linux-kernel - Re: [PATCH RT 1/2] tasklet: Address a race resulting in double-enqueue

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Message-ID: <20200609171043.vhvms7lowffqm6e4@linutronix.de>
Date:   Tue, 9 Jun 2020 19:10:43 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Ramon Fried <rfried.dev@...il.com>
Cc:     Tom Zanussi <zanussi@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Carsten Emde <C.Emde@...dl.org>,
        John Kacur <jkacur@...hat.com>, Daniel Wagner <wagi@...om.org>,
        Clark Williams <williams@...hat.com>,
        Zhang Xiao <xiao.zhang@...driver.com>
Subject: Re: [PATCH RT 1/2] tasklet: Address a race resulting in
 double-enqueue

On 2020-06-09 20:07:06 [+0300], Ramon Fried wrote:
> Indeed
>  I'm truly sorry, I thought our crash kernel is configured as RT as well. 
> so, as I understand, if I build the RT kernel without preempt enabled I can hit this bug? 

Don't worry, I should have been better with the details in the log.

So you should _always_ hit the warning/bug if you compile a kernel
without SMP and RT. If you enable one of these then everything should be
fine.

Sebastian