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Date: Wed, 6 Nov 2013 09:28:18 -0600
From: Eric van Gyzen <eric@vangyzen.net>
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To: Matt Magoffin <matt@msqr.us>
Subject: Re: 9.2-RELEASE amd64 panic: vn_open_cred
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Cc: Konstantin Belousov <kostikbel@gmail.com>, freebsd-stable@freebsd.org
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On 11/06/2013 03:14, Matt Magoffin wrote:
> On Nov 6, 2013, at 4:53 PM, Konstantin Belousov <kostikbel@gmail.com> wrote:
>
>>>> At least, look up the source line number for the VOP_ADD_WRITECOUNT_APV+0x78,
>>>> by loading the kernel.debug into kgdb and doing
>>>> list *VOP_ADD_WRITECOUNT_APV+0x78
>>>> The lines should be from the build-time generated file vnode_if.c, so please
>>>> provide the excerpt from the source file around the reported line.
>>> I am running a GENERIC amd64 kernel, which I have not compiled. Is there a way to deduce the appropriate line without a dump? Or, would I need to trigger a panic in another machine running the same kernel?
>>>
>> The system comes with kernel.symbols file, which should be enough.
>> You do not need a core to do what I requested.
> Is it possible to answer your question on a different machine, as I am not able to bring the system in question down for some time now. I am not clear on exactly how I can perform what you have requested.

Just do:

$ kgdb /boot/kernel/kernel
(kgdb) list *VOP_ADD_WRITECOUNT_APV+0x78

You don't need to bring the system down.  This will have no effect on
the running system.  It's just reading information from the kernel file
and kernel.symbols file.

Eric