linux-kernel - [lkp] [timers/core] 24f73b9971: INFO: rcu

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Message-ID: <20160726142456.GC16315@yexl-desktop>
Date:	Tue, 26 Jul 2016 22:24:56 +0800
From:	kernel test robot <xiaolong.ye@...el.com>
To:	Richard Cochran <rcochran@...utronix.de>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Anna-Maria Gleixner <anna-maria@...utronix.de>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	John Stultz <john.stultz@...aro.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>, lkp@...org,
	ltp@...ts.linux.it
Subject: [lkp] [timers/core]  24f73b9971: INFO: rcu_sched detected stalls on
 CPUs/tasks:


FYI, we noticed the following commit:

https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
commit 24f73b99716a9cd8cbb345c41ced6b3b5ed94006 ("timers/core: Convert to hotplug state machine")

in testcase: ltp
with following parameters: test=cpuhotplug

on test machine: 8 threads Nehalem with 4G memory

caused below changes:


+----------------------------------------------------+------------+------------+
|                                                    | 27590dc17b | 24f73b9971 |
+----------------------------------------------------+------------+------------+
| boot_successes                                     | 4          | 3          |
| boot_failures                                      | 11         | 12         |
| INFO:creating/lkp/benchmarks/ltp/output_directory  | 11         | 11         |
| INFO:creating/lkp/benchmarks/ltp/results_directory | 11         | 11         |
| INFO:ltp-pan_reported_all_tests_PASS               | 11         | 11         |
| INFO:rcu_sched_detected_stalls_on_CPUs/tasks       | 0          | 11         |
| BUG:kernel_test_crashed                            | 0          | 1          |
+----------------------------------------------------+------------+------------+

[  136.488575] INFO: rcu_sched detected stalls on CPUs/tasks:
[  136.488935]  1-O.N: (0 ticks this GP) idle=3ad/140000000000000/0 softirq=369/369 fqs=0
[  136.489392]  (detected by 0, t=100012 jiffies, g=1266, c=1265, q=0)
[  136.489756] Task dump for CPU 1:
[  136.489972] swapper/1       R  running task        0     0      1 0x00200000
[  136.490398]  ffff88013fc61d00 ffffffff81eed600 ffffffff81f9f2c0 ffff88012803fea0
[  136.490961]  ffffffff810aae2a ffff880128040000 ffff88012803feb0 ffffffff81050e16
[  136.491525]  ffff88012803fed8 ffffffff81050e3f ffff88013fc4dde0 ffff880128040000
[  136.492089] Call Trace:
[  136.492279]  [<ffffffff810aae2a>] ? idle_task_exit+0x5a/0x60
[  136.492588]  [<ffffffff81050e16>] ? play_dead_common+0x36/0x40
[  136.492903]  [<ffffffff81050e3f>] ? native_play_dead+0x1f/0x140
[  136.493221]  [<ffffffff81037f2f>] ? arch_cpu_idle_dead+0xf/0x20
[  136.493540]  [<ffffffff810c22f1>] ? cpu_startup_entry+0x2b1/0x320
[  136.493864]  [<ffffffff8104fdaf>] ? start_secondary+0x10f/0x130
[  136.494182] rcu_sched kthread starved for 100017 jiffies! g1266 c1265 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x1
[  136.494698] rcu_sched       S ffff880128013d88     0     7      2 0x00000000
[  136.495123]  ffff880128013d88 00ff880128013d58 ffff880128008000 ffff880128032480
[  136.495686]  ffff880128013df8 ffff880128014000 ffff880128013dd0 ffff88013fc50080
[  136.496249]  00000000ffffffff 0000000000000000 ffff880128013da0 ffffffff819194dc
[  136.496812] Call Trace:
[  136.497001]  [<ffffffff819194dc>] schedule+0x3c/0x90
[  136.497282]  [<ffffffff8191c904>] schedule_timeout+0x214/0x440
[  136.497598]  [<ffffffff810a7c29>] ? try_to_wake_up+0x49/0x3f0
[  136.497910]  [<ffffffff810ea990>] ? init_timer_key+0xb0/0xb0
[  136.498218]  [<ffffffff810e4b07>] rcu_gp_kthread+0x587/0xa30
[  136.498526]  [<ffffffff810e4580>] ? rcu_note_context_switch+0x110/0x110
[  136.498870]  [<ffffffff8109cc94>] kthread+0xd4/0xf0
[  136.499150]  [<ffffffff8191df7f>] ret_from_fork+0x1f/0x40
[  136.499448]  [<ffffffff8109cbc0>] ? kthread_create_on_node+0x180/0x180


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,
Xiaolong

View attachment "config-4.7.0-rc7-00223-g24f73b9" of type "text/plain" (150960 bytes)

Download attachment "dmesg.xz" of type "application/octet-stream" (21868 bytes)

View attachment "job.yaml" of type "text/plain" (3003 bytes)

View attachment "reproduce" of type "text/plain" (44 bytes)