linux-kernel - rcu-torture boot hang

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Date:	Tue, 12 Jun 2012 20:11:22 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Lai Jiangshan <laijs@...fujitsu.com>
Subject: rcu-torture boot hang

Hi Paul,

In kernel boot tests with the attached config, I find the 3.5-rc2+
kernels all hang here:

[    6.522546] rcu-torture:--- Start of test: nreaders=2
nfakewriters=4 stat_interval=0 verbose=0 test_no_idle_hz=0
shuffle_interval=3 stutter=5 irqreader=1 fqs_duration=0 fqs_holdoff=0
fqs_stutter=3 test_boost=1/0 test_boost_interval=7
test_boost_duration=4 shutdown_secs=0 onoff_interval=0 onoff_holdoff=0

And interestingly, the boot option 'rcutorture.rcutorture_runnable=0'
cannot disable the boot time torture test.

If it's a new problem to you, I'll try bisecting it.

Thanks,
Fengguang

View attachment "config-3.5.0-rc2+" of type "text/plain" (89214 bytes)

View attachment "dmesg-kvm" of type "text/plain" (222566 bytes)