linux-kernel - Re: rtmutex, pi_blocked_on, and blk_flush

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Message-ID: <20230323145057.CNQ_eJce@linutronix.de>
Date:   Thu, 23 Mar 2023 15:50:57 +0100
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Crystal Wood <swood@...hat.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        John Keeping <john@...anate.com>,
        linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: rtmutex, pi_blocked_on, and blk_flush_plug()

On 2023-03-22 17:41:31 [+0100], To Crystal Wood wrote:
> On 2023-03-04 23:39:57 [-0600], Crystal Wood wrote:
> > Are there any workloads I could run to stress out that path (with my
> > asserts in place)?
> 
> None that I can think of. Maybe something from the io-ring test suite.
> But then you may need to bend to code to get the task_add() to fail.
> Maybe Jens knows something.

quick question: Can you throw your testing on the patch I sent checking
if this really cures the problem you see?

> > -Scott

Sebastian