Comment 18 for bug 1839592

I have done some extensive research on this and I am able to confirm that while Bug #1864864 does solve a class of issues, it does not solve the one affecting Open vSwitch, as it does rely on PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP:

https://github.com/openvswitch/ovs/blob/0de1b425962db073ebbaa3ddbde445580afda840/lib/ovs-thread.c#L247-L248

And when running the reproducer here:

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

By doing the following:

```
curl https://sourceware.org/bugzilla/attachment.cgi?id=11382 -o bug23861.c
sed -i 's/do_exit = 0/do_exit(0)/' bug23861.c
g++ bug23861.c -lpthread -o bug23861
for ((x=1;x<100;x++)) ; do echo $x;date;./bug23861 --prefer-writer-nonrecursive;done
```

I will add that in my initial tests of doing this inside a small VM with a Docker container, it did not hang after running for 10-15 minutes, but it immediately hung on a much more powerful machine. I will file a bug to try and get the patch above SRU'd into glibc as well and hopefully that will be the end of it.