi.pp.ru> <200409031341.47074.jhb@FreeBSD.org>
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John Baldwin wrote:
> On Friday 03 September 2004 01:21 pm, Maxim Maximov wrote:
>
>>Nate Lawson wrote:
>>
>>>John Baldwin wrote:
>>>
>>>>On Thursday 02 September 2004 11:51 pm, Maxim Maximov wrote:
>>>>
>>>>>Hello.
>>>>>
>>>>> I just got this panic on shutdown using Power button, hand
>>>>>transcribed:
>>>>>
>>>>>Syncing disks: <numbers>
>>>>>No buffers busy after final sync
>>>>>Uptime: 21m53s
>>>>>Powering system off using ACPI
>>>>>
>>>>>panic: lock (sleep mutex) Giant not locked @
>>>>>/usr/src/sys/kern/kern_timeout.c:279
>>>>>
>>>>>cpuid = 0
>>>>>KDB: enter: panic
>>>>>ACPI power-off failed - timeout
>>>>>
>>>>>Rebooting...
>>>>>cpu_reset: called on cpu#1
>>>>>cpu_reset: Stopping other CPUs
>>>>>
>>>>>Here it hung until I pressed Power button again. Then it shut down.
>>>>
>>>>Looks like the timeout/callout routine dropped Giant more than it
>>>>acquired it.
>>>
>>>I don't see how this could be triggered by ACPI. If you reboot the
>>>system with ACPI disabled (or enabled), do you also get this message?
>>
>>My system can't boot with ACPI disabled.
>>
>>Also I want to mention that this panic is rare. I've seen it about 10
>>times in 2-3 months of everyday rebooting.
>>
>>And by the way, the command issued to shut the system down was 'halt -p'
>
>
> I would hack the timeout code to add some printf's before the
> mtx_unlock(&Giant) to dump the function pointer and argument
> if !tmtx_owned(&Giant) and then use gdb to figure out what the callout
> function was. I.e. something like:
>
> if (not mpsafe) {
> if (!mtx_owned(&Giant))
> printf("func = %p, arg = %p\n", c_func, c_arg)
> mtx_unlock(&Giant);
> }
>
Thanks, I recompiled kernel with this code. I'll let you know if this
yields anything..
--
Maxim Maximov
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