linux-2.6.17-mm6: can not stop machine: bad spinlock magic

I saw this bug only on linux-2.6.17-mm6, not on 2.6.18-rc1-mm1.

But this bug happened very rare, and may be I'll see it later,
so I report it just in case:

$sudo /sbin/poweroff
...
* Stopping syslog-ng
BUG: soft lockup detected on CPU#0!
show_trace
dump_stack
softlockup_tick
run_local_timers
update_process_times
timer_interrupt
handle_IRQ_event
handle_level_irq
do_IRQ
common_interrupt
ktime_get_ts
copy_process
do_fork
sys_fork
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