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From: Mateusz Guzik <mjg@FreeBSD.org>
Date: Tue, 9 Jun 2020 15:17:23 +0000 (UTC)
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Subject: svn commit: r361967 - head/sys/kern
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Author: mjg
Date: Tue Jun  9 15:17:23 2020
New Revision: 361967
URL: https://svnweb.freebsd.org/changeset/base/361967

Log:
  Assert on pg_jobc state.
  
  Stolen from NetBSD.

Modified:
  head/sys/kern/kern_proc.c

Modified: head/sys/kern/kern_proc.c
==============================================================================
--- head/sys/kern/kern_proc.c	Tue Jun  9 14:20:16 2020	(r361966)
+++ head/sys/kern/kern_proc.c	Tue Jun  9 15:17:23 2020	(r361967)
@@ -751,9 +751,11 @@ pgadjustjobc(struct pgrp *pgrp, int entering)
 {
 
 	PGRP_LOCK(pgrp);
-	if (entering)
+	if (entering) {
+		MPASS(pgrp->pg_jobc >= 0);
 		pgrp->pg_jobc++;
-	else {
+	} else {
+		MPASS(pgrp->pg_jobc > 0);
 		--pgrp->pg_jobc;
 		if (pgrp->pg_jobc == 0)
 			orphanpg(pgrp);