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D5436.diff

Index: head/sys/dev/hyperv/vmbus/hv_vmbus_drv_freebsd.c
===================================================================
--- head/sys/dev/hyperv/vmbus/hv_vmbus_drv_freebsd.c
+++ head/sys/dev/hyperv/vmbus/hv_vmbus_drv_freebsd.c
@@ -117,7 +117,7 @@
* not deliver any more messages
* since there is no empty slot
*/
- wmb();
+ atomic_thread_fence_seq_cst();
if (msg->header.message_flags.u.message_pending) {
/*
@@ -187,7 +187,7 @@
* not deliver any more messages
* since there is no empty slot
*/
- wmb();
+ atomic_thread_fence_seq_cst();
if (msg->header.message_flags.u.message_pending) {
/*

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