Petr Mladek cd2440d66f workqueue: Print backtraces from CPUs with hung CPU bound workqueues ... The workqueue watchdog reports a lockup when there was not any progress in the worker pool for a long time. The progress means that a pending work item starts being proceed. Worker pools for unbound workqueues always wake up an idle worker and try to process the work immediately. The last idle worker has to create new worker first. The stall might happen only when a new worker could not be created in which case an error should get printed. Another problem might be too high load. In this case, workers are victims of a global system problem. Worker pools for CPU bound workqueues are designed for lightweight work items that do not need much CPU time. They are proceed one by one on a single worker. New worker is used only when a work is sleeping. It creates one additional scenario. The stall might happen when the CPU-bound workqueue is used for CPU-intensive work. More precisely, the stall is detected when a CPU-bound worker is in the TASK_RUNNING state for too long. In this case, it might be useful to see the backtrace from the problematic worker. The information how long a worker is in the running state is not available. But the CPU-bound worker pools do not have many workers in the running state by definition. And only few pools are typically blocked. It should be acceptable to print backtraces from all workers in TASK_RUNNING state in the stalled worker pools. The number of false positives should be very low. Signed-off-by: Petr Mladek <pmladek@suse.com> Signed-off-by: Tejun Heo <tj@kernel.org>		2023-03-17 12:03:47 -10:00
..
bpf	bpf-for-netdev	2023-03-06 20:28:00 -08:00
cgroup	Networking changes for 6.3.	2023-02-21 18:24:12 -08:00
configs	mm, slob: rename CONFIG_SLOB to CONFIG_SLOB_DEPRECATED	2022-12-01 00:09:20 +01:00
debug	kdb: use srcu console list iterator	2022-12-02 11:25:00 +01:00
dma	swiotlb: mark swiotlb_memblock_alloc() as __init	2023-02-22 06:44:48 -08:00
entry	entry: kmsan: introduce kmsan_unpoison_entry_regs()	2022-10-03 14:03:25 -07:00
events	Char/Misc and other driver subsystem changes for 6.3-rc1	2023-02-24 12:47:33 -08:00
futex	- Prevent the leaking of a debug timer in futex_waitv()	2023-01-01 11:15:05 -08:00
gcov	gcov: add support for checksum field	2022-12-21 14:31:52 -08:00
irq	A set of updates for the interrupt susbsystem:	2023-03-05 11:19:16 -08:00
kcsan	kcsan: test: don't put the expect array on the stack	2023-01-02 08:59:33 -08:00
livepatch	Livepatching changes for 6.3	2023-02-23 14:00:10 -08:00
locking	RCU pull request for v6.3	2023-02-21 10:45:51 -08:00
module	modules-6.3-rc1	2023-02-23 14:05:08 -08:00
power	Merge branches 'powercap', 'pm-domains', 'pm-em' and 'pm-opp'	2023-02-15 20:06:26 +01:00
printk	printk changes for 6.3	2023-02-23 13:49:45 -08:00
rcu	Merge branch 'stall.2023.01.09a' into HEAD	2023-02-02 16:40:07 -08:00
sched	sched_getaffinity: don't assume 'cpumask_size()' is fully initialized	2023-03-14 19:32:38 -07:00
time	Updates for timekeeping, timers and clockevent/source drivers:	2023-02-21 09:45:13 -08:00
trace	Tracing fixes for v6.3	2023-03-14 17:07:54 -07:00
.gitignore
acct.c	acct: fix potential integer overflow in encode_comp_t()	2022-11-30 16:13:18 -08:00
async.c
audit.c
audit.h
audit_fsnotify.c
audit_tree.c
audit_watch.c
auditfilter.c
auditsc.c	capability: just use a 'u64' instead of a 'u32[2]' array	2023-03-01 10:01:22 -08:00
backtracetest.c
bounds.c
capability.c	capability: just use a 'u64' instead of a 'u32[2]' array	2023-03-01 10:01:22 -08:00
cfi.c
compat.c	sched_getaffinity: don't assume 'cpumask_size()' is fully initialized	2023-03-14 19:32:38 -07:00
configs.c
context_tracking.c	context_tracking: Fix noinstr vs KASAN	2023-01-13 11:48:18 +01:00
cpu.c	cpu/hotplug: Do not bail-out in DYING/STARTING sections	2022-12-02 12:43:02 +01:00
cpu_pm.c	cpuidle, cpu_pm: Remove RCU fiddling from cpu_pm_{enter,exit}()	2023-01-13 11:48:15 +01:00
crash_core.c	mm: remove 'First tail page' members from struct page	2023-02-02 22:32:59 -08:00
crash_dump.c
cred.c	cred: Do not default to init_cred in prepare_kernel_cred()	2022-11-01 10:04:52 -07:00
delayacct.c
dma.c
exec_domain.c
exit.c	arm64 updates for 6.3:	2023-02-21 15:27:48 -08:00
extable.c
fail_function.c	kernel/fail_function: fix memory leak with using debugfs_lookup()	2023-02-08 13:36:22 +01:00
fork.c	fork: allow CLONE_NEWTIME in clone3 flags	2023-03-08 12:31:34 +01:00
freezer.c
gen_kheaders.sh	kheaders: use standard naming for the temporary directory	2023-01-22 23:43:34 +09:00
groups.c
hung_task.c	hung_task: print message when hung_task_warnings gets down to zero.	2023-02-09 17:03:20 -08:00
iomem.c
irq_work.c
jump_label.c	jump_label: Prevent key->enabled int overflow	2022-12-01 15:53:05 -08:00
kallsyms.c	kallsyms: Add self-test facility	2022-11-15 00:42:02 -08:00
kallsyms_internal.h	kallsyms: Reduce the memory occupied by kallsyms_seqs_of_names[]	2022-11-12 18:47:36 -08:00
kallsyms_selftest.c	kallsyms: Fix scheduling with interrupts disabled in self-test	2023-01-13 15:09:08 -08:00
kallsyms_selftest.h	kallsyms: Add self-test facility	2022-11-15 00:42:02 -08:00
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kcov.c	mm: replace vma->vm_flags direct modifications with modifier calls	2023-02-09 16:51:39 -08:00
kexec.c	kexec: introduce sysctl parameters kexec_load_limit_*	2023-02-02 22:50:05 -08:00
kexec_core.c	There is no particular theme here - mainly quick hits all over the tree.	2023-02-23 17:55:40 -08:00
kexec_elf.c
kexec_file.c	kexec: introduce sysctl parameters kexec_load_limit_*	2023-02-02 22:50:05 -08:00
kexec_internal.h
kheaders.c
kmod.c
kprobes.c	x86/kprobes: Fix arch_check_optimized_kprobe check within optimized_kprobe range	2023-02-21 08:49:16 +09:00
ksysfs.c	kernels/ksysfs.c: export kernel address bits	2023-01-20 14:30:45 +01:00
kthread.c	kthread_worker: check all delayed works when destroy kthread worker	2023-02-02 22:50:02 -08:00
latencytop.c
Makefile	kernel hardening fixes for v6.2-rc1	2022-12-23 12:00:24 -08:00
module_signature.c
notifier.c	kernel/notifier: Remove CONFIG_SRCU	2023-02-02 16:26:06 -08:00
nsproxy.c	fs/exec: switch timens when a task gets a new mm	2022-10-25 15:15:52 -07:00
padata.c	Kbuild updates for v6.2	2022-12-19 12:33:32 -06:00
panic.c	panic: fix the panic_print NMI backtrace setting	2023-03-02 21:54:23 -08:00
params.c	kernel/params.c: Use kstrtobool() instead of strtobool()	2023-01-25 14:07:21 -08:00
pid.c
pid_namespace.c	- Daniel Verkamp has contributed a memfd series ("mm/memfd: add	2023-02-23 17:09:35 -08:00
pid_sysctl.h	mm/memfd: add MFD_NOEXEC_SEAL and MFD_EXEC	2023-01-18 17:12:37 -08:00
profile.c
ptrace.c	rseq: Introduce extensible rseq ABI	2022-12-27 12:52:10 +01:00
range.c
reboot.c	kernel/reboot: Add SYS_OFF_MODE_RESTART_PREPARE mode	2022-10-04 15:59:36 +02:00
regset.c
relay.c	mm: replace vma->vm_flags direct modifications with modifier calls	2023-02-09 16:51:39 -08:00
resource.c	dax/kmem: Fix leak of memory-hotplug resources	2023-02-17 14:58:01 -08:00
resource_kunit.c
rseq.c	rseq: Extend struct rseq with per-memory-map concurrency ID	2022-12-27 12:52:12 +01:00
scftorture.c
scs.c	scs: add support for dynamic shadow call stacks	2022-11-09 18:06:35 +00:00
seccomp.c	seccomp: fix kernel-doc function name warning	2023-01-13 17:01:06 -08:00
signal.c	sched: Introduce per-memory-map concurrency ID	2022-12-27 12:52:11 +01:00
smp.c	bitmap patches for v6.1-rc1	2022-10-10 12:49:34 -07:00
smpboot.c
smpboot.h
softirq.c
stackleak.c
stacktrace.c
static_call.c
static_call_inline.c	static_call: Add call depth tracking support	2022-10-17 16:41:16 +02:00
stop_machine.c
sys.c	- Daniel Verkamp has contributed a memfd series ("mm/memfd: add	2023-02-23 17:09:35 -08:00
sys_ni.c
sysctl-test.c
sysctl.c	sysctl: fix proc_dobool() usability	2023-02-21 13:34:07 -08:00
task_work.c
taskstats.c
torture.c	torture: Fix hang during kthread shutdown phase	2023-01-05 12:10:35 -08:00
tracepoint.c	tracepoint: Allow livepatch module add trace event	2023-02-18 14:34:36 -05:00
tsacct.c
ucount.c
uid16.c
uid16.h
umh.c	umh: simplify the capability pointer logic	2023-03-03 16:18:19 -08:00
up.c
user-return-notifier.c
user.c	kernel/user: Allow user_struct::locked_vm to be usable for iommufd	2022-11-30 20:16:49 -04:00
user_namespace.c	userns: fix a struct's kernel-doc notation	2023-02-02 22:50:04 -08:00
usermode_driver.c
utsname.c
utsname_sysctl.c	kernel/utsname_sysctl.c: Fix hostname polling	2022-10-23 12:01:01 -07:00
watch_queue.c	watch_queue: fix IOC_WATCH_QUEUE_SET_SIZE alloc error paths	2023-03-08 11:44:45 +01:00
watchdog.c
watchdog_hld.c
workqueue.c	workqueue: Print backtraces from CPUs with hung CPU bound workqueues	2023-03-17 12:03:47 -10:00
workqueue_internal.h