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Index: head/sys/kern/kern_umtx.c
===================================================================
--- head/sys/kern/kern_umtx.c
+++ head/sys/kern/kern_umtx.c
@@ -2456,7 +2456,8 @@
break;
}
- if (owner == UMUTEX_CONTESTED) {
+ if (rv == 0) {
+ MPASS(owner == UMUTEX_CONTESTED);
rv = suword32(&m->m_ceilings[0], ceiling);
rv1 = suword32(&m->m_owner, UMUTEX_CONTESTED);
error = (rv == 0 && rv1 == 0) ? 0: EFAULT;

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