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02fe0b21739cf99c0b4fa0b71618bf7fa02a6bf4
linux/lib
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Kevin Hao 1bb77722ad dump_stack: avoid the livelock of the dump_lock 
commit 5cbf2fff3b 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: b58d977432 ("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 19:15:43 +01:00
..
842
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fonts
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lz4
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lzo
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mpi
lib/mpi: Fix karactx leak in mpi_powm
2019-07-10 09:55:46 +02:00
raid6
ARM: 8833/1: Ensure that NEON code always compiles with Clang
2019-04-05 22:29:11 +02:00
reed_solomon
rslib: Fix handling of of caller provided syndrome
2019-08-04 09:33:23 +02:00
xz
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zlib_deflate
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zlib_inflate
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.gitignore
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argv_split.c
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asn1_decoder.c
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assoc_array.c
assoc_array: Fix shortcut creation
2019-03-23 13:19:42 +01:00
atomic64_test.c
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atomic64.c
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audit.c
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bcd.c
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bch.c
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bitmap.c
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bitrev.c
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bsearch.c
kprobes: Prohibit probing on bsearch()
2019-04-05 22:29:11 +02:00
btree.c
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bug.c
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build_OID_registry
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bust_spinlocks.c
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chacha20.c
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check_signature.c
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checksum.c
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clz_ctz.c
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clz_tab.c
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cmdline.c
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compat_audit.c
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cordic.c
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cpu_rmap.c
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cpu-notifier-error-inject.c
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cpumask.c
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crc7.c
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crc8.c
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crc16.c
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crc32.c
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crc32defs.h
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crc-ccitt.c
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crc-itu-t.c
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crc-t10dif.c
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ctype.c
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debug_info.c
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debug_locks.c
locking/lockdep: Fix debug_locks off performance problem
2018-11-13 11:16:48 -08:00
debugobjects.c
debugobjects: avoid recursive calls with kmemleak
2018-12-17 09:38:35 +01:00
dec_and_lock.c
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decompress_bunzip2.c
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decompress_inflate.c
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decompress_unlz4.c
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decompress_unlzma.c
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decompress_unlzo.c
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decompress_unxz.c
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decompress.c
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devres.c
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digsig.c
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div64.c
lib/div64.c: off by one in shift
2019-04-20 09:07:54 +02:00
dma-debug.c
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dma-noop.c
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dump_stack.c
dump_stack: avoid the livelock of the dump_lock
2019-11-12 19:15:43 +01:00
dynamic_debug.c
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dynamic_queue_limits.c
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earlycpio.c
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extable.c
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fault-inject.c
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fdt_empty_tree.c
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fdt_ro.c
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fdt_rw.c
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fdt_strerror.c
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fdt_sw.c
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fdt_wip.c
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fdt.c
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find_bit.c
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flex_array.c
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flex_proportions.c
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gcd.c
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gen_crc32table.c
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genalloc.c
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glob.c
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halfmd4.c
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hexdump.c
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hweight.c
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idr.c
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inflate.c
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int_sqrt.c
lib/int_sqrt: optimize initial value compute
2019-04-05 22:29:04 +02:00
interval_tree_test.c
lib/interval_tree_test.c: allow users to limit scope of endpoint
2018-12-21 14:11:30 +01:00
interval_tree.c
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iomap_copy.c
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iomap.c
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iommu-common.c
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iommu-helper.c
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ioremap.c
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iov_iter.c
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irq_poll.c
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irq_regs.c
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is_single_threaded.c
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jedec_ddr_data.c
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kasprintf.c
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Kconfig
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Kconfig.debug
kmemleak: increase DEBUG_KMEMLEAK_EARLY_LOG_SIZE default to 16K
2019-10-07 18:53:19 +02:00
Kconfig.kasan
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Kconfig.kgdb
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Kconfig.kmemcheck
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Kconfig.ubsan
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kfifo.c
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klist.c
scsi: klist: Make it safe to use klists in atomic context
2018-10-03 17:01:45 -07:00
kobject_uevent.c
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kobject.c
kobject: Replace strncpy with memcpy
2018-12-08 13:05:05 +01:00
kstrtox.c
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kstrtox.h
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lcm.c
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libcrc32c.c
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list_debug.c
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list_sort.c
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llist.c
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locking-selftest-hardirq.h
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locking-selftest-mutex.h
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locking-selftest-rlock-hardirq.h
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locking-selftest-rlock-softirq.h
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locking-selftest-rlock.h
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locking-selftest-rsem.h
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locking-selftest-softirq.h
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locking-selftest-spin-hardirq.h
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locking-selftest-spin-softirq.h
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locking-selftest-spin.h
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locking-selftest-wlock-hardirq.h
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locking-selftest-wlock-softirq.h
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locking-selftest-wlock.h
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locking-selftest-wsem.h
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locking-selftest.c
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lockref.c
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lru_cache.c
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Makefile
siphash: add cryptographically secure PRF
2019-08-25 10:51:42 +02:00
md5.c
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memory-notifier-error-inject.c
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memweight.c
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net_utils.c
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netdev-notifier-error-inject.c
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nlattr.c
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nmi_backtrace.c
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nodemask.c
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notifier-error-inject.c
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notifier-error-inject.h
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of-reconfig-notifier-error-inject.c
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oid_registry.c
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once.c
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parser.c
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pci_iomap.c
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percpu_counter.c
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percpu_ida.c
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percpu_test.c
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percpu-refcount.c
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plist.c
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pm-notifier-error-inject.c
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radix-tree.c
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random32.c
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ratelimit.c
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rational.c
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rbtree_test.c
lib/rbtree-test: lower default params
2018-12-21 14:11:30 +01:00
rbtree.c
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reciprocal_div.c
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rhashtable.c
rhashtable: add schedule points
2018-10-18 09:13:24 +02:00
sbitmap.c
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scatterlist.c
lib/scatterlist: Fix mapping iterator when sg->offset is greater than PAGE_SIZE
2019-08-04 09:33:27 +02:00
seq_buf.c
seq_buf: Make seq_buf_puts() null-terminate the buffer
2019-02-12 19:44:57 +01:00
sg_pool.c
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sg_split.c
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sha1.c
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show_mem.c
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siphash.c
siphash: implement HalfSipHash1-3 for hash tables
2019-08-25 10:51:42 +02:00
smp_processor_id.c
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sort.c
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stackdepot.c
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stmp_device.c
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string_helpers.c
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string.c
lib/strscpy: Shut up KASAN false-positives in strscpy()
2019-08-04 09:33:32 +02:00
strncpy_from_user.c
mm/uaccess: Use 'unsigned long' to placate UBSAN warnings on older GCC versions
2019-05-31 06:48:17 -07:00
strnlen_user.c
mm/uaccess: Use 'unsigned long' to placate UBSAN warnings on older GCC versions
2019-05-31 06:48:17 -07:00
swiotlb.c
swiotlb: clean up reporting
2018-12-13 09:20:29 +01:00
syscall.c
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test_bitmap.c
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test_bpf.c
test_bpf: Fix testing with CONFIG_BPF_JIT_ALWAYS_ON=y on other arches
2018-11-10 07:42:54 -08:00
test_firmware.c
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test_hash.c
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test_hexdump.c
test_hexdump: use memcpy instead of strncpy
2018-12-08 13:05:04 +01:00
test_kasan.c
kasan: remove redundant initialization of variable 'real_size'
2019-05-08 07:19:07 +02:00
test_module.c
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test_printf.c
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test_rhashtable.c
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test_siphash.c
siphash: implement HalfSipHash1-3 for hash tables
2019-08-25 10:51:42 +02:00
test_static_key_base.c
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test_static_keys.c
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test_user_copy.c
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test_uuid.c
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test-kstrtox.c
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test-string_helpers.c
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textsearch.c
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timerqueue.c
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ts_bm.c
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ts_fsm.c
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ts_kmp.c
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ubsan.c
ubsan: Fix nasty -Wbuiltin-declaration-mismatch GCC-9 warnings
2019-05-10 17:52:07 +02:00
ubsan.h
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ucs2_string.c
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uuid.c
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vsprintf.c
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win_minmax.c
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