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Date: Tue, 22 Jul 2008 13:15:12 -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:

> 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.

Drew