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Salman Qazi f13d4f979c hrtimer: Preserve timer state in remove_hrtimer() 
The race is described as follows:

CPU X                                 CPU Y
remove_hrtimer
// state & QUEUED == 0
timer->state = CALLBACK
unlock timer base
timer->f(n) //very long
                                  hrtimer_start
                                    lock timer base
                                    remove_hrtimer // no effect
                                    hrtimer_enqueue
                                    timer->state = CALLBACK |
                                                   QUEUED
                                    unlock timer base
                                  hrtimer_start
                                    lock timer base
                                    remove_hrtimer
                                        mode = INACTIVE
                                        // CALLBACK bit lost!
                                    switch_hrtimer_base
                                            CALLBACK bit not set:
                                                    timer->base
                                                    changes to a
                                                    different CPU.
lock this CPU's timer base

The bug was introduced with commit ca109491f (hrtimer: removing all ur
callback modes) in 2.6.29

[ tglx: Feed new state via local variable and add a comment. ]

Signed-off-by: Salman Qazi <sqazi@google.com>
Cc: akpm@linux-foundation.org
Cc: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <20101012142351.8485.21823.stgit@dungbeetle.mtv.corp.google.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@kernel.org
2010-10-14 13:29:59 +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
Merge branch 'pm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/suspend-2.6
2010-09-11 15:50:53 -07:00
time
time: Workaround gcc loop optimization that causes 64bit div errors
2010-08-13 12:03:24 -07:00
trace
ring-buffer: Fix typo of time extends per page
2010-10-12 12:06:43 -04:00
.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_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
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
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_freezer.c
Freezer / cgroup freezer: Update stale locking comments
2010-05-10 23:18:47 +02:00
cgroup.c
cgroups: fix API thinko
2010-09-09 18:57:23 -07:00
compat.c
compat: Make compat_alloc_user_space() incorporate the access_ok()
2010-09-14 16:08:45 -07:00
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
headers: taskstats_kern.h trim
2009-09-18 09:48:52 -07:00
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
Merge branch 'tracing-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-04-05 11:04:19 -07:00
fork.c
rmap: fix walk during fork
2010-09-22 17:22:39 -07:00
freezer.c
sched: fix nr_uninterruptible accounting of frozen tasks really
2009-07-18 14:19:53 +02:00
futex_compat.c
futex: Protect pid lookup in compat code with RCU
2009-12-09 14:22:14 +01:00
futex.c
futex: futex_find_get_task remove credentails check
2010-06-30 15:43:44 -07:00
groups.c
kernel/groups.c: fix integer overflow in groups_search
2010-09-09 18:57:24 -07:00
hrtimer.c
hrtimer: Preserve timer state in remove_hrtimer()
2010-10-14 13:29:59 +02:00
hung_task.c
softlockup: Fix hung_task_check_count sysctl
2009-11-27 06:21:57 +01:00
hw_breakpoint.c
hw breakpoints: Fix pid namespace bug
2010-09-17 04:42:59 +02:00
itimer.c
itimers: Fix racy writes to cpu_itimer fields
2009-11-18 16:32:12 +01:00
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
mutex: Better control mutex adaptive spinning config
2009-12-03 11:50:11 +01:00
Kconfig.preempt
…
kexec.c
kexec: return -EFAULT on copy_to_user() failures
2010-08-11 08:59:22 -07:00
kfifo.c
kfifo: fix scatterlist usage
2010-10-01 10:50:58 -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_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
lockdep: move state bit definitions around
2009-02-14 23:27:59 +01:00
lockdep.c
sched_clock: Add local_clock() API and improve documentation
2010-06-09 10:34:49 +02:00
Makefile
Merge branch 'for-linus' of git://git.infradead.org/users/eparis/notify
2010-08-10 11:39:13 -07:00
module.c
modules: Fix module_bug_list list corruption race
2010-10-05 11:29:27 -07:00
mutex-debug.c
headers: remove sched.h from interrupt.h
2009-10-11 11:20:58 -07:00
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
mutex: implement adaptive spinning
2009-01-14 18:09:02 +01:00
notifier.c
sched: Use lockdep-based checking on rcu_dereference()
2010-02-25 10:34:26 +01:00
ns_cgroup.c
cgroups: let ss->can_attach and ss->attach do whole threadgroups at a time
2009-09-24 07:20:58 -07:00
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: Fix incorrect copy_from_user() usage
2010-10-12 11:45:01 +02:00
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
pid.c
pids: alloc_pidmap: remove the unnecessary boundary checks
2010-08-11 08:59:20 -07:00
pm_qos_params.c
PM QoS: Correct pr_debug() misuse and improve parameter checks
2010-09-11 00:53:05 +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_plugin.h
rcu: slim down rcutiny by removing rcu_scheduler_active and friends
2010-05-10 11:08:34 -07:00
rcutiny.c
tree/tiny rcu: Add debug RCU head objects
2010-06-14 16:37:26 -07:00
rcutorture.c
sched_clock: Add local_clock() API and improve documentation
2010-06-09 10:34:49 +02:00
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
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
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_common.h
rt_mutex: add proxy lock routines
2009-04-06 11:14:02 +02:00
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
…
rwsem.c
…
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
sched: Fix nohz balance kick
2010-09-21 13:50:50 +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
sched.c
sched: Fix user time incorrectly accounted as system time on 32-bit
2010-09-15 10:41:36 +02:00
seccomp.c
x86-64: seccomp: fix 32/64 syscall hole
2009-03-02 15:41:30 -08:00
semaphore.c
…
signal.c
HWPOISON: Copy si_addr_lsb to user
2010-10-07 09:41:25 +02:00
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_ni.c
fanotify: sys_fanotify_mark declartion
2010-07-28 09:58:55 -04:00
sys.c
pid: make setpgid() system call use RCU read-side critical section
2010-08-31 17:00:18 -07:00
sysctl_binary.c
sysctl: don't use own implementation of hex_to_bin()
2010-05-25 08:07:05 -07:00
sysctl_check.c
ipv4 05/05: add sysctl to accept packets with local source addresses
2009-12-03 12:14:38 -08:00
sysctl.c
sysctl: fix min/max handling in __do_proc_doulongvec_minmax()
2010-10-07 13:31:21 -07:00
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
headers: utsname.h redux
2009-09-23 18:13:10 -07:00
up.c
smp_call_function_single(): be slightly less stupid, fix #2
2009-01-12 16:04:37 +01:00
user_namespace.c
user_ns: Introduce user_nsmap_uid and user_ns_map_gid.
2010-06-16 14:55:34 -07:00
user-return-notifier.c
core: Clean up user return notifers use of per_cpu
2009-12-02 10:22:59 +01:00
user.c
sched: Remove a stale comment
2010-05-10 08:48:39 +02:00
utsname_sysctl.c
sysctl kernel: Remove binary sysctl logic
2009-11-12 02:04:55 -08:00
utsname.c
utsns: extract creeate_uts_ns()
2009-06-18 13:03:55 -07:00
wait.c
locking, sched: Give waitqueue spinlocks their own lockdep classes
2009-08-10 14:43:09 +02:00
watchdog.c
lockup_detector: Sync touch_*_watchdog back to old semantics
2010-09-01 10:02:28 +02:00
workqueue_sched.h
workqueue: implement concurrency managed dynamic worker pool
2010-06-29 10:07:14 +02:00
workqueue.c
workqueue: add documentation
2010-09-13 10:26:52 +02:00