perf related boot hang.

[Dave Jones]

On Linus current tree, when I cold-boot one of my boxes, it locks up
during boot up with this trace..

Kernel panic - not syncing: Watchdog detected hard LOCKUP on cpu 2
CPU: 2 PID: 577 Comm: in:imjournal Not tainted 3.16.0+ #33
 ffff880244c06c88 000000008b73013e ffff880244c06bf0 ffffffffb47ee207
 ffffffffb4c51118 ffff880244c06c78 ffffffffb47ebcf8 0000000000000010
 ffff880244c06c88 ffff880244c06c20 000000008b73013e 0000000000000000
Call Trace:
 <NMI>  [<ffffffffb47ee207>] dump_stack+0x4e/0x7a
 [<ffffffffb47ebcf8>] panic+0xd4/0x207
 [<ffffffffb4145448>] watchdog_overflow_callback+0x118/0x120
 [<ffffffffb4186f0e>] __perf_event_overflow+0xae/0x350
 [<ffffffffb4185380>] ? perf_event_task_disable+0xa0/0xa0
 [<ffffffffb401a4ef>] ? x86_perf_event_set_period+0xbf/0x150
 [<ffffffffb4187d34>] perf_event_overflow+0x14/0x20
 [<ffffffffb40203a6>] intel_pmu_handle_irq+0x206/0x410
 [<ffffffffb401939b>] perf_event_nmi_handler+0x2b/0x50
 [<ffffffffb4007b72>] nmi_handle+0xd2/0x390
 [<ffffffffb4007aa5>] ? nmi_handle+0x5/0x390
 [<ffffffffb40d8301>] ? lock_acquired+0x131/0x450
 [<ffffffffb4008062>] default_do_nmi+0x72/0x1c0


If I reset it, it then seems to always boot up fine.

	Dave
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