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

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To: Ramon Fried <rfried.dev@xxxxxxxxx>
Subject: Re: [PATCH RT 1/2] tasklet: Address a race resulting in double-enqueue
From: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Date: Tue, 9 Jun 2020 19:10:43 +0200
Cc: Tom Zanussi <zanussi@xxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, linux-rt-users <linux-rt-users@xxxxxxxxxxxxxxx>, Steven Rostedt <rostedt@xxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Carsten Emde <C.Emde@xxxxxxxxx>, John Kacur <jkacur@xxxxxxxxxx>, Daniel Wagner <wagi@xxxxxxxxx>, Clark Williams <williams@xxxxxxxxxx>, Zhang Xiao <xiao.zhang@xxxxxxxxxxxxx>
In-reply-to: <61D63A44-E3D9-4E7F-BE08-B887C078F445@gmail.com>
References: <6d4c92b28c54d8ca687c29043562de943a373547.1587675252.git.zanussi@kernel.org> <CAGi-RUKn6k98H5v9kw7je1MChb4+Uq8EGhKO0nuXNMBy9M1_qw@mail.gmail.com> <b5026121af44601e4318479194357fdb956982f6.camel@kernel.org> <20200609154741.5kesuvl7txz4s3yu@linutronix.de> <e288ef193f743782df48667b6b03122bd025119f.camel@kernel.org> <20200609163446.efp76qbjzkbtl7nk@linutronix.de> <D6892A4E-18F7-4EB7-BA09-BD4DF9079BDE@gmail.com> <34E6C220-A85B-4296-AB8E-62DE6D9DC561@gmail.com> <20200609164213.bshzpfuqgioyvtpm@linutronix.de> <61D63A44-E3D9-4E7F-BE08-B887C078F445@gmail.com>

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

Follow-Ups:
- Re: [PATCH RT 1/2] tasklet: Address a race resulting in double-enqueue
  - From: Ramon Fried

References:
- [PATCH RT 1/2] tasklet: Address a race resulting in double-enqueue
  - From: zanussi
- Re: [PATCH RT 1/2] tasklet: Address a race resulting in double-enqueue
  - From: Ramon Fried
- Re: [PATCH RT 1/2] tasklet: Address a race resulting in double-enqueue
  - From: Tom Zanussi
- Re: [PATCH RT 1/2] tasklet: Address a race resulting in double-enqueue
  - From: Sebastian Andrzej Siewior
- Re: [PATCH RT 1/2] tasklet: Address a race resulting in double-enqueue
  - From: Tom Zanussi
- Re: [PATCH RT 1/2] tasklet: Address a race resulting in double-enqueue
  - From: Sebastian Andrzej Siewior
- Re: [PATCH RT 1/2] tasklet: Address a race resulting in double-enqueue
  - From: Ramon Fried
- Re: [PATCH RT 1/2] tasklet: Address a race resulting in double-enqueue
  - From: Ramon Fried
- Re: [PATCH RT 1/2] tasklet: Address a race resulting in double-enqueue
  - From: Sebastian Andrzej Siewior
- Re: [PATCH RT 1/2] tasklet: Address a race resulting in double-enqueue
  - From: Ramon Fried

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