iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
linux/lib
History
Kevin Hao e8b4d457b1 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>
2019-11-12 19:18:01 +01:00
..
842
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
fonts
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
lz4
lib/lz4: make arrays static const, reduces object code size
2017-10-03 17:54:25 -07:00
lzo
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
mpi
lib/mpi: Fix karactx leak in mpi_powm
2019-07-10 09:54:40 +02:00
raid6
ARM: 8833/1: Ensure that NEON code always compiles with Clang
2019-04-05 22:31:34 +02:00
reed_solomon
rslib: Fix handling of of caller provided syndrome
2019-07-31 07:28:30 +02:00
xz
…
zlib_deflate
…
zlib_inflate
lib/zlib_inflate/inftrees.c: fix potential buffer overflow
2017-05-08 17:15:12 -07:00
zstd
lib: Add zstd modules
2017-08-15 09:02:08 -07:00
.gitignore
…
argv_split.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
asn1_decoder.c
ASN.1: check for error from ASN1_OP_END__ACT actions
2017-12-14 09:52:52 +01:00
assoc_array.c
assoc_array: Fix shortcut creation
2019-03-23 14:35:14 +01:00
atomic64_test.c
lib/atomic64_test.c: add a test that atomic64_inc_not_zero() returns an int
2017-07-14 15:05:13 -07:00
atomic64.c
locking/atomic: Implement atomic{,64,_long}_fetch_{add,sub,and,andnot,or,xor}{,_relaxed,_acquire,_release}()
2016-06-16 10:48:32 +02:00
audit.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
bcd.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
bch.c
…
bitmap.c
lib: fix stall in __bitmap_parselist()
2018-04-19 08:56:20 +02:00
bitrev.c
…
bsearch.c
kprobes: Prohibit probing on bsearch()
2019-04-05 22:31:33 +02:00
btree.c
…
bug.c
lib/bug.c: exclude non-BUG/WARN exceptions from report_bug()
2018-03-15 10:54:32 +01:00
build_OID_registry
…
bust_spinlocks.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
chacha20.c
random: replace non-blocking pool with a Chacha20-based CRNG
2016-07-03 00:57:23 -04:00
check_signature.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
checksum.c
…
clz_ctz.c
…
clz_tab.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
cmdline.c
lib/cmdline.c: remove meaningless comment
2017-09-08 18:26:49 -07:00
compat_audit.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
cordic.c
…
cpu_rmap.c
…
cpumask.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
crc4.c
lib: Add crc4 module
2017-06-09 11:52:07 +02:00
crc7.c
…
crc8.c
…
crc16.c
…
crc32.c
lib: add module support to crc32 tests
2017-02-24 17:46:57 -08:00
crc32defs.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
crc32test.c
lib: add module support to crc32 tests
2017-02-24 17:46:57 -08:00
crc-ccitt.c
…
crc-itu-t.c
…
crc-t10dif.c
…
ctype.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
debug_info.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
debug_locks.c
locking/lockdep: Fix debug_locks off performance problem
2018-11-13 11:14:51 -08:00
debugobjects.c
debugobjects: avoid recursive calls with kmemleak
2018-12-17 09:28:54 +01:00
dec_and_lock.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
decompress_bunzip2.c
…
decompress_inflate.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
decompress_unlz4.c
lib/decompress_unlz4: change module to work with new LZ4 module version
2017-02-24 17:46:57 -08:00
decompress_unlzma.c
…
decompress_unlzo.c
…
decompress_unxz.c
…
decompress.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
devres.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
digsig.c
lib/digsig: fix dereference of NULL user_key_payload
2017-10-12 17:16:40 +01:00
div64.c
lib/div64.c: off by one in shift
2019-04-20 09:15:07 +02:00
dma-debug.c
dmaengine updates for 4.12-rc1
2017-05-09 15:40:28 -07:00
dma-noop.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
dma-virt.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
dump_stack.c
dump_stack: avoid the livelock of the dump_lock
2019-11-12 19:18:01 +01:00
dynamic_debug.c
dynamic-debug-howto: fix optional/omitted ending line number to be LARGE instead of 0
2017-12-14 09:53:08 +01:00
dynamic_queue_limits.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
earlycpio.c
lib/cpio: Make find_cpio_data()'s offset arg optional
2016-06-08 11:04:19 +02:00
errseq.c
errseq: Always report a writeback error once
2018-05-09 09:51:54 +02:00
extable.c
lib/extable.c: use bsearch() library function in search_extable()
2017-07-10 16:32:35 -07:00
fault-inject.c
fault-inject: fix wrong should_fail() decision in task context
2017-08-10 15:54:06 -07:00
fdt_empty_tree.c
…
fdt_ro.c
…
fdt_rw.c
…
fdt_strerror.c
…
fdt_sw.c
…
fdt_wip.c
…
fdt.c
…
find_bit.c
lib/find_bit.c: micro-optimise find_next_*_bit
2017-02-24 17:46:57 -08:00
flex_array.c
…
flex_proportions.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
gcd.c
lib/GCD.c: use binary GCD algorithm instead of Euclidean
2016-05-20 17:58:30 -07:00
gen_crc32table.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
genalloc.c
lib/genalloc.c: make the avail variable an atomic_long_t
2017-12-14 09:53:08 +01:00
glob.c
lib: add module support to glob tests
2017-02-24 17:46:57 -08:00
globtest.c
lib: add module support to glob tests
2017-02-24 17:46:57 -08:00
hexdump.c
lib/hexdump.c: return -EINVAL in case of error in hex2bin()
2017-09-08 18:26:49 -07:00
hweight.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
idr.c
lib/idr.c: fix comment for idr_replace()
2017-10-03 17:54:25 -07:00
inflate.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
int_sqrt.c
lib/int_sqrt: optimize initial value compute
2019-04-05 22:31:24 +02:00
interval_tree_test.c
lib/rbtree-test: lower default params
2018-12-17 09:28:55 +01:00
interval_tree.c
…
iomap_copy.c
…
iomap.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
iommu-common.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
iommu-helper.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ioremap.c
ioremap: Update pgtable free interfaces with addr
2018-08-17 21:01:11 +02:00
iov_iter.c
iov_iter: optimize page_copy_sane()
2019-05-21 18:50:21 +02:00
irq_poll.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
irq_regs.c
…
is_single_threaded.c
sched/headers: Prepare to move 'init_task' and 'init_thread_union' from <linux/sched.h> to <linux/sched/task.h>
2017-03-02 08:42:38 +01:00
jedec_ddr_data.c
…
kasprintf.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
Kconfig
Merge branch 'zstd-minimal' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs
2017-09-14 17:30:49 -07:00
Kconfig.debug
kmemleak: increase DEBUG_KMEMLEAK_EARLY_LOG_SIZE default to 16K
2019-10-07 18:55:15 +02:00
Kconfig.kasan
kasan: rework Kconfig settings
2018-02-16 20:23:04 +01:00
Kconfig.kgdb
lib: update location of kgdb documentation
2017-05-16 08:44:22 -03:00
Kconfig.ubsan
Kconfig: lib/Kconfig.ubsan fix reference to ubsan documentation
2016-12-14 16:04:08 -08:00
kfifo.c
…
klist.c
scsi: klist: Make it safe to use klists in atomic context
2018-10-03 17:00:48 -07:00
kobject_uevent.c
kobject: Don't trigger kobject_uevent(KOBJ_REMOVE) twice.
2019-05-31 06:47:32 -07:00
kobject.c
kobject: Replace strncpy with memcpy
2018-12-08 13:03:35 +01:00
kstrtox.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
kstrtox.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
lcm.c
…
libcrc32c.c
crypto: Work around deallocated stack frame reference gcc bug on sparc.
2017-06-08 17:36:03 +08:00
list_debug.c
bug: switch data corruption check to __must_check
2017-02-24 17:46:56 -08:00
list_sort.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
llist.c
…
locking-selftest-hardirq.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
locking-selftest-mutex.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
locking-selftest-rlock-hardirq.h
…
locking-selftest-rlock-softirq.h
…
locking-selftest-rlock.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
locking-selftest-rsem.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
locking-selftest-rtmutex.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
locking-selftest-softirq.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
locking-selftest-spin-hardirq.h
…
locking-selftest-spin-softirq.h
…
locking-selftest-spin.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
locking-selftest-wlock-hardirq.h
…
locking-selftest-wlock-softirq.h
…
locking-selftest-wlock.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
locking-selftest-wsem.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
locking-selftest.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
lockref.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
lru_cache.c
…
Makefile
x86/mm/mem_encrypt: Disable all instrumentation for early SME setup
2019-05-25 18:25:36 +02:00
memory-notifier-error-inject.c
…
memweight.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
net_utils.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
netdev-notifier-error-inject.c
…
nlattr.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
nmi_backtrace.c
printk/nmi: Prevent deadlock when accessing the main log buffer in NMI
2018-09-05 09:26:35 +02:00
nodemask.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
notifier-error-inject.c
…
notifier-error-inject.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
of-reconfig-notifier-error-inject.c
…
oid_registry.c
509: fix printing uninitialized stack memory when OID is empty
2018-02-25 11:08:01 +01:00
once.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
parman.c
lib: Introduce priority array area manager
2017-02-03 16:35:42 -05:00
parser.c
parser: add u64 number parser
2016-12-06 10:17:03 +02:00
pci_iomap.c
…
percpu_counter.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
percpu_ida.c
sched/headers: Prepare to remove the <linux/gfp.h> include from <linux/sched.h>
2017-03-02 08:42:34 +01:00
percpu_test.c
…
percpu-refcount.c
percpu-refcount: support synchronous switch to atomic mode.
2017-03-22 19:18:43 -07:00
plist.c
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/clock.h>
2017-03-02 08:42:27 +01:00
pm-notifier-error-inject.c
…
prime_numbers.c
lib/prime_numbers: Suppress warn on kmalloc failure
2017-01-23 09:17:12 +01:00
radix-tree.c
idr: fix invalid ptr dereference on item delete
2018-05-30 07:51:49 +02:00
random32.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ratelimit.c
lib/ratelimit.c: use deferred printk() version
2017-10-03 17:54:26 -07:00
rational.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
rbtree_test.c
lib/rbtree-test: lower default params
2018-12-17 09:28:55 +01:00
rbtree.c
rbtree: add some additional comments for rebalancing cases
2017-09-08 18:26:48 -07:00
reciprocal_div.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
refcount.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
rhashtable.c
rhashtable: Still do rehash when we get EEXIST
2019-04-03 06:25:09 +02:00
sbitmap.c
sbitmap: fix improper use of smp_mb__before_atomic()
2019-05-31 06:47:10 -07:00
scatterlist.c
lib/scatterlist: Fix mapping iterator when sg->offset is greater than PAGE_SIZE
2019-07-31 07:28:37 +02:00
seq_buf.c
seq_buf: Make seq_buf_puts() null-terminate the buffer
2019-02-12 19:46:08 +01:00
sg_pool.c
…
sg_split.c
…
sha1.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
show_mem.c
lib/show_mem.c: teach show_mem to work with the given nodemask
2017-02-22 16:41:30 -08:00
siphash.c
siphash: implement HalfSipHash1-3 for hash tables
2017-01-09 13:58:57 -05:00
smp_processor_id.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
sort.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
stackdepot.c
lib/stackdepot: export save/fetch stack for drivers
2016-11-11 08:12:37 -08:00
stmp_device.c
…
string_helpers.c
mm: treewide: remove GFP_TEMPORARY allocation flag
2017-09-13 18:53:16 -07:00
string.c
lib/strscpy: Shut up KASAN false-positives in strscpy()
2019-07-31 07:28:44 +02:00
strncpy_from_user.c
mm/uaccess: Use 'unsigned long' to placate UBSAN warnings on older GCC versions
2019-05-31 06:47:24 -07:00
strnlen_user.c
mm/uaccess: Use 'unsigned long' to placate UBSAN warnings on older GCC versions
2019-05-31 06:47:24 -07:00
swiotlb.c
swiotlb: clean up reporting
2018-12-13 09:18:52 +01:00
syscall.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
test_bitmap.c
lib/test_bitmap.c: fix bitmap optimisation tests to report errors correctly
2018-05-22 18:53:58 +02:00
test_bpf.c
test_bpf: Fix testing with CONFIG_BPF_JIT_ALWAYS_ON=y on other arches
2018-11-04 14:52:43 +01:00
test_debug_virtual.c
lib: fix build failure in CONFIG_DEBUG_VIRTUAL test
2019-01-13 10:01:07 +01:00
test_firmware.c
test_firmware: fix a memory leak bug
2019-08-16 10:13:55 +02:00
test_hash.c
lib/test_hash.c: fix warning in preprocessor symbol evaluation
2016-09-01 17:52:01 -07:00
test_hexdump.c
test_hexdump: use memcpy instead of strncpy
2018-12-08 13:03:35 +01:00
test_kasan.c
kasan: remove redundant initialization of variable 'real_size'
2019-05-08 07:20:45 +02:00
test_kmod.c
lib/test_kmod.c: potential double free in error handling
2019-03-13 14:03:18 -07:00
test_list_sort.c
lib: add module support to linked list sorting tests
2017-05-08 17:15:10 -07:00
test_module.c
…
test_parman.c
lib: fix spelling mistake: "actualy" -> "actually"
2017-02-26 11:03:38 -05:00
test_printf.c
…
test_rhashtable.c
lib: test_rhashtable: Fix KASAN warning
2017-07-25 12:35:23 -07:00
test_siphash.c
siphash: implement HalfSipHash1-3 for hash tables
2017-01-09 13:58:57 -05:00
test_sort.c
Revert "lib/test_sort.c: make it explicitly non-modular"
2017-05-08 17:15:10 -07:00
test_static_key_base.c
…
test_static_keys.c
…
test_sysctl.c
test_sysctl: test against int proc_dointvec() array support
2017-07-12 16:26:00 -07:00
test_user_copy.c
lib: remove check for AVR32 arch in test_user_copy
2017-05-01 09:36:30 +02:00
test_uuid.c
uuid: fix incorrect uuid_equal conversion in test_uuid_test
2017-07-21 09:38:30 +02:00
test-kstrtox.c
…
test-string_helpers.c
…
textsearch.c
…
timerqueue.c
timerqueue: Use rb_entry_safe() instead of open-coding it
2017-01-20 08:03:42 +01:00
ts_bm.c
…
ts_fsm.c
textsearch: fix typos in library helpers
2017-10-22 03:14:07 +01:00
ts_kmp.c
textsearch: fix typos in library helpers
2017-10-22 03:14:07 +01:00
ubsan.c
ubsan: Fix nasty -Wbuiltin-declaration-mismatch GCC-9 warnings
2019-05-10 17:53:08 +02:00
ubsan.h
lib/ubsan: add type mismatch handler for new GCC/Clang
2018-02-16 20:23:09 +01:00
ucs2_string.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
usercopy.c
Fix misannotated out-of-line _copy_to_user()
2018-03-19 08:42:56 +01:00
uuid.c
uuid: hoist uuid_is_null() helper from libnvdimm
2017-06-05 16:59:05 +02:00
vsprintf.c
lib/vsprintf: Remove atomic-unsafe support for %pCr
2018-07-03 11:24:48 +02:00
win_minmax.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
xxhash.c
lib: Add xxhash module
2017-08-15 09:02:07 -07:00