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Date:	29 Oct 2009 20:15:03 +0100
From:	Soeren Sandmann <>
Subject: Hard lockup with timer events


This program

locks up hard for me on a Pentium 4 in 32 bit mode, with the hrtimer
patches applied (-tip for example).

What the program does is spawn a thread that just spins, and then 400
threads that each create a performance counter of type
PERF_COUNT_SW_CPU_CLOCK and a sample period of 1000000 and a
sample_type of


These threads then map the event buffer and read it continuously.

It does not apparently lock up if SAMPLE_CALLCHAIN is removed; also I
cannot get it to lock up on Core 2 Duo in either 32 or 64 bit mode.

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