[Bug 1864864] Re: [SRU] pthread_rwlock_trywrlock results in hang

[Ondřej Surý]

According to upstream, the issue first appeared in 2.26, so only bionic
is affected.

** Bug watch added: Debian Bug tracker #952609
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=952609

** Also affects: glibc (Debian) via
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=952609
   Importance: Unknown
       Status: Unknown

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Title:
  [SRU] pthread_rwlock_trywrlock results in hang

Status in glibc package in Ubuntu:
  New
Status in glibc package in Debian:
  Unknown

Bug description:
  [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

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