linux-kernel - [lkp-robot] [nohz] f99973e18b: WARNING:at_kernel/time/tick-sched.c:#__tick_nohz_idle

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Message-ID: <20170613065531.GF3723@yexl-desktop>
Date:   Tue, 13 Jun 2017 14:55:31 +0800
From:   kernel test robot <xiaolong.ye@...el.com>
To:     Frederic Weisbecker <fweisbec@...il.com>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Octavian Purdila <octavian.purdila@....com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Rik van Riel <riel@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>, lkp@...org
Subject: [lkp-robot] [nohz]  f99973e18b:
 WARNING:at_kernel/time/tick-sched.c:#__tick_nohz_idle_enter


FYI, we noticed the following commit:

commit: f99973e18b65ca1fff8c81532e3132b8f622aea8 ("nohz: Fix buggy tick delay on IRQ storms")
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 host -smp 2 -m 1G

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


+-------------------------------------------------------------+------------+------------+
|                                                             | 7c25904508 | f99973e18b |
+-------------------------------------------------------------+------------+------------+
| boot_successes                                              | 44         | 49         |
| boot_failures                                               | 1          | 17         |
| BUG:scheduling_while_atomic                                 | 1          | 8          |
| WARNING:at_kernel/time/tick-sched.c:#__tick_nohz_idle_enter | 0          | 9          |
+-------------------------------------------------------------+------------+------------+



[    9.717221] WARNING: CPU: 1 PID: 0 at kernel/time/tick-sched.c:774 __tick_nohz_idle_enter+0x2a1/0x4b8
[    9.722655] Modules linked in:
[    9.725007] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.12.0-rc1-00085-gf99973e #42
[    9.729272] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014
[    9.734213] task: ffff9f99f325d340 task.stack: ffffb074801e4000
[    9.737086] RIP: 0010:__tick_nohz_idle_enter+0x2a1/0x4b8
[    9.739827] RSP: 0000:ffff9f99f3e03f70 EFLAGS: 00010093
[    9.742471] RAX: 7fffffffffffffff RBX: ffff9f99f3fd4100 RCX: 7fffffffffffffff
[    9.745646] RDX: 80000002369a0c7f RSI: 7ffffffdc965f37f RDI: ffffffffa40e5df5
[    9.748798] RBP: ffff9f99f3e03fb8 R08: 0000000325cc1cb5 R09: 0000000000000001
[    9.751892] R10: 0000000000000001 R11: 0000000000000000 R12: 00000002369a0c80
[    9.755103] R13: 00000002369a0c80 R14: 00000002369a0c80 R15: ffff9f99f3e0ca00
[    9.758294] FS:  0000000000000000(0000) GS:ffff9f99f3e00000(0000) knlGS:0000000000000000
[    9.762946] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.766166] CR2: ffffb07480220000 CR3: 000000002a423000 CR4: 00000000000006e0
[    9.769315] Call Trace:
[    9.771113]  <IRQ>
[    9.772800]  tick_nohz_irq_exit+0x23/0x25
[    9.775060]  irq_exit+0x90/0xad
[    9.777140]  smp_call_function_single_interrupt+0x33/0x35
[    9.780048]  call_function_single_interrupt+0x93/0xa0
[    9.782671] RIP: 0010:native_safe_halt+0x6/0x8
[    9.785057] RSP: 0000:ffffb074801e7e98 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff04
[    9.789327] RAX: ffff9f99f325d340 RBX: ffff9f99f325d340 RCX: 0000000000000003
[    9.792458] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff9f99f325d340
[    9.795822] RBP: ffffb074801e7e98 R08: 00000003256a8c31 R09: 0000000000000001
[    9.798935] R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000001
[    9.802043] R13: 0000000000000000 R14: ffff9f99f325d340 R15: ffff9f99f325d340
[    9.805115]  </IRQ>
[    9.806929]  ? trace_hardirqs_on+0xd/0xf
[    9.809161]  default_idle+0x3f/0x18b
[    9.811297]  arch_cpu_idle+0xf/0x11
[    9.813408]  default_idle_call+0x36/0x3d
[    9.815633]  do_idle+0xce/0x195
[    9.817645]  cpu_startup_entry+0x1f/0x21
[    9.819881]  start_secondary+0x108/0x10b
[    9.822141]  secondary_startup_64+0x9f/0x9f
[    9.824472] 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 86 a5 4c 01 00 75 36 4c 8b 4b 18 48 89 df c6 05 76 
[    9.832997] ---[ end trace f87149c9f91f86ac ]---


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-rc1-00085-gf99973e" of type "text/plain" (117165 bytes)

View attachment "job-script" of type "text/plain" (4202 bytes)

Download attachment "dmesg.xz" of type "application/octet-stream" (17944 bytes)