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D29132.id.diff
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D29132.id.diff
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diff --git a/sys/x86/x86/tsc.c b/sys/x86/x86/tsc.c
--- a/sys/x86/x86/tsc.c
+++ b/sys/x86/x86/tsc.c
@@ -503,6 +503,14 @@
if ((!smp_tsc && !tsc_is_invariant))
return (-100);
+ /*
+ * Misbehavior of TSC under VirtualBox has been observed. In
+ * particular, threads doing small (~1 second) sleeps may miss their
+ * wakeup and hang around in sleep state, causing hangs on shutdown.
+ */
+ if (vm_guest == VM_GUEST_VBOX)
+ return (0);
+
size = (mp_maxid + 1) * 3;
data = malloc(sizeof(*data) * size * N, M_TEMP, M_WAITOK);
adj = 0;
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D29132: x86: tsc: punish VirtualBox with low priority for TSC
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