From owner-freebsd-acpi@FreeBSD.ORG  Wed Dec  2 18:00:11 2009
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Date: Wed, 2 Dec 2009 18:00:11 GMT
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To: freebsd-acpi@FreeBSD.org
From: Tarick <tungan@ukr.net>
Cc: 
Subject: Re: kern/140979: [acpi] [panic] Kernel panic (fatal trap 12: page
 fault when in kernel mode) on FreeBSD 8.0 with ACPI because of "ec"
 sub-device
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The following reply was made to PR kern/140979; it has been noted by GNATS.

From: Tarick <tungan@ukr.net>
To: Andriy Gapon <avg@icyb.net.ua>
Cc: bug-followup@FreeBSD.org
Subject: Re: kern/140979: [acpi] [panic] Kernel panic (fatal trap 12: page
 fault when in kernel mode) on FreeBSD 8.0 with ACPI because of "ec"
 sub-device
Date: Wed, 02 Dec 2009 19:57:53 +0200

 Done, common panic message, but last line:
 
 [thread pid 0 tid 100000 ]
 Stopped at 0xffffffff801c95a8 = AcpiExReleaseMutex+0x218: movzbi 0x40(%
 rax), %r14d
 db>
 
 If more data are needed from debugger, please tell me so, but I may end
 up sending you movies or jpg.
 
 -----Original Message-----
 From: Andriy Gapon <avg@icyb.net.ua>
 To: Tarick <tungan@ukr.net>
 Cc: bug-followup@FreeBSD.org
 Subject: Re: kern/140979: [acpi] [panic] Kernel panic (fatal trap 12:
 page fault when in kernel mode) on FreeBSD 8.0 with ACPI because of "ec"
 sub-device
 Date: Wed, 02 Dec 2009 08:39:02 +0200
 <cut>
 So this points us to AcpiExReleaseMutex.
 One possible control flow chain is AcpiExReleaseMutex <- AcpiReleaseGlobalLock
 <- EcUnlock.  But it's still not clear what could be wrong.
 
 Would it be possible to recompile your kernel with the following options,
 reproduce the panic and report full panic message?
 
 makeoptions	DEBUG="-O -g"
 options 	DDB
 options 	DDB_NUMSYM
 options 	KDB
 options 	KDB_TRACE
 
 This should enable printing of stack trace on panic.
 Thanks!