| Issue |
144137
|
| Summary |
[tsan] Error message and hang involving signals
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
tavianator
|
The following test program:
```c
#include <errno.h>
#include <signal.h>
#include <stdatomic.h>
#include <sys/wait.h>
#include <unistd.h>
static atomic_int n = 0;
static void handler(int sig, siginfo_t *info, void *context) {
int x = atomic_load_explicit(&n, memory_order_relaxed);
while (!atomic_compare_exchange_weak_explicit(&n, &x, x + 1,
memory_order_acquire, memory_order_relaxed)) {
}
}
int main(void) {
struct sigaction action = {
.sa_sigaction = handler,
.sa_flags = SA_RESTART | SA_SIGINFO,
};
sigemptyset(&action.sa_mask);
sigaction(SIGPIPE, &action, NULL);
pid_t pid = fork();
if (pid > 0) {
usleep(1000);
kill(pid, SIGPIPE);
waitpid(pid, NULL, 0);
} else if (pid == 0) {
while (atomic_load(&n) < 1) {
usleep(1);
}
}
return 0;
}
```
Reliably prints this message and hangs:
```console
$ clang -Wall -fsanitize=thread foo.c -o foo
$ ./fo
ThreadSanitizer: CHECK failed: tsan_interceptors_posix.cpp:2107 "((thr->slot)) != (0)" (0x0, 0x0) (tid=620758)
^C
$ clang --version
clang version 20.1.6
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
```
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