Index: kern_resource.c
===================================================================
RCS file: /cvsroot/src/sys/kern/kern_resource.c,v
retrieving revision 1.181
diff -p -u -r1.181 kern_resource.c
--- kern_resource.c     13 May 2018 14:45:23 -0000      1.181
+++ kern_resource.c     14 Mar 2019 00:24:26 -0000
@@ -488,7 +488,7 @@ void
calcru(struct proc *p, struct timeval *up, struct timeval *sp,
    struct timeval *ip, struct timeval *rp)
{
-       uint64_t u, st, ut, it, tot;
+       uint64_t u, st, ut, it, tot, dt;
       struct lwp *l;
       struct bintime tm;
       struct timeval tv;
@@ -549,10 +549,12 @@ calcru(struct proc *p, struct timeval *u
        * which must have increased.
        */
       if (p->p_xutime > ut) {
-               st -= p->p_xutime - ut;
+               dt = p->p_xutime - ut;
+               st -= uimin(dt, st);
               ut = p->p_xutime;
       } else if (p->p_xstime > st) {
-               ut -= p->p_xstime - st;
+               dt = p->p_xstime - st;
+               ut -= uimin(dt, ut);
               st = p->p_xstime;
       }

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