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Date:   Sun, 26 Feb 2017 14:31:24 +0800
From:   kernel test robot <fengguang.wu@...el.com>
To:     Chris Wilson <chris@...is-wilson.co.uk>
Cc:     LKP <lkp@...org>, linux-kernel@...r.kernel.org,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>, wfg@...ux.intel.com
Subject: [locking/ww_mutex] f2a5fec173:  BUG: workqueue lockup - pool
 cpus=0 node=0 flags=0x0 nice=0 stuck for 59s!

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 f2a5fec17395f259d54daa8833d81b00cceb15c3
Author:     Chris Wilson <chris@...is-wilson.co.uk>
AuthorDate: Thu Dec 1 11:47:06 2016 +0000
Commit:     Ingo Molnar <mingo@...nel.org>
CommitDate: Sat Jan 14 11:37:14 2017 +0100

    locking/ww_mutex: Begin kselftests for ww_mutex
    
    Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>
    Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
    Cc: Andrew Morton <akpm@...ux-foundation.org>
    Cc: Linus Torvalds <torvalds@...ux-foundation.org>
    Cc: Maarten Lankhorst <dev@...ankhorst.nl>
    Cc: Nicolai Hähnle <nhaehnle@...il.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/20161201114711.28697-4-chris@chris-wilson.co.uk
    Signed-off-by: Ingo Molnar <mingo@...nel.org>

0186a6cbdc  locking/ww_mutex: Add ww_mutex to locktorture test
f2a5fec173  locking/ww_mutex: Begin kselftests for ww_mutex
+-------------------------------+------------+------------+
|                               | 0186a6cbdc | f2a5fec173 |
+-------------------------------+------------+------------+
| boot_successes                | 120        | 0          |
| boot_failures                 | 0          | 112        |
| BUG:workqueue_lockup-pool     | 0          | 97         |
| BUG:kernel_hang_in_boot_stage | 0          | 15         |
+-------------------------------+------------+------------+

[    3.036274] PCI: CLS 0 bytes, default 64
[    3.038041] Unpacking initramfs...
[    3.058066] workqueue: round-robin CPU selection forced, expect performance impact
[    3.149167] debug: unmapping init [mem 0xcfc9d000-0xcffcffff]
[    3.152572] cryptomgr_test (23) used greatest stack depth: 7652 bytes left
[   63.606059] BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 59s!
[   63.610183] Showing busy workqueues and worker pools:
[   63.611720] workqueue events: flags=0x0
[   63.613064]   pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=2/256
[   63.614743]     in-flight: 22:test_mutex_work
[   63.616153]     pending: tsc_refine_calibration_work

git bisect start e7a9cdaf617bb866348b56c41806f9405df24e38 c470abd4fde40ea6a0846a2beab642a578c0b8cd --
git bisect  bad c6ab4540dc999ad60e5f4e20d29b8039fb093b30  # 00:57      0-      7  Merge 'dax/fd-alloc' into devel-spot-201702251707
git bisect good bd66678f66ab6a7aab38d8d8e7bd82086300ad2f  # 01:12     20+      0  Merge 'chanwoo-extcon/extcon-next' into devel-spot-201702251707
git bisect  bad 57efc9635834ab4a24fa94ed200b32585d67b175  # 01:26      0-      7  Merge 'jlayton/ceph-4.11' into devel-spot-201702251707
git bisect good d0ca01d183ec3766f03c1ffe66921ce0f43b8d50  # 01:45     20+      2  Merge 'linux-review/Bjorn-Andersson/arm64-dts-msm8996-Add-modem-and-slpi-smp2p-nodes/20170225-083258' into devel-spot-201702251707
git bisect  bad 229797d6c89ad2304c27c1d355d7684f20097fa3  # 02:09      0-     10  Merge 'linux-review/Eric-Biggers/crypto-constify-test-vectors/20170225-075240' into devel-spot-201702251707
git bisect  bad eb4085c137f82fa834cceb1d8e5f4b1264fbd297  # 02:22      0-     13  Merge 'linux-review/Niklas-Cassel/locking-rwsem-fix-down_write_killable-for-CONFIG_RWSEM_GENERIC_SPINLOCK/20170225-082246' into devel-spot-201702251707
git bisect  bad f2a5fec17395f259d54daa8833d81b00cceb15c3  # 02:31      0-      6  locking/ww_mutex: Begin kselftests for ww_mutex
git bisect good 3822da3ed0676e01f83fe0518c333c8e9ba249bf  # 02:53     20+      0  locking/ww_mutex: Extract stamp comparison to __ww_mutex_stamp_after()
git bisect good 427b18207a87f6306bd53a74e03dbe17392b0045  # 03:23     20+      0  locking/mutex: Improve inlining
git bisect good 977625a693283dbb35b2a3f674bc0237f7347348  # 11:46     22+      1  locking/mutex: Initialize mutex_waiter::ww_ctx with poison when debugging
git bisect good 0186a6cbdc6287fde65858e5d9c714dc167b8ace  # 12:45     20+      0  locking/ww_mutex: Add ww_mutex to locktorture test
# first bad commit: [f2a5fec17395f259d54daa8833d81b00cceb15c3] locking/ww_mutex: Begin kselftests for ww_mutex
git bisect good 0186a6cbdc6287fde65858e5d9c714dc167b8ace  # 14:12     60+      0  locking/ww_mutex: Add ww_mutex to locktorture test
# extra tests on HEAD of linux-devel/devel-spot-201702251707
git bisect  bad e7a9cdaf617bb866348b56c41806f9405df24e38  # 14:13      0-     45  0day head guard for 'devel-spot-201702251707'
# extra tests on tree/branch linus/master
git bisect  bad c4f3f22eddc982d247ffe2a6690c3e4a5c46dd09  # 14:31      0-      1  Merge tag 'linux-kselftest-4.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest
# extra tests on tree/branch linux-next/master
git bisect  bad 3e7350242c6f3d41d28e03418bd781cc1b7bad5f  # 14:31      0-     44  Add linux-next specific files for 20170224

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

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