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Date: Wed, 18 Jan 2012 15:10:50 +0300 From: Sergey Senozhatsky <sergey.senozhatsky@...il.com> To: Ingo Molnar <mingo@...e.hu> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>, Paul Turner <pjt@...gle.com>, Suresh Siddha <suresh.b.siddha@...el.com>, Mike Galbraith <efault@....de>, linux-kernel@...r.kernel.org Subject: [PATCH] Sched fair: check that ilb cpu is online during nohz_balancer_kick() Sched fair: check that ilb cpu is online during nohz_balancer_kick() find_new_ilb() may return offlined cpu if trigger_load_balance() occurs while machine suspending or resuming, hitting native_smp_send_reschedule() assertion failure: [ 108.473465] Disabling non-boot CPUs ... [ 108.477308] CPU 1 is now offline [ 108.477497] ------------[ cut here ]------------ [ 108.477523] WARNING: at arch/x86/kernel/smp.c:120 native_smp_send_reschedule+0x25/0x56() [ 108.477724] Call Trace: [ 108.477736] <IRQ> [<ffffffff81030092>] warn_slowpath_common+0x7e/0x96 [ 108.477772] [<ffffffff810300bf>] warn_slowpath_null+0x15/0x17 [ 108.477795] [<ffffffff81018ff7>] native_smp_send_reschedule+0x25/0x56 [ 108.477823] [<ffffffff81067ffe>] trigger_load_balance+0x6ac/0x72e [ 108.477847] [<ffffffff81067bfd>] ? trigger_load_balance+0x2ab/0x72e [ 108.477874] [<ffffffff8105f05c>] scheduler_tick+0xe2/0xeb [ 108.477899] [<ffffffff8103f6ac>] update_process_times+0x60/0x70 [ 108.477926] [<ffffffff8107c1e1>] tick_sched_timer+0x6d/0x96 [ 108.477951] [<ffffffff81053b3b>] __run_hrtimer+0x1c2/0x3a1 [ 108.477974] [<ffffffff8107c174>] ? tick_nohz_handler+0xdf/0xdf [ 108.477999] [<ffffffff81054721>] hrtimer_interrupt+0xe6/0x1b0 [ 108.478023] [<ffffffff81019bdd>] smp_apic_timer_interrupt+0x80/0x93 [ 108.478051] [<ffffffff814a2f73>] apic_timer_interrupt+0x73/0x80 [ 108.478072] <EOI> [<ffffffff8148f763>] ? slab_cpuup_callback+0xa8/0xdb [ 108.478108] [<ffffffff8149f154>] notifier_call_chain+0x86/0xb3 [ 108.478133] [<ffffffff8147f09f>] ? spp_getpage+0x5f/0x5f [ 108.478157] [<ffffffff810556d9>] __raw_notifier_call_chain+0x9/0xb [ 108.478182] [<ffffffff81031857>] __cpu_notify+0x1b/0x2d [ 108.478204] [<ffffffff81031962>] cpu_notify_nofail+0xe/0x16 [ 108.478227] [<ffffffff8147f1fd>] _cpu_down+0x130/0x249 [ 108.478249] [<ffffffff814920ef>] ? printk+0x4c/0x4e [ 108.478271] [<ffffffff810319f6>] disable_nonboot_cpus+0x5a/0xfc [ 108.478297] [<ffffffff8106f000>] suspend_devices_and_enter+0x19a/0x407 [ 108.478323] [<ffffffff8106f391>] enter_state+0x124/0x169 [ 108.478346] [<ffffffff8106e01b>] state_store+0xb7/0x101 [ 108.478373] [<ffffffff8126c82f>] kobj_attr_store+0x17/0x19 [ 108.478399] [<ffffffff8117e20c>] sysfs_write_file+0x103/0x13f [ 108.478425] [<ffffffff8111f018>] vfs_write+0xad/0x13d [ 108.478447] [<ffffffff8111f293>] sys_write+0x45/0x6c [ 108.478469] [<ffffffff814a2439>] system_call_fastpath+0x16/0x1b [ 108.478492] ---[ end trace 991823fa9b0a0b79 ]--- Check that returned by find_new_ilb() cpu is online. Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com> --- diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 84adb2d..070b8e0 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -4826,7 +4826,7 @@ unlock: rcu_read_unlock(); out_done: - if (ilb < nr_cpu_ids && idle_cpu(ilb)) + if (likely(cpu_online(ilb)) && ilb < nr_cpu_ids && idle_cpu(ilb)) return ilb; return nr_cpu_ids; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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