[Bug 225450] 11.1-* panics on AMD Opteron 2k due to EARLY_AP_STARTUP

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225450

--- Comment #8 from John Baldwin <jhb at FreeBSD.org> ---
So it looks like the panic is a double fault.  Please try this hack patch to
see if it cleans up the printfs:

Index: amd64/amd64/trap.c
===================================================================
--- amd64/amd64/trap.c  (revision 328557)
+++ amd64/amd64/trap.c  (working copy)
@@ -830,6 +830,11 @@
 void
 dblfault_handler(struct trapframe *frame)
 {
+
+       static int dblflt_lock = 0;
+
+       while (!atomic_cmpset_int(&dblflt_lock, 0, 1))
+               cpu_spinwait();
 #ifdef KDTRACE_HOOKS
        if (dtrace_doubletrap_func != NULL)
                (*dtrace_doubletrap_func)();

It won't fix the panic, but hopefully only one CPU will print out the messages
so we can debug this further.

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