linux-kernel - Re: [torture] BUG: soft lockup - CPU#0 stuck for 22s! [lock_torture

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Date:	Sat, 8 Mar 2014 06:18:36 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [torture] BUG: soft lockup - CPU#0 stuck for 22s!
 [lock_torture_wr:26]

On Thu, Mar 06, 2014 at 09:15:51PM -0800, Paul E. McKenney wrote:
> On Fri, Mar 07, 2014 at 09:28:47AM +0800, Fengguang Wu wrote:
> > Greetings,
> > 
> > I got the below dmesg and the first bad commit is
> > 
> > git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/dev
> > commit 1f9c26968e1a501f3a839603c9633f21abca65b3
> > Author:     Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> > AuthorDate: Tue Mar 4 11:03:21 2014 -0800
> > Commit:     Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> > CommitDate: Wed Mar 5 07:49:28 2014 -0800
> > 
> >     torture: Increase stutter-end intensity
> 
> Hmmm...  A bit too intense, you say?  I will tone it down a bit.

Maybe too intense, or it helps trigger some other kernel hang bug in
this bisect:

+-------------------------------------+------------+------------+
|                                     | 1f9c26968e | d478a960ed |
+-------------------------------------+------------+------------+
| boot_successes                      | 9          | 2          |
| boot_failures                       | 76         | 17         |
| BUG:kernel_test_hang                | 54         | 15         |
| BUG:kernel_boot_hang                | 22         | 2          |
| page_allocation_failure:order:,mode | 2          |            |
| backtrace:vmalloc                   | 2          |            |
| backtrace:SyS_init_module           | 2          |            |
+-------------------------------------+------------+------------+

[   14.243909] can: request_module (can-proto-5) failed.
[   14.259351] can: request_module (can-proto-3) failed.

BUG: kernel test hang
Elapsed time: 3605

Unfortunately there's no much information in the dmesg - the kernel
just hangs there.

git bisect start d478a960edf1ea61ca31a07a48a8771f043dba78 0414855fdc4a40da05221fc6062cccbc0c30f169 --
git bisect good 6c2191ad9b6225860eef70a77d300c3d5ad39182  # 14:31     25+      0  Merge 'digsig/for-mimi' into devel-hourly-2014030618
git bisect  bad 8d06d39b2d95c1c3f10ce3d1969e1e381935bbaf  # 15:35     14-      2  Merge 'rcu/rcu/dev' into devel-hourly-2014030618
git bisect good 6845af00920e6b0d6e252c44784aaca3b0d2f42f  # 15:46     85+      0  Merge 'drm-intel/drm-intel-nightly' into devel-hourly-2014030618
git bisect good e5a16a9dbec8844bbd4b35ba52fef5c5f22e1e6a  # 15:54     85+      0  Merge 'ath6kl/ath-next-test' into devel-hourly-2014030618
git bisect good 5c709b0d8abc5dac4d7323fe6e3fdc8e6c4d0e59  # 16:11     85+      0  Merge 'tip/x86/efi' into devel-hourly-2014030618
git bisect good fbe938e4f6c837ca17c284c001b43bb21d5ca389  # 16:20     85+      0  Merge 'arm-soc/next/drivers' into devel-hourly-2014030618
git bisect good b46f358ae5e3558a9072f0354128d5749a584d01  # 19:16     85+      0  rcutorture: Place kvm-test-1-run.sh output into res directory
git bisect good f5604f67fe8cbd6f2088b20b9463f721aa613d4b  # 19:36     85+      0  Merge branch 'torture.2014.02.23a' into HEAD
git bisect good dd35b81c341c685bafd15bc9a6bfa79584e07b07  # 19:54     85+      0  torture: Rename RCU_BUILDONLY to TORTURE_BUILDONLY
git bisect good 8864f0996e8b7f07a536aa07553c4461cd5f4211  # 20:09     85+      0  torture: Make "--dryrun script" output self-sufficient
git bisect good b2d777a6d9d64929b9701f1905fdeda8fc3cb16d  # 20:28     85+      0  rcutorture: Print negatives for SRCU counter wraparound
git bisect good 4c79d7d89902a2e9c96b3db5115af52b3cf94da9  # 23:54     85+      0  torture: Report diagnostics from qemu
git bisect  bad 1f9c26968e1a501f3a839603c9633f21abca65b3  # 00:56     31-     23  torture: Increase stutter-end intensity
# first bad commit: [1f9c26968e1a501f3a839603c9633f21abca65b3] torture: Increase stutter-end intensity
git bisect good 4c79d7d89902a2e9c96b3db5115af52b3cf94da9  # 01:05    990+      0  torture: Report diagnostics from qemu
git bisect  bad d478a960edf1ea61ca31a07a48a8771f043dba78  # 01:05      0-     17  0day head guard for 'devel-hourly-2014030618'
git bisect good 78e760ddde020af97bd84c3ec2199cd3832fdb2e  # 01:23    990+      0  Revert "torture: Increase stutter-end intensity"
git bisect good c3bebc71c4bcdafa24b506adf0c1de3c1f77e2e0  # 01:56    990+      0  Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
git bisect  bad 1b0a7e3263168a06d3858798e48c5a21d1c78d3c  # 03:23    971-     10  Add linux-next specific files for 20140307

Thanks,
Fengguang

View attachment "dmesg-quantal-roam-33:20140307103855:i386-randconfig-st0-03070745:3.14.0-rc5-03765-gd478a96:2" of type "text/plain" (43768 bytes)

Download attachment "i386-randconfig-st0-03070745-d478a960edf1ea61ca31a07a48a8771f043dba78-BUG:-kernel-test-hang-122581.log" of type "application/octet-stream" (24683 bytes)

View attachment "config-3.14.0-rc5-03765-gd478a96" of type "text/plain" (101997 bytes)

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