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Date: Tue, 28 Mar 2017 17:07:09 +0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: Boqun Feng <boqun.feng@...il.com>
Cc: Ingo Molnar <mingo@...nel.org>,
"Peter Zijlstra (Intel)" <peterz@...radead.org>,
linux-kernel@...r.kernel.org, LKP <lkp@...org>
Subject: [locking/ww_mutex] 857811a371 BUG: kernel hang in boot stage
Greetings,
0day kernel testing robot got the below dmesg and the first bad commit is
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
commit 857811a37129f5d2ba162d7be3986eff44724014
Author: Boqun Feng <boqun.feng@...il.com>
AuthorDate: Wed Mar 1 23:01:38 2017 +0800
Commit: Ingo Molnar <mingo@...nel.org>
CommitDate: Thu Mar 2 09:00:39 2017 +0100
locking/ww_mutex: Adjust the lock number for stress test
Because there are only 12 bits in held_lock::references, so we only
support 4095 nested lock held in the same time, adjust the lock number
for ww_mutex stress test to kill one lockdep splat:
[ ] [ BUG: bad unlock balance detected! ]
[ ] kworker/u2:0/5 is trying to release lock (ww_class_mutex) at:
[ ] ww_mutex_unlock()
[ ] but there are no more locks to release!
...
Signed-off-by: Boqun Feng <boqun.feng@...il.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Chris Wilson <chris@...is-wilson.co.uk>
Cc: Fengguang Wu <fengguang.wu@...el.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Nicolai Hähnle <Nicolai.Haehnle@....com>
Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/20170301150138.hdixnmafzfsox7nn@tardis.cn.ibm.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
7fb4a2cea6 locking/lockdep: Add nest_lock integrity test
857811a371 locking/ww_mutex: Adjust the lock number for stress test
c02ed2e75e Linux 4.11-rc4
7f0c4a163a Add linux-next specific files for 20170327
+-----------------------------------------------------+------------+------------+-----------+---------------+
| | 7fb4a2cea6 | 857811a371 | v4.11-rc4 | next-20170327 |
+-----------------------------------------------------+------------+------------+-----------+---------------+
| boot_successes | 0 | 16 | 29 | 1 |
| boot_failures | 221 | 42 | 64 | 9 |
| WARNING:at_kernel/locking/lockdep.c:#__lock_acquire | 221 | | | |
| BUG:kernel_hang_in_boot_stage | 0 | 42 | 60 | 9 |
| BUG:kernel_hang_in_test_stage | 0 | 0 | 4 | |
+-----------------------------------------------------+------------+------------+-----------+---------------+
[ 319.426004] CPU 0 is now offline
[ 319.426004] CPU 0 is now offline
[ 319.427670]
<kernel hangs here>
In some other cases the kernel hangs after the "clocksource: tsc: ..."
lines:
[ 5.850623] Unpacking initramfs...
[ 5.850623] Unpacking initramfs...
[ 11.046171] debug: unmapping init [mem 0xffff9bcade91d000-0xffff9bcadffcffff]
[ 11.046171] debug: unmapping init [mem 0xffff9bcade91d000-0xffff9bcadffcffff]
[ 11.088197] Scanning for low memory corruption every 60 seconds
[ 11.088197] Scanning for low memory corruption every 60 seconds
[ 11.092145] des3_ede-x86_64: performance on this CPU would be suboptimal: disabling des3_ede-x86_64.
[ 11.092145] des3_ede-x86_64: performance on this CPU would be suboptimal: disabling des3_ede-x86_64.
[ 11.097470] camellia-x86_64: performance on this CPU would be suboptimal: disabling camellia-x86_64.
[ 11.097470] camellia-x86_64: performance on this CPU would be suboptimal: disabling camellia-x86_64.
[ 11.124182] twofish-x86_64-3way: performance on this CPU would be suboptimal: disabling twofish-x86_64-3way.
[ 11.124182] twofish-x86_64-3way: performance on this CPU would be suboptimal: disabling twofish-x86_64-3way.
[ 11.128731] PCLMULQDQ-NI instructions are not detected.
[ 11.128731] PCLMULQDQ-NI instructions are not detected.
[ 11.137487] AVX or AES-NI instructions are not detected.
[ 11.137487] AVX or AES-NI instructions are not detected.
[ 11.149155] CPU feature 'AVX registers' is not supported.
[ 11.149155] CPU feature 'AVX registers' is not supported.
[ 11.172390] CPU feature 'AVX registers' is not supported.
[ 11.172390] CPU feature 'AVX registers' is not supported.
[ 11.175234] AVX2 or AES-NI instructions are not detected.
[ 11.175234] AVX2 or AES-NI instructions are not detected.
[ 11.193555] AVX2 instructions are not detected.
[ 11.193555] AVX2 instructions are not detected.
[ 12.128030] tsc: Refined TSC clocksource calibration: 2926.330 MHz
[ 12.128030] tsc: Refined TSC clocksource calibration: 2926.330 MHz
[ 12.131287] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x2a2e6c2e1bb, max_idle_ns: 440795237926 ns
[ 12.131287] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x2a2e6c2e1bb, max_idle_ns: 440795237926 ns
# HH:MM RESULT GOOD BAD GOOD_BUT_DIRTY DIRTY_NOT_BAD
git bisect start 6ec9c2f12955a217a0b7c1512fc7d889024e15b3 v4.10 --
git bisect bad 34bbce9e344b47e8871273409632f525973afad4 # 17:11 B 4 1 0 1 Merge branch 'for-linus' of git://git.kernel.dk/linux-block
git bisect good 1802979ab1ee8ec5a72987ad518f5a91bf41cd89 # 17:34 G 52 0 52 54 Merge branch 'for-linus' of git://git.kernel.dk/linux-block
git bisect good 4f1f2b8f0818af9b0e21ba4b17ab615e29b4650d # 18:00 G 52 0 52 56 Merge tag 'watchdog-for-linus-v4.11-2' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging
git bisect good 33a8b3e99dc68abfe25e140144ad268e70660be3 # 18:19 G 53 0 53 56 Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
git bisect good 26db8f992444a87465fc01b264b0317a3943e2b6 # 18:42 G 56 0 56 56 Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect bad bd0f9b356d00aa241ced36fb075a07041c28d3b8 # 18:58 B 1 4 0 0 sched/headers: fix up header file dependency on <linux/sched/signal.h>
git bisect bad 609b07b72d3caaa8eed3a238886467946b78fa5e # 19:22 B 2 6 0 0 Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect bad 500e1af25209a048daa1f1f86083d4849d5c555b # 19:39 B 4 4 0 0 Merge branch 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect good 2b232e0c3b3a09f3e33750aa20e314f1b80e5361 # 20:04 G 51 0 51 51 locking/ww_mutex: Replace cpu_relax() with cond_resched() for tests
git bisect bad 857811a37129f5d2ba162d7be3986eff44724014 # 20:22 B 2 3 0 0 locking/ww_mutex: Adjust the lock number for stress test
git bisect good 7fb4a2cea6b18dab56d609530d077f168169ed6b # 20:47 G 52 0 52 52 locking/lockdep: Add nest_lock integrity test
# first bad commit: [857811a37129f5d2ba162d7be3986eff44724014] locking/ww_mutex: Adjust the lock number for stress test
git bisect good 7fb4a2cea6b18dab56d609530d077f168169ed6b # 21:14 G 158 0 158 212 locking/lockdep: Add nest_lock integrity test
# extra tests with CONFIG_DEBUG_INFO_REDUCED
git bisect bad 857811a37129f5d2ba162d7be3986eff44724014 # 21:35 B 5 1 0 0 locking/ww_mutex: Adjust the lock number for stress test
# extra tests on HEAD of linux-devel/devel-catchup-201703271346
git bisect bad 791a4b24aa658106743fb3917d08494fbd1f994f # 21:35 B 0 5 28 9 0day head guard for 'devel-catchup-201703271346'
# extra tests on tree/branch linus/master
git bisect bad c02ed2e75ef4c74e41e421acb4ef1494671585e8 # 21:35 B 8 60 0 3 Linux 4.11-rc4
# extra tests with first bad commit reverted
git bisect good 2b3df4779b539136f0a6152a23c069e72b254d16 # 21:55 G 55 0 55 55 Revert "locking/ww_mutex: Adjust the lock number for stress test"
# extra tests on tree/branch linux-next/master
git bisect bad 7f0c4a163aa51c7b924bbafbe2013838d7ddaed0 # 22:17 B 1 6 0 0 Add linux-next specific files for 20170327
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/lkp Intel Corporation
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