linux-kernel - do_boot_cpu can deadlock?

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Message-ID: <20081023170212.GA22599@redhat.com>
Date:	Thu, 23 Oct 2008 19:02:12 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Gautham R Shenoy <ego@...ibm.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	linux-kernel@...r.kernel.org, travis@....com,
	Ingo Molnar <mingo@...e.hu>
Subject: do_boot_cpu can deadlock?

Hmm. arch/x86/kernel/smpboot.c:do_boot_cpu() can deadlock ?

It is called from _cpu_up() under cpu_hotplug_begin(), and it
waits for c_idle.work. Again, if we have the pending work which
needs get_online_cpus() we seem to have problems.

Oleg.

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