[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 #18 from Pablo Ruiz <pablo.ruiz at gmail.com> ---
I've tried the following patch:

diff --git a/sys/x86/x86/delay.c b/sys/x86/x86/delay.c
index 8cbe6012a96..00dfff48c19 100644
--- a/sys/x86/x86/delay.c
+++ b/sys/x86/x86/delay.c
@@ -70,7 +70,7 @@ delay_tc(int n)
                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;
diff --git a/sys/x86/x86/mp_x86.c b/sys/x86/x86/mp_x86.c
index 04975dd8a2e..c2a90e9a7d4 100644
--- a/sys/x86/x86/mp_x86.c
+++ b/sys/x86/x86/mp_x86.c
@@ -952,7 +952,7 @@ init_secondary_tail(void)
 #endif

        mtx_unlock_spin(&ap_boot_mtx);
-while(1);
+//while(1);

        /* Wait until all the AP's are up. */
        while (atomic_load_acq_int(&smp_started) == 0)

.....

But I got to 'db' prompt to:

cpu0 BSP:
     ID: 0x00000000   VER: 0x80050010 LDR: 0x00000000 DFR: 0xffffffff
  lint0: 0x00010700 lint1: 0x00000400 TPR: 0x00000000 SVR: 0x000001ff
  timer: 0x000100ef therm: 0x00010000 err: 0x000000f0 pmc: 0x00010400
   AMD ext features: 0x00010003
   AMD elvt0: 0x00010000
SMP: AP CPU #1 Launched!
cpu1 AP:


FFa
tFa

FFa

FFa
Fa
kFernel trap 12 with interrupts disabled


Fatal trap 12: page fault while in kernel mode
cpuid = 2; apic id = 02
fault virtual address   = 0x441
fault code              = supervisor read data, page not present
instruction pointer     = 0x20:0xffffffff80ffb704
stack pointer           = 0x28:0xfffffe001b97ba90
frame pointer           = 0x28:0xfffffe001b97baa0
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = resume, IOPL = 0
current process         = 11 (idle: cpu2)
[ thread pid 11 tid 100005 ]
Stopped at      spinlock_exit+0x14:     movq    0x440(%rbx),%rax
db> show thread
Thread 100005 at 0xfffff8000332c000:
 proc (pid 11): 0xfffff80003328000
 name: idle: cpu2
 stack: 0xfffffe001b9a6000-0xfffffe001b9a9fff
 flags: 0x40024  pflags: 0x200000
 state: CAN RUN
 priority: 255
 container lock: sched lock 0 (0xffffffff827ee880)
db> bt
Tracing pid 11 tid 100005 td 0xfffff8000332c000
spinlock_exit() at spinlock_exit+0x14/frame 0xfffffe001b97baa0
_mtx_lock_spin_cookie() at _mtx_lock_spin_cookie+0xa5/frame 0xfffffe001b97bb10
i8254_delay() at i8254_delay+0x143/frame 0xfffffe001b97bb50
_mtx_lock_spin_cookie() at _mtx_lock_spin_cookie+0xa5/frame 0xfffffe001b97bbc0
i8254_delay() at i8254_delay+0x143/frame 0xfffffe001b97bc00
_mtx_lock_spin_cookie() at _mtx_lock_spin_cookie+0xa5/frame 0xfffffe001b97bc70
i8254_delay() at i8254_delay+0x143/frame 0xfffffe001b97bcb0
_mtx_lock_spin_cookie() at _mtx_lock_spin_cookie+0xa5/frame 0xfffffe001b97bd20
i8254_delay() at i8254_delay+0x143/frame 0xfffffe001b97bd60
_mtx_lock_spin_cookie() at _mtx_lock_spin_cookie+0xa5/frame 0xfffffe001b97bdd0
i8254_delay() at i8254_delay+0x143/frame 0xfffffe001b97be10
_mtx_lock_spin_cookie() at _mtx_lock_spin_cookie+0xa5/frame 0xfffffe001b97be80
i8254_delay() at i8254_delay+0x143/frame 0xfffffe001b97bec0
_mtx_lock_spin_cookie() at _mtx_lock_spin_cookie+0xa5/frame 0xfffffe001b97bf30
i8254_delay() at i8254_delay+0x143/frame 0xfffffe001b97bf70
_mtx_lock_spin_cookie() at _mtx_lock_spin_cookie+0xa5/frame 0xfffffe001b97bfe0
i8254_delay() at i8254_delay+0x143/frame 0xfffffe001b97c020
_mtx_lock_spin_cookie() at _mtx_lock_spin_cookie+0xa5/frame 0xfffffe001b97c090
....

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