rdlock stalls indefinitely on an unlocked pthread rwlock

[Mohammed Naser]

I'm reporting this here in order to help track fixing this inside Ubuntu, 18.04 as its' already been fixed upstream:

https://sourceware.org/bugzilla/show_bug.cgi?id=23861

I can confirm that this issue indeed occurs on a Ubuntu 18.04 system *and* it even occurs with the current proposed version of glibc (2.27-3ubuntu1.3). One of the workloads that are frequently crashing by this are Open vSwitch:

https://bugs.launchpad.net/ubuntu/+source/openvswitch/+bug/1839592/comments/18

Would it be possible to add this to Ubuntu? There is already a commit on the 2.27 branch upstream:

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=f6d0e8c36f02b387d33f2cc58c7cb204f201d92e

Thank you

[Mohammed Naser (mnaser)]

Upon checking, it seems that the latest proposed release actually includes a full rebase to 2.27 which has the fix.