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Date: Thu, 10 May 2007 19:13:51 -0600
From: Scott Swanson <scotts@inetz.com>
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To: Kris Kennaway <kris@obsecurity.org>
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Cc: freebsd-stable@freebsd.org
Subject: Re: panic: spin lock held too long (w/ backtrace)
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Kris Kennaway wrote:
> On Thu, May 10, 2007 at 07:00:00PM -0600, Scott Swanson wrote:
> 
>>>> Unread portion of the kernel message buffer:
>>>> spin lock smp rendezvous held by 0xc95a5900 for > 5 seconds
>>> What is thread 0xc95a5900 doing?
>>>
>>> Kris
>>>
>> Is this the best way to determine the action of the thread?
>>
>> Regards;
>> Scott
>>
>> (kgdb) info threads
>>   90 Thread 100123 (PID=18303: bsdtar)  0xc0644f5b in sched_switch
>> (td=0xc95a5900, newtd=0xc92aad80, flags=0) at
>> /usr/src/sys/kern/sched_4bsd.c:973
> 
> Yes, now 'proc 18303' and 'bt'.
> 
> Kris


(kgdb) proc 18303
(kgdb) bt
#0  0xc0644f5b in sched_switch (td=0xc95a5900, newtd=0xc92aad80,
flags=0) at /usr/src/sys/kern/sched_4bsd.c:973
#1  0xeaa6dcb4 in ?? ()
#2  0x00000001 in ?? ()
#3  0x0ee2c000 in ?? ()
#4  0x00000000 in ?? ()
#5  0x00004000 in ?? ()
#6  0x00000000 in ?? ()
#7  0x00000000 in ?? ()
#8  0xc95a5900 in ?? ()
#9  0xeaa6dd30 in ?? ()
#10 0xc081a8fb in syscall (frame=Cannot access memory at address 0x4008
) at /usr/src/sys/i386/i386/trap.c:983
Previous frame inner to this frame (corrupt stack?)
(kgdb)

Thanks,
Scott