https://bugzilla.kernel.org/show_bug.cgi?id=21952


Seth Forshee <[email protected]> changed:

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--- Comment #42 from Seth Forshee <[email protected]>  2011-02-24 
01:03:23 ---
I've been debugging this issue a little with an N150. It's still present as of
v2.6.38-rc6.

In addition to what's been reported here, I've observed that
acpi_skip_timer_override and nohpet seem to make this issue go away. I've
traced it down to something going wrong when bringing the secondary logical CPU
online. When the hpet code receives the CPU_ONLINE notification the primary CPU
schedules some work on the secondary CPU and waits for it to complete, but the
work is never getting executed. The secondary CPU is coming online and
executing instructions, and I haven't isolated exactly where it hangs.

I've also noticed that this problem seems to be timing sensitive, so it's
entirely possible that some of the command-line options that "fix" the issue
just alter the timing enough to mask it.

Let me know if there's anything you want me to try, and I'll post any further
findings here as well.

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