Repository files (latest commit first)

Filename	Latest commit message	Latest commit date
Tejun Heo b22ce2785d workqueue: cond_resched() after processing each work item ... If !PREEMPT, a kworker running work items back to back can hog CPU. This becomes dangerous when a self-requeueing work item which is waiting for something to happen races against stop_machine. Such self-requeueing work item would requeue itself indefinitely hogging the kworker and CPU it's running on while stop_machine would wait for that CPU to enter stop_machine while preventing anything else from happening on all other CPUs. The two would deadlock. Jamie Liu reports that this deadlock scenario exists around scsi_requeue_run_queue() and libata port multiplier support, where one port may exclude command processing from other ports. With the right timing, scsi_requeue_run_queue() can end up requeueing itself trying to execute an IO which is asked to be retried while another device has an exclusive access, which in turn can't make forward progress due to stop_machine. Fix it by invoking cond_resched() after executing each work item. Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: Jamie Liu <jamieliu@google.com> References: http://thread.gmane.org/gmane.linux.kernel/1552567 Cc: stable@vger.kernel.org -- kernel/workqueue.c | 9 +++++++++ 1 file changed, 9 insertions(+)		2013-08-29 09:19:28 -04:00
..
cpu	idle: Enable interrupts in the weak arch_cpu_idle() implementation	2013-06-14 23:01:05 +02:00
debug	kgdb/sysrq: fix inconstistent help message of sysrq key	2013-04-30 17:04:10 -07:00
events	Driver core patches for 3.11-rc2	2013-07-18 12:48:40 -07:00
gcov
irq	Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2013-07-13 15:37:30 -07:00
power	PM / QoS: Fix workqueue deadlock when using pm_qos_update_request_timeout()	2013-08-14 00:42:05 +02:00
printk	printk: Fix return of braille_register_console()	2013-08-06 13:18:12 -07:00
sched	Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2013-08-13 16:58:17 -07:00
time	timer_list: correct the iterator for timer_list	2013-08-28 19:26:38 -07:00
trace	tracing: Fix reset of time stamps during trace_clock changes	2013-08-02 22:40:09 -04:00
.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.c	audit: wait_for_auditd() should use TASK_UNINTERRUPTIBLE	2013-06-12 16:29:45 -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
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
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
capability.c	Add file_ns_capable() helper function for open-time capability checking	2013-04-14 10:06:31 -07:00
cgroup.c	Merge branch 'for-3.11-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup	2013-08-06 13:59:28 -07:00
cgroup_freezer.c
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	Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2013-06-20 08:18:35 -10:00
cpu.c	kernel: delete __cpuinit usage from all core kernel files	2013-07-14 19:36:59 -04:00
cpu_pm.c
cpuset.c	cpuset: fix a regression in validating config change	2013-08-21 08:40:27 -04:00
crash_dump.c
cred.c
delayacct.c
dma.c
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: Flip the sorting message	2013-04-15 13:25:16 +02:00
fork.c	microblaze: fix clone syscall	2013-08-13 17:57:48 -07:00
freezer.c	freezer: set PF_SUSPEND_TASK flag on tasks that call freeze_processes	2013-07-30 14:05:06 +02:00
futex.c	futex: Use freezable blocking call	2013-06-25 23:11:19 +02:00
futex_compat.c
groups.c
hrtimer.c	kernel: delete __cpuinit usage from all core kernel files	2013-07-14 19:36:59 -04:00
hung_task.c
irq_work.c
itimer.c
jump_label.c
kallsyms.c	kernel: kallsyms: memory override issue, need check destination buffer length	2013-04-15 15:17:26 +09:30
kcmp.c
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
kexec.c	kexec: Use min() and min_t() to simplify logic	2013-04-30 17:04:07 -07:00
kmod.c	usermodehelper: kill the sub_info->path[0] check	2013-07-03 16:08:02 -07:00
kprobes.c	kprobes: handle empty/invalid input to debugfs "enabled" file	2013-07-03 16:07:46 -07:00
ksysfs.c
kthread.c	kthread: implement probe_kthread_data()	2013-04-30 17:04:02 -07:00
latencytop.c
lglock.c
lockdep.c	lockdep: remove task argument from debug_check_no_locks_held	2013-05-12 14:16:21 +02:00
lockdep_internals.h
lockdep_proc.c
lockdep_states.h
Makefile	printk: move to separate directory for easier modification	2013-07-31 14:41:03 -07:00
modsign_certificate.S	CONFIG_SYMBOL_PREFIX: cleanup.	2013-03-15 15:09:43 +10:30
modsign_pubkey.c
module-internal.h
module.c	Nothing interesting. Except the most embarrassing bugfix ever. But let's	2013-07-10 14:51:41 -07:00
module_signing.c
mutex-debug.c
mutex-debug.h
mutex.c	mutex: Fix w/w mutex deadlock injection	2013-07-30 22:16:40 +02:00
mutex.h
notifier.c
nsproxy.c	proc: Split the namespace stuff out into linux/proc_ns.h	2013-05-01 17:29:39 -04:00
padata.c
panic.c	The majority of the changes here are cleanups for the large changes that	2013-07-11 09:02:09 -07:00
params.c	There is no /sys/parameters	2013-07-02 15:38:19 +09:30
pid.c	kernel/pid.c: move statement	2013-07-03 16:08:05 -07:00
pid_namespace.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2013-05-01 17:51:54 -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	Revert "ptrace: PTRACE_DETACH should do flush_ptrace_hw_breakpoint(child)"	2013-08-06 13:16:32 -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
rcupdate.c	Merge branches 'cbnum.2013.06.10a', 'doc.2013.06.10a', 'fixes.2013.06.10a', 'srcu.2013.06.10a' and 'tiny.2013.06.10a' into HEAD	2013-06-10 13:46:44 -07:00
rcutiny.c	rcu: Shrink TINY_RCU by reworking CPU-stall ifdefs	2013-06-10 13:45:53 -07:00
rcutiny_plugin.h	rcu: Shrink TINY_RCU by reworking CPU-stall ifdefs	2013-06-10 13:45:53 -07:00
rcutorture.c	rcu: delete __cpuinit usage from all rcu files	2013-07-14 19:36:58 -04:00
rcutree.c	rcu: delete __cpuinit usage from all rcu files	2013-07-14 19:36:58 -04:00
rcutree.h	rcu: delete __cpuinit usage from all rcu files	2013-07-14 19:36:58 -04:00
rcutree_plugin.h	rcu: delete __cpuinit usage from all rcu files	2013-07-14 19:36:58 -04:00
rcutree_trace.c	rcutrace: single_open() leaks	2013-05-05 00:16:35 -04:00
reboot.c	reboot: move arch/x86 reboot= handling to generic kernel	2013-07-09 10:33:29 -07:00
relay.c	kernel: delete __cpuinit usage from all core kernel files	2013-07-14 19:36:59 -04:00
res_counter.c
resource.c	kernel/resource.c: remove the unneeded assignment in function __find_resource	2013-07-03 16:08:06 -07:00
rtmutex-debug.c
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
rtmutex_common.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	sigtimedwait: use freezable blocking call	2013-05-12 14:16:23 +02:00
smp.c	kernel: delete __cpuinit usage from all core kernel files	2013-07-14 19:36:59 -04:00
smpboot.c	kernel: delete __cpuinit usage from all core kernel files	2013-07-14 19:36:59 -04:00
smpboot.h
softirq.c	kernel: delete __cpuinit usage from all core kernel files	2013-07-14 19:36:59 -04:00
spinlock.c
srcu.c
stacktrace.c
stop_machine.c	stop_machine: Mark per cpu stopper enabled early	2013-02-26 22:25:17 +01:00
sys.c	reboot: move shutdown/reboot related functions to kernel/reboot.c	2013-07-09 10:33:29 -07:00
sys_ni.c	unify compat fanotify_mark(2), switch to COMPAT_SYSCALL_DEFINE	2013-05-09 13:46:38 -04:00
sysctl.c	sysctl: range checking in do_proc_dointvec_ms_jiffies_conv	2013-07-26 14:22:10 -07:00
sysctl_binary.c	kernel: remove unnecessary head file	2013-06-26 18:01:46 +09:00
task_work.c
taskstats.c
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
timer.c	kernel: delete __cpuinit usage from all core kernel files	2013-07-14 19:36:59 -04:00
tracepoint.c	Tracing updates for Linux 3.10	2013-04-29 13:55:38 -07:00
tsacct.c
uid16.c	make SYSCALL_DEFINE<n>-generated wrappers do asmlinkage_protect	2013-03-03 22:58:33 -05:00
up.c
user-return-notifier.c	hlist: drop the node parameter from iterators	2013-02-27 19:10:24 -08:00
user.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2013-05-01 17:51:54 -07:00
user_namespace.c	userns: limit the maximum depth of user_namespace->parent chain	2013-08-08 13:11:39 -07:00
utsname.c	proc: Split the namespace stuff out into linux/proc_ns.h	2013-05-01 17:29:39 -04:00
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
wait.c	kernel: fix new kernel-doc warning in wait.c	2013-08-19 09:08:54 -07:00
watchdog.c	watchdog: Boot-disable by default on full dynticks	2013-06-20 15:46:32 +02:00
workqueue.c	workqueue: cond_resched() after processing each work item	2013-08-29 09:19:28 -04:00
workqueue_internal.h	sched: Rename sched.c as sched/core.c in comments and Documentation	2013-06-19 12:58:42 +02:00