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Date:   Wed, 30 Aug 2017 11:37:21 +0800
From:   kernel test robot <fengguang.wu@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     LKP <lkp@...org>, linux-kernel@...r.kernel.org,
        Ingo Molnar <mingo@...nel.org>, wfg@...ux.intel.com
Subject: d82fed7529 ("locking/lockdep/selftests: Fix mixed read-write
 .."):  BUG:  -1 unexpected failures (out of 262) - debugging disabled! |

Greetings,

0day kernel testing robot got the below dmesg and the first bad commit is

https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git locking/core

commit d82fed75294229abc9d757f08a4817febae6c4f4
Author:     Peter Zijlstra <peterz@...radead.org>
AuthorDate: Mon Aug 28 14:42:45 2017 +0200
Commit:     Ingo Molnar <mingo@...nel.org>
CommitDate: Tue Aug 29 15:15:17 2017 +0200

    locking/lockdep/selftests: Fix mixed read-write ABBA tests
    
    Commit:
    
      e91498589746 ("locking/lockdep/selftests: Add mixed read-write ABBA tests")
    
    adds an explicit FAILURE to the locking selftest but overlooked the
    fact that this kills lockdep. Fudge the test to avoid this.
    
    Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
    Cc: Linus Torvalds <torvalds@...ux-foundation.org>
    Cc: Peter Zijlstra <peterz@...radead.org>
    Cc: Thomas Gleixner <tglx@...utronix.de>
    Cc: hpa@...or.com
    Link: http://lkml.kernel.org/r/20170828124245.xlo2yshxq2btgmuf@hirez.programming.kicks-ass.net
    Signed-off-by: Ingo Molnar <mingo@...nel.org>

ec81048cc3  sched/completion: Avoid unnecessary stack allocation for COMPLETION_INITIALIZER_ONSTACK()
d82fed7529  locking/lockdep/selftests: Fix mixed read-write ABBA tests
d82fed7529  locking/lockdep/selftests: Fix mixed read-write ABBA tests
ddad247ed1  Merge branch 'perf/core'
+---------------------------------------------------------+------------+------------+------------+------------+
|                                                         | ec81048cc3 | d82fed7529 | d82fed7529 | ddad247ed1 |
+---------------------------------------------------------+------------+------------+------------+------------+
| boot_successes                                          | 35         | 0          | 0          | 0          |
| boot_failures                                           | 0          | 15         | 15         | 19         |
| BUG:-#unexpected_failures(out_of#)-debugging_disabled!| | 0          | 15         | 15         | 19         |
+---------------------------------------------------------+------------+------------+------------+------------+

[    0.004000]                           context:failed|  ok  |  ok  |
[    0.004000]                               try:failed|  ok  |failed|
[    0.004000]                             block:failed|  ok  |failed|
[    0.004000]                          spinlock:failed|  ok  |failed|
[    0.004000] -----------------------------------------------------------------
[    0.004000] BUG:  -1 unexpected failures (out of 262) - debugging disabled! |
[    0.004000] -----------------------------------------------------------------
[    0.004000] clocksource: hpet: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604467 ns
[    0.004000] hpet clockevent registered
[    0.004009] tsc: Detected 2693.508 MHz processor
[    0.005226] Calibrating delay loop (skipped) preset value.. 5387.01 BogoMIPS (lpj=10774032)

                                                          # HH:MM RESULT GOOD BAD GOOD_BUT_DIRTY DIRTY_NOT_BAD
git bisect start c9d2cddca4506727eae2e7d2df0620edbf49e82e cc4a41fe5541a73019a864883297bd5043aa6d98 --
git bisect  bad 5a5ab909d6bfaee8dd1332c7de7cc02ff3ec087f  # 07:17  B      0    11   28   4  Merge 'wsa/i2c/for-next' into devel-catchup-201708300632
git bisect  bad 2bf7c98887d8158669b5ded3ab55d6b211eea807  # 07:34  B      0    11   28   4  Merge 'andersson-remoteproc/rpmsg-next' into devel-catchup-201708300632
git bisect  bad 0dee929f30bd25284c2f49fee5546691222a05b0  # 07:51  B      0    11   26   2  Merge 'tip/master' into devel-catchup-201708300632
git bisect good 08cc918622aa4d5516f770f8246d41f4a30c2c61  # 08:02  G     11     0    0   0  0day base guard for 'devel-catchup-201708300632'
git bisect good 1b2f76d77a277bb70d38ad0991ed7f16bbc115a9  # 08:17  G     11     0    0   0  Merge tag 'perf-core-for-mingo-4.14-20170829' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core
git bisect  bad 8ea7c2d9a971f95ec9f6ffac60cb4847d35f0b36  # 08:27  B      0     3   16   0  manual merge of locking/core
git bisect good af07c8069f9951cff957500f3adce04b8665934c  # 08:44  G     11     0    0   0  Merge branch 'efi/core'
git bisect good 70911fdc9576f4eeb3986689a1c9a778a4a4aacb  # 09:02  G     11     0    0   0  locking/lockdep: Change the meaning of check_prev_add()'s return value
git bisect good a1d14934ea4b9db816a8dbfeab1c3e7204a0d871  # 09:16  G     11     0    0   0  workqueue/lockdep: 'Fix' flush_work() annotation
git bisect good 500912121411e0175d44b69a7810ac6068e78326  # 09:29  G     11     0    0   0  irqchip/xtensa-mx: Report that effective affinity is a single target
git bisect good d45e3dd0a26d52e508e7796cb8f86cde4b3d8a92  # 09:43  G     11     0    0   0  Merge branch 'irq/core'
git bisect good 966a967116e699762dbf4af7f9e0d1955c25aa37  # 09:55  G     11     0    0   0  smp: Avoid using two cache lines for struct call_single_data
git bisect good 1c322ac06d9af7ea259098ae5dc977855207d335  # 10:02  G     11     0    0   0  acpi/nfit: Fix COMPLETION_INITIALIZER_ONSTACK() abuse
git bisect  bad d82fed75294229abc9d757f08a4817febae6c4f4  # 10:15  B      0    11   27   3  locking/lockdep/selftests: Fix mixed read-write ABBA tests
git bisect good ec81048cc340bb03334e6ca62661ecc0a684897a  # 10:27  G     11     0    0   0  sched/completion: Avoid unnecessary stack allocation for COMPLETION_INITIALIZER_ONSTACK()
# first bad commit: [d82fed75294229abc9d757f08a4817febae6c4f4] locking/lockdep/selftests: Fix mixed read-write ABBA tests
git bisect good ec81048cc340bb03334e6ca62661ecc0a684897a  # 10:32  G     31     0    0   0  sched/completion: Avoid unnecessary stack allocation for COMPLETION_INITIALIZER_ONSTACK()
# extra tests with CONFIG_DEBUG_INFO_REDUCED
git bisect  bad d82fed75294229abc9d757f08a4817febae6c4f4  # 10:48  B      0    10   23   0  locking/lockdep/selftests: Fix mixed read-write ABBA tests
# extra tests on HEAD of linux-devel/devel-catchup-201708300632
git bisect  bad c9d2cddca4506727eae2e7d2df0620edbf49e82e  # 10:48  B      0    35   51   0  0day head guard for 'devel-catchup-201708300632'
# extra tests on tree/branch tip/locking/core
git bisect  bad d82fed75294229abc9d757f08a4817febae6c4f4  # 10:49  B      0    15   28   0  locking/lockdep/selftests: Fix mixed read-write ABBA tests
# extra tests with first bad commit reverted
git bisect good 5c767a6f4a19bda3da8982bb045a4031a536652f  # 11:19  G     11     0    0   0  Revert "locking/lockdep/selftests: Fix mixed read-write ABBA tests"
# extra tests on tree/branch tip/master
git bisect  bad ddad247ed1846f2e432e150461a3007fdca504bf  # 11:36  B      0    11   32   8  Merge branch 'perf/core'

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/lkp                          Intel Corporation

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