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Zqiang a1ffa0673d kthread_worker: prevent queuing delayed work from timer_fn when it is being canceled 
commit 6993d0fdbe upstream.

There is a small race window when a delayed work is being canceled and
the work still might be queued from the timer_fn:

	CPU0						CPU1
kthread_cancel_delayed_work_sync()
   __kthread_cancel_work_sync()
     __kthread_cancel_work()
        work->canceling++;
					      kthread_delayed_work_timer_fn()
						   kthread_insert_work();

BUG: kthread_insert_work() should not get called when work->canceling is
set.

Signed-off-by: Zqiang <qiang.zhang@windriver.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Acked-by: Tejun Heo <tj@kernel.org>
Cc: <stable@vger.kernel.org>
Link: https://lkml.kernel.org/r/20201014083030.16895-1-qiang.zhang@windriver.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-11-10 10:24:02 +01:00
..
bpf
bpf: Remove recursion prevention from rcu free callback
2020-10-01 20:40:08 +02:00
configs
…
debug
kgdb: Make "kgdbcon" work properly with "kgdb_earlycon"
2020-11-10 10:23:53 +01:00
events
perf: Fix task_function_call() error handling
2020-10-14 09:48:17 +02:00
gcov
gcov: add support for GCC 10.1
2020-09-23 08:46:14 +02:00
irq
genirq/generic_pending: Do not lose pending affinity update
2020-06-03 08:16:47 +02:00
livepatch
…
locking
locking/lockdep: Fix overflow in presentation of average lock-time
2020-09-03 11:21:18 +02:00
power
PM: hibernate: remove the bogus call to get_gendisk() in software_resume()
2020-10-29 09:05:43 +01:00
printk
printk: handle blank console arguments passed in.
2020-10-01 20:40:14 +02:00
rcu
rcuperf: Fix cleanup path for invalid perf_type strings
2019-05-31 06:48:30 -07:00
sched
sched/fair: handle case of task_h_load() returning 0
2020-07-22 09:10:54 +02:00
time
timekeeping: Prevent 32bit truncation in scale64_check_overflow()
2020-10-01 20:40:09 +02:00
trace
ring-buffer: Return 0 on success from ring_buffer_resize()
2020-11-10 10:23:59 +01:00
.gitignore
…
acct.c
…
async.c
…
audit_fsnotify.c
…
audit_tree.c
…
audit_watch.c
audit: CONFIG_CHANGE don't log internal bookkeeping as an event
2020-10-01 20:40:07 +02:00
audit.c
audit: check the length of userspace generated audit records
2020-05-02 17:23:12 +02:00
audit.h
…
auditfilter.c
audit: fix error handling in audit_data_to_entry()
2020-03-11 07:53:05 +01:00
auditsc.c
audit: print empty EXECVE args
2019-11-28 18:28:55 +01:00
backtracetest.c
…
bounds.c
kbuild: fix kernel/bounds.c 'W=1' warning
2018-11-13 11:16:57 -08:00
capability.c
…
cgroup_freezer.c
…
cgroup_pids.c
cgroup: pids: use atomic64_t for pids->limit
2019-12-21 10:42:02 +01:00
cgroup.c
cgroup: add missing skcd->no_refcnt check in cgroup_sk_clone()
2020-08-21 11:01:56 +02:00
compat.c
…
configs.c
…
context_tracking.c
…
cpu_pm.c
kernel/cpu_pm: Fix uninitted local in cpu_pm
2020-06-20 10:24:21 +02:00
cpu.c
x86/speculation: Remove redundant arch_smt_update() invocation
2020-04-24 07:58:57 +02:00
cpuset.c
…
crash_dump.c
…
cred.c
memcg: account security cred as well to kmemcg
2020-01-12 11:24:13 +01:00
delayacct.c
…
dma.c
…
elfcore.c
kernel/elfcore.c: include proper prototypes
2019-10-17 13:42:13 -07:00
exec_domain.c
…
exit.c
exit: Move preemption fixup up, move blocking operations down
2020-06-20 10:24:16 +02:00
extable.c
…
fork.c
kernel/sysctl.c: do not override max_threads provided by userspace
2019-10-17 13:42:44 -07:00
freezer.c
…
futex_compat.c
…
futex.c
futex: Unbreak futex hashing
2020-04-02 17:20:28 +02:00
groups.c
…
hung_task.c
kernel: hung_task.c: disable on suspend
2019-04-20 09:07:52 +02:00
irq_work.c
…
jump_label.c
…
kallsyms.c
…
kcmp.c
…
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.locks
…
Kconfig.preempt
…
kcov.c
…
kexec_core.c
…
kexec_file.c
…
kexec_internal.h
…
kexec.c
…
kmod.c
usermodehelper: reset umask to default before executing user process
2020-10-14 09:48:14 +02:00
kprobes.c
kprobes: Fix to check probe enabled before disarm_kprobe_ftrace()
2020-10-01 20:40:18 +02:00
ksysfs.c
…
kthread.c
kthread_worker: prevent queuing delayed work from timer_fn when it is being canceled
2020-11-10 10:24:02 +01:00
latencytop.c
…
Makefile
x86/uaccess, kcov: Disable stack protector
2019-06-22 08:17:19 +02:00
membarrier.c
…
memremap.c
mm, devm_memremap_pages: kill mapping "System RAM" support
2019-01-13 10:03:51 +01:00
module_signing.c
…
module-internal.h
…
module.c
kernel/module.c: wakeup processes in module_wq on module unload
2019-12-21 10:42:21 +01:00
notifier.c
x86/mm: split vmalloc_sync_all()
2020-04-02 17:20:26 +02:00
nsproxy.c
…
padata.c
padata: purge get_cpu and reorder_via_wq from padata_do_serial
2020-05-27 16:41:53 +02:00
panic.c
panic: ensure preemption is disabled during panic()
2019-10-17 13:42:25 -07:00
params.c
…
pid_namespace.c
signal/pid_namespace: Fix reboot_pid_ns to use send_sig not force_sig
2019-08-04 09:33:16 +02:00
pid.c
…
profile.c
…
ptrace.c
ptrace: Fix ->ptracer_cred handling for PTRACE_TRACEME
2019-07-10 09:55:45 +02:00
range.c
…
reboot.c
…
relay.c
kernel/relay.c: fix memleak on destroy relay channel
2020-08-26 10:29:03 +02:00
resource.c
…
seccomp.c
…
signal.c
signal: Extend exec_id to 64bits
2020-04-24 07:58:54 +02:00
smp.c
cpu/hotplug: Fix SMT supported evaluation
2018-08-15 18:14:53 +02:00
smpboot.c
…
smpboot.h
…
softirq.c
Mark HI and TASKLET softirq synchronous
2018-08-15 18:14:42 +02:00
stacktrace.c
…
stop_machine.c
…
sys_ni.c
…
sys.c
kernel/sys.c: avoid copying possible padding bytes in copy_to_user
2020-10-01 20:40:04 +02:00
sysctl_binary.c
…
sysctl.c
sched/rt: Show the 'sched_rr_timeslice' SCHED_RR timeslice tuning knob in milliseconds
2020-07-09 09:35:55 +02:00
task_work.c
…
taskstats.c
taskstats: fix data-race
2020-01-12 11:24:12 +01:00
test_kprobes.c
…
torture.c
…
tracepoint.c
…
tsacct.c
…
ucount.c
…
uid16.c
…
up.c
…
user_namespace.c
userns: move user access out of the mutex
2018-09-09 20:01:24 +02:00
user-return-notifier.c
…
user.c
…
utsname_sysctl.c
sys: don't hold uts_sem while accessing userspace memory
2018-09-09 20:01:24 +02:00
utsname.c
…
watchdog_hld.c
…
watchdog.c
…
workqueue_internal.h
…
workqueue.c
workqueue: don't use wq_select_unbound_cpu() for bound works
2020-03-20 09:07:43 +01:00