[Bug 1864864] Re: [SRU] pthread_rwlock_trywrlock results in hang
Bug Watch Updater
1864864 at bugs.launchpad.net
Mon Mar 30 16:02:24 UTC 2020
** Changed in: glibc (Debian)
Status: Unknown => Fix Released
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https://bugs.launchpad.net/bugs/1864864
Title:
[SRU] pthread_rwlock_trywrlock results in hang
Status in glibc package in Ubuntu:
Fix Released
Status in glibc source package in Bionic:
Triaged
Status in glibc package in Debian:
Fix Released
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]
* 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
trylock_wr
<hangs>
[Regression Potential]
* 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
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