linux-kernel - Re: hotplug lockdep splat (tip)

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Date:   Mon, 4 Sep 2017 09:55:02 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Mike Galbraith <efault@....de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Byungchul Park <max.byungchul.park@...il.com>
Subject: Re: hotplug lockdep splat (tip)

On Sun, Sep 03, 2017 at 08:59:35AM +0200, Mike Galbraith wrote:
> 
> [  126.626908] Unregister pv shared memory for cpu 1
> [  126.631041] 
> [  126.631269] ======================================================
> [  126.632442] WARNING: possible circular locking dependency detected
> [  126.633599] 4.13.0.g06260ca-tip-lockdep #2 Tainted: G            E  
> [  126.634380] ------------------------------------------------------
> [  126.635124] stress-cpu-hotp/3156 is trying to acquire lock:
> [  126.635804]  ((complete)&st->done){+.+.}, at: [<ffffffff8108d19a>] takedown_cpu+0x8a/0xf0
> [  126.636809] 
> [  126.636809] but task is already holding lock:
> [  126.637567]  (sparse_irq_lock){+.+.}, at: [<ffffffff81107ac7>] irq_lock_sparse+0x17/0x20
> [  126.638665] 

https://lkml.kernel.org/r/20170829193416.GC32112@worktop.programming.kicks-ass.net

I still need to write a coherent Changelog and comments for that :/