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From: John Baldwin <jhb@freebsd.org>
To: freebsd-stable@freebsd.org,
 sbruno@freebsd.org
Subject: Re: stable/10 panic
Date: Mon, 5 May 2014 13:48:13 -0400
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On Monday, April 21, 2014 12:31:32 pm Sean Bruno wrote:
> We're seeing this *a lot* on our qmail based hosts during our stable/10
> rollout.  We're running stable/10 from around svn rev 261579 (mid
> february) with one or two patches strewn in.
> 
> sean
> 
> 
> GNU gdb 6.1.1 [FreeBSD]
> Copyright 2004 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and you are
> welcome to change it and/or distribute copies of it under certain conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB.  Type "show warranty" for details.
> This GDB was configured as "amd64-marcel-freebsd"...
> 
> Unread portion of the kernel message buffer:
> panic: page fault
> cpuid = 5
> KDB: stack backtrace:
> db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe048b9b12a0
> kdb_backtrace() at kdb_backtrace+0x39/frame 0xfffffe048b9b1350
> vpanic() at vpanic+0x126/frame 0xfffffe048b9b1390
> panic() at panic+0x43/frame 0xfffffe048b9b13f0
> trap_fatal() at trap_fatal+0x3a2/frame 0xfffffe048b9b1450
> trap_pfault() at trap_pfault+0x22f/frame 0xfffffe048b9b14f0
> trap() at trap+0x670/frame 0xfffffe048b9b1710
> calltrap() at calltrap+0x8/frame 0xfffffe048b9b1710
> --- trap 0xc, rip = 0xffffffff805e759b, rsp = 0xfffffe048b9b17d0, rbp = 0xfffffe048b9b17e0 ---
> __mtx_assert() at __mtx_assert+0x3b/frame 0xfffffe048b9b17e0
> knote() at knote+0x39/frame 0xfffffe048b9b1830
> pipeclose() at pipeclose+0xbe/frame 0xfffffe048b9b1860

Can you show which line this is via kgdb?  Can you also 'p *cpipe'
and 'p *ppipe'?

-- 
John Baldwin