linux-kernel - Re: [ANNOUNCE] 3.8-rc4-nohz3

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Date:	Fri, 8 Mar 2013 00:59:18 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Hakan Akkan <hakanakkan@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Alessio Igor Bogani <abogani@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Chris Metcalf <cmetcalf@...era.com>,
	Christoph Lameter <cl@...ux.com>,
	Geoff Levand <geoff@...radead.org>,
	Gilad Ben Yossef <gilad@...yossef.com>,
	Ingo Molnar <mingo@...nel.org>,
	Li Zhong <zhong@...ux.vnet.ibm.com>,
	Namhyung Kim <namhyung.kim@....com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [ANNOUNCE] 3.8-rc4-nohz3

2013/1/23 Hakan Akkan <hakanakkan@...il.com>:
> Hi,
>
> This WARN_ON is triggered for every full nohz CPU in the system during
> AP boot in a 16 core machine:

Yeah it happens because we are enqueuing a timer to an offline CPU.
I'm trying to fix it, tell me if you still see the warning on the next
version.

Thanks!

>
> [    0.336895] ------------[ cut here ]------------
> [    0.341508] WARNING: at arch/x86/kernel/smp.c:123
> native_smp_send_reschedule+0x4f/0x60()
> [    0.349578] Hardware name: X8DTG-D
> [    0.315066] smpboot: Booting Node   0, Processors  #1
> [    0.352978] Modules linked in:
> [    0.356233] Pid: 0, comm: swapper/1 Not tainted 3.8.0-rc4+ #3
> [    0.361959] Call Trace:
> [    0.364404]  [<ffffffff8103c4fa>] warn_slowpath_common+0x7a/0xb0
> [    0.370399]  [<ffffffff8103c545>] warn_slowpath_null+0x15/0x20
> [    0.376213]  [<ffffffff8102435f>] native_smp_send_reschedule+0x4f/0x60
> [    0.382723]  [<ffffffff8106b328>] wake_up_nohz_cpu+0x78/0x80
> [    0.388374]  [<ffffffff8104c33a>] add_timer_on+0x8a/0xf0
> [    0.393679]  [<ffffffff8101c6f4>] mce_start_timer+0x64/0x70
> [    0.399241]  [<ffffffff8101c752>] __mcheck_cpu_init_timer+0x52/0x60
> [    0.405490]  [<ffffffff817d804a>] mcheck_cpu_init+0x360/0x3d9
> [    0.411226]  [<ffffffff817d6160>] identify_cpu+0x39d/0x3ba
> [    0.416696]  [<ffffffff817d6193>] identify_secondary_cpu+0x16/0x1d
> [    0.422855]  [<ffffffff817d9730>] smp_store_cpu_info+0x38/0x3a
> [    0.428672]  [<ffffffff817d981a>] start_secondary+0xe8/0x192
> [    0.434317] ---[ end trace 17bfa0d8291c432e ]---
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