Repository files (latest commit first)

Filename	Latest commit message	Latest commit date
Heiko Carstens 27c379f7f8 generic-ipi: Fix deadlock in __smp_call_function_single ... Just got my 6 way machine to a state where cpu 0 is in an endless loop within __smp_call_function_single. All other cpus are idle. The call trace on cpu 0 looks like this: __smp_call_function_single scheduler_tick update_process_times tick_sched_timer __run_hrtimer hrtimer_interrupt clock_comparator_work do_extint ext_int_handler ----> timer irq cpu_idle __smp_call_function_single() got called from nohz_balancer_kick() (inlined) with the remote cpu being 1, wait being 0 and the per cpu variable remote_sched_softirq_cb (call_single_data) of the current cpu (0). Then it loops forever when it tries to grab the lock of the call_single_data, since it is already locked and enqueued on cpu 0. My theory how this could have happened: for some reason the scheduler decided to call __smp_call_function_single() on it's own cpu, and sends an IPI to itself. The interrupt stays pending since IRQs are disabled. If then the hypervisor schedules the cpu away it might happen that upon rescheduling both the IPI and the timer IRQ are pending. If then interrupts are enabled again it depends which one gets scheduled first. If the timer interrupt gets delivered first we end up with the local deadlock as seen in the calltrace above. Let's make __smp_call_function_single() check if the target cpu is the current cpu and execute the function immediately just like smp_call_function_single does. That should prevent at least the scenario described here. It might also be that the scheduler is not supposed to call __smp_call_function_single with the remote cpu being the current cpu, but that is a different issue. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Jens Axboe <jaxboe@fusionio.com> Cc: Venkatesh Pallipadi <venki@google.com> Cc: Suresh Siddha <suresh.b.siddha@intel.com> LKML-Reference: <20100910114729.GB2827@osiris.boeblingen.de.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>		2010-09-10 16:48:40 +02:00
..
debug	Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2010-09-08 11:13:42 -07:00
gcov	gcov: fix null-pointer dereference for certain module types	2010-09-09 18:57:23 -07:00
irq	irq: Add new IRQ flag IRQF_NO_SUSPEND	2010-07-29 13:24:57 +02:00
power	swap: revert special hibernation allocation	2010-09-09 18:57:25 -07:00
time	time: Workaround gcc loop optimization that causes 64bit div errors	2010-08-13 12:03:24 -07:00
trace	Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2010-09-08 11:13:42 -07:00
.gitignore
acct.c	pass a struct path to vfs_statfs	2010-08-09 16:48:42 -04:00
async.c	async: use workqueue for worker pool	2010-07-14 11:29:46 +02:00
audit.c	Merge branch 'for-linus' of git://git.infradead.org/users/eparis/notify	2010-08-10 11:39:13 -07:00
audit.h	Audit: split audit watch Kconfig	2010-07-28 09:58:19 -04:00
audit_tree.c	fanotify: use both marks when possible	2010-07-28 10:18:55 -04:00
audit_watch.c	Revert "fsnotify: store struct file not struct path"	2010-08-12 14:23:04 -07:00
auditfilter.c	audit: do not get and put just to free a watch	2010-07-28 09:58:17 -04:00
auditsc.c	vfs: add helpers to get root and pwd	2010-08-11 00:28:20 -04:00
backtracetest.c
bounds.c	kbuild: move bounds.h to include/generated	2009-12-12 13:08:14 +01:00
capability.c	sched: Remove remaining USER_SCHED code	2010-04-02 20:12:00 +02:00
cgroup.c	cgroups: fix API thinko	2010-09-09 18:57:23 -07:00
cgroup_freezer.c	Freezer / cgroup freezer: Update stale locking comments	2010-05-10 23:18:47 +02:00
compat.c	rlimits: switch more rlimit syscalls to do_prlimit	2010-07-16 09:48:48 +02:00
configs.c
cpu.c	sched: adjust when cpu_active and cpuset configurations are updated during cpu on/offlining	2010-06-08 21:40:36 +02:00
cpuset.c	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2010-08-06 09:39:22 -07:00
cred.c	Add a dummy printk function for the maintenance of unused printks	2010-08-12 09:51:35 -07:00
delayacct.c
dma.c
early_res.c	kmemleak: Add support for NO_BOOTMEM configurations	2010-07-19 11:54:15 +01:00
elfcore.c	elf coredump: add extended numbering support	2010-03-06 11:26:46 -08:00
exec_domain.c	sys_personality: remove the bogus checks in sys_personality()->__set_personality() path	2010-08-09 20:45:05 -07:00
exit.c	Fix unprotected access to task credentials in waitid()	2010-08-17 18:07:43 -07:00
extable.c
fork.c	mm: make the vma list be doubly linked	2010-08-21 08:49:21 -07:00
freezer.c
futex.c	futex: futex_find_get_task remove credentails check	2010-06-30 15:43:44 -07:00
futex_compat.c	futex: Protect pid lookup in compat code with RCU	2009-12-09 14:22:14 +01:00
groups.c	kernel/groups.c: fix integer overflow in groups_search	2010-09-09 18:57:24 -07:00
hrtimer.c	gcc-4.6: kernel/*: Fix unused but set warnings	2010-09-05 14:36:58 +02:00
hung_task.c
hw_breakpoint.c	Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2010-08-06 09:30:52 -07:00
itimer.c
kallsyms.c	kdb: core for kgdb back end (2 of 2)	2010-05-20 21:04:21 -05:00
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kexec.c	kexec: return -EFAULT on copy_to_user() failures	2010-08-11 08:59:22 -07:00
kfifo.c	kfifo: implement missing __kfifo_skip_r()	2010-08-20 09:34:54 -07:00
kmod.c	Make do_execve() take a const filename pointer	2010-08-17 18:07:43 -07:00
kprobes.c	kprobes: Move enable/disable_kprobe() out from debugfs code	2010-05-08 18:08:30 +02:00
ksysfs.c	sysfs: add struct file* to bin_attr callbacks	2010-05-21 09:37:31 -07:00
kthread.c	kthread: implement kthread_data()	2010-06-29 10:07:09 +02:00
latencytop.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
lockdep.c	sched_clock: Add local_clock() API and improve documentation	2010-06-09 10:34:49 +02:00
lockdep_internals.h	lockdep: No need to disable preemption in debug atomic ops	2010-05-04 05:38:16 +02:00
lockdep_proc.c	lockstat: Make lockstat counting per cpu	2010-04-06 00:15:37 +02:00
lockdep_states.h
Makefile	Merge branch 'for-linus' of git://git.infradead.org/users/eparis/notify	2010-08-10 11:39:13 -07:00
module.c	module: cleanup comments, remove noinline	2010-08-05 12:59:13 +09:30
mutex-debug.c
mutex-debug.h	locking: Implement new raw_spinlock	2009-12-14 23:55:32 +01:00
mutex.c	mutex: Fix annotations to include it in kernel-locking docbook	2010-09-03 08:19:51 +02:00
mutex.h
notifier.c	sched: Use lockdep-based checking on rcu_dereference()	2010-02-25 10:34:26 +01:00
ns_cgroup.c
nsproxy.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
padata.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2010-08-04 15:23:14 -07:00
panic.c	lib/bug.c: add oops end marker to WARN implementation	2010-08-11 08:59:22 -07:00
params.c	param: locking for kernel parameters	2010-08-11 23:04:20 +09:30
perf_event.c	perf_events: Fix time tracking for events with pid != -1 and cpu != -1	2010-08-30 12:16:55 +02:00
pid.c	pids: alloc_pidmap: remove the unnecessary boundary checks	2010-08-11 08:59:20 -07:00
pid_namespace.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
pm_qos_params.c	PM QoS: Fix inline documentation.	2010-08-26 20:18:43 +02:00
posix-cpu-timers.c	Merge branch 'writable_limits' of git://decibel.fi.muni.cz/~xslaby/linux	2010-08-10 12:07:51 -07:00
posix-timers.c	posix_timer: Move copy_to_user(created_timer_id) down in timer_create()	2010-07-23 15:08:12 +02:00
printk.c	gcc-4.6: printk: use stable variable to dump kmsg buffer	2010-08-09 20:45:06 -07:00
profile.c	numa: in-kernel profiling: use cpu_to_mem() for per cpu allocations	2010-05-27 09:12:57 -07:00
ptrace.c	ptrace: optimize exit_ptrace() for the likely case	2010-08-11 08:59:19 -07:00
range.c	kernel/range: remove unused definition of ARRAY_SIZE()	2010-08-09 20:45:06 -07:00
rcupdate.c	tree/tiny rcu: Add debug RCU head objects	2010-06-14 16:37:26 -07:00
rcutiny.c	tree/tiny rcu: Add debug RCU head objects	2010-06-14 16:37:26 -07:00
rcutiny_plugin.h	rcu: slim down rcutiny by removing rcu_scheduler_active and friends	2010-05-10 11:08:34 -07:00
rcutorture.c	sched_clock: Add local_clock() API and improve documentation	2010-06-09 10:34:49 +02:00
rcutree.c	tree/tiny rcu: Add debug RCU head objects	2010-06-14 16:37:26 -07:00
rcutree.h	rcu: reduce the number of spurious RCU_SOFTIRQ invocations	2010-05-10 11:08:35 -07:00
rcutree_plugin.h	rcu: remove all rcu head initializations, except on_stack initializations	2010-05-11 16:10:47 -07:00
rcutree_trace.c	rcu: reduce the number of spurious RCU_SOFTIRQ invocations	2010-05-10 11:08:35 -07:00
relay.c	kernel/: convert cpu notifier to return encapsulate errno value	2010-05-27 09:12:48 -07:00
res_counter.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
resource.c	resource: shared I/O region support	2010-05-11 12:01:10 -07:00
rtmutex-debug.c	sched: Convert pi_lock to raw_spinlock	2009-12-14 23:55:33 +01:00
rtmutex-debug.h
rtmutex-tester.c
rtmutex.c	rtmutes: Convert rtmutex.lock to raw_spinlock	2009-12-14 23:55:33 +01:00
rtmutex.h
rtmutex_common.h
rwsem.c
sched.c	mutex: Improve the scalability of optimistic spinning	2010-08-23 10:56:27 +02:00
sched_clock.c	sched_clock: Add local_clock() API and improve documentation	2010-06-09 10:34:49 +02:00
sched_cpupri.c	sched: No need for bootmem special cases	2010-07-17 12:06:22 +02:00
sched_cpupri.h	sched: No need for bootmem special cases	2010-07-17 12:06:22 +02:00
sched_debug.c	sched: Use correct macro to display sched_child_runs_first in /proc/sched_debug	2010-07-21 21:46:12 +02:00
sched_fair.c	gcc-4.6: kernel/*: Fix unused but set warnings	2010-09-05 14:36:58 +02:00
sched_features.h	sched: Remove ASYM_GRAN feature	2010-03-11 18:32:53 +01:00
sched_idletask.c	sched: Cure load average vs NO_HZ woes	2010-04-23 11:02:02 +02:00
sched_rt.c	sched: task_tick_rt: Remove the obsolete ->signal != NULL check	2010-06-18 10:46:56 +02:00
sched_stats.h	sched: Remove the obsolete exit_state/signal hacks	2010-06-18 10:46:56 +02:00
seccomp.c
semaphore.c
signal.c	CRED: Fix RCU warning due to previous patch fixing __task_cred()'s checks	2010-08-04 11:17:10 -07:00
smp.c	generic-ipi: Fix deadlock in __smp_call_function_single	2010-09-10 16:48:40 +02:00
softirq.c	kernel/: fix BUG_ON checks for cpu notifier callbacks direct call	2010-06-04 15:21:45 -07:00
spinlock.c	locking: Cleanup the name space completely	2009-12-14 23:55:33 +01:00
srcu.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
stacktrace.c
stop_machine.c	stop_machine: struct cpu_stopper, remove alignment padding on 64 bits	2010-08-09 20:45:06 -07:00
sys.c	pid: make setpgid() system call use RCU read-side critical section	2010-08-31 17:00:18 -07:00
sys_ni.c	fanotify: sys_fanotify_mark declartion	2010-07-28 09:58:55 -04:00
sysctl.c	gcc-4.6: kernel/*: Fix unused but set warnings	2010-09-05 14:36:58 +02:00
sysctl_binary.c	sysctl: don't use own implementation of hex_to_bin()	2010-05-25 08:07:05 -07:00
sysctl_check.c
taskstats.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
test_kprobes.c
time.c	time: Kill off CONFIG_GENERIC_TIME	2010-07-27 12:40:54 +02:00
timeconst.pl
timer.c	kernel/timer.c: fix kernel-doc function parameter warning	2010-08-10 15:33:09 -07:00
tracepoint.c	tracing: Let tracepoints have data passed to tracepoint callbacks	2010-05-14 09:50:34 -04:00
tsacct.c	mm: clean up mm_counter	2010-03-06 11:26:23 -08:00
uid16.c
up.c
user-return-notifier.c
user.c	sched: Remove a stale comment	2010-05-10 08:48:39 +02:00
user_namespace.c	user_ns: Introduce user_nsmap_uid and user_ns_map_gid.	2010-06-16 14:55:34 -07:00
utsname.c
utsname_sysctl.c
wait.c
watchdog.c	lockup_detector: Sync touch_*_watchdog back to old semantics	2010-09-01 10:02:28 +02:00
workqueue.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq	2010-09-07 14:08:17 -07:00
workqueue_sched.h	workqueue: implement concurrency managed dynamic worker pool	2010-06-29 10:07:14 +02:00