Issue

The upstream bug should be fixed in RHEL9 in order to support migrating from CentOS 7 or RHEL7 to RHEL9 where the underlying condition variable implementation changed to the new scalable version. The upstream bug should be fixed in RHEL8 in order to support migrating from CentOS 7 or RHEL7 to RHEL8 where the underlying condition variable implementation changed to the new scalable version. Upstream the bug is known as: Bug 25847 - pthread_cond_signal failed to wake up pthread_cond_wait due to a bug in undoing stealing https://sourceware.org/bugzilla/show_bug.cgi?id=25847

Release Notes

.The implementation of POSIX thread condition variables in `glibc` to wake waiting threads has been improved <br/> <br/> Previously, a defect in the POSIX thread condition variable implementation could allow a `pthread_signal()` API call to fail to wake a waiting thread. Consequently, a thread could wait indefinitely for a next signal or broadcast. With this bug fix, the implementation of POSIX thread condition variables now includes a sequence-relative algorithm to avoid the missed signal condition and to provide stronger guarantees that waiting threads are woken correctly.

No. of Comments

Resolution

Done-Errata