Andrey Vagin 20afc60f89 x86, perf: Check that current->mm is alive before getting user callchain ...

An event may occur when an mm is already released.

I added an event in dequeue_entity() and caught a panic with
the following backtrace:

[  434.421110] BUG: unable to handle kernel NULL pointer dereference at 0000000000000050
[  434.421258] IP: [<ffffffff810464ac>] __get_user_pages_fast+0x9c/0x120
...
[  434.421258] Call Trace:
[  434.421258]  [<ffffffff8101ae81>] copy_from_user_nmi+0x51/0xf0
[  434.421258]  [<ffffffff8109a0d5>] ? sched_clock_local+0x25/0x90
[  434.421258]  [<ffffffff8101b048>] perf_callchain_user+0x128/0x170
[  434.421258]  [<ffffffff811154cd>] ? __perf_event_header__init_id+0xed/0x100
[  434.421258]  [<ffffffff81116690>] perf_prepare_sample+0x200/0x280
[  434.421258]  [<ffffffff81118da8>] __perf_event_overflow+0x1b8/0x290
[  434.421258]  [<ffffffff81065240>] ? tg_shares_up+0x0/0x670
[  434.421258]  [<ffffffff8104fe1a>] ? walk_tg_tree+0x6a/0xb0
[  434.421258]  [<ffffffff81118f44>] perf_swevent_overflow+0xc4/0xf0
[  434.421258]  [<ffffffff81119150>] do_perf_sw_event+0x1e0/0x250
[  434.421258]  [<ffffffff81119204>] perf_tp_event+0x44/0x70
[  434.421258]  [<ffffffff8105701f>] ftrace_profile_sched_block+0xdf/0x110
[  434.421258]  [<ffffffff8106121d>] dequeue_entity+0x2ad/0x2d0
[  434.421258]  [<ffffffff810614ec>] dequeue_task_fair+0x1c/0x60
[  434.421258]  [<ffffffff8105818a>] dequeue_task+0x9a/0xb0
[  434.421258]  [<ffffffff810581e2>] deactivate_task+0x42/0xe0
[  434.421258]  [<ffffffff814bc019>] thread_return+0x191/0x808
[  434.421258]  [<ffffffff81098a44>] ? switch_task_namespaces+0x24/0x60
[  434.421258]  [<ffffffff8106f4c4>] do_exit+0x464/0x910
[  434.421258]  [<ffffffff8106f9c8>] do_group_exit+0x58/0xd0
[  434.421258]  [<ffffffff8106fa57>] sys_exit_group+0x17/0x20
[  434.421258]  [<ffffffff8100b202>] system_call_fastpath+0x16/0x1b

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: stable@kernel.org
Link: http://lkml.kernel.org/r/1314693156-24131-1-git-send-email-avagin@openvz.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2011-08-31 15:56:31 +02:00

..

acpi

x86 idle: move mwait_idle_with_hints() to where it is used

2011-08-03 19:06:36 -04:00

apic

x86, UV: Remove UV delay in starting slave cpus

2011-08-05 23:48:34 +02:00

cpu

x86, perf: Check that current->mm is alive before getting user callchain

2011-08-31 15:56:31 +02:00

.gitignore

…

alternative.c

x86-64: Move vread_tsc and vread_hpet into the vDSO

2011-07-14 17:57:05 -07:00

amd_gart_64.c

atomic: use <linux/atomic.h>

2011-07-26 16:49:47 -07:00

amd_nb.c

x86, amd-nb: Rename CPU PCI id define for F4

2011-03-31 08:51:38 +02:00

apb_timer.c

Merge branch 'timers-clocksource-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2011-07-23 10:34:47 -07:00

aperture_64.c

x86, gart: Don't enforce GART aperture lower-bound by alignment

2011-04-18 10:31:38 -07:00

apm_32.c

i8253: Cleanup outb/inb magic

2011-07-01 10:37:15 +02:00

asm-offsets_32.c

lguest: use a special 1:1 linear pagetable mode until first switch.

2011-07-22 14:39:48 +09:30

asm-offsets_64.c

x86: Partly unify asm-offsets_{32,64}.c

2011-02-10 13:31:37 +01:00

asm-offsets.c

x86, asm: Cleanup unnecssary macros in asm-offsets.c

2011-02-25 16:37:32 -08:00

audit_64.c

…

bootflag.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

check.c

x86: Don't check for BIOS corruption in first 64K when there's no need to

2011-03-09 16:36:41 +01:00

cpuid.c

BKL: remove extraneous #include <smp_lock.h>

2010-11-17 08:59:32 -08:00

crash_dump_32.c

crash_dump: export is_kdump_kernel to modules, consolidate elfcorehdr_addr, setup_elfcorehdr and saved_max_pfn

2011-03-23 19:47:19 -07:00

crash_dump_64.c

crash_dump: export is_kdump_kernel to modules, consolidate elfcorehdr_addr, setup_elfcorehdr and saved_max_pfn

2011-03-23 19:47:19 -07:00

crash.c

x86, UV: Make kdump avoid stack dumps

2010-07-21 11:33:27 -07:00

devicetree.c

Merge branch 'of-pci' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc

2011-07-22 14:54:02 -07:00

doublefault_32.c

…

dumpstack_32.c

x86, dumpstack: Correct stack dump info when frame pointer is available

2011-03-18 10:51:42 +01:00

dumpstack_64.c

x86: Don't use frame pointer to save old stack on irq entry

2011-07-02 18:06:36 +02:00

dumpstack.c

Merge branch 'driver-core-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6

2011-05-19 18:24:11 -07:00

e820.c

crash_dump: export is_kdump_kernel to modules, consolidate elfcorehdr_addr, setup_elfcorehdr and saved_max_pfn

2011-03-23 19:47:19 -07:00

early_printk.c

x86, earlyprintk: Move mrst early console to platform/ and fix a typo

2010-12-06 20:52:04 +01:00

early-quirks.c

x86, quirk: Fix SB600 revision check

2011-03-16 14:03:32 +01:00

entry_32.S

x86-32: Fix boot with CONFIG_X86_INVD_BUG

2011-08-25 13:27:14 -07:00

entry_64.S

Merge branch 'x86-vdso-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-tip

2011-08-12 20:46:24 -07:00

ftrace.c

x86/ftrace: Fix compiler warning in ftrace.c

2011-05-25 19:56:26 -04:00

head32.c

Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2011-05-19 18:08:06 -07:00

head64.c

x86: Cleanup highmap after brk is concluded

2011-03-19 11:58:19 -07:00

head_32.S

Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2011-03-15 20:01:36 -07:00

head_64.S

x86, trampoline: Common infrastructure for low memory trampolines

2011-02-17 21:02:43 -08:00

head.c

x86: Use memblock to replace early_res

2010-08-27 11:12:29 -07:00

hpet.c

Merge branch 'x86-vdso-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2011-07-22 17:05:15 -07:00

hw_breakpoint.c

x86: Use this_cpu_ops to optimize code

2010-12-30 12:20:28 +01:00

i386_ksyms_32.c

…

i387.c

treewide: fix potentially dangerous trailing ';' in #defined values/expressions

2011-07-21 14:10:00 +02:00

i8237.c

x86: Use syscore_ops instead of sysdev classes and sysdevs

2011-03-23 22:15:54 +01:00

i8253.c

x86: Use common i8253 clockevent

2011-07-01 10:37:14 +02:00

i8259.c

atomic: use <linux/atomic.h>

2011-07-26 16:49:47 -07:00

init_task.c

Rename .data.cacheline_aligned to .data..cacheline_aligned.

2010-03-03 11:25:58 +01:00

io_delay.c

…

ioport.c

x86: Use bitmap library functions

2011-02-17 14:59:22 +01:00

irq_32.c

x86: Fix common misspellings

2011-03-18 10:39:30 +01:00

irq_64.c

…

irq_work.c

irq_work: Add generic hardirq context callbacks

2010-10-18 19:58:50 +02:00

irq.c

x86: Don't unmask disabled irqs when migrating them

2011-05-19 14:51:08 +02:00

irqinit.c

atomic: use <linux/atomic.h>

2011-07-26 16:49:47 -07:00

jump_label.c

x86, cpu: Clean up and unify the NOP selection infrastructure

2011-04-18 16:40:21 -07:00

kdebugfs.c

llseek: automatically add .llseek fop

2010-10-15 15:53:27 +02:00

kgdb.c

perf: Add context field to perf_event

2011-07-01 11:06:38 +02:00

kprobes.c

kprobes, x86: Disable irqs during optimized callback

2011-05-11 13:21:23 +02:00

kvm.c

KVM guest: KVM Steal time registration

2011-07-24 11:49:36 +03:00

kvmclock.c

KVM guest: KVM Steal time registration

2011-07-24 11:49:36 +03:00

ldt.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

machine_kexec_32.c

…

machine_kexec_64.c

x86, cleanups: Use clear_page/copy_page rather than memset/memcpy

2010-09-22 15:36:49 -07:00

Makefile

Merge branch 'x86-vdso-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-tip

2011-08-12 20:46:24 -07:00

mca_32.c

x86: Fix common misspellings

2011-03-18 10:39:30 +01:00

microcode_amd.c

x86, microcode, AMD: Fix section header size check

2011-06-16 17:23:54 +02:00

microcode_core.c

x86, microcode: Unregister syscore_ops after microcode unloaded

2011-03-29 11:12:04 +02:00

microcode_intel.c

x86/microcode: Fix double vfree() and remove redundant pointer checks before vfree()

2010-12-27 14:33:30 +01:00

mmconf-fam10h_64.c

x86-64: Fix and clean up AMD Fam10 MMCONF enabling

2010-11-18 13:41:35 +01:00

module.c

modules: make arch's use default loader hooks

2011-07-24 22:06:04 +09:30

mpparse.c

x86, ioapic: Consolidate mp_ioapics[] into 'struct ioapic'

2011-05-20 13:40:59 +02:00

msr.c

BKL: remove extraneous #include <smp_lock.h>

2010-11-17 08:59:32 -08:00

paravirt_patch_32.c

…

paravirt_patch_64.c

…

paravirt-spinlocks.c

…

paravirt.c

Merge branch 'x86-vdso-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-tip

2011-08-12 20:46:24 -07:00

pci-calgary_64.c

treewide: Convert uses of struct resource to resource_size(ptr)

2011-06-10 14:55:36 +02:00

pci-dma.c

x86/PCI: Remove dma32_reserve_bootmem

2011-05-10 15:43:32 -07:00

pci-iommu_table.c

arch/x86/kernel/pci-iommu_table.c: Convert sprintf_symbol to %pS

2011-05-10 10:21:35 +02:00

pci-nommu.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

pci-swiotlb.c

x86, swiotlb: Make SWIOTLB use IOMMU_INIT_* macros.

2010-08-26 15:13:37 -07:00

pcspeaker.c

…

probe_roms.c

treewide: Convert uses of struct resource to resource_size(ptr)

2011-06-10 14:55:36 +02:00

process_32.c

cpuidle: stop depending on pm_idle

2011-08-03 19:06:37 -04:00

process_64.c

cpuidle: stop depending on pm_idle

2011-08-03 19:06:37 -04:00

process.c

x86 idle: move mwait_idle_with_hints() to where it is used

2011-08-03 19:06:36 -04:00

ptrace.c

perf: Add context field to perf_event

2011-07-01 11:06:38 +02:00

pvclock.c

x86/pvclock: Zero last_value on resume

2010-11-28 09:33:20 +01:00

quirks.c

x86, quirks: Use pci_dev->revision

2011-07-21 10:26:00 +02:00

reboot_32.S

x86, reboot: Fix relocations in reboot_32.S

2011-05-02 14:44:46 -07:00

reboot_fixups_32.c

x86: Ce4100: Add reboot_fixup() for CE4100

2010-11-12 00:45:41 +01:00

reboot.c

x86: Make Dell Latitude E6420 use reboot=pci

2011-07-21 11:47:17 -07:00

relocate_kernel_32.S

kexec, x86: Fix incorrect jump back address if not preserving context

2011-07-21 11:19:28 +02:00

relocate_kernel_64.S

kexec, x86: Fix incorrect jump back address if not preserving context

2011-07-21 11:19:28 +02:00

resource.c

x86: avoid high BIOS area when allocating address space

2010-12-17 10:01:30 -08:00

rtc.c

rtc: cmos: Add OF bindings

2011-02-23 22:27:55 +01:00

setup_percpu.c

x86: Unify CPU -> NUMA node mapping between 32 and 64bit

2011-01-28 14:54:09 +01:00

setup.c

Merge branch 'linus' into x86/urgent

2011-05-26 13:51:35 +02:00

signal.c

x86: Kill handle_signal()->set_fs()

2011-07-14 21:46:20 -07:00

smp.c

sched: Provide scheduler_ipi() callback in response to smp_send_reschedule()

2011-04-14 08:52:32 +02:00

smpboot.c

Merge branch 'x86-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2011-07-22 17:02:38 -07:00

stacktrace.c

x86: Swap save_stack_trace_regs parameters

2011-06-14 22:48:51 -04:00

step.c

x86-64: Add user_64bit_mode paravirt op

2011-08-04 16:13:49 -07:00

sys_i386_32.c

i386: Make kernel_execve() suitable for stack unwinding

2010-09-03 08:16:02 +02:00

sys_x86_64.c

improve sys_newuname() for compat architectures

2010-03-12 15:52:32 -08:00

syscall_64.c

…

syscall_table_32.S

All Arch: remove linkage for sys_nfsservctl system call

2011-08-26 15:09:58 -07:00

tboot.c

net: remove mm.h inclusion from netdevice.h

2011-06-21 19:17:20 -07:00

tce_64.c

…

test_nx.c

x86: Eliminate various 'set but not used' warnings

2011-05-21 19:10:33 +02:00

test_rodata.c

…

time.c

i8253: Create linux/i8253.h and use it in all 8253 related files

2011-06-09 15:01:37 +02:00

tls.c

…

tls.h

…

topology.c

x86: Fix common misspellings

2011-03-18 10:39:30 +01:00

trampoline_32.S

x86, trampoline: Common infrastructure for low memory trampolines

2011-02-17 21:02:43 -08:00

trampoline_64.S

x86-64, trampoline: Remove unused variable

2011-02-18 15:50:36 -08:00

trampoline.c

x86, trampoline: Common infrastructure for low memory trampolines

2011-02-17 21:02:43 -08:00

traps.c

Merge branch 'x86-vdso-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-tip

2011-08-12 20:46:24 -07:00

tsc_sync.c

…

tsc.c

Merge branches 'x86-detect-hyper-for-linus', 'x86-fpu-for-linus', 'x86-kexec-for-linus', 'x86-platform-for-linus', 'x86-quirks-for-linus', 'x86-tsc-for-linus' and 'x86-smpboot-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2011-07-23 10:38:21 -07:00

verify_cpu.S

x86: Fix common misspellings

2011-03-18 10:39:30 +01:00

vm86_32.c

thp: split_huge_page_mm/vma

2011-01-13 17:32:41 -08:00

vmlinux.lds.S

x86-64: Rework vsyscall emulation and add vsyscall= parameter

2011-08-10 19:26:46 -05:00

vsmp_64.c

…

vsyscall_64.c

x86-64: Rework vsyscall emulation and add vsyscall= parameter

2011-08-10 19:26:46 -05:00

vsyscall_emu_64.S

x86-64: Rework vsyscall emulation and add vsyscall= parameter

2011-08-10 19:26:46 -05:00

vsyscall_trace.h

x86-64: Add vsyscall:emulate_vsyscall trace event

2011-08-04 16:13:53 -07:00

x86_init.c

Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2011-05-19 18:08:06 -07:00

x8664_ksyms_64.c

x86-64, mem: Convert memmove() to assembly file and fix return value bug

2011-01-25 16:58:39 -08:00

xsave.c

x86: Fix common misspellings

2011-03-18 10:39:30 +01:00