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Date: Tue, 22 Jul 2008 15:50:51 -0400
From: Andrew Gallatin <gallatin@cs.duke.edu>
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To: Kostik Belousov <kostikbel@gmail.com>
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Cc: attilio@freebsd.org, freebsd-current@freebsd.org
Subject: Re: reproducible "panic: share->excl"
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Kostik Belousov wrote:
> On Tue, Jul 22, 2008 at 01:15:12PM -0400, Andrew Gallatin wrote:
>> Kostik Belousov wrote:
>>
>>> Essentially, you tried to do the write of the part of the region mmaped
>> >from the file, to the file. The VOP_WRITE() is called with exclusively
>>> locked vnode, while fault handler tried to lock the vnode in shared mode
>>> to page in.
>> Yes, the operations attempted were rather nonsensical, but should
>> not have killed the system.  Thank you for looking into it.
> 
> Why nonsensical ? The operations are legitimate, and kernel must not panic.
> 
> The question still open is whether the patch fixed the issue for you.

Yes, the patch fixes the panic.

Thank you,

Drew