From owner-freebsd-threads@FreeBSD.ORG  Wed Dec 15 18:54:38 2004
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Date: Wed, 15 Dec 2004 20:54:36 +0200
From: Petri Helenius <pete@he.iki.fi>
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Subject: malloc / free and profiling
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Is it a known problem that libpthread with -pg (gprof stuff) does not 
work properly but gets random hangs in malloc / free routines?
(5.3-RELEASE) Same code with gcov or no profiling at all works fine.

Pete