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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)
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