[Bug nptl/23844] pthread_rwlock_trywrlock results in hang

["carlos at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=23844

--- Comment #22 from Carlos O'Donell <carlos at redhat dot com> ---
(In reply to Orivej Desh from comment #21)
> We have diagnosed that this bug causes subversion server (svnserve) to hang
> under load [1] in Ubuntu 18.04, which is based on glibc 2.27. We are going
> to ask Ubuntu to package the bugfix. However, could you also release it in
> the release/2.27/master branch (if this is not against your maintenance
> policy — I see the latest commit there was on 2019-07-15) so that other
> distributions that ship glibc 2.27 would have a chance to release the fix
> before hitting the bug?
> 
> [1]
> rwlock_rdlock:
> https://svn.apache.org/viewvc/subversion/tags/1.12.2/subversion/libsvn_subr/
> cache-membuffer.c?view=markup#l836
> rwlock_trywrlock:
> https://svn.apache.org/viewvc/subversion/tags/1.12.2/subversion/libsvn_subr/
> cache-membuffer.c?view=markup#l866

I would expect Adam Conrad (Ubuntu) and Aurelien Jarno (Debian) could work
together to get this backported for you if you ask them nicely. Any fixes on
master are OK for stable branch backports as long as they do not impact ABI/API
and this is the case here, so the backport meets established consensus.

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