Re: kern/56414: cmake hang on kqueue (condvar waiter list issue) ?

[Taylor R Campbell <riastradh%NetBSD.org@localhost>]

The following reply was made to PR kern/56414; it has been noted by GNATS.

From: Taylor R Campbell <riastradh%NetBSD.org@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: 
Subject: Re: kern/56414: cmake hang on kqueue (condvar waiter list issue) ?
Date: Thu, 14 Apr 2022 14:40:00 +0000

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 I reduced the guile/boehm-gc hang, at least, to the following
 reproducer -- it reliably hangs for me after a few hundred runs, with
 libpthread from netbsd-9 or HEAD and a netbsd-9 kernel, but others
 have reported hangs on recent all-HEAD components.  Condvars are not
 involved; unclear if it's the same issue as cmake.
 
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 #include <err.h>
 #include <pthread.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
 static void *
 start(void *cookie)
 {
 
 	return malloc(12);
 }
 
 int
 main(void)
 {
 	pthread_t t[24];
 	unsigned i;
 	int error;
 
 	for (i =3D 0; i < __arraycount(t); i++) {
 		error =3D pthread_create(&t[i], NULL, &start, NULL);
 		if (error)
 			errc(1, error, "pthread_create");
 	}
 	for (i =3D 0; i < __arraycount(t); i++) {
 		error =3D pthread_join(t[i], NULL);
 		if (error)
 			errc(1, error, "pthread_join");
 	}
 	return 0;
 }
 
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