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);
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