Konstantin Khlebnikov 4d1f0fb096 kernel/watchdog: use nmi registers snapshot in hardlockup handler ... NMI handler doesn't call set_irq_regs(), it's set only by normal IRQ. Thus get_irq_regs() returns NULL or stale registers snapshot with IP/SP pointing to the code interrupted by IRQ which was interrupted by NMI. NULL isn't a problem: in this case watchdog calls dump_stack() and prints full stack trace including NMI. But if we're stuck in IRQ handler then NMI watchlog will print stack trace without IRQ part at all. This patch uses registers snapshot passed into NMI handler as arguments: these registers point exactly to the instruction interrupted by NMI. Fixes: 55537871ef ("kernel/watchdog.c: perform all-CPU backtrace in case of hard lockup") Link: http://lkml.kernel.org/r/146771764784.86724.6006627197118544150.stgit@buzz Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Cc: Jiri Kosina <jkosina@suse.cz> Cc: Ulrich Obergfell <uobergfe@redhat.com> Cc: Aaron Tomlin <atomlin@redhat.com> Cc: <stable@vger.kernel.org> [4.4+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2016-12-14 16:04:07 -08:00
..
bpf	bpf: xdp: Allow head adjustment in XDP prog	2016-12-08 14:25:13 -05:00
configs	config: android: enable CONFIG_SECCOMP	2016-10-11 15:06:32 -07:00
debug	printk/kdb: handle more message headers	2016-12-12 18:55:09 -08:00
events	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2016-12-10 16:21:55 -05:00
gcov	gcov: add support for gcc version >= 6	2016-07-15 14:54:27 +09:00
irq	Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2016-12-12 20:23:11 -08:00
livepatch	livepatch/module: make TAINT_LIVEPATCH module-specific	2016-08-26 14:42:08 +02:00
locking	Merge branch 'linus' into locking/core, to pick up fixes	2016-12-11 13:07:13 +01:00
power	Merge branch 'for-4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq	2016-12-13 12:59:57 -08:00
printk	Merge branch 'akpm' (patches from Andrew)	2016-12-12 20:50:02 -08:00
rcu	rcu: Don't kick unless grace period or request	2016-11-14 10:46:31 -08:00
sched	Power management material for v4.10-rc1	2016-12-13 10:41:53 -08:00
time	Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2016-12-12 19:56:15 -08:00
trace	Merge branch 'for-4.10/block' of git://git.kernel.dk/linux-block	2016-12-13 10:19:16 -08:00
.gitignore	…
Kconfig.freezer	…
Kconfig.hz	…
Kconfig.locks	locking/mutex: Allow MUTEX_SPIN_ON_OWNER when DEBUG_MUTEXES	2016-10-25 11:31:51 +02:00
Kconfig.preempt	…
Makefile	userns: Add per user namespace sysctls.	2016-08-08 13:18:58 -05:00
acct.c	…
async.c	…
audit.c	audit: remove useless synchronize_net()	2016-12-01 11:29:02 -05:00
audit.h	Merge branch 'stable-4.8' of git://git.infradead.org/users/pcmoore/audit	2016-07-29 17:54:17 -07:00
audit_fsnotify.c	…
audit_tree.c	audit: cleanup prune_tree_thread	2016-04-04 09:46:47 -04:00
audit_watch.c	Merge branch 'stable-4.8' of git://git.infradead.org/users/pcmoore/audit	2016-09-01 15:55:56 -07:00
auditfilter.c	audit: add fields to exclude filter by reusing user filter	2016-06-27 11:01:00 -04:00
auditsc.c	Merge branch 'stable-4.9' of git://git.infradead.org/users/pcmoore/audit	2016-10-04 14:21:41 -07:00
backtracetest.c	…
bounds.c	…
capability.c	kernel: Add noaudit variant of ns_capable()	2016-06-06 20:16:18 +10:00
cgroup.c	cgroup: add support for eBPF programs	2016-11-25 16:25:52 -05:00
cgroup_freezer.c	…
cgroup_pids.c	cgroup: Use lld instead of ld when printing pids controller events_limit	2016-06-21 15:03:36 -04:00
compat.c	posix-timers: Make them configurable	2016-11-16 09:26:35 +01:00
configs.c	…
context_tracking.c	…
cpu.c	hotplug: Make register and unregister notifier API symmetric	2016-12-08 10:08:41 +01:00
cpu_pm.c	…
cpuset.c	Merge branch 'for-4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup	2016-10-14 12:18:50 -07:00
crash_dump.c	…
cred.c	cred: Reject inodes with invalid ids in set_create_file_as()	2016-06-30 18:05:09 -05:00
delayacct.c	…
dma.c	…
elfcore.c	…
exec_domain.c	…
exit.c	Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2016-12-12 19:56:15 -08:00
extable.c	…
fork.c	Power management material for v4.10-rc1	2016-12-13 10:41:53 -08:00
freezer.c	freezer, oom: check TIF_MEMDIE on the correct task	2016-07-28 16:07:41 -07:00
futex.c	sched/wake_q: Rename WAKE_Q to DEFINE_WAKE_Q	2016-11-21 10:29:01 +01:00
futex_compat.c	…
groups.c	cred: simpler, 1D supplementary groups	2016-10-07 18:46:30 -07:00
hung_task.c	hung_task: decrement sysctl_hung_task_warnings only if it is positive	2016-12-12 18:55:09 -08:00
irq_work.c	…
jump_label.c	powerpc updates for 4.8 #2	2016-08-05 09:00:54 -04:00
kallsyms.c	…
kcmp.c	…
kcov.c	kcov: add missing #include <linux/sched.h>	2016-12-07 17:10:00 -08:00
kexec.c	kexec: allow architectures to override boot mapping	2016-08-02 19:35:27 -04:00
kexec_core.c	kexec: add restriction on kexec_load() segment sizes	2016-08-02 19:35:31 -04:00
kexec_file.c	kexec: fix double-free when failing to relocate the purgatory	2016-09-01 17:52:01 -07:00
kexec_internal.h	…
kmod.c	…
kprobes.c	kprobes: include <asm/sections.h> instead of <asm-generic/sections.h>	2016-10-11 15:06:31 -07:00
ksysfs.c	kexec: add a kexec_crash_loaded() function	2016-08-02 19:35:30 -04:00
kthread.c	kthread: add __printf attributes	2016-12-12 18:55:06 -08:00
latencytop.c	…
membarrier.c	…
memremap.c	mm: fix cache mode of dax pmd mappings	2016-09-09 17:34:46 -07:00
module-internal.h	…
module.c	Re-enable CONFIG_MODVERSIONS in a slightly weaker form	2016-11-29 16:01:30 -08:00
module_signing.c	KEYS: Move the point of trust determination to __key_link()	2016-04-11 22:43:43 +01:00
notifier.c	…
nsproxy.c	…
padata.c	padata: Convert to hotplug state machine	2016-09-19 21:44:30 +02:00
panic.c	x86/panic: replace smp_send_stop() with kdump friendly version in panic path	2016-10-11 15:06:32 -07:00
params.c	…
pid.c	remove lots of IS_ERR_VALUE abuses	2016-05-27 15:26:11 -07:00
pid_namespace.c	Merge branch 'nsfs-ioctls' into HEAD	2016-09-22 20:00:36 -05:00
profile.c	profile: Convert to hotplug state machine	2016-07-15 10:41:42 +02:00
ptrace.c	mm: replace access_process_vm() write parameter with gup_flags	2016-10-19 08:31:25 -07:00
range.c	…
reboot.c	…
relay.c	relay: Use irq_work instead of plain timer for deferred wakeup	2016-10-11 15:06:32 -07:00
resource.c	/proc/iomem: only expose physical resource addresses to privileged users	2016-04-14 12:56:09 -07:00
seccomp.c	bpf: drop unnecessary context cast from BPF_PROG_RUN	2016-11-27 20:38:47 -05:00
signal.c	posix-timers: Make them configurable	2016-11-16 09:26:35 +01:00
smp.c	kernel/smp: Tell the user we're bringing up secondary CPUs	2016-10-26 12:02:35 +02:00
smpboot.c	kthread/smpboot: do not park in kthread_create_on_cpu()	2016-10-11 15:06:33 -07:00
smpboot.h	…
softirq.c	softirq: Display IRQ_POLL for irq-poll statistics	2016-10-21 15:45:47 -06:00
stacktrace.c	…
stop_machine.c	locking/core, stop_machine: Yield the CPU during stop machine()	2016-11-16 10:15:09 +01:00
sys.c	Merge branch 'akpm' (patches from Andrew)	2016-12-12 20:50:02 -08:00
sys_ni.c	x86/pkeys: Fix pkeys build breakage for some non-x86 arches	2016-09-13 14:41:36 +02:00
sysctl.c	Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2016-12-12 13:49:57 -08:00
sysctl_binary.c	kernel/sysctl_binary.c: use generic UUID library	2016-05-20 17:58:30 -07:00
task_work.c	task_work: use READ_ONCE/lockless_dereference, avoid pi_lock if !task_works	2016-08-02 19:35:02 -04:00
taskstats.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2016-11-15 10:54:36 -05:00
test_kprobes.c	…
torture.c	torture: Convert torture_shutdown() to hrtimer	2016-08-22 10:01:49 -07:00
tracepoint.c	…
tsacct.c	…
ucount.c	mntns: Add a limit on the number of mount namespaces.	2016-08-31 07:28:35 -05:00
uid16.c	cred: simpler, 1D supplementary groups	2016-10-07 18:46:30 -07:00
up.c	smp: Add function to execute a function synchronously on a CPU	2016-09-05 13:52:39 +02:00
user-return-notifier.c	…
user.c	…
user_namespace.c	Merge branch 'nsfs-ioctls' into HEAD	2016-09-22 20:00:36 -05:00
utsname.c	Merge branch 'nsfs-ioctls' into HEAD	2016-09-22 20:00:36 -05:00
utsname_sysctl.c	…
watchdog.c	kernel/watchdog: use nmi registers snapshot in hardlockup handler	2016-12-14 16:04:07 -08:00
workqueue.c	Merge branch 'for-4.9' into for-4.10	2016-10-19 12:12:40 -04:00
workqueue_internal.h	…