[llvm-bugs] [Bug 47389] New: AddressSanitizer: Thread limit (4194304 threads) exceeded. Dying.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47389

            Bug ID: 47389
           Summary: AddressSanitizer: Thread limit (4194304 threads)
                    exceeded. Dying.
           Product: compiler-rt
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: asan
          Assignee: unassignedbugs at nondot.org
          Reporter: mvanotti at google.com
                CC: llvm-bugs at lists.llvm.org

We have noticed that the following program makes asan crash after some time:

```
#include <stdlib.h>
#include <pthread.h>

void * null_func(void* args) {
    return NULL;
}

int main(void) {
  for (size_t i = 0; i < 20000000ULL; i++) {
    pthread_t thread;
    pthread_create(&thread, NULL, null_func, NULL);
    pthread_join(thread, NULL);
  }
}
```

Compiling it with `clang -fsanitize=address fortune.c -o fortune -lpthread`

After some time, the program crashes with the following message:
==693500==AddressSanitizer: Thread limit (4194304 threads) exceeded. Dying.

After looking at the code, it seems like ThreadJoin and ThreadDetach and never
called for ASAN, which seems to indicate that the threads might never go into
quarantine.

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