Repository files (latest commit first)

Filename	Latest commit message	Latest commit date
Tejun Heo 82607adcf9 workqueue: implement lockup detector ... Workqueue stalls can happen from a variety of usage bugs such as missing WQ_MEM_RECLAIM flag or concurrency managed work item indefinitely staying RUNNING. These stalls can be extremely difficult to hunt down because the usual warning mechanisms can't detect workqueue stalls and the internal state is pretty opaque. To alleviate the situation, this patch implements workqueue lockup detector. It periodically monitors all worker_pools periodically and, if any pool failed to make forward progress longer than the threshold duration, triggers warning and dumps workqueue state as follows. BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 31s! Showing busy workqueues and worker pools: workqueue events: flags=0x0 pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=17/256 pending: monkey_wrench_fn, e1000_watchdog, cache_reap, vmstat_shepherd, release_one_tty, release_one_tty, release_one_tty, release_one_tty, release_one_tty, release_one_tty, release_one_tty, release_one_tty, release_one_tty, release_one_tty, release_one_tty, release_one_tty, cgroup_release_agent workqueue events_power_efficient: flags=0x80 pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=2/256 pending: check_lifetime, neigh_periodic_work workqueue cgroup_pidlist_destroy: flags=0x0 pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/1 pending: cgroup_pidlist_destroy_work_fn ... The detection mechanism is controller through kernel parameter workqueue.watchdog_thresh and can be updated at runtime through the sysfs module parameter file. v2: Decoupled from softlockup control knobs. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Don Zickus <dzickus@redhat.com> Cc: Ulrich Obergfell <uobergfe@redhat.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Chris Mason <clm@fb.com> Cc: Andrew Morton <akpm@linux-foundation.org>		2015-12-08 11:29:47 -05:00
..
842	crypto: 842 - Add CRC and validation support	2015-10-14 22:23:17 +08:00
fonts	fonts: Add 6x10 font	2014-10-09 11:35:48 +03:00
lz4	lz4: fix system halt at boot kernel on x86_64	2015-05-24 11:56:29 -07:00
lzo	lzo: check for length overrun in variable length encoding.	2014-09-28 11:08:01 +02:00
mpi	asm-generic cleanups	2015-11-06 14:22:15 -08:00
raid6	md/raid6: delta syndrome for ARM NEON	2015-08-31 19:29:05 +02:00
reed_solomon
xz
zlib_deflate	zlib_deflate/deftree: remove bi_reverse()	2015-09-10 13:29:01 -07:00
zlib_inflate
.gitignore
argv_split.c
asn1_decoder.c	ASN.1: Handle 'ANY OPTIONAL' in grammar	2015-08-05 13:38:07 +01:00
assoc_array.c	assoc_array: Include rcupdate.h for call_rcu() definition	2015-01-07 16:08:41 +00:00
atomic64.c	atomic: Provide atomic_{or,xor,and}	2015-07-27 14:06:24 +02:00
atomic64_test.c	atomic: Add simple atomic_t tests	2015-07-27 14:06:24 +02:00
audit.c	syscalls: implement execveat() system call	2014-12-13 12:42:51 -08:00
bcd.c
bch.c
bitmap.c	lib/bitmap.c: bitmap_parselist can accept string with whitespaces on head or tail	2015-09-10 13:29:01 -07:00
bitrev.c	ARM: 8187/1: add CONFIG_HAVE_ARCH_BITREVERSE to support rbit instruction	2014-12-22 16:43:06 +00:00
bsearch.c
btree.c
bug.c	module: Sanitize RCU usage and locking	2015-05-28 11:31:52 +09:30
build_OID_registry
bust_spinlocks.c
check_signature.c
checksum.c	lib/checksum.c: fix build for generic csum_tcpudp_nofold	2015-01-29 11:57:38 -08:00
clz_ctz.c
clz_tab.c
cmdline.c	lib: Add a generic cmdline parse function parse_option_str	2014-10-03 18:40:58 +01:00
compat_audit.c
cordic.c
cpu-notifier-error-inject.c
cpu_rmap.c	sched/topology: Rename topology_thread_cpumask() to topology_sibling_cpumask()	2015-05-27 15:22:15 +02:00
cpumask.c	revert "cpumask: don't perform while loop in cpumask_next_and()"	2015-06-18 17:00:23 -10:00
crc-ccitt.c
crc-itu-t.c	lib: crc-itu-t.[ch] fix 0x0x prefix in integer constants	2015-05-26 15:26:43 +02:00
crc-t10dif.c	lib: introduce crc_t10dif_update()	2015-05-30 22:42:24 -07:00
crc7.c
crc8.c
crc16.c
crc32.c
crc32defs.h
ctype.c
debug_info.c	kbuild: include core debug info when DEBUG_INFO_REDUCED	2015-06-11 15:08:32 +02:00
debug_locks.c
debugobjects.c
dec_and_lock.c
decompress.c	lib/decompress: set the compressor name to NULL on error	2015-07-17 16:39:54 -07:00
decompress_bunzip2.c	lib/decompressors: use real out buf size for gunzip with kernel	2015-09-10 13:29:01 -07:00
decompress_inflate.c	lib/decompressors: use real out buf size for gunzip with kernel	2015-09-10 13:29:01 -07:00
decompress_unlz4.c	lib/decompressors: use real out buf size for gunzip with kernel	2015-09-10 13:29:01 -07:00
decompress_unlzma.c	lib/decompress_unlzma: Do a NULL check for pointer	2015-09-10 13:29:01 -07:00
decompress_unlzo.c	lib/decompressors: use real out buf size for gunzip with kernel	2015-09-10 13:29:01 -07:00
decompress_unxz.c	lib/decompressors: use real out buf size for gunzip with kernel	2015-09-10 13:29:01 -07:00
devres.c	devres: fix a for loop bounds check	2015-10-05 04:49:54 +01:00
digsig.c	KEYS: Merge the type-specific data with the payload data	2015-10-21 15:18:36 +01:00
div64.c	remove abs64()	2015-11-09 15:11:24 -08:00
dma-debug.c	dma-debug: check nents in dma_sync_sg*	2015-11-06 17:50:42 -08:00
dump_stack.c
dynamic_debug.c	lib/dynamic_debug.c: use kstrdup_const	2015-11-06 17:50:42 -08:00
dynamic_queue_limits.c	lib/dynamic_queue_limits.c: simplify includes	2015-02-12 18:54:15 -08:00
earlycpio.c
extable.c
fault-inject.c	fault-inject: fix inverted interval/probability values in printk	2015-10-23 17:55:10 +09:00
fdt.c
fdt_empty_tree.c
fdt_ro.c
fdt_rw.c
fdt_strerror.c
fdt_sw.c
fdt_wip.c
find_bit.c	lib: rename lib/find_next_bit.c to lib/find_bit.c	2015-04-17 09:03:54 -04:00
flex_array.c
flex_proportions.c	proportions: add @gfp to init functions	2014-09-08 09:51:30 +09:00
gcd.c
gen_crc32table.c	lib: crc32: constify crc32 lookup table	2015-02-13 21:21:35 -08:00
genalloc.c	genalloc: add support of multiple gen_pools per device	2015-09-04 16:54:41 -07:00
glob.c
halfmd4.c	lib/halfmd4.c: use rol32 inline function in the ROUND macro	2015-11-06 17:50:42 -08:00
hexdump.c	lib/hexdump.c: truncate output in case of overflow	2015-11-06 17:50:42 -08:00
hweight.c	Make ARCH_HAS_FAST_MULTIPLIER a real config variable	2014-09-13 11:14:53 -07:00
idr.c	mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd	2015-11-06 17:50:42 -08:00
inflate.c
int_sqrt.c
interval_tree.c	lib/interval_tree.c: simplify includes	2015-02-12 18:54:15 -08:00
interval_tree_test.c
iomap.c
iomap_copy.c
iommu-common.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc	2015-11-05 16:34:48 -08:00
iommu-helper.c
ioremap.c	x86, mm: support huge KVA mappings on x86	2015-04-14 16:49:04 -07:00
iov_iter.c	Merge branch 'iov_iter' into for-next	2015-04-11 22:26:51 -04:00
irq_regs.c
is_single_threaded.c	lib/is_single_threaded.c: change current_is_single_threaded() to use for_each_thread()	2015-11-06 17:50:42 -08:00
jedec_ddr_data.c
kasprintf.c	lib/kasprintf.c: introduce kvasprintf_const	2015-11-06 17:50:42 -08:00
Kconfig	lib/Kconfig: ZLIB_DEFLATE must select BITREVERSE	2015-10-16 11:42:28 -07:00
Kconfig.debug	workqueue: implement lockup detector	2015-12-08 11:29:47 -05:00
Kconfig.kasan	mm, slub, kasan: enable user tracking by default with KASAN=y	2015-11-05 19:34:48 -08:00
Kconfig.kgdb	kdb: Allow access to sensitive commands to be restricted by default	2014-11-11 09:31:52 -06:00
Kconfig.kmemcheck
kfifo.c
klist.c	klist: implement klist_prev()	2015-07-28 08:50:42 +01:00
kobject.c	lib/kobject.c: use kvasprintf_const for formatting ->name	2015-11-06 17:50:42 -08:00
kobject_uevent.c	lib/kobject_uevent.c: remove redundant include	2015-02-12 18:54:15 -08:00
kstrtox.c	kstrto*: accept "-0" for signed conversion	2015-09-10 13:29:01 -07:00
kstrtox.h
lcm.c	block: fix blk_stack_limits() regression due to lcm() change	2015-03-31 09:45:50 -06:00
libcrc32c.c	crypto: LLVMLinux: Remove VLAIS usage from libcrc32c.c	2014-10-14 10:51:23 +02:00
list_debug.c
list_sort.c	lib/list_sort: use late_initcall to hook in self tests	2015-06-16 14:12:35 -04:00
llist.c	lib/llist.c: fix data race in llist_del_first	2015-11-06 17:50:42 -08:00
locking-selftest-hardirq.h
locking-selftest-mutex.h
locking-selftest-rlock-hardirq.h
locking-selftest-rlock-softirq.h
locking-selftest-rlock.h
locking-selftest-rsem.h
locking-selftest-softirq.h
locking-selftest-spin-hardirq.h
locking-selftest-spin-softirq.h
locking-selftest-spin.h
locking-selftest-wlock-hardirq.h
locking-selftest-wlock-softirq.h
locking-selftest-wlock.h
locking-selftest-wsem.h
locking-selftest.c	locking/lockdep: Revert qrwlock recusive stuff	2014-10-03 06:09:30 +02:00
lockref.c	locking/lockref: Remove homebrew cmpxchg64_relaxed() macro definition	2015-08-12 11:59:04 +02:00
lru_cache.c	lru_cache: remove use of seq_printf return value	2015-04-15 16:35:25 -07:00
Makefile	test_printf: test printf family at runtime	2015-11-06 17:50:42 -08:00
md5.c	lib/md5.c: simplify include	2015-02-12 18:54:15 -08:00
memory-notifier-error-inject.c
memweight.c
net_utils.c
nlattr.c	netlink: pad nla_memcpy dest buffer with zeroes	2015-03-31 14:07:24 -04:00
nmi_backtrace.c	ARM: 8439/1: Fix backtrace generation when IPI is masked	2015-10-03 16:40:51 +01:00
notifier-error-inject.c
notifier-error-inject.h
of-reconfig-notifier-error-inject.c
oid_registry.c
once.c	once: make helper generic for calling functions once	2015-10-08 05:26:36 -07:00
parser.c
pci_iomap.c	libnvdimm for 4.3:	2015-09-08 14:35:59 -07:00
percpu-refcount.c	percpu_ref: make INIT_ATOMIC and switch_to_atomic() sticky	2014-09-24 13:31:50 -04:00
percpu_counter.c	percpu_counter: batch size aware __percpu_counter_compare()	2015-05-29 07:39:34 +10:00
percpu_ida.c	mm, page_alloc: rename __GFP_WAIT to __GFP_RECLAIM	2015-11-06 17:50:42 -08:00
percpu_test.c
plist.c	lib/plist.c: remove redundant include	2015-02-12 18:54:16 -08:00
pm-notifier-error-inject.c
proportions.c	proportions: add @gfp to init functions	2014-09-08 09:51:30 +09:00
radix-tree.c	mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd	2015-11-06 17:50:42 -08:00
random32.c	random32: add prandom_init_once helper for own rngs	2015-10-08 05:26:38 -07:00
ratelimit.c
rational.c
rbtree.c	rbtree: Make lockless searches non-fatal	2015-05-28 11:32:04 +09:30
rbtree_test.c
reciprocal_div.c
rhashtable.c	lib: fix data race in rhashtable_rehash_one	2015-09-22 17:36:07 -07:00
scatterlist.c	scatterlist: allow limited chaining without ARCH_HAS_SG_CHAIN	2015-08-17 08:12:51 -06:00
seq_buf.c	seq_buf: Fix seq_buf_bprintf() truncation	2015-03-04 23:40:19 -05:00
sg_split.c	lib: scatterlist: add sg splitting function	2015-08-24 14:28:01 -06:00
sha1.c	lib: EXPORT_SYMBOL sha_init	2015-03-23 22:12:08 -04:00
show_mem.c	lib/show_mem.c: correct reserved memory calculation	2015-09-08 15:35:28 -07:00
smp_processor_id.c
sort.c	lib/sort: Add 64 bit swap function	2015-06-25 17:00:40 -07:00
stmp_device.c	lib/stmp_device.c: replace module.h include	2015-02-12 18:54:16 -08:00
string.c	lib/string.c: add ULL suffix to the constant definition	2015-11-10 16:32:11 -08:00
string_helpers.c	lib/string_helpers.c: fix infinite loop in string_get_size()	2015-09-17 21:16:07 -07:00
strncpy_from_user.c	lib: move strncpy_from_unsafe() into mm/maccess.c	2015-08-31 12:36:10 -07:00
strnlen_user.c	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2015-06-22 15:52:04 -07:00
swiotlb.c	Merge branch 'for-4.2/sg' of git://git.kernel.dk/linux-block	2015-06-25 15:22:36 -07:00
syscall.c
test-hexdump.c	hexdump: Make test data really const	2015-06-25 17:00:40 -07:00
test-kstrtox.c	kstrto*: accept "-0" for signed conversion	2015-09-10 13:29:01 -07:00
test-string_helpers.c	lib/test-string_helpers.c: add string_get_size() tests	2015-11-06 17:50:42 -08:00
test_bpf.c	bpf: add mod default A and X test cases	2015-11-05 00:05:50 -05:00
test_firmware.c
test_kasan.c	lib: test_kasan: add some testcases	2015-11-05 19:34:48 -08:00
test_module.c
test_printf.c	test_printf: test printf family at runtime	2015-11-06 17:50:42 -08:00
test_rhashtable.c	rhashtable-test: extend to test concurrency	2015-08-17 14:33:47 -07:00
test_static_key_base.c	locking/static_keys: Provide a selftest	2015-08-03 11:51:12 +02:00
test_static_keys.c	locking/static_keys: Make verify_keys() static	2015-08-05 09:53:40 +02:00
test_user_copy.c
textsearch.c	lib/textsearch.c: remove textsearch_put reference from comments	2014-10-14 02:18:14 +02:00
timerqueue.c	timerqueue: Let timerqueue_add/del return information	2015-04-22 17:06:49 +02:00
ts_bm.c
ts_fsm.c
ts_kmp.c
ucs2_string.c
usercopy.c
uuid.c
vsprintf.c	lib/vsprintf.c: update documentation	2015-11-06 17:50:42 -08:00