** Description changed: [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] * Fetch the source program and build it: $ wget https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1864864/+attachment/5333068/+files/bug23844.wr.c $ gcc bug23844.wr.c -lpthread -o bug23844wr * Run the resulting binary a few times. On affected systems, it should hang in less then 10 attempts. $ ./bug23844rw trylock_wr 500000 (...) - $ ./bug23844.wr + $ ./bug23844.wr trylock_wr <hangs> [Regression Potential] - * I don't believe there's a chance for regressions here + * The upstream fix has been in glibc 2.30 and later + * Debian has the fix in 2.28-8 as part of "git-updates.diff" from February 2019
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1864864 Title: [SRU] pthread_rwlock_trywrlock results in hang To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1864864/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
