linux-kernel - [lkp-robot] [nohz] 411fe24e6b: WARNING:at_kernel/time/tick-sched.c:#__tick_nohz_idle

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Date:   Mon, 12 Jun 2017 14:27:19 +0800
From:   kernel test robot <xiaolong.ye@...el.com>
To:     Frederic Weisbecker <fweisbec@...il.com>
Cc:     Ingo Molnar <mingo@...nel.org>, Tim Wright <tim@...bash.co.uk>,
        Pavel Machek <pavel@....cz>,
        James Hartsock <hartsjc@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Rik van Riel <riel@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>, lkp@...org
Subject: [lkp-robot] [nohz]  411fe24e6b:
 WARNING:at_kernel/time/tick-sched.c:#__tick_nohz_idle_enter


FYI, we noticed the following commit:

commit: 411fe24e6b7c283c3a1911450cdba6dd3aaea56e ("nohz: Fix collision between tick and other hrtimers, again")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master

in testcase: boot

on test machine: qemu-system-x86_64 -enable-kvm -cpu kvm64,+ssse3 -smp 2 -m 8G

caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):


+-------------------------------------------------------------+------------+------------+
|                                                             | ce6cf9a15d | 411fe24e6b |
+-------------------------------------------------------------+------------+------------+
| boot_successes                                              | 13         | 44         |
| boot_failures                                               | 0          | 8          |
| BUG:scheduling_while_atomic                                 | 0          | 6          |
| WARNING:at_kernel/time/tick-sched.c:#__tick_nohz_idle_enter | 0          | 2          |
+-------------------------------------------------------------+------------+------------+



[  587.910907] WARNING: CPU: 1 PID: 0 at kernel/time/tick-sched.c:791 __tick_nohz_idle_enter+0x2be/0x4d5
[  587.946906] Modules linked in: snd_pcsp
[  587.962853] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.12.0-rc1-00083-g411fe24e #92
[  587.992017] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014
[  588.018789] task: ffff89d7f58fd340 task.stack: ffffaa8100ca4000
[  588.037771] RIP: 0010:__tick_nohz_idle_enter+0x2be/0x4d5
[  588.050606] RSP: 0018:ffff89d7f7403f50 EFLAGS: 00010097
[  588.065053] RAX: 7fffffffffffffff RBX: ffff89d7f75d4100 RCX: 7fffffffffffffff
[  588.083982] RDX: 800000886a4d40bf RSI: 7fffff7795b2bf3f RDI: ffffffff870e5df5
[  588.102226] RBP: ffff89d7f7403f98 R08: 0000009e52c4dd1b R09: 0000000000000001
[  588.118394] R10: 0000000000000001 R11: 0000000000011f00 R12: 000000886a7b0780
[  588.134920] R13: 000000886a4d40c0 R14: 000000886a7b0780 R15: ffff89d7f740ca00
[  588.153711] FS:  0000000000000000(0000) GS:ffff89d7f7400000(0000) knlGS:0000000000000000
[  588.178631] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  588.195159] CR2: 00007fca779f0190 CR3: 0000000154423000 CR4: 00000000000006e0
[  588.213892] Call Trace:
[  588.224494]  <IRQ>
[  588.233592]  tick_nohz_irq_exit+0x23/0x25
[  588.244478]  irq_exit+0x90/0xad
[  588.255145]  scheduler_ipi+0xec/0x10e
[  588.268528]  smp_reschedule_interrupt+0x29/0x2b
[  588.281522]  reschedule_interrupt+0x93/0xa0
[  588.292409] RIP: 0010:native_safe_halt+0x6/0x8
[  588.305959] RSP: 0018:ffffaa8100ca7e98 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff02
[  588.329517] RAX: ffff89d7f58fd340 RBX: ffff89d7f58fd340 RCX: 0000000000000003
[  588.347794] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff89d7f58fd340
[  588.364869] RBP: ffffaa8100ca7e98 R08: 0000009e52aed262 R09: 0000000000000001
[  588.385186] R10: 0000000000000001 R11: 0000000000000015 R12: 0000000000000001
[  588.403848] R13: 0000000000000000 R14: ffff89d7f58fd340 R15: ffff89d7f58fd340
[  588.424047]  </IRQ>
[  588.448308]  ? trace_hardirqs_on+0xd/0xf
[  588.460079]  default_idle+0x3f/0x18b
[  588.471318]  arch_cpu_idle+0xf/0x11
[  588.481691]  default_idle_call+0x36/0x3d
[  588.495426]  do_idle+0xce/0x195
[  588.505994]  cpu_startup_entry+0x1f/0x21
[  588.518118]  start_secondary+0x108/0x10b
[  588.529977]  secondary_startup_64+0x9f/0x9f
[  588.544651] Code: ee 48 39 c6 48 89 c8 48 0f 47 c2 49 39 c4 4c 0f 47 e0 83 7b 64 00 4d 89 e6 74 51 4c 3b 63 58 75 4b 4d 3b 67 18 0f 8d 75 01 00 00 <0f> ff 80 3d fa a4 4c 01 00 75 36 4c 8b 4b 18 48 89 df c6 05 ea 
[  588.598449] ---[ end trace 8f38c8d8d4cc5cb2 ]---


To reproduce:

        git clone https://github.com/01org/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> job-script  # job-script is attached in this email



Thanks,
Xiaolong

View attachment "config-4.12.0-rc1-00083-g411fe24e" of type "text/plain" (117165 bytes)

View attachment "job-script" of type "text/plain" (4181 bytes)

Download attachment "dmesg.xz" of type "application/octet-stream" (19368 bytes)