Chuck Ebbert wrote:
Well, turns out this is a heisenbug. Which is good, since it means the
nop patch didn't change anything.
Try leaving the spinlocks and just disabling the callbacks. And maybe
enable spinlock debugging...
I tried removing all the spinlocks inside the interrupt handler. Seemed
to work fine for a while, but still hung (at worst, it looks missing
locks means we might screw up and read / write the wrong CMOS register,
not hang or crash).
So I took down 2nd CPU with hotplug (did not yet try UP kernel though).
It took a longer time, but still hung. Seems not to be a spinlock
problem, but I'll turn on debugging anyway.
CONFIG_HPET_EMULATE_RTC=y
Did you try without that?
Will do. That looks much more suspicious like. I thought I killed it
already, but had only got this:
# CONFIG_HPET_RTC_IRQ is not set
If that still crashes, I'll try running cmos access in a loop in userspace to see if
maybe the port I/O is tickling a chipset bug (the only other report I know of is on
same chipset, nVidia MCP51). Maybe SMM handler is accessing CMOS or something wacked
out. <laughs hysterical... stops laughing when the theory actually sounds
plausible>. Stuck in SMM is not good for CPU thermal throttling ... hopefully
Turion's don't reach nuclear emission point.
Would also explain maybe why NMI watchdog doesn't seem to notice anything wrong.
Thanks,
Zach
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