Ingo Molnar 67f2de0bf9 x86: dumpstack, 64-bit: Disable preemption when walking the IRQ/exception stacks ...

This warning:

[  847.140022] rb_producer   D 0000000000000000  5928   519      2 0x00000000
[  847.203627] BUG: using smp_processor_id() in preemptible [00000000] code: khungtaskd/517
[  847.207360] caller is show_stack_log_lvl+0x2e/0x241
[  847.210364] Pid: 517, comm: khungtaskd Not tainted 2.6.32-rc8-tip+ #13761
[  847.213395] Call Trace:
[  847.215847]  [<ffffffff81413bde>] debug_smp_processor_id+0x1f0/0x20a
[  847.216809]  [<ffffffff81015eae>] show_stack_log_lvl+0x2e/0x241
[  847.220027]  [<ffffffff81018512>] show_stack+0x1c/0x1e
[  847.223365]  [<ffffffff8107b7db>] sched_show_task+0xe4/0xe9
[  847.226694]  [<ffffffff8112f21f>] check_hung_task+0x140/0x199
[  847.230261]  [<ffffffff8112f4a8>] check_hung_uninterruptible_tasks+0x1b7/0x20f
[  847.233371]  [<ffffffff8112f500>] ? watchdog+0x0/0x50
[  847.236683]  [<ffffffff8112f54e>] watchdog+0x4e/0x50
[  847.240034]  [<ffffffff810cee56>] kthread+0x97/0x9f
[  847.243372]  [<ffffffff81012aea>] child_rip+0xa/0x20
[  847.246690]  [<ffffffff81e43494>] ? restore_args+0x0/0x30
[  847.250019]  [<ffffffff81e43083>] ? _spin_lock+0xe/0x10
[  847.253351]  [<ffffffff810cedbf>] ? kthread+0x0/0x9f
[  847.256833]  [<ffffffff81012ae0>] ? child_rip+0x0/0x20

Happens because on preempt-RCU, khungd calls show_stack() with
preemption enabled.

Make sure we are not preemptible while walking the IRQ and exception
stacks on 64-bit. (32-bit stack dumping is preemption safe.)

Signed-off-by: Ingo Molnar <mingo@elte.hu>

2009-11-26 08:29:10 +01:00

..

acpi

x86: Document linker script ASSERT() quirk

2009-10-16 07:18:46 +02:00

apic

cpumask: Avoid cpumask_t in arch/x86/kernel/apic/nmi.c

2009-11-04 13:17:53 +01:00

cpu

x86, cpu: mv display_cacheinfo -> cpu_detect_cache_sizes

2009-11-23 11:59:53 -08:00

.gitignore

…

alternative.c

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

amd_iommu_init.c

Merge branch 'amd-iommu/passthrough' into amd-iommu/2.6.32

2009-09-03 16:34:23 +02:00

amd_iommu.c

Merge branch 'amd-iommu/pagetable' into amd-iommu/2.6.32

2009-09-03 17:14:57 +02:00

aperture_64.c

kmemleak: Ignore the aperture memory hole on x86_64

2009-09-01 11:12:32 +01:00

apm_32.c

Merge commit 'origin/x86/urgent' into x86/asm

2009-08-25 15:40:29 -07:00

asm-offsets_32.c

lguest: optimize by coding restore_flags and irq_enable in assembler.

2009-06-12 22:27:03 +09:30

asm-offsets_64.c

tracing: Define NR_syscalls for x86_64

2009-08-26 21:29:58 +02:00

asm-offsets.c

…

audit_64.c

…

bios_uv.c

x86, UV: system table in bios accessed after unmap

2009-04-03 19:25:57 +02:00

bootflag.c

…

check.c

x86: fix 64k corruption-check

2009-03-15 07:03:15 +01:00

cpuid.c

Driver-Core: extend devnode callbacks to provide permissions

2009-09-19 12:50:38 -07:00

crash_dump_32.c

x86: crash_dump: Fix non-pae kdump kernel memory accesses

2009-10-26 12:38:59 +01:00

crash_dump_64.c

kdump: make elfcorehdr_addr independent of CONFIG_PROC_VMCORE

2008-10-20 08:52:39 -07:00

crash.c

x86: disable IOMMUs on kernel crash

2009-06-15 15:20:40 +02:00

doublefault_32.c

x86: Use get_desc_base()

2009-07-19 18:27:51 +02:00

ds_selftest.c

x86, ds: fix buffer alignment in debug store selftest

2009-04-24 10:18:51 +02:00

ds_selftest.h

x86, bts: cleanups

2009-03-13 11:57:22 +01:00

ds.c

x86: ds.c fix invalid assignment

2009-06-20 17:53:13 +02:00

dumpstack_32.c

x86: dumpstack: Clean up the x86_stack_ids[][] initalization and other details

2009-11-26 08:24:33 +01:00

dumpstack_64.c

x86: dumpstack, 64-bit: Disable preemption when walking the IRQ/exception stacks

2009-11-26 08:29:10 +01:00

dumpstack.c

x86: Remove duplicated #include

2009-07-11 10:17:08 +02:00

dumpstack.h

x86: avoid multiple declaration of kstack_depth_to_print

2009-04-14 11:45:33 +02:00

e820.c

pci: increase alignment to make more space for hidden code

2009-10-11 14:43:36 -07:00

early_printk.c

x86: earlyprintk: Fix regression to handle serial,ttySn as 1 arg

2009-10-01 10:34:16 +02:00

early-quirks.c

x86 early quirks: eliminate unused function

2009-04-08 14:16:32 +02:00

efi_32.c

…

efi_64.c

x86: Make 64-bit efi_ioremap use ioremap on MMIO regions

2009-08-03 13:34:25 -07:00

efi_stub_32.S

Merge branch 'x86/asm' into x86/mm

2009-02-25 08:27:46 +01:00

efi_stub_64.S

x86: efi_stub_32,64 - add missing ENDPROCs

2009-02-24 18:08:40 +01:00

efi.c

x86: Make EFI RTC function depend on 32bit again

2009-10-27 12:35:48 +01:00

entry_32.S

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

2009-06-20 10:56:46 -07:00

entry_64.S

x86: ptrace: sysret path should reach syscall_trace_leave

2009-09-22 20:33:42 -07:00

ftrace.c

tracing: Convert event tracing code to use NR_syscalls

2009-08-26 21:30:02 +02:00

geode_32.c

…

head32.c

x86: Add Moorestown early detection

2009-08-31 11:09:40 +02:00

head64.c

x86: Add early platform detection

2009-08-31 11:09:40 +02:00

head_32.S

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

2009-09-26 10:13:35 -07:00

head_64.S

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

2009-09-26 10:13:35 -07:00

head.c

x86, debug: remove EBDA debug printk

2008-12-12 11:08:42 +01:00

hpet.c

x86: hpet: Mark per cpu interrupts IRQF_TIMER to prevent resume failure

2009-06-14 18:24:29 +02:00

i386_ksyms_32.c

x86: Don't generate cmpxchg8b_emu if CONFIG_X86_CMPXCHG64=y

2009-10-01 08:42:24 +02:00

i387.c

x86, math-emu: fix init_fpu for task != current

2009-03-04 20:33:16 +01:00

i8237.c

i8327: fix outb() parameter order

2009-02-10 13:13:23 +01:00

i8253.c

x86: Do not unregister PIT clocksource on PIT oneshot setup/shutdown

2009-08-21 21:13:37 +02:00

i8259.c

x86: refactor x86_quirks support

2009-02-23 00:08:11 +01:00

init_task.c

Use new __init_task_data macro in arch init_task.c files.

2009-09-21 06:27:08 +02:00

io_delay.c

x86: io_delay.c cleanup

2009-03-21 16:57:04 +05:30

ioport.c

x86-32: use non-lazy io bitmap context switching

2009-03-02 12:07:48 +01:00

irq_32.c

x86: Use printk_once()

2009-08-09 22:28:34 +02:00

irq_64.c

x86: unify do_IRQ()

2009-02-09 12:16:05 +01:00

irq.c

Merge branch 'linus' into x86/urgent

2009-10-15 08:07:30 +02:00

irqinit.c

perf: Do the big rename: Performance Counters -> Performance Events

2009-09-21 14:28:04 +02:00

k8.c

x86, gart: fix gart detection for Fam11h CPUs

2008-10-28 17:10:27 +01:00

kdebugfs.c

x86: kdebugfs.c cleanup

2009-03-21 16:55:45 +05:30

kgdb.c

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

2009-06-10 15:49:10 -07:00

kprobes.c

Merge branch 'tracing/core-v2' into tracing-for-linus

2009-04-02 00:49:02 +02:00

kvm.c

KVM guest: do not batch pte updates from interrupt context

2009-09-10 18:10:50 +03:00

kvmclock.c

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

ldt.c

cpumask: use mm_cpumask() wrapper: x86

2009-09-24 09:34:52 +09:30

machine_kexec_32.c

x86, kexec: fix crashdump panic with CONFIG_KEXEC_JUMP

2009-05-07 22:01:05 -07:00

machine_kexec_64.c

x86, kexec: fix crashdump panic with CONFIG_KEXEC_JUMP

2009-05-07 22:01:05 -07:00

Makefile

Merge branch 'linus' into sfi-release

2009-09-19 00:11:26 -04:00

mca_32.c

x86: refactor x86_quirks support

2009-02-23 00:08:11 +01:00

mfgpt_32.c

x86: geode: Mark mfgpt irq IRQF_TIMER to prevent resume failure

2009-07-24 08:42:52 +02:00

microcode_amd.c

x86, microcode: Simplify vfree() use

2009-06-07 16:35:11 +02:00

microcode_core.c

mm: replace various uses of num_physpages by totalram_pages

2009-09-22 07:17:38 -07:00

microcode_intel.c

x86: microcode: use smp_call_function_single instead of set_cpus_allowed, cleanup of synchronization logic

2009-05-12 10:36:44 +02:00

mmconf-fam10h_64.c

x86: move various CPU initialization objects into .cpuinit.rodata

2009-03-12 13:13:07 +01:00

module.c

module: cleanup FIXME comments about trimming exception table entries.

2009-06-12 21:47:05 +09:30

mpparse.c

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

mrst.c

x86: Add Moorestown early detection

2009-08-31 11:09:40 +02:00

msr.c

Driver-Core: extend devnode callbacks to provide permissions

2009-09-19 12:50:38 -07:00

olpc.c

x86, olpc: fix model detection without OFW

2009-02-14 23:05:25 +01:00

paravirt_patch_32.c

x86/pvops: add a paravirt_ident functions to allow special patching

2009-01-30 14:51:44 -08:00

paravirt_patch_64.c

x86/pvops: add a paravirt_ident functions to allow special patching

2009-01-30 14:51:44 -08:00

paravirt-spinlocks.c

x86: remove byte locks

2009-01-20 17:14:28 +01:00

paravirt.c

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

pci-calgary_64.c

x86: calgary: remove IOMMU_DEBUG

2009-04-14 13:03:36 +02:00

pci-dma.c

Merge git://git.infradead.org/~dwmw2/iommu-2.6.32

2009-10-13 10:04:40 -07:00

pci-gart_64.c

headers: remove sched.h from interrupt.h

2009-10-11 11:20:58 -07:00

pci-nommu.c

dma-ops: Remove flush_write_buffers() in dma-mapping-common.h

2009-08-10 09:34:57 +02:00

pci-swiotlb.c

Merge git://git.infradead.org/iommu-2.6

2009-09-23 10:06:10 -07:00

pcspeaker.c

…

pmtimer_64.c

…

probe_roms_32.c

x86: move mach-default/*.h files to asm/

2009-01-29 14:16:51 +01:00

process_32.c

x86: Make sure we also print a Code: line for show_regs()

2009-11-03 16:50:22 +01:00

process_64.c

x86: Make sure we also print a Code: line for show_regs()

2009-11-03 16:50:22 +01:00

process.c

cpumask: use zalloc_cpumask_var() where possible

2009-09-24 09:34:24 +09:30

ptrace.c

x86: ptrace: set TS_COMPAT when 32-bit ptrace sets orig_eax>=0

2009-09-22 22:49:24 -07:00

pvclock.c

x86: Fix warning in pvclock.c

2009-07-14 16:25:05 +02:00

quirks.c

x86/PCI: pci quirks, fix pci refcounting

2009-09-09 14:11:02 -07:00

reboot_fixups_32.c

…

reboot.c

headers: remove sched.h from interrupt.h

2009-10-11 11:20:58 -07:00

relocate_kernel_32.S

x86, kexec: fix kexec x86 coding style

2009-03-10 18:13:25 -07:00

relocate_kernel_64.S

x86, kexec: x86_64: add kexec jump support for x86_64

2009-03-10 18:13:25 -07:00

rtc.c

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

scx200_32.c

…

setup_percpu.c

x86,percpu: use embedding for 64bit NUMA and page for 32bit NUMA

2009-08-14 15:00:52 +09:00

setup.c

Merge branch 'sfi-release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-sfi-2.6

2009-09-23 09:34:07 -07:00

sfi.c

SFI: remove unneeded includes

2009-09-15 15:08:40 -04:00

signal.c

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

2009-09-17 21:07:08 -07:00

smp.c

Revert "x86, timers: Check for pending timers after (device) interrupts"

2009-10-09 15:58:20 +02:00

smpboot.c

cpumask: use zalloc_cpumask_var() where possible

2009-09-24 09:34:24 +09:30

stacktrace.c

x86: add save_stack_trace_bp() for tracing from a specific stack frame

2009-06-12 23:01:05 +02:00

step.c

x86: Use get_desc_base()

2009-07-19 18:27:51 +02:00

sys_i386_32.c

…

sys_x86_64.c

tracing: Convert x86_64 mmap and uname to use DEFINE_SYSCALL

2009-08-11 20:35:29 +02:00

syscall_64.c

x86: Fix ASM_X86__ header guards

2008-10-22 22:55:23 -07:00

syscall_table_32.S

perf: Do the big rename: Performance Counters -> Performance Events

2009-09-21 14:28:04 +02:00

tboot.c

x86, intel_txt: clean up the impact on generic code, unbreak non-x86

2009-09-01 18:25:07 -07:00

tce_64.c

…

test_nx.c

…

test_rodata.c

…

time.c

x86: fix kernel panic on 32 bits when profiling

2009-10-12 11:53:51 -07:00

tlb_uv.c

x86, UV: Fix and clean up bau code to use uv_gpa_to_pnode()

2009-10-16 14:51:53 +02:00

tls.c

…

tls.h

…

topology.c

x86: topology.c cleanup

2009-03-21 16:55:24 +05:30

trampoline_32.S

x86: cpuinit-annotate SMP boot trampolines properly

2009-09-20 20:23:37 +02:00

trampoline_64.S

x86: Fix Suspend to RAM freeze on Acer Aspire 1511Lmi laptop

2009-10-12 18:06:48 +02:00

trampoline.c

x86: Fix Suspend to RAM freeze on Acer Aspire 1511Lmi laptop

2009-10-12 18:06:48 +02:00

traps.c

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

2009-09-26 10:13:35 -07:00

tsc_sync.c

x86: Reduce verbosity of "TSC is reliable" message

2009-09-24 11:35:19 +02:00

tsc.c

Merge branch 'linus' into x86/urgent

2009-09-20 20:25:03 +02:00

uv_irq.c

x86, apic: remove genapic.h

2009-02-17 17:52:44 +01:00

uv_sysfs.c

x86: prevent /sys/firmware/sgi_uv from being created on non-uv systems

2009-04-08 14:58:10 +02:00

uv_time.c

uv_time: add parameter to uv_read_rtc()

2009-04-22 17:41:25 +02:00

verify_cpu_64.S

…

visws_quirks.c

x86: Add timer_init to x86_init_ops

2009-08-31 09:35:46 +02:00

vm86_32.c

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

2009-06-10 16:15:14 -07:00

vmi_32.c

x86, vmi: Mark VMI deprecated and schedule it for removal

2009-10-08 22:27:55 +02:00

vmiclock_32.c

x86: Move tsc_calibration to x86_init_ops

2009-08-31 09:35:47 +02:00

vmlinux.lds.S

x86: Document linker script ASSERT() quirk

2009-10-16 07:18:46 +02:00

vsmp_64.c

Revert "x86: don't compile vsmp_64 for 32bit"

2009-03-25 21:34:28 +01:00

vsyscall_64.c

sysctl: remove "struct file *" argument of ->proc_handler

2009-09-24 07:21:04 -07:00

x86_init.c

x86: Move get/set_wallclock to x86_platform_ops

2009-09-16 14:34:50 +02:00

x8664_ksyms_64.c

x86: convert pda ops to wrappers around x86 percpu accessors

2009-01-16 14:20:22 +01:00

xsave.c

x86-64: fix FPU corruption with signals and preemption

2009-04-20 14:33:00 -07:00