> i have no better ideas that what you already tried - but unfortunately
> the tracer makes the bug go away and the NMI watchdog crashes your box.
> Btw., nmi_watchdog=2 might have a higher chance of surviving (it can
> still lock up a T60 but with a lower likelyhood).
Good tip, nmi_watchdog=2 worked. Unlike the previous freezes, after
this one it didn't continue after some minutes. Don't know if that's
because the NMI oopser changed something, or if this is a slightly
different lockup...
No serial port on this laptop, so screenshot done with digicam:
http://www.kernel.org/pub/linux/kernel/people/mszeredi/freeze/nmioops.jpg
Here are the transcribed stack traces:
CPU1
process: strace
_spin_lock
task_rq_lock
wait_task_inactive
ptrace_check_attach
sys_ptrace
CPU0
process: fusexmp_fh (this is one of several similar threads being straced)
_spin_lock_irq
schedule
ptrace_stop
ptrace_notify
syscall_trace
syscall_trace_enter
tracesys
Both these seem to be spinning on rq->lock, but who is holding this
lock?
Miklos
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