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Kevin Hao cf63c2a490 dump_stack: avoid the livelock of the dump_lock 
commit 5cbf2fff3bba8d3c6a4d47c1754de1cf57e2b01f upstream.

In the current code, we use the atomic_cmpxchg() to serialize the output
of the dump_stack(), but this implementation suffers the thundering herd
problem.  We have observed such kind of livelock on a Marvell cn96xx
board(24 cpus) when heavily using the dump_stack() in a kprobe handler.
Actually we can let the competitors to wait for the releasing of the
lock before jumping to atomic_cmpxchg().  This will definitely mitigate
the thundering herd problem.  Thanks Linus for the suggestion.

[akpm@linux-foundation.org: fix comment]
Link: http://lkml.kernel.org/r/20191030031637.6025-1-haokexin@gmail.com
Fixes: b58d977432c8 ("dump_stack: serialize the output from dump_stack()")
Signed-off-by: Kevin Hao <haokexin@gmail.com>
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-04-07 11:48:34 +02:00
..
842 A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
fonts A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
lz4 A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
lzo A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
mpi lib/mpi: Fix karactx leak in mpi_powm 2020-04-06 19:21:06 +02:00
raid6 ARM: 8833/1: Ensure that NEON code always compiles with Clang 2020-04-06 14:51:24 +02:00
reed_solomon rslib: Fix handling of of caller provided syndrome 2020-04-06 19:55:29 +02:00
xz A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
zlib_deflate A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
zlib_inflate A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
zstd A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
argv_split.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
asn1_decoder.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
assoc_array.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
atomic64_test.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
atomic64.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
audit.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
bcd.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
bch.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
bitmap.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
bitrev.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
bsearch.c kprobes: Prohibit probing on bsearch() 2020-04-06 14:51:19 +02:00
btree.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
bug.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
build_OID_registry A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
bust_spinlocks.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
check_signature.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
checksum.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
clz_ctz.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
clz_tab.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
cmdline.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
compat_audit.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
cordic.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
cpu_rmap.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
cpu-notifier-error-inject.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
cpumask.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
crc-ccitt.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
crc-itu-t.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
crc-t10dif.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
crc7.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
crc8.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
crc16.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
crc32.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
crc32defs.h A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
ctype.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
debug_info.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
debug_locks.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
debugobjects.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
dec_and_lock.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
decompress_bunzip2.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
decompress_inflate.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
decompress_unlz4.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
decompress_unlzma.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
decompress_unlzo.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
decompress_unxz.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
decompress.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
devres.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
digsig.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
div64.c lib/div64.c: off by one in shift 2020-04-06 15:20:42 +02:00
dma-debug.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
dump_stack.c dump_stack: avoid the livelock of the dump_lock 2020-04-07 11:48:34 +02:00
dynamic_debug.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
dynamic_queue_limits.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
earlycpio.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
extable.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
fault-inject.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
fdt_empty_tree.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
fdt_ro.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
fdt_rw.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
fdt_strerror.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
fdt_sw.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
fdt_wip.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
fdt.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
find_bit.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
flex_array.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
flex_proportions.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
gcd.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
gen_crc32table.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
genalloc.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
glob.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
halfmd4.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
hexdump.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
hweight.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
idr.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
inflate.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
int_sqrt.c lib/int_sqrt: optimize initial value compute 2020-04-06 13:43:46 +02:00
interval_tree_test.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
interval_tree.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
iomap_copy.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
iomap.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
iommu-common.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
iommu-helper.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
ioremap.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
iov_iter.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
irq_regs.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
is_single_threaded.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
jedec_ddr_data.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
kasprintf.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
Kconfig A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
Kconfig.debug kmemleak: increase DEBUG_KMEMLEAK_EARLY_LOG_SIZE default to 16K 2020-04-07 07:55:16 +02:00
Kconfig.kasan A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
Kconfig.kgdb A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
Kconfig.kmemcheck A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
kfifo.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
klist.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
kobject_uevent.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
kobject.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
kstrtox.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
kstrtox.h A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
lcm.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
libcrc32c.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
list_debug.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
list_sort.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
llist.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
locking-selftest-hardirq.h A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
locking-selftest-mutex.h A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
locking-selftest-rlock-hardirq.h A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
locking-selftest-rlock-softirq.h A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
locking-selftest-rlock.h A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
locking-selftest-rsem.h A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
locking-selftest-softirq.h A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
locking-selftest-spin-hardirq.h A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
locking-selftest-spin-softirq.h A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
locking-selftest-spin.h A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
locking-selftest-wlock-hardirq.h A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
locking-selftest-wlock-softirq.h A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
locking-selftest-wlock.h A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
locking-selftest-wsem.h A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
locking-selftest.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
lockref.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
lru_cache.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
Makefile siphash: add cryptographically secure PRF 2020-04-06 21:32:41 +02:00
md5.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
memory-notifier-error-inject.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
memweight.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
net_utils.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
nlattr.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
nmi_backtrace.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
notifier-error-inject.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
notifier-error-inject.h A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
of-reconfig-notifier-error-inject.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
oid_registry.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
once.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
parser.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
pci_iomap.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
percpu_counter.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
percpu_ida.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
percpu_test.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
percpu-refcount.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
plist.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
pm-notifier-error-inject.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
proportions.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
radix-tree.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
random32.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
ratelimit.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
rational.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
rbtree_test.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
rbtree.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
reciprocal_div.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
rhashtable.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
scatterlist.c lib/scatterlist: Fix mapping iterator when sg->offset is greater than PAGE_SIZE 2020-04-06 20:04:15 +02:00
seq_buf.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
sg_split.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
sha1.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
show_mem.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
siphash.c siphash: implement HalfSipHash1-3 for hash tables 2020-04-06 21:32:43 +02:00
smp_processor_id.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
sort.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
stackdepot.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
stmp_device.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
string_helpers.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
string.c lib/string.c: implement a basic bcmp 2020-04-06 15:07:18 +02:00
strncpy_from_user.c mm/uaccess: Use 'unsigned long' to placate UBSAN warnings on older GCC versions 2020-04-06 18:18:29 +02:00
strnlen_user.c mm/uaccess: Use 'unsigned long' to placate UBSAN warnings on older GCC versions 2020-04-06 18:18:29 +02:00
swiotlb.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
syscall.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
test_bpf.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
test_firmware.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
test_kasan.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
test_module.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
test_printf.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
test_rhashtable.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
test_siphash.c siphash: implement HalfSipHash1-3 for hash tables 2020-04-06 21:32:43 +02:00
test_static_key_base.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
test_static_keys.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
test_user_copy.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
test-hexdump.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
test-kstrtox.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
test-string_helpers.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
textsearch.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
timerqueue.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
ts_bm.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
ts_fsm.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
ts_kmp.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
ucs2_string.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
usercopy.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
uuid.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
vsprintf.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
xxhash.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30