linux-kernel - Re: WARNING: at arch/x86/kernel/smp.c:119 native_smp_send

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Message-ID: <4F34EC35.7010109@linux.vnet.ibm.com>
Date:	Fri, 10 Feb 2012 15:36:45 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	Sasha Levin <levinsasha928@...il.com>
CC:	Josh Boyer <jwboyer@...il.com>, "H. Peter Anvin" <hpa@...or.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Avi Kivity <avi@...hat.com>, kvm <kvm@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	x86 <x86@...nel.org>,
	Suresh B Siddha <suresh.b.siddha@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Subject: Re: WARNING: at arch/x86/kernel/smp.c:119 native_smp_send_reschedule+0x25/0x43()


Adding Suresh and Peter to Cc.

On 02/10/2012 01:16 AM, Sasha Levin wrote:

> On Wed, Feb 8, 2012 at 7:59 PM, Josh Boyer <jwboyer@...il.com> wrote:
>> On Wed, Feb 8, 2012 at 8:31 PM, Sasha Levin <levinsasha928@...il.com> wrote:
>>> Hi all,
>>>
>>> I got the following warning when shutting down a KVM guest with a whole bunch of cores (254 in this case).
>>>
>>> It's actually pretty easy to reproduce it, it happens every once in 2-3 shutdowns.
>>>
>>> [   32.448626] ------------[ cut here ]------------
>>> [   32.449160] WARNING: at arch/x86/kernel/smp.c:119 native_smp_send_reschedule+0x25/0x43()
>>> [   32.449621] Pid: 1, comm: init_stage2 Not tainted 3.2.0+ #14
>>> [   32.449621] Call Trace:
>>> [   32.449621]  <IRQ>  [<ffffffff81041a44>] ? native_smp_send_reschedule+0x25/0x43
>>> [   32.449621]  [<ffffffff810735b2>] warn_slowpath_common+0x7b/0x93
>>> [   32.449621]  [<ffffffff810962cc>] ? tick_nohz_handler+0xc9/0xc9
>>> [   32.449621]  [<ffffffff81073675>] warn_slowpath_null+0x15/0x18
>>> [   32.449621]  [<ffffffff81041a44>] native_smp_send_reschedule+0x25/0x43
>>> [   32.449621]  [<ffffffff81067a00>] smp_send_reschedule+0xa/0xc
>>> [   32.449621]  [<ffffffff8106f25e>] scheduler_tick+0x21a/0x242
>>> [   32.449621]  [<ffffffff8107da10>] update_process_times+0x62/0x73
>>> [   32.449621]  [<ffffffff81096336>] tick_sched_timer+0x6a/0x8a
>>> [   32.449621]  [<ffffffff8108c5eb>] __run_hrtimer.clone.26+0x55/0xcb
>>> [   32.449621]  [<ffffffff8108cd77>] hrtimer_interrupt+0xcb/0x19b
>>> [   32.449621]  [<ffffffff810428a8>] smp_apic_timer_interrupt+0x72/0x85
>>> [   32.449621]  [<ffffffff8165a8de>] apic_timer_interrupt+0x6e/0x80
>>> [   32.449621]  <EOI>  [<ffffffff8165928e>] ? _raw_spin_unlock_irqrestore+0x3a/0x3e
>>> [   32.449621]  [<ffffffff81042f4e>] ? arch_local_irq_restore+0x6/0xd
>>> [   32.449621]  [<ffffffff810430c4>] default_send_IPI_mask_allbutself_phys+0x78/0x88
>>> [   32.449621]  [<ffffffff8106c3c4>] ? __migrate_task+0xf1/0xf1
>>> [   32.449621]  [<ffffffff81045445>] physflat_send_IPI_allbutself+0x12/0x14
>>> [   32.449621]  [<ffffffff81041aaf>] native_stop_other_cpus+0x4d/0xa8
>>> [   32.449621]  [<ffffffff810411c6>] native_machine_shutdown+0x56/0x6d
>>> [   32.449621]  [<ffffffff81048499>] kvm_shutdown+0x1a/0x1c
>>> [   32.449621]  [<ffffffff810411f9>] machine_shutdown+0xa/0xc
>>> [   32.449621]  [<ffffffff81041265>] native_machine_restart+0x20/0x32
>>> [   32.449621]  [<ffffffff81041297>] machine_restart+0xa/0xc
>>> [   32.449621]  [<ffffffff81081d53>] kernel_restart+0x49/0x4d
>>> [   32.449621]  [<ffffffff81081f26>] sys_reboot+0x14b/0x18a
>>> [   32.449621]  [<ffffffff81089937>] ? remove_wait_queue+0x4c/0x51
>>> [   32.449621]  [<ffffffff8107637f>] ? do_wait+0x1a4/0x1e7
>>> [   32.449621]  [<ffffffff8107735a>] ? sys_wait4+0xa8/0xbc
>>> [   32.449621]  [<ffffffff8107522b>] ? clear_tsk_thread_flag+0xf/0xf
>>> [   32.449621]  [<ffffffff81659a25>] ? async_page_fault+0x25/0x30
>>> [   32.449621]  [<ffffffff81659e92>] system_call_fastpath+0x16/0x1b
>>> [   32.449621] ---[ end trace d0f03651493fd3d6 ]--
>>
>> You don't really point out exactly which kernel this is, but we saw this in
>> 3.3 git and it was fixed by commit 71325960d16cd68ea0e22a8da15b2495b0f363f7.
>> Or at least something very like it was.
> 
> The kernel there was vanilla 3.2 (as stated in the warning header).
> 
> I've tried it again with linux-next from today which includes the
> commit you mentioned, and still get the same error.


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