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Date:   Mon, 18 Sep 2017 12:29:31 -0400
From:   Steven Rostedt <>
To:     "Paul E. McKenney" <>
Cc:     Neeraj Upadhyay <>,,,,,,,,,
Subject: Re: Query regarding synchronize_sched_expedited and resched_cpu

On Mon, 18 Sep 2017 09:24:12 -0700
"Paul E. McKenney" <> wrote:

> As soon as I work through the backlog of lockdep complaints that
> appeared in the last merge window...  :-(
> sparse_irq_lock, I am looking at you!!!  ;-)

I just hit one too, and decided to write a patch to show a chain of 3
when applicable.

For example:

 Chain exists of:
   cpu_hotplug_lock.rw_sem --> smpboot_threads_lock --> (complete)&self->parked
  Possible unsafe locking scenario by crosslock:
        CPU0                    CPU1                    CPU2
        ----                    ----                    ----
  *** DEADLOCK ***


-- Steve

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