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Date: Sat, 7 Jul 2012 16:02:45 +0700
From: Eugene Grosbein <egrosbein@rdtc.ru>
To: Przemyslaw Frasunek <venglin@freebsd.lublin.pl>
Message-ID: <20120707090245.GA77055@rdtc.ru>
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Cc: freebsd-net@freebsd.org, Mike Tancsa <mike@sentex.net>,
	bzeeb-lists@lists.zabbadoz.net
Subject: Re: mpd5/Netgraph issues after upgrading to 7.4
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On Sat, Jul 07, 2012 at 10:26:46AM +0200, Przemyslaw Frasunek wrote:
> > After reenabling IPv6, the crash occurred within 6 hours. This time, crashdump
> > was properly saved (thanks to patch suggested by Eugene).
> 
> My PPPoE BRAS was stable for 17 days. This morning, it crashed in another way:
> 
> current process         = 2762 (mpd5)
> trap number             = 9
> panic: general protection fault
> cpuid = 5
> KDB: stack backtrace:
> #0 0xffffffff803a04a6 at kdb_backtrace+0x66
> #1 0xffffffff8036dfde at panic+0x1ce
> #2 0xffffffff80503300 at trap_fatal+0x290
> #3 0xffffffff80503851 at trap+0x111
> #4 0xffffffff804ea5d4 at calltrap+0x8
> #5 0xffffffff8041d314 at lltable_prefix_free+0x74
> #6 0xffffffff8044c014 at in_ifscrub+0x2c4
> #7 0xffffffff8044d3f3 at in_control+0x793
> #8 0xffffffff80418d2d at ifioctl+0xccd
> #9 0xffffffff803b6842 at kern_ioctl+0x92
> #10 0xffffffff803b6aa0 at ioctl+0xf0
> #11 0xffffffff80502ab2 at amd64_syscall+0x302
> #12 0xffffffff804ea8cc at Xfast_syscall+0xfc
> Uptime: 17d7h18m38s

Did you set net.isr.direct=0 (and/or direct_force)?
If so, don't do that. Get back to default 1 for these two sysctls.

Eugene Grosbein