Peter Zijlstra 7d42896628 perf_event, x86: Fix 'perf sched record' crashing the machine ... Chris Malley reported that 'perf sched record' sometimes crashes his box with: [ 389.272175] BUG: unable to handle kernel paging request at ffffb300 [ 389.272294] IP: [<c011b0bd>] default_send_IPI_self+0x1d/0x50 [ 389.272366] *pde = 0073f067 *pte = 00000000 [ 389.274708] Call Trace: [ 389.274752] [<c010e3b4>] ? set_perf_event_pending+0x14/0x20 [ 389.274801] [<c01b9751>] ? perf_output_unlock+0x121/0x1a0 [ 389.274848] [<c01b981a>] ? perf_output_end+0x4a/0x70 [ 389.274893] [<c01ba690>] ? __perf_event_overflow+0x240/0x2f0 [ 389.274942] [<c030963e>] ? atomic64_cmpxchg+0x1e/0x30 [ 389.274988] [<c01ba8f4>] ? perf_swevent_ctx_event+0x1b4/0x1c0 [ 389.275035] [<c01ba773>] ? perf_swevent_ctx_event+0x33/0x1c0 [ 389.275081] [<c01ba9a7>] ? do_perf_sw_event+0xa7/0x160 [ 389.275127] [<c01baae2>] ? perf_tp_event+0x82/0xa0 [ 389.275174] [<c012e9c6>] ? ftrace_profile_sched_stat_runtime+0xe6/0x120 [ 389.275224] [<c012e8e0>] ? ftrace_profile_sched_stat_runtime+0x0/0x120 [ 389.275273] [<c013c85a>] ? update_curr+0x18a/0x230 [ 389.275318] [<c013cdc5>] ? put_prev_task_fair+0x155/0x160 [ 389.275366] [<c01618b5>] ? sched_clock_cpu+0xd5/0x110 [ 389.275413] [<c04e7525>] ? _spin_lock_irq+0x45/0x50 [ 389.275458] [<c04e424e>] ? schedule+0x20e/0xb10 The problem is that the box has no lapic enabled: [ 0.042445] Local APIC not detected. Using dummy APIC emulation. The below seems like the best fix. We disabled all lapic bits, except the self-IPI-resend logic. Reported-by: Chris Malley <mail@chrismalley.co.uk> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Cc: Cyrill Gorcunov <gorcunov@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <7863dc4c0909221409v7893bfd3o4b590d5951a233ba@mail.gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>		2009-09-23 11:25:56 +02:00
..
boot	Merge branch 'x86-setup-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-09-14 08:01:47 -07:00
configs	tracing: Rename FTRACE_SYSCALLS for tracepoints	2009-08-26 00:17:35 +02:00
crypto	Merge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-09-14 07:57:32 -07:00
ia32	perf: Do the big rename: Performance Counters -> Performance Events	2009-09-21 14:28:04 +02:00
include/asm	Merge branch 'perfcounters-rename-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-09-21 09:15:07 -07:00
kernel	perf_event, x86: Fix 'perf sched record' crashing the machine	2009-09-23 11:25:56 +02:00
kvm	Merge branch 'kvm-updates/2.6.32' of git://git.kernel.org/pub/scm/virt/kvm/kvm	2009-09-14 17:43:43 -07:00
lguest	x86: Move get/set_wallclock to x86_platform_ops	2009-09-16 14:34:50 +02:00
lib	x86, msr: change msr-reg.o to obj-y, and export its symbols	2009-09-04 10:00:09 -07:00
math-emu
mm	perf: Do the big rename: Performance Counters -> Performance Events	2009-09-21 14:28:04 +02:00
oprofile	perf: Do the big rename: Performance Counters -> Performance Events	2009-09-21 14:28:04 +02:00
pci	Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6	2009-09-16 07:49:54 -07:00
power	x86: Remove final bits of CONFIG_X86_OLD_MCE	2009-09-18 08:31:23 +02:00
vdso	time: Introduce CLOCK_REALTIME_COARSE	2009-08-21 21:43:46 +02:00
video
xen	Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-09-18 14:05:47 -07:00
Kbuild
Kconfig	perf: Do the big rename: Performance Counters -> Performance Events	2009-09-21 14:28:04 +02:00
Kconfig.cpu	x86: add specific support for Intel Atom architecture	2009-08-23 11:20:02 +02:00
Kconfig.debug	kmemcheck: make kconfig accessible for other architectures	2009-06-15 15:49:17 +02:00
Makefile	Merge branch 'x86-kbuild-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-09-14 07:59:07 -07:00
Makefile_32.cpu	x86: add specific support for Intel Atom architecture	2009-08-23 11:20:02 +02:00