[Bug 237195] pthread_mutex_unlock crash as unlocked mutex destroyed by signaled thread

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237195

--- Comment #13 from longwitz@incore.de ---
OK, thank you for clarification. One bug in my test program was by mistake, an
other for demonstration. With following patch the program works as I have
intended:

--- mypshared.c.orig    2022-08-06 21:13:03.438699000 +0200
+++ mypshared.c 2022-08-08 10:24:26.021928000 +0200
@@ -34,7 +34,7 @@

 pthread_mutexattr_t attr, *attrp = NULL;
 int rc, first, mycounter;
-int init_only_on_first = 0, always_destroy = 1;
+int init_only_on_first = 0, always_destroy = 0;

 pthread_mutex_t magic, *magicp = &magic;

@@ -120,7 +120,7 @@

 void
 start_mutex() {
-   if ( init_only_on_first && first ) {
+   if( !init_only_on_first || first ) {
       rc = pthread_mutex_init((pthread_mutex_t *)&regionp->mutexp, attrp);
       printf("rc of pthread_mutex_init = %d\n", rc);
       if( rc ) exit( rc );

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