Ubuntu
glibc package

  1. Bug #1641241
  2. Comment #4

Comment 4 for bug 1641241

Revision history for this message
bugproxy (bugproxy) wrote : Comment bridged from LTC Bugzilla

------- Comment From <email address hidden> 2016-11-15 11:18 EDT-------
Brian,

I highly suspect that this is the same glibc 2.23 bug identified here: https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1640518. We have opened a glibc bugzilla here: https://sourceware.org/bugzilla/show_bug.cgi?id=20822. We have two potential fixes under test.

tl;dr version: The transactional lock elision code has a bug wherein a shared mutex may be written to by thread B after it has been deleted by thread A, thus resulting to a write of two bytes in thread A's stack space. There is a very small window where this can occur.

Try disabling SMT. If the problem goes away, that would be consistent with this being the same bug.

Bill