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Date: Fri, 10 Sep 2010 20:30:14 +0300
From: Andriy Gapon <avg@icyb.net.ua>
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Cc: freebsd-fs@freebsd.org, Alexander Motin <mav@freebsd.org>
Subject: Re: ZFS related kernel panic
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on 10/09/2010 19:39 a.smith@ukgrid.net said the following:
> Quoting Jeremy Chadwick <freebsd@jdc.parodius.com>:
> 
>> When the panic happens, you will be dropped to a db> prompt at the
>> console.  You should type "trace" to get a backtrace at that point.
>>
> 
> ok, I have successfully got to the db> prompt, here is the output of trace:
> 
> 
> Tracing pid 12 tid 100024 td 0xffffff0001667000
> siis_end_transaction() at siis_end_transaction+0x45
> siis_ch_intr() at siis_ch_intr+0x70
> siis_ch_intr_locked() at siis_ch_intr_locked+0x3e
> siis_intr() at siis_intr+0x61
> intr_event_exectute_handlers() at intr_event_execute_handlers+0xfd
> ithread_loop() at fork_exit+0x118
> fork_exit() at fork_exit+0x118
> fork_trampoline() at fork_trampoline+0xe
> --- trap 0, rip = 0, rsp = 0xffffff80000a5d30, rbp = 0 ---

That's useful information I think.
For completeness you might also run kgdb and then do:
(kgdb) info line *siis_end_transaction+0x45
and so on for all stack trace lines involving siis.
Thanks.

-- 
Andriy Gapon