https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225450
--- Comment #16 from John Baldwin <j...@freebsd.org> ---
(In reply to Pablo Ruiz from comment #14)
Thanks, this gives me what I was looking for. We have infinite recursion
because the spin lock code is calling DELAY() which is trying to grab a spin
lock.
One question is why isn't DELAY using the tsc?
Hmm, it seems 'tsc_is_invariant' isn't set. Are these older AMD CPUs?
You can try this as a hack-workaround to verify it fixes the issue, but I need
to think a bit more about what the right fix might be:
Index: x86/x86/delay.c
===================================================================
--- delay.c (revision 329004)
+++ delay.c (working copy)
@@ -72,7 +72,7 @@
func = get_tsc;
mask = ~0u;
} else {
- if (tc->tc_quality <= 0)
+ if (tc->tc_quality <= 0 || n == 1)
return (0);
func = tc->tc_get_timecount;
mask = tc->tc_counter_mask;
--
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