linux-kernel - Re: v4.11.12-rt10 - hotplug lockdep splat

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Message-ID: <20170904145814.tenvql4vdkexfzeb@linutronix.de>
Date:   Mon, 4 Sep 2017 16:58:14 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Mike Galbraith <efault@....de>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: v4.11.12-rt10 - hotplug lockdep splat

On 2017-09-03 04:48:10 [+0200], Mike Galbraith wrote:
> Missed a spot.  With this on top, lockdep went silent.
> 
> kernel/hrtimer/hotplug: don't wake ktimersoftd while holding the hrtimer base lock
> 
> kernel/hrtimer: don't wakeup a process while holding the hrtimer base lock
> missed a path, namely hrtimers_dead_cpu() -> migrate_hrtimer_list().  Defer
> raising softirq until after base lock has been released there as well.
> 
> Signed-off-by: Mike Galbraith <efault@....de>
Thank you, applied.

Sebastian