Package: libc6-dev
Version: 2.24-11+deb9u1
Severity: important
A minimal program that exercises R/W locks crashes when linked statically:
$ cat test-rwlock.c
#include <pthread.h>
int main() {
pthread_rwlock_t rw;
if (pthread_rwlock_init(&rw, NULL)) return -1;
if (pthread_rwlock_wrlock(&rw)) return -2;
if (pthread_rwlock_unlock(&rw)) return -3;
if (pthread_rwlock_destroy(&rw)) return -4;
return 0;
}
$ cc -pthread -O0 -g test-rwlock.c ; ./a.out ; echo $?
0
$ cc -pthread -static -O0 -g test-rwlock.c ; ./a.out ; echo $?
Illegal instruction
132
Most likely, the problem is not in pthread_rwlock_unlock, but in
pthread_rwlock_wrlock: gdb shows that when the latter returns,
rw.__data.__writer == pid_of_the_process
in the dynamic case, and
rw.__data.__writer == 0
in the static case.
Best regards,
g.
-- System Information:
Debian Release: 9.1
APT prefers stable-debug
APT policy: (500, 'stable-debug'), (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 4.9.0-4-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8),
LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)
Versions of packages libc6-dev:amd64 depends on:
ii libc-dev-bin 2.24-11+deb9u1
ii libc6 2.24-11+deb9u1
ii linux-libc-dev 4.9.51-1
libc6-dev:amd64 recommends no packages.
Versions of packages libc6-dev:amd64 suggests:
ii glibc-doc 2.24-11+deb9u1
ii manpages-dev 4.10-2
-- no debconf information
