Aaron Tomlin ed235875e2 kernel/watchdog.c: print traces for all cpus on lockup detection ... A 'softlockup' is defined as a bug that causes the kernel to loop in kernel mode for more than a predefined period to time, without giving other tasks a chance to run. Currently, upon detection of this condition by the per-cpu watchdog task, debug information (including a stack trace) is sent to the system log. On some occasions, we have observed that the "victim" rather than the actual "culprit" (i.e. the owner/holder of the contended resource) is reported to the user. Often this information has proven to be insufficient to assist debugging efforts. To avoid loss of useful debug information, for architectures which support NMI, this patch makes it possible to improve soft lockup reporting. This is accomplished by issuing an NMI to each cpu to obtain a stack trace. If NMI is not supported we just revert back to the old method. A sysctl and boot-time parameter is available to toggle this feature. [dzickus@redhat.com: add CONFIG_SMP in certain areas] [akpm@linux-foundation.org: additional CONFIG_SMP=n optimisations] [mq@suse.cz: fix warning] Signed-off-by: Aaron Tomlin <atomlin@redhat.com> Signed-off-by: Don Zickus <dzickus@redhat.com> Cc: David S. Miller <davem@davemloft.net> Cc: Mateusz Guzik <mguzik@redhat.com> Cc: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Jan Moskyto Matejka <mq@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2014-06-23 16:47:44 -07:00
..
debug	kernel/printk: use symbolic defines for console loglevels	2014-06-04 16:54:17 -07:00
events	Merge branch 'perf/core' into perf/urgent, to pick up the latest fixes	2014-06-14 14:10:08 +02:00
gcov	gcov: add support for GCC 4.9	2014-06-10 15:34:46 -07:00
irq	genirq: Improve documentation to match current implementation	2014-05-27 10:16:44 +02:00
locking	Merge branch 'locking-urgent-for-linus.patch' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-06-21 07:06:02 -10:00
power	x86, kaslr: boot-time selectable with hibernation	2014-06-16 23:30:44 +02:00
printk	kernel/printk: use symbolic defines for console loglevels	2014-06-04 16:54:17 -07:00
rcu	Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into next	2014-06-03 12:57:53 -07:00
sched	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-06-12 19:42:15 -07:00
time	Merge branch 'akpm' (patchbomb from Andrew) into next	2014-06-04 16:55:13 -07:00
trace	One bug fix that goes back to 3.10. Accessing a non existent buffer	2014-06-12 21:07:25 -07:00
.gitignore	…
Kconfig.freezer	…
Kconfig.hz	…
Kconfig.locks	locking/rwlocks: Introduce 'qrwlocks' - fair, queued rwlocks	2014-06-06 07:58:28 +02:00
Kconfig.preempt	…
Makefile	Merge branch 'x86-asmlinkage-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-03-31 14:13:25 -07:00
acct.c	ipc, kernel: clear whitespace	2014-06-06 16:08:14 -07:00
async.c	…
audit.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2014-06-12 14:27:40 -07:00
audit.h	audit: Use struct net not pid_t to remember the network namespce to reply in	2014-03-20 10:10:53 -04:00
audit_tree.c	…
audit_watch.c	…
auditfilter.c	Merge git://git.infradead.org/users/eparis/audit	2014-04-12 12:38:53 -07:00
auditsc.c	auditsc: audit_krule mask accesses need bounds checking	2014-06-10 08:44:40 -07:00
backtracetest.c	kernel/backtracetest.c: replace no level printk by pr_info()	2014-06-04 16:54:14 -07:00
bounds.c	…
capability.c	fs,userns: Change inode_capable to capable_wrt_inode_uidgid	2014-06-10 13:57:22 -07:00
cgroup.c	Merge branch 'for-3.16' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup	2014-06-09 15:03:33 -07:00
cgroup_freezer.c	cgroup: remove css_parent()	2014-05-16 13:22:48 -04:00
compat.c	kernel/compat.c: use sizeof() instead of sizeof	2014-06-04 16:54:19 -07:00
configs.c	…
context_tracking.c	x86/kprobes: Fix build errors and blacklist context_track_user	2014-06-14 09:07:44 +02:00
cpu.c	More ACPI and power management updates for 3.16-rc1	2014-06-12 13:14:19 -07:00
cpu_pm.c	…
cpuset.c	Merge branch 'for-3.16' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup	2014-06-09 15:03:33 -07:00
crash_dump.c	…
cred.c	…
delayacct.c	…
dma.c	…
elfcore.c	…
exec_domain.c	kernel/exec_domain.c: code clean-up	2014-06-04 16:54:15 -07:00
exit.c	signals: mv {dis,}allow_signal() from sched.h/exit.c to signal.[ch]	2014-06-06 16:08:11 -07:00
extable.c	…
fork.c	ptrace: fix fork event messages across pid namespaces	2014-06-06 16:08:11 -07:00
freezer.c	…
futex.c	Merge branch 'next' (accumulated 3.16 merge window patches) into master	2014-06-08 11:31:16 -07:00
futex_compat.c	…
groups.c	kernel/groups.c: remove return value of set_groups	2014-04-03 16:21:05 -07:00
hrtimer.c	Merge branch 'perf/urgent' into perf/core, to resolve conflict and to prepare for new patches	2014-06-06 07:55:06 +02:00
hung_task.c	kernel/hung_task.c: convert simple_strtoul to kstrtouint	2014-06-04 16:54:15 -07:00
irq_work.c	perf/x86: Warn to early_printk() in case irq_work is too slow	2014-02-21 21:49:07 +01:00
itimer.c	…
jump_label.c	…
kallsyms.c	kernel: use macros from compiler.h instead of __attribute__((...))	2014-04-07 16:36:11 -07:00
kcmp.c	…
kexec.c	kexec: save PG_head_mask in VMCOREINFO	2014-06-23 16:47:43 -07:00
kmod.c	signals: change wait_for_helper() to use kernel_sigaction()	2014-06-06 16:08:12 -07:00
kprobes.c	kprobes: Show blacklist entries via debugfs	2014-04-24 10:26:41 +02:00
ksysfs.c	kobject: Make support for uevent_helper optional.	2014-04-25 12:00:49 -07:00
kthread.c	kthread: fix return value of kthread_create() upon SIGKILL.	2014-06-04 16:53:51 -07:00
latencytop.c	kernel/latencytop.c: convert seq_printf to seq_puts	2014-06-04 16:54:15 -07:00
module-internal.h	…
module.c	Most of this is cleaning up various driver sysfs permissions so we can	2014-06-11 16:09:14 -07:00
module_signing.c	…
notifier.c	kprobes, notifier: Use NOKPROBE_SYMBOL macro in notifier	2014-04-24 10:26:39 +02:00
nsproxy.c	…
padata.c	…
panic.c	kernel/panic.c: add "crash_kexec_post_notifiers" option for kdump after panic_notifers	2014-06-06 16:08:12 -07:00
params.c	param: hand arguments after -- straight to init	2014-04-28 11:48:34 +09:30
pid.c	…
pid_namespace.c	pid_namespace: pidns_get() should check task_active_pid_ns() != NULL	2014-04-02 16:20:21 -07:00
posix-cpu-timers.c	…
posix-timers.c	…
profile.c	kernel/profile.c: use static const char instead of static char	2014-06-06 16:08:13 -07:00
ptrace.c	kernel/compat: convert to COMPAT_SYSCALL_DEFINE	2014-03-06 15:35:10 +01:00
range.c	…
reboot.c	kernel/reboot.c: convert simple_strtoul to kstrtoint	2014-06-04 16:54:15 -07:00
relay.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2014-04-12 14:49:50 -07:00
res_counter.c	kernel/res_counter.c: replace simple_strtoull by kstrtoull	2014-06-04 16:54:15 -07:00
resource.c	resources: Clarify sanity check message	2014-05-23 10:47:21 -06:00
seccomp.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2014-06-12 14:27:40 -07:00
signal.c	signals: introduce kernel_sigaction()	2014-06-06 16:08:12 -07:00
smp.c	CPU hotplug, smp: flush any pending IPI callbacks before CPU offline	2014-06-23 16:47:43 -07:00
smpboot.c	…
smpboot.h	…
softirq.c	Merge branch 'rcu/next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu	2014-05-22 11:36:10 +02:00
stacktrace.c	…
stop_machine.c	kernel/stop_machine.c: kernel-doc warning fix	2014-06-04 16:54:15 -07:00
sys.c	sched: Consolidate open coded implementations of nice level frobbing into nice_to_rlimit() and rlimit_to_nice()	2014-05-22 11:16:36 +02:00
sys_ni.c	sys_sgetmask/sys_ssetmask: add CONFIG_SGETMASK_SYSCALL	2014-06-04 16:54:14 -07:00
sysctl.c	kernel/watchdog.c: print traces for all cpus on lockup detection	2014-06-23 16:47:44 -07:00
sysctl_binary.c	…
system_certificates.S	…
system_keyring.c	…
task_work.c	…
taskstats.c	…
test_kprobes.c	…
time.c	…
timeconst.bc	…
timer.c	timer: Prevent overflow in apply_slack	2014-04-30 13:46:17 +02:00
torture.c	torture: Remove __init from torture_init_begin/end	2014-05-14 09:46:30 -07:00
tracepoint.c	kernel/tracepoint.c: kernel-doc fixes	2014-06-04 16:54:15 -07:00
tsacct.c	…
uid16.c	…
up.c	smp: Rename __smp_call_function_single() to smp_call_function_single_async()	2014-02-24 14:47:15 -08:00
user-return-notifier.c	…
user.c	kernel/user.c: drop unused field 'files' from user_struct	2014-06-04 16:54:16 -07:00
user_namespace.c	kernel/user_namespace.c: kernel-doc/checkpatch fixes	2014-06-06 16:08:13 -07:00
utsname.c	…
utsname_sysctl.c	sysctl: convert use of typedef ctl_table to struct ctl_table	2014-06-06 16:08:16 -07:00
watchdog.c	kernel/watchdog.c: print traces for all cpus on lockup detection	2014-06-23 16:47:44 -07:00
workqueue.c	Merge branch 'for-3.16' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq	2014-06-09 14:56:49 -07:00
workqueue_internal.h	workqueue: rename manager_mutex to attach_mutex	2014-05-20 10:59:32 -04:00