[Bug 1864864] [NEW] [SRU] pthread_rwlock_trywrlock results in hang

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[Impact]

 * pthread_rwlock_trywrlock and pthread_rwlock_tryrdlock before glibc
2.30 could hang:
https://sourceware.org/bugzilla/show_bug.cgi?id=23844#c14

 * We are especially able to reproduce the problem with BIND 9.16.x when
--with-pthread-rwlock configure option enabled

 * But the impact is not limited to BIND 9.16, but any multithreaded
application using phtread rwlocks

[Test Case]

 * There's three test cases included in the upstream bugzilla

[Regression Potential]

 * I don't believe there's a chance for regressions here

** Affects: glibc (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
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[SRU] pthread_rwlock_trywrlock results in hang
https://bugs.launchpad.net/bugs/1864864
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