linux-kernel - Re: BUG_ON(!newowner) in fixup_pi_state

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Message-ID: <877dr1mofi.fsf@nanos.tec.linutronix.de>
Date:   Wed, 04 Nov 2020 11:00:49 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Gratian Crisan <gratian.crisan@...com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
        Brandon Streiff <brandon.streiff@...com>,
        Ingo Molnar <mingo@...hat.com>,
        Darren Hart <dvhart@...radead.org>,
        James Minor <james.minor@...com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: Re: BUG_ON(!newowner) in fixup_pi_state_owner()

On Tue, Nov 03 2020 at 17:31, Gratian Crisan wrote:
> I apologize for waking up the futex demons (and replying to my own
> email), but ...

I was staring at it already but couldn't wrap my head around it.

> Gratian Crisan writes:
> I was able to reproduce the BUG_ON(!newowner) in fixup_pi_state_owner()
> with a 5.10.0-rc1-rt1 kernel (currently testing 5.10.0-rc2-rt4).
>
> I've captured the reproducer, boot messages, OOPS, full event ftrace
> dump and some kgdb info here: https://github.com/gratian/traces
>
> The abbreviated OOPS (w/o the ftrace dump since it's too large to
> include inline; see link[1]):

Let me start at that then.

Thanks,

        tglx