Date: Sat, 11 Sep 2004 12:35:23 -0700 From: John-Mark Gurney <gurney_j@resnet.uoregon.edu> To: Thomas-Martin Seck <tmseck-lists@netcologne.de> Cc: freebsd-current@freebsd.org Subject: Re: RELENG_5: occasional panic on shutdown Message-ID: <20040911193523.GB72089@funkthat.com> In-Reply-To: <20040911185729.GA382@laurel.tmseck.homedns.org> References: <20040911185729.GA382@laurel.tmseck.homedns.org>
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Thomas-Martin Seck wrote this message on Sat, Sep 11, 2004 at 20:57 +0200:
> Once in a while I drop into ddb when I try to shutdown my RELENG_5
> machine from a serial console; please see below.
>
> Is there anything interesting I could do in ddb to diagnose the problem?
>
> $ sudo shutdown -h now
> Shutdown NOW!
> shutdown: [pid 522]
> $
>
> *** FINAL System shutdown message from thomas@current.tmseck.homedns.org ***
> System going down IMMEDIATELY
>
>
> Sep 11 20:50:15 current shutdown: halt by thomas:
>
> System shutdown time has arrived
>
>
> Fatal trap 12: page fault while in kernel mode
> fault virtual address = 0x1c
> fault code = supervisor write, page not present
> instruction pointer = 0x8:0xc04c16cf
> stack pointer = 0x10:0xcc551784
> frame pointer = 0x10:0xcc551790
> code segment = base 0x0, limit 0xfffff, type 0x1b
> = DPL 0, pres 1, def32 1, gran 1
> processor eflags = interrupt enabled, resume, IOPL = 0
> current process = 251 (syslogd)
> [thread 100038]
> Stopped at knote+0x27: cmpxchgl %ecx,0x1c(%edx)
> db>
You forgot the back trace on this, do a: tr from the db prompt...
It is also very useful to find out the line number for the address
that it stopped at.. (knote+0x27)... you can use gdb for this:
gdb kernel.debug
l *knote+0x27
I do have a fix that may fix this, but I can't know if it will until
I get the information above.
--
John-Mark Gurney Voice: +1 415 225 5579
"All that I will do, has been done, All that I have, has not."
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