Prateek Sood 47d4272073 cgroup: Fix deadlock in cpu hotplug path ... Deadlock during cgroup migration from cpu hotplug path when a task T is being moved from source to destination cgroup. kworker/0:0 cpuset_hotplug_workfn() cpuset_hotplug_update_tasks() hotplug_update_tasks_legacy() remove_tasks_in_empty_cpuset() cgroup_transfer_tasks() // stuck in iterator loop cgroup_migrate() cgroup_migrate_add_task() In cgroup_migrate_add_task() it checks for PF_EXITING flag of task T. Task T will not migrate to destination cgroup. css_task_iter_start() will keep pointing to task T in loop waiting for task T cg_list node to be removed. Task T do_exit() exit_signals() // sets PF_EXITING exit_task_namespaces() switch_task_namespaces() free_nsproxy() put_mnt_ns() drop_collected_mounts() namespace_unlock() synchronize_rcu() _synchronize_rcu_expedited() schedule_work() // on cpu0 low priority worker pool wait_event() // waiting for work item to execute Task T inserted a work item in the worklist of cpu0 low priority worker pool. It is waiting for expedited grace period work item to execute. This work item will only be executed once kworker/0:0 complete execution of cpuset_hotplug_workfn(). kworker/0:0 ==> Task T ==>kworker/0:0 In case of PF_EXITING task being migrated from source to destination cgroup, migrate next available task in source cgroup. Change-Id: I706aeff24c336c660b5a9b3e5a409c5769968960 Signed-off-by: Prateek Sood <prsood@codeaurora.org>		2018-08-13 23:21:04 -07:00
..
bpf	bpf: map_get_next_key to return first key on NULL	2018-05-16 10:06:46 +02:00
configs	UPSTREAM: config: android-base: disable CONFIG_NFSD and CONFIG_NFS_FS	2018-02-05 08:58:36 -08:00
debug	This is the 4.4.134 stable release	2018-05-30 13:25:24 +02:00
events	Merge android-4.4.135 (c9d74f2) into msm-4.4	2018-06-27 14:42:55 +05:30
gcov	gcov: disable for COMPILE_TEST	2018-01-23 19:50:10 +01:00
irq	Merge android-4.4.127 (d6bbe8b) into msm-4.4	2018-04-20 12:27:57 +05:30
livepatch
locking	Merge android-4.4.135 (c9d74f2) into msm-4.4	2018-06-27 14:42:55 +05:30
power	Merge "power: wakeup_reason: send uevent to user space"	2018-08-01 20:19:45 -07:00
printk	Merge android-4.4.127 (d6bbe8b) into msm-4.4	2018-04-20 12:27:57 +05:30
rcu	Merge android-4.4.107 (79f138a) into msm-4.4	2018-01-18 12:49:58 +05:30
sched	sched: walt: fix out-of-bounds access	2018-08-08 09:09:01 +05:30
time	Merge android-4.4.139 (7ba5557) into msm-4.4	2018-07-03 12:24:56 -07:00
trace	Merge android-4.4.140 (789274d) into msm-4.4	2018-07-18 15:09:28 +05:30
.gitignore
acct.c	kernel/acct.c: fix the acct->needcheck check in check_free_space()	2018-01-10 09:27:08 +01:00
async.c	kernel/async.c: revert "async: simplify lowest_in_progress()"	2018-02-16 20:09:45 +01:00
audit.c	This is the 4.4.134 stable release	2018-05-30 13:25:24 +02:00
audit.h
audit_fsnotify.c
audit_tree.c
audit_watch.c	audit: Fix use after free in audit_remove_watch_rule()	2017-08-24 17:02:35 -07:00
auditfilter.c
auditsc.c	Merge "Merge android-4.4.133 (3f51ea2) into msm-4.4"	2018-06-02 01:13:34 -07:00
backtracetest.c
bounds.c
capability.c	exec: Ensure mm->user_ns contains the execed files	2017-01-06 11:16:14 +01:00
cgroup.c	cgroup: Fix deadlock in cpu hotplug path	2018-08-13 23:21:04 -07:00
cgroup_freezer.c
cgroup_pids.c
compat.c
configs.c
context_tracking.c
cpu.c	cgroup/cpuset: remove circular dependency deadlock	2017-09-13 00:24:53 -07:00
cpu_pm.c
cpuset.c	Merge android-4.4@73a2b70 (v4.4.92) into msm-4.4	2017-10-20 02:11:57 -07:00
crash_dump.c
cred.c	cred: Reject inodes with invalid ids in set_create_file_as()	2016-09-15 08:27:49 +02:00
delayacct.c
dma.c
elfcore.c
exec_domain.c
exit.c	Merge android-4.4.133 (3f51ea2) into msm-4.4	2018-05-31 12:28:38 +05:30
extable.c	kernel/extable.c: mark core_kernel_text notrace	2017-07-21 07:44:56 +02:00
fork.c	Merge android-4.4.110 (5cc8c2e) into msm-4.4	2018-01-18 12:50:51 +05:30
freezer.c
futex.c	Merge android-4.4.133 (3f51ea2) into msm-4.4	2018-05-31 12:28:38 +05:30
futex_compat.c	BACKPORT: ptrace: use fsuid, fsgid, effective creds for fs access checks	2016-07-07 16:30:43 -07:00
groups.c	kernel: make groups_sort calling a responsibility group_info allocators	2018-01-10 09:27:10 +01:00
hung_task.c
irq_work.c
jump_label.c	jump_label: Invoke jump_label_test() via early_initcall()	2017-12-16 10:33:55 +01:00
kallsyms.c
kcmp.c	BACKPORT: ptrace: use fsuid, fsgid, effective creds for fs access checks	2016-07-07 16:30:43 -07:00
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kcov.c	UPSTREAM: kcov: fix comparison callback signature	2017-12-18 09:41:57 -08:00
kexec.c
kexec_core.c
kexec_file.c	kexec: fix double-free when failing to relocate the purgatory	2016-09-24 10:07:36 +02:00
kexec_internal.h
kmod.c
kprobes.c	kprobes/x86: Fix to set RWX bits correctly before releasing trampoline	2018-04-08 11:51:56 +02:00
ksysfs.c
kthread.c	UPSTREAM: kthread: Pin the stack via try_get_task_stack()/put_task_stack() in to_live_kthread() function	2017-08-09 15:23:22 +01:00
latencytop.c
Makefile	BACKPORT: kernel: add kcov code coverage	2017-12-18 09:41:57 -08:00
membarrier.c	Fix: Disable sys_membarrier when nohz_full is enabled	2017-03-12 06:37:26 +01:00
memremap.c	mm: fix devm_memremap_pages crash, use mem_hotplug_{begin, done}	2017-01-19 20:17:18 +01:00
module-internal.h
module.c	Merge android-4.4.118 (5f7f76a) into msm-4.4	2018-03-01 17:20:34 +05:30
module_signing.c
notifier.c
nsproxy.c
padata.c	padata: free correct variable	2017-05-20 14:27:02 +02:00
panic.c	soc: qcom: dump current task stack and task_struct for minidump	2017-09-01 02:51:08 -07:00
params.c
pid.c	pidns: disable pid allocation if pid_ns_prepare_proc() is failed in alloc_pid()	2018-04-13 19:50:03 +02:00
pid_namespace.c	pid_ns: Sleep in TASK_INTERRUPTIBLE in zap_pid_ns_processes	2017-05-25 14:30:11 +02:00
profile.c	profile: hide unused functions when !CONFIG_PROC_FS	2018-02-25 11:03:44 +01:00
ptrace.c	ptrace: Properly initialize ptracer_cred on fork	2017-06-14 13:16:20 +02:00
range.c
reboot.c
relay.c	kernel/relay.c: limit kmalloc size to KMALLOC_MAX_SIZE	2018-05-30 07:49:00 +02:00
resource.c	Merge android-4.4.129 (b1c4836) into msm-4.4	2018-04-24 19:07:57 +05:30
seccomp.c	seccomp: fix the usage of get/put_seccomp_filter() in seccomp_get_filter()	2017-10-05 09:41:46 +02:00
signal.c	kernel/signal.c: avoid undefined behaviour in kill_something_info	2018-05-30 07:48:52 +02:00
smp.c	smp: Do not wake up all idle CPUs	2016-09-24 10:59:58 -07:00
smpboot.c	sched: Add per CPU load tracking for each task	2016-10-17 12:43:53 -07:00
smpboot.h
softirq.c	softirq: Don't defer all softirq during RT task	2018-03-22 23:20:10 -07:00
stacktrace.c
stop_machine.c
sys.c	This is the 4.4.134 stable release	2018-05-30 13:25:24 +02:00
sys_ni.c
sysctl.c	trace/irq: Add trace point to track IRQs disable callers	2018-04-24 11:33:20 +05:30
sysctl_binary.c	netfilter: nf_defrag_ipv4: Add sysctl to disable per interface	2018-01-10 13:57:22 -07:00
task_work.c
taskstats.c	taskstats: fix the length of cgroupstats_cmd_get_policy	2018-05-03 14:03:24 -07:00
test_kprobes.c
torture.c
tracepoint.c	tracepoint: Do not warn on ENOMEM	2018-05-16 10:06:47 +02:00
tsacct.c
uid16.c	kernel: make groups_sort calling a responsibility group_info allocators	2018-01-10 09:27:10 +01:00
up.c
user-return-notifier.c
user.c	ANDROID: proc: Add /proc/uid directory	2018-03-06 20:39:55 +00:00
user_namespace.c
utsname.c
utsname_sysctl.c
watchdog.c	Merge branch 'android-4.4@8e53f7c' into branch 'msm-4.4'	2017-04-10 16:46:42 -07:00
workqueue.c	Merge android-4.4.135 (c9d74f2) into msm-4.4	2018-06-27 14:42:55 +05:30
workqueue_internal.h	workqueue: Fix NULL pointer dereference	2017-11-15 17:13:11 +01:00