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From: Sean Bruno <seanbru@yahoo-inc.com>
To: Kazumaro Aoki <ka@flu.if0.org>
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Date: Tue, 02 Mar 2010 08:11:36 -0800
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Cc: "freebsd-firewire@freebsd.org" <freebsd-firewire@freebsd.org>
Subject: Re: reset with fwcontrol -R
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On Tue, 2010-03-02 at 07:10 -0800, Kazumaro Aoki wrote:
> Hello, members of freebsd-firewire!
> 
> From: Kazumaro Aoki <ka@flu.if0.org>
> Subject: Re: reset with fwcontrol -R
> Date: Sun, 07 Feb 2010 22:09:56 +0900 (JST)
> 
> > In recent month, the system is in good condition, but today morning,
> > system crashed and made a crash dump.
> (snip)
> > # kgdb /boot/kernel/kernel vmcore.1
> (snip)
> > Fatal trap 12: page fault while in kernel mode
> > current process         = 42 (fw0_taskq)
> > panic: page fault
> (snip)
> > (kgdb) bt
> (snip)
> > #7  0xc05f6d87 in fwohci_task_dma (arg=0xc5662000, pending=1)
> >     at /home/usr/src/sys/dev/firewire/fwohci.c:2206
> (snip)
> 
> I met the similar panic twice, after I saw the above message.
> First, the crash dump was unfortunately not made.
> Second, the crash dump was made and kgdb said the same line
> (FreeBSD7.2R) causes the panic.
> 
> Now, I configured the kernel and I used the loadable module of
> firewire.  So, I can easy to modify the module and it enables to add
> to show debug information other than "sysctl debug.firewire_debug=3".
> 
> I noticed lines 2197-2199 are
> #if 0
> 	dump_db(sc, dmach);
> #endif


> Are the information generated by the commented out the lines useful to
> analyze the problem?
> 


I've never used that code, but I think it is more debugging.  If it is
useful for debugging this issue, I can make it a sysctl for debugging.

Sean