Bionic verification
First, reproducing the bug with the current glibc:
ubuntu@bionic-glibc-1864864:~$ apt-cache policy libc6
libc6:
Installed: 2.27-3ubuntu1.2
Candidate: 2.27-3ubuntu1.2
Version table:
*** 2.27-3ubuntu1.2 500
500 http://br.archive.ubuntu.com/ubuntu bionic-updates/main amd64
Packages
500 http://br.archive.ubuntu.com/ubuntu bionic-security/main amd64
Packages
100 /var/lib/dpkg/status
It hung immediately:
ubuntu@bionic-glibc-1864864:~$ ./bug23844wr
trylock_wr
(stuck)
Second run worked, third run got stuck again:
ubuntu@bionic-glibc-1864864:~$ ./bug23844wr
trylock_wr
500000
ubuntu@bionic-glibc-1864864:~$ ./bug23844wr
trylock_wr
(stuck)
With updated glibc:
ubuntu@bionic-glibc-1864864:~$ apt-cache policy libc6
libc6:
Installed: 2.27-3ubuntu1.3
Candidate: 2.27-3ubuntu1.3
Version table:
*** 2.27-3ubuntu1.3 500
500 http://br.archive.ubuntu.com/ubuntu bionic-proposed/main amd64
Packages
100 /var/lib/dpkg/status
Sample program doesn't hang anymore, after multiple tries, and no need to
rebuild it:
ubuntu@bionic-glibc-1864864:~$ ./bug23844wr
trylock_wr
500000
ubuntu@bionic-glibc-1864864:~$ ./bug23844wr
trylock_wr
500000
ubuntu@bionic-glibc-1864864:~$ ./bug23844wr
trylock_wr
500000
ubuntu@bionic-glibc-1864864:~$ ./bug23844wr
trylock_wr
500000
ubuntu@bionic-glibc-1864864:~$ ./bug23844wr
trylock_wr
500000
ubuntu@bionic-glibc-1864864:~$ ./bug23844wr
trylock_wr
500000
ubuntu@bionic-glibc-1864864:~$ ./bug23844wr
trylock_wr
500000
bionic verification succeeded
** Tags removed: verification-needed-bionic
** Tags added: verification-done-bionic
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https://bugs.launchpad.net/bugs/1864864
Title:
[SRU] pthread_rwlock_trywrlock results in hang
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