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Date:      Wed, 14 Feb 2007 20:14:00 -0500
From:      Kris Kennaway <kris@obsecurity.org>
To:        Alexandre Sunny Kovalenko <alex.kovalenko@verizon.net>
Cc:        current@freebsd.org, Kris Kennaway <kris@obsecurity.org>
Subject:   Re: -CURRENT panics on intensive fs operations.
Message-ID:  <20070215011400.GA10455@xor.obsecurity.org>
In-Reply-To: <1171500531.780.6.camel@RabbitsDen.RabbitsLawn.verizon.net>
References:  <1171414959.906.16.camel@RabbitsDen.RabbitsLawn.verizon.net> <20070214011755.GA73381@xor.obsecurity.org> <1171500531.780.6.camel@RabbitsDen.RabbitsLawn.verizon.net>

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On Wed, Feb 14, 2007 at 07:48:51PM -0500, Alexandre Sunny Kovalenko wrote:
> On Tue, 2007-02-13 at 20:17 -0500, Kris Kennaway wrote:
> > On Tue, Feb 13, 2007 at 08:02:39PM -0500, Alexandre Sunny Kovalenko wrote:
> > > I can reliably panic -CURRENT (Feb 11, noon EST) with the something that
> > > excersises the file system. I have currently settled on (cd /usr/ports;
> > > make clean), but it all started out as doing some "emerges" to test the
> > > latest linuxolator. In the case of the "make clean" I have seen it
> > > crashing as early as /usr/ports/audio and as late
> > > as /usr/ports/textproc. 
> > > 
> > > It does not seem to be consistent as to where it crashes (two latest
> > > ones are below). This machine is Intel T2400 (1.83GHz 32-bit dual core).
> > > I have attached config file to the E-mail. I am going to turn off
> > > PREEMPTION for the lack of better ideas, but I will be happy to try any
> > > other suggestions. I did run memtest on this machine for about 6 hours
> > > without a problem.
> > 
> > How about turning debugging back on to try and catch a more useful
> > panic?
> I don't know whether it is indeed more useful:
> 
> RabbitsDen# kgdb /usr/obj/usr/src/sys/TPX60/kernel.debug vmcore.0
> kgdb: kvm_read: invalid address (0x16)
> [GDB will not be able to debug user-mode
> threads: /usr/lib/libthread_db.so: Undefined symbol "ps_pglobal_lookup"]
> 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 "i386-marcel-freebsd".
> Cannot access memory at address 0x0
> (kgdb) bt
> #0  0x00000000 in ?? ()
> (kgdb) 

kgdb or libkvm out of date?

> Maybe this will help someone:
> RabbitsDen# grep savecore /var/log/messages
> Feb 14 19:35:35 RabbitsDen savecore: reboot after panic: Bad link elm
> 0xc670c3fc prev->next != elm

Not really, it's from <sys/queue.h> does it doesn't give any real
information.

Kris



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