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
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