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Date:      Tue, 2 Mar 1999 17:28:13 -0600
From:      Alan Cox <alc@cs.rice.edu>
To:        Brian Feldman <green@unixhelp.org>
Cc:        current@freebsd.org
Subject:   Re: lockmgr panic with mmap()
Message-ID:  <19990302172813.A91146@nonpc.cs.rice.edu>
In-Reply-To: <Pine.BSF.4.05.9903021816130.9317-100000@janus.syracuse.net>; from Brian Feldman on Tue, Mar 02, 1999 at 06:16:50PM -0500
References:  <19990302113704.B90473@nonpc.cs.rice.edu> <Pine.BSF.4.05.9903021816130.9317-100000@janus.syracuse.net>

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On Tue, Mar 02, 1999 at 06:16:50PM -0500, Brian Feldman wrote:
> 
> Where exactly does thrd_sleep come in, since that's where the program locks
> up now? Can't be killed, of course...
> 

The lock manager isn't bright enough to detect that the process
already holds a read lock when it attempts to get the write lock.
Thus, you get the "thrd_sleep" instead of a panic.

In short, same bug, different symptoms.


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