linux-kernel - [sched/clock] 9881b024b7: WARNING:at_kernel/sched/clock.c:#set_sched_clock

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Date:   Thu, 26 Jan 2017 05:14:06 +0800
From:   kernel test robot <xiaolong.ye@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Mike Galbraith <efault@....de>,
        Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>, lkp@...org
Subject: [sched/clock]  9881b024b7:
 WARNING:at_kernel/sched/clock.c:#set_sched_clock_stable


FYI, we noticed the following commit:

commit: 9881b024b7d7671f6a014091bc96506b89081802 ("sched/clock: Delay switching sched_clock to stable")
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master

in testcase: pm-qa
with following parameters:

	test: cpuidle



on test machine: 12 threads Intel(R) Core(TM) i7 CPU X 980 @ 3.33GHz with 6G memory

caused below changes:


+------------------------------------------------------------------+------------+------------+
|                                                                  | 555570d744 | 9881b024b7 |
+------------------------------------------------------------------+------------+------------+
| boot_successes                                                   | 3          | 9          |
| boot_failures                                                    | 1          | 16         |
| BUG:kernel_reboot-without-warning_in_test_stage                  | 1          |            |
| invoked_oom-killer:gfp_mask=0x                                   | 0          | 4          |
| Mem-Info                                                         | 0          | 4          |
| Kernel_panic-not_syncing:Out_of_memory_and_no_killable_processes | 0          | 4          |
| WARNING:at_kernel/sched/clock.c:#set_sched_clock_stable          | 0          | 12         |
+------------------------------------------------------------------+------------+------------+



[ 1457.700884] 
[ 1457.701518] masked ExtINT on CPU#1
[ 1457.701523] ------------[ cut here ]------------
[ 1457.701527] WARNING: CPU: 1 PID: 0 at kernel/sched/clock.c:114 set_sched_clock_stable+0x66/0x70
[ 1457.701527] Modules linked in: rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver netconsole sr_mod cdrom sg intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul crc32c_intel snd_hda_codec_realtek ghash_clmulni_intel ppdev mxm_wmi pcbc snd_hda_codec_generic aesni_intel crypto_simd glue_helper cryptd pcspkr ahci libahci firewire_ohci libata snd_hda_intel firewire_core crc_itu_t snd_hda_codec snd_hda_core snd_hwdep snd_pcm snd_timer snd soundcore i7core_edac edac_core shpchp winbond_cir rc_core floppy parport_pc parport wmi acpi_cpufreq ip_tables
[ 1457.701544] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G        W I     4.10.0-rc3-00259-g9881b02 #1
[ 1457.701544] Hardware name:                  /DX58SO, BIOS SOX5810J.86A.4934.2010.0129.1220 01/29/2010
[ 1457.701545] Call Trace:
[ 1457.701549]  dump_stack+0x63/0x8a
[ 1457.701550]  __warn+0xcb/0xf0
[ 1457.701551]  warn_slowpath_null+0x1d/0x20


To reproduce:

        git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
        cd lkp-tests
        bin/lkp install job.yaml  # job file is attached in this email
        bin/lkp run     job.yaml



Thanks,
Kernel Test Robot

View attachment "config-4.10.0-rc3-00259-g9881b02" of type "text/plain" (155570 bytes)

View attachment "job-script" of type "text/plain" (4098 bytes)

Download attachment "dmesg.xz" of type "application/octet-stream" (20504 bytes)

View attachment "pm-qa" of type "text/plain" (37574 bytes)

View attachment "job.yaml" of type "text/plain" (3286 bytes)

View attachment "reproduce" of type "text/plain" (27 bytes)