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List:       freebsd-smp
Subject:    Enabling mutex profiling panics the kernel
From:       Arun Sharma <adsharma () sharma-home ! net>
Date:       2003-02-08 6:39:28
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> Submitter-Id:	current-users
> Originator:	Arun Sharma
> Organization:	
> Confidential:	no 
> Synopsis:	Enabling mutex profiling panics the kernel
> Severity:	non-critical
> Priority:	medium
> Category:	kern
> Class:		sw-bug
> Release:	FreeBSD 5.0-CURRENT i386
> Environment:
System: FreeBSD astra.mirabella.net 5.0-CURRENT FreeBSD 5.0-CURRENT #0: Sat Jan 25 \
18:25:49 PST 2003 root@astra.mirabella.net:/usr/src/sys/i386/compile/astra i386

> Description:
	Enabling mutex profiling panics the kernel.

> How-To-Repeat:
	# sysctl debug.mutex.profiling.enable=1
	# sysctl debug.mutex
> Fix:

	The problem is caused by holding the mprof_mtx and calling
	printf, which results in a blockable malloc().


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