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The new rwlock implementation upstream has seen a series of fixes upstream that need to get corrected before rhel-8.0 GA.

This bug is about the following fix:

Bug 23844 - pthread_rwlock_trywrlock results in hang
https://sourceware.org/bugzilla/show_bug.cgi?id=23844
- Currently under RCA.

This fix should be included in rhel-8.0.0 branch when available.

See also:
"glibc: Fix new rdlock stall."
https://bugzilla.redhat.com/show_bug.cgi?id=1654872

We are targeting this fix for HTB SNAP4. Setting exception? and going to get exception+.

This bug affects the following threading APIs:

* pthread_rwlock_trywrlock
* pthread_rwlock_tryrdlock

These APIs are used by a lot of applications, but it is only a specific use of them that can trigger a hang.

This flaw is close to being a blocker+, but isn't quite, and so I am seeing exception+ for this bug to commit a fix in SNAP4.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2019:3513