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Date:   Wed, 30 Jan 2019 14:29:21 +0100 (CET)
From:   Thomas Gleixner <tglx@linutronix.de>
To:     Sebastian Sewior <bigeasy@linutronix.de>
cc:     Heiko Carstens <heiko.carstens@de.ibm.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@kernel.org>,
        Martin Schwidefsky <schwidefsky@de.ibm.com>,
        LKML <linux-kernel@vger.kernel.org>, linux-s390@vger.kernel.org,
        Stefan Liebler <stli@linux.ibm.com>
Subject: Re: WARN_ON_ONCE(!new_owner) within wake_futex_pi() triggered
In-Reply-To: <20190130132420.spwrq2d4oxeydk5s@linutronix.de>
Message-ID: <alpine.DEB.2.21.1901301428390.5537@nanos.tec.linutronix.de>
References: <alpine.DEB.2.21.1901291012330.1669@nanos.tec.linutronix.de> <20190129102409.GB26906@osiris> <20190129103557.GF28485@hirez.programming.kicks-ass.net> <alpine.DEB.2.21.1901291402410.1513@nanos.tec.linutronix.de> <20190129132303.GE26906@osiris>
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On Wed, 30 Jan 2019, Sebastian Sewior wrote:

> On 2019-01-30 13:59:55 [+0100], Heiko Carstens wrote:
> > Last lines of trace below (full log attached):
> 
>             <...>-56956 [005] ....   658.931364: handle_futex_death: uaddr: 3ff9e880c58 pi: 1
> …
>             <...>-56956 [005] ....   658.931369: handle_futex_death: uaddr: 3ff9e8808c0 success
>             <...>-56956 [005] ....   658.931370: sched_process_exit: comm=ld64.so.1 pid=56956 prio=120
> 
> not including 3ff9e880140
> 
>             <...>-56956 [005] ....   658.931370: sched_process_exit: comm=ld64.so.1 pid=56956 prio=120
> 
>             <...>-56496 [001] ....   658.932404: sys_futex(uaddr: 3ff9e880140, op: 6, val: 1, utime: 0, uaddr2: 5, val3: 0)
>             <...>-56496 [001] ....   658.932405: attach_to_pi_owner: Missing pid 56956
>             <...>-56496 [001] ....   658.932406: handle_exit_race: uval2 vs uval 8000de7c vs 8000de7c (-1)
>             <...>-56496 [001] ....   658.932501: sys_futex -> 0xfffffffffffffffd
> …
>             <...>-56496 [001] ....   659.020750: handle_futex_death: uaddr: 3ff9e880140 pi: 1
>             <...>-56496 [001] ....   659.020750: handle_futex_death: uaddr: 3ff9e880140 uval: 8000de7c
>             <...>-56496 [001] ....   659.020750: handle_futex_death: uaddr: 3ff9e880140 success
> 
> and here we have it.

Bah. I was looking at the wrong trace. /me goes to give a talk and stares
at that mess later.
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