From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
linux-kernel@vger.kernel.org
Cc: Dipankar Sarma <dipankar@in.ibm.com>,
Thomas Gleixner <tglx@linutronix.de>,
Andrew Morton <akpm@linux-foundation.org>,
Steffen Klassert <steffen.klassert@secunet.com>,
".linux-crypto"@vger.kernel.org
Subject: Deadlock on poweroff
Date: Sun, 7 Oct 2012 05:47:11 +0300 [thread overview]
Message-ID: <20121007024711.GA21403@shutemov.name> (raw)
Hi Paul and all,
With commit 755609a9087fa983f567dc5452b2fa7b089b591f I've got deadlock on
poweroff.
It guess it happens because of race for cpu_hotplug.lock:
CPU A CPU B
disable_nonboot_cpus()
_cpu_down()
cpu_hotplug_begin()
mutex_lock(&cpu_hotplug.lock);
__cpu_notify()
padata_cpu_callback()
__padata_remove_cpu()
padata_replace()
synchronize_rcu()
rcu_gp_kthread()
get_online_cpus();
mutex_lock(&cpu_hotplug.lock);
Have you seen the issue before?
--
Kirill A. Shutemov
next reply other threads:[~2012-10-07 2:46 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-07 2:47 Kirill A. Shutemov [this message]
[not found] ` <20121007160311.GE2485@linux.vnet.ibm.com>
2012-10-07 16:50 ` Kirill A. Shutemov
2012-10-07 17:05 ` Srivatsa S. Bhat
2012-10-07 17:11 ` Kirill A. Shutemov
2012-10-07 17:16 ` Srivatsa S. Bhat
2012-10-07 21:08 ` Paul E. McKenney
2012-10-08 4:41 ` Paul E. McKenney
2012-10-08 5:30 ` Kirill A. Shutemov
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