Hidehiro Kawai 1717f2096b panic, x86: Fix re-entrance problem due to panic on NMI ...

If panic on NMI happens just after panic() on the same CPU, panic() is
recursively called. Kernel stalls, as a result, after failing to acquire
panic_lock.

To avoid this problem, don't call panic() in NMI context if we've
already entered panic().

For that, introduce nmi_panic() macro to reduce code duplication. In
the case of panic on NMI, don't return from NMI handlers if another CPU
already panicked.

Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Aaron Tomlin <atomlin@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Baoquan He <bhe@redhat.com>
Cc: Chris Metcalf <cmetcalf@ezchip.com>
Cc: David Hildenbrand <dahi@linux.vnet.ibm.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Gobinda Charan Maji <gobinda.cemk07@gmail.com>
Cc: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Javi Merino <javi.merino@arm.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: kexec@lists.infradead.org
Cc: linux-doc@vger.kernel.org
Cc: lkml <linux-kernel@vger.kernel.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Michal Nazarewicz <mina86@mina86.com>
Cc: Nicolas Iooss <nicolas.iooss_linux@m4x.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Seth Jennings <sjenning@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ulrich Obergfell <uobergfe@redhat.com>
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Link: http://lkml.kernel.org/r/20151210014626.25437.13302.stgit@softrs
[ Cleanup comments, fixup formatting. ]
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

2015-12-19 11:07:00 +01:00

..

acpi

x86, ACPI: Handle apic/x2apic entries in MADT in correct order

2015-10-15 01:31:06 +02:00

apic

Merge branch 'linus' into x86/apic

2015-12-19 11:03:18 +01:00

cpu

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

2015-12-08 13:01:23 -08:00

fpu

x86/fpu: Fix get_xsave_addr() behavior under virtualization

2015-11-12 09:34:58 +01:00

kprobes

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

2015-04-14 14:37:47 -07:00

.gitignore

…

alternative.c

x86/alternatives: Make optimize_nops() interrupt safe and synced

2015-09-03 21:27:47 +02:00

amd_gart_64.c

x86: enable DMA CMA with swiotlb

2014-06-04 16:53:57 -07:00

amd_nb.c

x86/gart: Check for GART support before accessing GART registers

2015-05-06 11:15:53 +02:00

apb_timer.c

x86/asm/tsc: Rename native_read_tsc() to rdtsc()

2015-07-06 15:23:28 +02:00

aperture_64.c

x86/gart: Check for GART support before accessing GART registers

2015-05-06 11:15:53 +02:00

apm_32.c

apm32: Fix cputime == jiffies assumption

2015-07-29 15:44:58 +02:00

asm-offsets_32.c

x86: Remove unused TI_cpu

2015-05-05 20:48:02 +02:00

asm-offsets_64.c

x86/asm/entry: (Re-)rename __NR_entry_INT80_compat_max to __NR_syscall_compat_max

2015-06-08 23:43:38 +02:00

asm-offsets.c

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

2015-11-03 21:05:40 -08:00

audit_64.c

x86: hook up execveat system call

2014-12-13 12:42:51 -08:00

bootflag.c

x86: don't use module_init for non-modular core bootflag code

2015-06-16 14:12:34 -04:00

check.c

Merge tag 'v4.2-rc8' into x86/mm, before applying new changes

2015-08-25 09:59:19 +02:00

cpuid.c

x86: Drop bogus __ref / __refdata annotations

2015-07-20 18:57:20 +02:00

crash_dump_32.c

…

crash_dump_64.c

…

crash.c

x86/kexec: Remove obsolete 'in_crash_kexec' flag

2015-10-12 09:43:11 +02:00

devicetree.c

Merge tag 'module_init-device_initcall-v4.1-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux

2015-07-02 10:30:48 -07:00

doublefault.c

…

dumpstack_32.c

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

2015-04-13 13:23:34 -07:00

dumpstack_64.c

x86/kernel: Use kstack_end() in dumpstack_64.c

2015-02-23 18:37:13 +01:00

dumpstack.c

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

2015-04-13 13:23:34 -07:00

e820.c

x86/e820: Deinline e820_type_to_string, save 126 bytes

2015-09-30 21:54:40 +02:00

early_printk.c

x86/early_printk: Set __iomem address space for IO

2015-10-13 21:45:56 +02:00

early-quirks.c

timers/x86/hpet: Type adjustments

2015-10-21 11:17:32 +02:00

espfix_64.c

Merge branch 'x86/urgent' into x86/asm, before applying dependent patches

2015-07-31 10:23:35 +02:00

ftrace.c

ftrace: Calculate the correct dyn_ftrace number to report to the userspace

2015-10-22 15:44:24 -04:00

head32.c

x86: Store a per-cpu shadow copy of CR4

2015-02-04 12:10:42 +01:00

head64.c

x86/kasan: Fix KASAN shadow region page tables

2015-07-06 14:53:13 +02:00

head_32.S

x86/microcode: Merge the early microcode loader

2015-10-21 11:22:12 +02:00

head_64.S

x86/cpu: Call verify_cpu() after having entered long mode too

2015-11-07 10:45:02 +01:00

head.c

…

hpet.c

timers/x86/hpet: Type adjustments

2015-10-21 11:17:32 +02:00

hw_breakpoint.c

perf/x86/hw_breakpoints: Fix check for kernel-space breakpoints

2015-08-04 10:16:55 +02:00

i386_ksyms_32.c

preempt: Use preempt_schedule_context() as the official tracing preemption point

2015-06-07 15:57:42 +02:00

i8237.c

…

i8253.c

clockevents/drivers/i8253: Migrate to new 'set-state' interface

2015-08-10 11:40:30 +02:00

i8259.c

x86/irq: Probe for PIC presence before allocating descs for legacy IRQs

2015-11-07 10:37:37 +01:00

io_delay.c

…

ioport.c

x86/asm/entry: Rename 'init_tss' to 'cpu_tss'

2015-03-06 08:32:58 +01:00

irq_32.c

genirq: Remove irq argument from irq flow handlers

2015-09-16 15:47:51 +02:00

irq_64.c

x86/irq: Drop unlikely before IS_ERR_OR_NULL

2015-10-01 11:08:56 +02:00

irq_work.c

treewide: Remove old email address

2015-11-23 09:44:58 +01:00

irq.c

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

2015-09-01 15:20:51 -07:00

irqinit.c

x86/irq: Store irq descriptor in vector array

2015-08-06 00:14:59 +02:00

jump_label.c

jump_label: Rename JUMP_LABEL_{EN,DIS}ABLE to JUMP_LABEL_{JMP,NOP}

2015-08-03 11:34:12 +02:00

kdebugfs.c

…

kexec-bzimage64.c

Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security

2015-09-08 12:41:25 -07:00

kgdb.c

x86/kgdb: Replace bool_int_array[NR_CPUS] with bitmap

2015-09-28 10:13:31 +02:00

ksysfs.c

…

kvm.c

Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

2015-06-24 09:36:49 -07:00

kvmclock.c

x86: kvmclock: abolish PVCLOCK_COUNTS_FROM_ZERO

2015-10-01 15:06:42 +02:00

ldt.c

x86/ldt: Fix small LDT allocation for Xen

2015-09-14 12:10:50 +02:00

livepatch.c

livepatch: Fix crash with !CONFIG_DEBUG_SET_MODULE_RONX

2015-11-06 11:10:03 +01:00

machine_kexec_32.c

x86, irq: Move IOAPIC related declarations from hw_irq.h into io_apic.h

2014-12-16 14:08:17 +01:00

machine_kexec_64.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/livepatching

2015-06-23 14:07:26 -07:00

Makefile

kexec: split kexec_load syscall from kexec core code

2015-09-10 13:29:01 -07:00

mcount_64.S

x86/ftrace: Add comment on static function tracing

2015-11-19 11:07:49 +01:00

mmconf-fam10h_64.c

…

module.c

x86/mm/KASLR: Propagate KASLR status to kernel proper

2015-04-03 15:26:15 +02:00

mpparse.c

x86: Cleanup irq_domain ops

2015-04-24 15:36:55 +02:00

msr.c

x86, msr: Use seek definitions instead of hard-coded values

2014-10-17 13:40:55 -07:00

nmi_selftest.c

…

nmi.c

panic, x86: Fix re-entrance problem due to panic on NMI

2015-12-19 11:07:00 +01:00

paravirt_patch_32.c

x86/asm/tsc, x86/paravirt: Remove read_tsc() and read_tscp() paravirt hooks

2015-07-06 15:23:26 +02:00

paravirt_patch_64.c

Merge branch 'locking/core' into x86/core, to prepare for dependent patch

2015-06-03 10:07:35 +02:00

paravirt-spinlocks.c

locking/pvqspinlock: Rename QUEUED_SPINLOCK to QUEUED_SPINLOCKS

2015-05-11 09:52:09 +02:00

paravirt.c

x86/paravirt: Replace the paravirt nop with a bona fide empty function

2015-09-22 22:40:28 +02:00

pci-calgary_64.c

…

pci-dma.c

mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd

2015-11-06 17:50:42 -08:00

pci-iommu_table.c

…

pci-nommu.c

…

pci-swiotlb.c

x86/swiotlb: Try coherent allocations with __GFP_NOWARN

2015-06-11 08:28:38 +02:00

pcspeaker.c

…

perf_regs.c

perf/x86/64: Report regs_user->ax too in get_regs_user()

2015-04-11 13:08:53 +02:00

pmem.c

libnvdimm, e820: skip module loading when no type-12

2015-11-30 09:10:33 -08:00

probe_roms.c

…

process_32.c

sched/core, sched/x86: Kill thread_info::saved_preempt_count

2015-10-06 17:08:18 +02:00

process_64.c

sched/x86: Fix typo in __switch_to() comments

2015-10-19 10:18:53 +02:00

process.c

x86/vm86: Set thread.vm86 to NULL on fork/clone

2015-10-31 09:50:25 +01:00

ptrace.c

x86/entry: Move C entry and exit code to arch/x86/entry/common.c

2015-07-07 10:59:05 +02:00

pvclock.c

x86: pvclock: Really remove the sched notifier for cross-cpu migrations

2015-04-27 15:49:30 +02:00

quirks.c

timers/x86/hpet: Type adjustments

2015-10-21 11:17:32 +02:00

reboot_fixups_32.c

…

reboot.c

kexec: split kexec_load syscall from kexec core code

2015-09-10 13:29:01 -07:00

relocate_kernel_32.S

x86/asm: Optimize unnecessarily wide TEST instructions

2015-03-07 11:12:43 +01:00

relocate_kernel_64.S

x86/asm: Replace "MOVQ $imm, %reg" with MOVL

2015-04-01 13:17:39 +02:00

resource.c

x86: don't exclude low BIOS area when allocating address space for non-PCI cards

2014-07-16 12:29:36 -06:00

rtc.c

kernel.h: remove ancient __FUNCTION__ hack

2015-02-12 18:54:13 -08:00

setup_percpu.c

x86: Convert a few more per-CPU items to read-mostly ones

2014-11-04 20:13:28 +01:00

setup.c

x86/microcode: Initialize the driver late when facilities are up

2015-11-23 10:39:49 +01:00

signal_compat.c

x86/compat: Move copy_siginfo_*_user32() to signal_compat.c

2015-07-06 15:28:55 +02:00

signal.c

x86/signal: Fix restart_syscall number for x32 tasks

2015-12-05 18:52:14 +01:00

smp.c

x86/smp: Remove single IPI wrapper

2015-11-05 13:07:54 +01:00

smpboot.c

x86 smpboot: Re-enable init_udelay=0 by default on modern CPUs

2015-11-25 23:17:48 +01:00

stacktrace.c

…

step.c

Merge branch 'x86/urgent' into x86/asm to fix up conflicts and to pick up fixes

2015-08-18 09:39:47 +02:00

sys_x86_64.c

x86/mm: Improve AMD Bulldozer ASLR workaround

2015-03-31 10:01:17 +02:00

sysfb_efi.c

…

sysfb_simplefb.c

x86/simplefb: Use PTR_ERR_OR_ZERO

2014-10-17 13:40:52 -07:00

sysfb.c

x86/sysfb: Use PTR_ERR_OR_ZERO

2014-10-17 13:40:52 -07:00

tboot.c

…

tce_64.c

…

test_nx.c

…

test_rodata.c

treewide: Fix typo in printk messages

2015-03-06 23:05:39 +01:00

time.c

x86/asm/entry: Change all 'user_mode_vm()' calls to 'user_mode()'

2015-03-23 11:14:17 +01:00

tls.c

x86, tls: Interpret an all-zero struct user_desc as "no segment"

2015-01-22 21:45:07 +01:00

tls.h

…

topology.c

x86: Drop bogus __ref / __refdata annotations

2015-07-20 18:57:20 +02:00

trace_clock.c

x86/asm/tsc: Add rdtsc_ordered() and use it in trivial call sites

2015-07-06 15:23:29 +02:00

tracepoint.c

…

traps.c

x86/fpu/mpx: Rework MPX 'xstate' types

2015-09-14 12:22:00 +02:00

tsc_msr.c

…

tsc_sync.c

x86/asm/tsc/sync: Use rdtsc_ordered() in check_tsc_warp() and drop extra barriers

2015-07-06 15:23:29 +02:00

tsc.c

perf/x86: Fix time_shift in perf_event_mmap_page

2015-10-20 10:30:52 +02:00

uprobes.c

uprobes/x86: Make arch_uretprobe_is_alive(RP_CHECK_CALL) more clever

2015-07-31 10:38:06 +02:00

verify_cpu.S

x86/cpu: Call verify_cpu() after having entered long mode too

2015-11-07 10:45:02 +01:00

vm86_32.c

x86/vm86: Block non-root vm86(old) if mmap_min_addr != 0

2015-09-05 09:01:16 +02:00

vmlinux.lds.S

kexec: split kexec_load syscall from kexec core code

2015-09-10 13:29:01 -07:00

vsmp_64.c

x86: replace __init_or_module with __init in non-modular vsmp_64.c

2015-06-16 14:12:41 -04:00

x86_init.c

Merge tag 'pci-v4.2-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci

2015-06-23 13:41:24 -07:00

x8664_ksyms_64.c

preempt: Use preempt_schedule_context() as the official tracing preemption point

2015-06-07 15:57:42 +02:00