Abort in a WASIX thread causes an exit with exitcode 0

[zebreus]

Describe the bug

Calling the WASIX abort() function (which is just a wrapper around __builtin_trap) from a thread causes the wasmer to exit with code 0. The exitcode should actually be non-zero. Calling __builtin_trap from the main thread works and has a non-zero exit code.

Steps to reproduce

Compile the following code to wasix WASM

#include <stdlib.h>
#include <stdio.h>
#include <assert.h>
#include <errno.h>
#include <pthread.h>

#ifndef NULL
#define NULL ((void*)0)
#endif

void* abort_in_thread(void* arg) {
    // Abnormal termination should never result in exit code 0
    abort();
}

int main() {
    pthread_t thread;
    pthread_create(&thread, NULL, abort_in_thread, NULL);
    pthread_join(thread, NULL);

    return 5;
}

Then run it with wasmer

Expected behavior

Exit with a non-zero exit code

Actual behavior

Exits with exitcode zero

Additional context

Calling abort in the main thread works as intended

[copilot-swe-agent]

Copilot encountered an error and was unable to start working on this issue: The service is temporarily unavailable. Please try again later.

[zebreus]

@copilot try again

[marxin]

Thank you for the investigations (and the initial PR). Feel free to continue working on it, we'll appreciate that.