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Rik van Riel 7053ea1a34 stop_machine: Fix race between stop_two_cpus() and stop_cpus() 
There is a race between stop_two_cpus, and the global stop_cpus.

It is possible for two CPUs to get their stopper functions queued
"backwards" from one another, resulting in the stopper threads
getting stuck, and the system hanging. This can happen because
queuing up stoppers is not synchronized.

This patch adds synchronization between stop_cpus (a rare operation),
and stop_two_cpus.

Reported-and-Tested-by: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Mel Gorman <mgorman@suse.de>
Link: http://lkml.kernel.org/r/20131101104146.03d1e043@annuminas.surriel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2013-11-11 12:43:38 +01:00
..
cpu
sched: Add NEED_RESCHED to the preempt_count
2013-09-25 14:07:49 +02:00
debug
kgdb/sysrq: fix inconstistent help message of sysrq key
2013-04-30 17:04:10 -07:00
events
perf: Disable PERF_RECORD_MMAP2 support
2013-10-17 16:27:14 -03:00
gcov
kernel: replace strict_strto*() with kstrto*()
2013-09-12 15:38:03 -07:00
irq
Remove GENERIC_HARDIRQ config option
2013-09-13 15:09:52 +02:00
power
PM / hibernate: Move software_resume to late_initcall_sync
2013-10-25 01:58:49 +02:00
printk
TTY/Serial driver patches for 3.12-rc1
2013-09-03 11:38:36 -07:00
sched
sched: Remove unnecessary iteration over sched domains to update nr_busy_cpus
2013-11-06 12:37:55 +01:00
time
clockevents: Sanitize ticks to nsec conversion
2013-10-23 12:51:21 +02:00
trace
Not much changes for the 3.12 merge window. The major tracing changes
2013-09-09 14:42:15 -07:00
.gitignore
kernel/hz.bc: ignore.
2013-04-22 07:09:06 -07:00
acct.c
fs: Fix hang with BSD accounting on frozen filesystem
2013-05-04 14:57:58 -04:00
async.c
async: rename and redefine async_func_ptr
2013-03-12 13:59:14 -07:00
audit_tree.c
kernel/audit_tree.c:audit_add_tree_rule(): protect `rule' from kill_rules()
2013-06-12 16:29:46 -07:00
audit_watch.c
audit: catch possible NULL audit buffers
2013-01-11 14:54:55 -08:00
audit.c
audit: fix endless wait in audit_log_start()
2013-09-24 17:00:26 -07:00
audit.h
audit: fix mq_open and mq_unlink to add the MQ root as a hidden parent audit_names record
2013-07-09 10:33:19 -07:00
auditfilter.c
audit: Fix decimal constant description
2013-07-09 10:33:19 -07:00
auditsc.c
audit: fix mq_open and mq_unlink to add the MQ root as a hidden parent audit_names record
2013-07-09 10:33:19 -07:00
backtracetest.c
…
bounds.c
mm: numa: Change page last {nid,pid} into {cpu,pid}
2013-10-09 14:47:45 +02:00
capability.c
xfs: update for v3.12-rc1
2013-09-09 11:19:09 -07:00
cgroup_freezer.c
cgroup: make css_for_each_descendant() and friends include the origin css in the iteration
2013-08-08 20:11:27 -04:00
cgroup.c
Merge branch 'for-3.12-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
2013-10-22 08:20:34 +01:00
compat.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal
2013-05-01 07:21:43 -07:00
configs.c
proc: Supply PDE attribute setting accessor functions
2013-05-01 17:29:18 -04:00
context_tracking.c
Linux 3.12-rc4
2013-10-09 12:36:13 +02:00
cpu_pm.c
kernel/cpu_pm.c: fix various typos
2012-05-31 17:49:27 -07:00
cpu.c
sched: Remove get_online_cpus() usage
2013-10-16 14:22:16 +02:00
cpuset.c
Merge branch 'for-3.12' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
2013-09-03 18:25:03 -07:00
crash_dump.c
…
cred.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2012-12-18 10:55:28 -08:00
delayacct.c
cputime: Use accessors to read task cputime stats
2013-01-27 19:23:31 +01:00
dma.c
Remove all #inclusions of asm/system.h
2012-03-28 18:30:03 +01:00
elfcore.c
…
exec_domain.c
…
exit.c
ptrace: revert "Prepare to fix racy accesses on task breakpoints"
2013-07-09 10:33:26 -07:00
extable.c
extable: skip sorting if the table is empty
2013-09-11 15:58:25 -07:00
fork.c
sched/numa: Stay on the same node if CLONE_VM
2013-10-09 14:47:57 +02:00
freezer.c
freezer: set PF_SUSPEND_TASK flag on tasks that call freeze_processes
2013-07-30 14:05:06 +02:00
futex_compat.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal
2013-02-23 18:50:11 -08:00
futex.c
futex: Use freezable blocking call
2013-06-25 23:11:19 +02:00
groups.c
userns: Kill nsown_capable it makes the wrong thing easy
2013-08-30 23:44:11 -07:00
hrtimer.c
kernel: delete __cpuinit usage from all core kernel files
2013-07-14 19:36:59 -04:00
hung_task.c
hung_task debugging: Print more info when reporting the problem
2013-08-02 11:02:42 +02:00
irq_work.c
Merge branch 'nohz/printk-v8' into irq/core
2013-02-05 00:48:46 +01:00
itimer.c
itimer: Use printk_once instead of WARN_ONCE
2012-04-10 11:00:30 +02:00
jump_label.c
jump_label: Split jumplabel ratelimit
2013-08-09 07:53:54 -07:00
kallsyms.c
kernel: kallsyms: memory override issue, need check destination buffer length
2013-04-15 15:17:26 +09:30
kcmp.c
kcmp: include linux/ptrace.h
2012-12-20 17:40:19 -08:00
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.locks
locking: Fix copy/paste errors of "ARCH_INLINE_*_UNLOCK_BH"
2013-05-28 08:50:00 +02:00
Kconfig.preempt
locking/kconfig: Simplify INLINE_SPIN_UNLOCK usage
2012-03-23 13:18:57 +01:00
kexec.c
kexec: remove unnecessary return
2013-09-11 15:59:10 -07:00
kmod.c
kernel/kmod.c: check for NULL in call_usermodehelper_exec()
2013-09-30 14:31:02 -07:00
kprobes.c
kprobes: allow to specify custom allocator for insn caches
2013-09-11 15:58:52 -07:00
ksysfs.c
kernel: replace strict_strto*() with kstrto*()
2013-09-12 15:38:03 -07:00
kthread.c
kthread: implement probe_kthread_data()
2013-04-30 17:04:02 -07:00
latencytop.c
…
lglock.c
lglock: Update lockdep annotations to report recursive local locks
2013-07-12 13:51:19 +02:00
lockdep_internals.h
…
lockdep_proc.c
lockdep: Use KSYM_NAME_LEN'ed buffer for __get_key_name()
2012-10-24 12:39:09 +02:00
lockdep_states.h
…
lockdep.c
lockdep: remove task argument from debug_check_no_locks_held
2013-05-12 14:16:21 +02:00
Makefile
sched: Move wait.c into kernel/sched/
2013-11-06 07:49:16 +01:00
modsign_certificate.S
CONFIG_SYMBOL_PREFIX: cleanup.
2013-03-15 15:09:43 +10:30
modsign_pubkey.c
kernel/modsign_pubkey.c: fix init const for module signing code
2013-09-11 15:58:21 -07:00
module_signing.c
MODSIGN: Don't use enum-type bitfields in module signature info block
2012-12-05 11:27:24 +10:30
module-internal.h
MODSIGN: Move the magic string to the end of a module and eliminate the search
2012-10-19 17:30:40 -07:00
module.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2013-09-05 08:50:26 -07:00
mutex-debug.c
…
mutex-debug.h
…
mutex.c
mutex: Avoid gcc version dependent __builtin_constant_p() usage
2013-10-18 21:58:54 +02:00
mutex.h
…
notifier.c
…
nsproxy.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2013-09-07 14:35:32 -07:00
padata.c
padata - Register hotcpu notifier after initialization
2013-08-29 14:37:59 +10:00
panic.c
panic: call panic handlers before kmsg_dump
2013-09-11 15:59:30 -07:00
params.c
kernel/params: fix handling of signed integer types
2013-09-28 12:35:52 -07:00
pid_namespace.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2013-09-07 14:35:32 -07:00
pid.c
pidns: fix free_pid() to handle the first fork failure
2013-09-30 14:31:03 -07:00
posix-cpu-timers.c
posix_timers: fix racy timer delta caching on task exit
2013-07-03 16:54:42 +02:00
posix-timers.c
posix-timers: Remove unused variable
2013-04-18 12:51:19 +02:00
profile.c
kernel: delete __cpuinit usage from all core kernel files
2013-07-14 19:36:59 -04:00
ptrace.c
__ptrace_may_access() should not deny sub-threads
2013-09-11 15:59:01 -07:00
range.c
range: Do not add new blank slot with add_range_with_merge
2013-06-18 11:32:10 -05:00
rcu.h
rcu: Make call_rcu() leak callbacks for debug-object errors
2013-08-18 17:40:03 -07:00
rcupdate.c
Not much changes for the 3.12 merge window. The major tracing changes
2013-09-09 14:42:15 -07:00
rcutiny_plugin.h
rcu: Add const annotation to char * for RCU tracepoints and functions
2013-07-29 17:07:49 -04:00
rcutiny.c
rcu: Add const annotation to char * for RCU tracepoints and functions
2013-07-29 17:07:49 -04:00
rcutorture.c
rcu: Make rcutorture emit online failures if verbose
2013-08-20 11:38:45 -07:00
rcutree_plugin.h
nohz_full: Force RCU's grace-period kthreads onto timekeeping CPU
2013-08-31 14:44:02 -07:00
rcutree_trace.c
rcutrace: single_open() leaks
2013-05-05 00:16:35 -04:00
rcutree.c
sched, rcu: Make RCU use resched_cpu()
2013-09-25 13:53:08 +02:00
rcutree.h
nohz_full: Force RCU's grace-period kthreads onto timekeeping CPU
2013-08-31 14:44:02 -07:00
reboot.c
kernel/reboot.c: re-enable the function of variable reboot_default
2013-09-24 17:00:26 -07:00
relay.c
kernel: delete __cpuinit usage from all core kernel files
2013-07-14 19:36:59 -04:00
res_counter.c
memcg: reduce function dereference
2013-09-12 15:38:02 -07:00
resource.c
kernel/resource.c: remove the unneeded assignment in function __find_resource
2013-07-03 16:08:06 -07:00
rtmutex_common.h
…
rtmutex-debug.c
sched/rt: Move rt specific bits into new header file
2013-02-07 20:51:08 +01:00
rtmutex-debug.h
…
rtmutex-tester.c
locking/rtmutex/tester: Set correct permissions on sysfs files
2013-04-10 14:48:37 +02:00
rtmutex.c
rtmutex: Document rt_mutex_adjust_prio_chain()
2013-05-28 09:23:52 +02:00
rtmutex.h
…
rwsem.c
Revert "rw_semaphore: remove up/down_read_non_owner"
2013-03-23 15:53:52 -07:00
seccomp.c
seccomp: allow BPF_XOR based ALU instructions.
2013-03-26 11:07:19 +11:00
semaphore.c
semaphore: use `bool' type for semaphore_waiter's up
2013-04-30 17:04:08 -07:00
signal.c
kernel-wide: fix missing validations on __get/__put/__copy_to/__copy_from_user()
2013-09-11 15:58:18 -07:00
smp.c
kernel/smp.c: quit unconditionally enabling irqs in on_each_cpu_mask().
2013-09-11 15:58:25 -07:00
smpboot.c
kernel: delete __cpuinit usage from all core kernel files
2013-07-14 19:36:59 -04:00
smpboot.h
smpboot: Provide infrastructure for percpu hotplug threads
2012-08-13 17:01:07 +02:00
softirq.c
Linux 3.12-rc4
2013-10-09 12:36:13 +02:00
spinlock.c
kernel/spinlock.c: add default arch_*_relax definitions for GENERIC_LOCKBREAK
2013-09-11 15:58:21 -07:00
srcu.c
srcu: use ACCESS_ONCE() to access sp->completed in srcu_read_lock()
2013-02-07 15:19:36 -08:00
stacktrace.c
…
stop_machine.c
stop_machine: Fix race between stop_two_cpus() and stop_cpus()
2013-11-11 12:43:38 +01:00
sys_ni.c
unify compat fanotify_mark(2), switch to COMPAT_SYSCALL_DEFINE
2013-05-09 13:46:38 -04:00
sys.c
userns: Kill nsown_capable it makes the wrong thing easy
2013-08-30 23:44:11 -07:00
sysctl_binary.c
kernel: remove unnecessary head file
2013-06-26 18:01:46 +09:00
sysctl.c
sched/numa: Skip some page migrations after a shared fault
2013-10-09 14:48:21 +02:00
task_work.c
task_work: documentation
2013-09-11 15:58:27 -07:00
taskstats.c
taskstats: cgroupstats_user_cmd() may leak on error
2012-10-06 03:05:31 +09:00
test_kprobes.c
kernel/: rename random32() to prandom_u32()
2013-04-29 18:28:42 -07:00
time.c
sched: Rename sched.c as sched/core.c in comments and Documentation
2013-06-19 12:58:42 +02:00
timeconst.bc
kernel: Replace timeconst.pl with a bc script
2013-02-16 23:17:25 +01:00
timer.c
sched: Introduce preempt_count accessor functions
2013-09-25 14:07:32 +02:00
tracepoint.c
Tracing updates for Linux 3.10
2013-04-29 13:55:38 -07:00
tsacct.c
cputime: Use accessors to read task cputime stats
2013-01-27 19:23:31 +01:00
uid16.c
userns: Kill nsown_capable it makes the wrong thing easy
2013-08-30 23:44:11 -07:00
up.c
smp.h: move !SMP version of on_each_cpu() out-of-line
2013-09-11 15:58:25 -07:00
user_namespace.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2013-09-07 14:35:32 -07:00
user-return-notifier.c
hlist: drop the node parameter from iterators
2013-02-27 19:10:24 -08:00
user.c
userns: Better restrictions on when proc and sysfs can be mounted
2013-08-26 19:17:03 -07:00
utsname_sysctl.c
kernel/utsname_sysctl.c: put get/get_uts() into CONFIG_PROC_SYSCTL code block
2013-02-27 19:10:22 -08:00
utsname.c
userns: Kill nsown_capable it makes the wrong thing easy
2013-08-30 23:44:11 -07:00
watchdog.c
watchdog: update watchdog_thresh properly
2013-09-24 17:00:25 -07:00
workqueue_internal.h
sched: Rename sched.c as sched/core.c in comments and Documentation
2013-06-19 12:58:42 +02:00
workqueue.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2013-09-06 09:36:28 -07:00