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Date: Thu, 11 Sep 2014 17:53:19 +0200 From: Frederic Weisbecker <fweisbec@...il.com> To: Fengguang Wu <fengguang.wu@...el.com> Cc: Jet Chen <jet.chen@...el.com>, Su Tao <tao.su@...el.com>, Yuanhan Liu <yuanhan.liu@...el.com>, LKP <lkp@...org>, linux-kernel@...r.kernel.org Subject: Re: [nohz] WARNING: CPU: 0 PID: 0 at arch/x86/kernel/cpu/common.c:1430 warn_pre_alternatives() Hi, On Thu, Sep 11, 2014 at 03:17:04PM +0800, Fengguang Wu wrote: > Greetings, > > 0day kernel testing robot got the below dmesg and the first bad commit is > > git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git nohz/fixes-v2 > > commit 664c05b9ab2dd92aad807bd7f9aa273955949abe > Author: Frederic Weisbecker <fweisbec@...il.com> > AuthorDate: Sun Aug 17 22:02:55 2014 +0200 > Commit: Frederic Weisbecker <fweisbec@...il.com> > CommitDate: Wed Sep 10 18:52:45 2014 +0200 > > nohz: Consolidate nohz full init code > > The supports for CONFIG_NO_HZ_FULL_ALL=y and the nohz_full= kernel > parameter both have their own way to do the same thing: allocate > full dynticks cpumasks, fill them and initialize some state variables. > > Lets consolidate that all in the same place. > > While at it, convert some regular printk message to warnings when > fundamental allocations fail. > > Cc: Ingo Molnar <mingo@...nel.org> > Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com> > Cc: Peter Zijlstra <peterz@...radead.org> > Cc: Thomas Gleixner <tglx@...utronix.de> > Signed-off-by: Frederic Weisbecker <fweisbec@...il.com> > > +-----------------------------------------------------------------+------------+------------+------------+ > | | ed1fb75de3 | 664c05b9ab | dd99eb9cdf | > +-----------------------------------------------------------------+------------+------------+------------+ > | boot_successes | 60 | 0 | 0 | > | boot_failures | 0 | 20 | 23 | So you tested ed1fb75de3 and 664c05b9ab with the same config that is in attachement, right? I can't find what dd99eb9cdf refers to though. One more thing below: > | WARNING:at_arch/x86/kernel/cpu/common.c:warn_pre_alternatives() | 0 | 20 | 22 | > | BUG:kernel_boot_hang | 0 | 20 | 22 | > | backtrace:setup_default_timer_irq | 0 | 20 | 22 | > | backtrace:hpet_time_init | 0 | 20 | 22 | > | backtrace:x86_late_time_init | 0 | 20 | 22 | > | WARNING:CPU:PID:at/kbuild/ | 0 | 1 | | > | WARNING:CPU:PID:at_arch/x86/k | 0 | 1 | | > | WARNING:CPU:PID:at_arch/x86/kernel/cpu/common.c:warn_pre_al | 0 | 0 | 1 | > | BUG:kernel_boot_crashed | 0 | 0 | 1 | > +-----------------------------------------------------------------+------------+------------+------------+ > > [ 0.000000] ---------------------------------------------------- > [ 0.000000] hpet clockevent registered > [ 0.000000] ------------[ cut here ]------------ > [ 0.000000] WARNING: CPU: 0 PID: 0 at arch/x86/kernel/cpu/common.c:1430 warn_pre_alternatives+0x1e/0x20() > [ 0.000000] You're using static_cpu_has before alternatives have run! > [ 0.000000] Modules linked in: > [ 0.000000] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.17.0-rc3-00007-g664c05b #840 > [ 0.000000] 0000000000000009 ffff880012603d80 ffffffff89dfe8c6 ffff880012603dc8 > [ 0.000000] ffff880012603db8 ffffffff89a81df3 ffffffff8a414580 0000000000000000 > [ 0.000000] 0000000000000000 0000000000000000 0000000000000000 ffff880012603e18 > [ 0.000000] Call Trace: > [ 0.000000] <IRQ> [<ffffffff89dfe8c6>] dump_stack+0x4d/0x66 > [ 0.000000] [<ffffffff89a81df3>] warn_slowpath_common+0x73/0x90 > [ 0.000000] [<ffffffff89a81e57>] warn_slowpath_fmt+0x47/0x50 > [ 0.000000] [<ffffffff89acaadf>] ? rcu_check_callbacks+0x30f/0x7c0 > [ 0.000000] [<ffffffff89a1396e>] warn_pre_alternatives+0x1e/0x20 > [ 0.000000] [<ffffffff89aeddd5>] irq_work_tick+0x15/0x50 > [ 0.000000] [<ffffffff89acfae6>] update_process_times+0x56/0x70 > [ 0.000000] [<ffffffff89adae2b>] tick_periodic+0x2b/0xc0 > [ 0.000000] [<ffffffff89adb0d1>] ? tick_handle_periodic+0x21/0x60 > [ 0.000000] [<ffffffff89adb0d1>] tick_handle_periodic+0x21/0x60 > [ 0.000000] [<ffffffff89a05500>] timer_interrupt+0x10/0x20 > [ 0.000000] [<ffffffff89ac1ef4>] handle_irq_event_percpu+0x64/0x110 > [ 0.000000] [<ffffffff89ac1fd8>] handle_irq_event+0x38/0x60 > [ 0.000000] [<ffffffff89ac4c24>] handle_level_irq+0x74/0x110 > [ 0.000000] [<ffffffff89a04cf8>] handle_irq+0x58/0x150 > [ 0.000000] [<ffffffff89aa8e89>] ? vtime_account_idle+0x9/0x50 > [ 0.000000] [<ffffffff89aa8f0d>] ? vtime_common_account_irq_enter+0x3d/0x50 > [ 0.000000] [<ffffffff89a04598>] do_IRQ+0x48/0xe0 > [ 0.000000] [<ffffffff89e063ed>] common_interrupt+0x6d/0x6d > [ 0.000000] <EOI> [<ffffffff89a2f0a6>] ? native_restore_fl+0x6/0x10 > [ 0.000000] [<ffffffff89e04ea1>] _raw_spin_unlock_irqrestore+0x31/0x40 > [ 0.000000] [<ffffffff89ac3845>] __setup_irq+0x255/0x580 > [ 0.000000] [<ffffffff89ac3bac>] setup_irq+0x3c/0xa0 > [ 0.000000] [<ffffffff8a529998>] ? hpet_enable+0x29a/0x2cb > [ 0.000000] [<ffffffff8a51cb9b>] setup_default_timer_irq+0x1e/0x20 > [ 0.000000] [<ffffffff8a51cbb4>] hpet_time_init+0x17/0x19 > [ 0.000000] [<ffffffff8a51cb76>] x86_late_time_init+0xa/0x11 > [ 0.000000] [<ffffffff8a51ad8c>] start_kernel+0x383/0x3f8 > [ 0.000000] [<ffffffff8a51a120>] ? early_idt_handlers+0x120/0x120 > [ 0.000000] [<ffffffff8a51a432>] x86_64_start_reservations+0x2a/0x2c > [ 0.000000] [<ffffffff8a51a50b>] x86_64_start_kernel+0xd7/0xe4 So the issue here seems to be that something enabled irqs on boot way too early. But I tried hard to reproduce that crash without success. So I wanted to ask you, do you mind if I send you a patch to debug this? -- 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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