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re: kern/45647: kill from ddb broken

The following reply was made to PR kern/45647; it has been noted by GNATS.

From: (YAMAMOTO Takashi)
Subject: re: kern/45647: kill from ddb broken
Date: Fri,  2 Dec 2011 03:27:23 +0000 (UTC)

 > You could probably just mutex_tryenter(&proc_lock) and print a message if 
 > it fails.
 i don't think tryenter is expected to handle cases like this.
 and of course, the mutex is not an only problem.
 IMO we should just close this PR.
 features like this has always been "works only if you are lucky enough".

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