panic: APIC: Previous IPI is stuck

This is on a 2xAthlon with the SCHED_ULE, HZ=1000, SW_WATCHDOG, and nothing
really special in development.

FreeBSD green.homeunix.org 6.0-CURRENT FreeBSD 6.0-CURRENT #110: Wed Sep 22 11:28:27 EDT 2004     root_at_green.homeunix.org:/usr/src/sys/i386/compile/GREEN  i386

panic: APIC: Previous IPI is stuck
cpuid = 1
KDB: stack backtrace:
kdb_backtrace(c063cae7,1,c063c5e7,d4411b28,c1da2000) at kdb_backtrace+0x2e
panic(c063c5e7,1,f3,1,2) at panic+0x128
lapic_ipi_vectored(f3,1,c1da2494,1,c0675910) at 64) at sched_add_internal+0x21e
kseq_assign(c0675910,1,c0625a07,5e0,c1da1540) at kseq_assign+0x4a
sched_clock(c1da2000,2,c0621165,17e,d4411c54) at sched_clock+0x74
statclock(d4411c54,c1ecc840,d4411c3c,c05edc8b,d4411c54) at statclock+0xf8
rtcintr(d4411c54,c0487af4,c06733a0,2,8) at rtcintr+0x4f
intr_execute_handlers(c1dca8f0,d4411c54,d4411cb4,c05ea0e3,38) at intr_execute_ha
ndlers+0xab
lapic_handle_intr(38) at lapic_handle_intr+0x3a
Xapic_isr1() at Xapic_isr1+0x33
--- interrupt, eip = 0xc04a640a, esp = 0xd4411c98, ebp = 0xd4411cb4 ---
_mtx_lock_sleep(c06733e0,c1da2000,0,c06220e8,222) at _mtx_lock_sleep+0x13a
_mtx_lock_flags(c06733e0,0,c06220e8,222,0) at _mtx_lock_flags+0xc0
ithread_loop(c1da6200,d4411d48,c0621edb,31f,c1da6200) at ithread_loop+0x15a
fork_exit(c0499660,c1da6200,d4411d48) at fork_exit+0xc6
fork_trampoline() at fork_trampoline+0x8
--- trap 0x1, eip = 0, esp = 0xd4411d7c, ebp = 0 ---
KDB: enter: panic
panic: APIC: Previous IPI is stuck
cpuid = 1
boot() called on cpu#1
Uptime: 2d0h16m55s
^^ full hang instead of reset

-- 
Brian Fundakowski Feldman                           \'[ FreeBSD ]''''''''''\
  <> green_at_FreeBSD.org                               \  The Power to Serve! \
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