linux-kernel - Re: [v4.9-rt][report] stress-ng: possible circular locking dependency detected

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Date:   Mon, 18 Dec 2017 20:06:12 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Grygorii Strashko <grygorii.strashko@...com>
Cc:     linux-rt-users <linux-rt-users@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Sekhar Nori <nsekhar@...com>
Subject: Re: [v4.9-rt][report] stress-ng: possible circular locking
 dependency detected

On Mon, 18 Dec 2017 18:55:24 -0600
Grygorii Strashko <grygorii.strashko@...com> wrote:

> Hi All,
> 
> I've tried to run stress-ng on TI am57xx-evm (SMP, 2 cpu) and caught 2  "INFO: possible circular locking dependency detected"
> 
> Command 1 (log 1):
> ## stress-ng --class cpu --all 0 -t 5m &   stress-ng --class memory --all 0 --vm-bytes 90% -t 5m
> 
> Command 2 (log 2):
> ## stress-ng --class os --all 0 -t 5m
> 
> actually command 2 often stuck or crushes (Log3 - I've collected 3 different dumps)
> 

I hate to tell you but CPU hotplug is known to be broken on 4.9-rt and
earlier. Hopefully the v4.14-rt code with the redesigned hotplug work
fixes all this.

-- Steve