D9828.id25772.diff
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D9828.id25772.diff
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	Index: sys/dev/vt/vt_core.c
	===================================================================
	--- sys/dev/vt/vt_core.c
	+++ sys/dev/vt/vt_core.c
	@@ -2617,10 +2617,17 @@
	/* Init 25 Hz timer. */
	callout_init_mtx(&vd->vd_timer, &vd->vd_lock, 0);

	- /* Start timer when everything ready. */
	+ /*
	+ * Start timer when everything ready.
	+ * Note that the operations here are purposefully ordered.
	+ * We need to ensure vd_timer_armed is non-zero before we set
	+ * the VDF_ASYNC flag. That prevents this function from
	+ * racing with vt_resume_flush_timer() to update the
	+ * callout structure.
	+ */
	+ atomic_add_acq_int(&vd->vd_timer_armed, 1);
	vd->vd_flags \|= VDF_ASYNC;
	callout_reset(&vd->vd_timer, hz / VT_TIMERFREQ, vt_timer, vd);
	- vd->vd_timer_armed = 1;
	register_handlers = 1;
	}