From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Robboy, David G" Date: Wed, 27 Jun 2001 18:06:12 +0000 Subject: [Linux-ia64] pthread_mutex_lock sometimes fails on Linux 2.4.5 Message-Id: List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org On a 4P Lion with Red Hat 7.0.98 installed and a 2.4.5 kernel, a 4P fft application sometimes hangs in a barrier. All 4 threads get into the barrier and none get out because a count gets up to 3 and they are waiting for it to get to 4. I changed my barrier code to use an assembly language lock instead of pthread_mutex_lock(), and it works reliably now. Either there is a bug in pthread_mutex_lock, or else a memory management bug in the kernel. I've worked around this and it is not causing me a problem now. If anyone wants to investigate and debug this, I'll be glad to supply a test case. David Robboy