Panic if proc0 hasn't been created and we try to call kthread_create.

This prevents a more mysterious crash later.

XXX The long term solution is defer creation of these things until
XXX proc0 lives

1 files changed, 5 insertions, 0 deletions

diff --git a/sys/kern/kern_kthread.c b/sys/kern/kern_kthread.c
index 5efe90c..1f805e7 100644
--- a/sys/kern/kern_kthread.c
+++ b/sys/kern/kern_kthread.c
@@ -30,6 +30,7 @@
 #include <sys/systm.h>
 #include <sys/proc.h>
 #include <sys/kthread.h>
+#include <sys/resourcevar.h>
 #include <sys/signalvar.h>
 #include <sys/unistd.h>
 #include <sys/wait.h>
@@ -68,6 +69,10 @@ kthread_create(void (*func)(void *), void *arg,
 	va_list ap;
 	struct proc *p2;
 
+	if (!proc0.p_stats || proc0.p_stats->p_start.tv_sec == 0) {
+		panic("kthread_create called too soon");
+	}
+
 	error = fork1(&proc0, RFMEM | RFFDG | RFPROC, &p2);
 	if (error)
 		return error;