Date: Sat, 16 Aug 2014 19:06:11 -0400 From: Rich Felker <dalias@...c.org> To: musl@...ts.openwall.com Subject: Test case for 'false ownership' of mutex via TID reuse The attached test case exhibits a bug I'm about to fix in musl, and which also exists in glibc, whereby happening to get the same TID as a previous mutex owner who exited with the mutex locked allows the new thread to unlock the mutex. See also: http://austingroupbugs.net/view.php?id=755 Sadly it's rather slow and impractical to add to libc-test. I'm not sure if it's possible to run it in a container with a smaller pid/tid space to get the reuse to happen sooner. It can also have false negatives if some other process claims the tid before it gets reused for a new thread in the test process. Ideas to make the test more practical and reliable would be nice. Rich View attachment "false_ownership_2.c" of type "text/plain" (622 bytes)
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