Crash when timeout finishes

[mfikes]

It appears that the creation of the number on timeout is causing a crash:

  thread #115, stop reason = signal SIGSTOP
    frame #0: 0x00007fff4d7e9693 JavaScriptCore`WTFCrashWithInfo(int, char const*, char const*, int) + 19
    frame #1: 0x00007fff4d64ba57 JavaScriptCore`JSC::JSLockHolder::~JSLockHolder() + 311
    frame #2: 0x00007fff4d75cb56 JavaScriptCore`JSValueMakeNumber + 150
    frame #3: 0x0000000100d47354 planck`do_run_timeout(data=0x00007fa4b8034020) at functions.c:1264:15
    frame #4: 0x0000000100d555b3 planck`timer_thread(data=0x00007fa4b80e0880) at timers.c:35:5
    frame #5: 0x00007fff764ca2eb libsystem_pthread.dylib`_pthread_body + 126
    frame #6: 0x00007fff764cd249 libsystem_pthread.dylib`_pthread_start + 66
    frame #7: 0x00007fff764c940d libsystem_pthread.dylib`thread_start + 13

[mfikes]

This reproduces with leonoel/missionary@02325aa and when running the following in that repo:

clojure -Acljs-test -x planck

In that case you will see that the underlying planck process dies early.

[mfikes]

Note, to diagnose this on macOS involved

ulimit -c unlimited

Then causing the repro, which produces a core in /cores.

Then you can use lldb ...path/to/planck -c /cores/<corename and then bt all to see all of the stacktraces.