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Date:   Wed, 30 Jan 2019 14:24:20 +0100
From:   Sebastian Sewior <bigeasy@linutronix.de>
To:     Heiko Carstens <heiko.carstens@de.ibm.com>
Cc:     Thomas Gleixner <tglx@linutronix.de>,
        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
Message-ID: <20190130132420.spwrq2d4oxeydk5s@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>
 <20190129151058.GG26906@osiris>
 <20190129171653.ycl64psq2liy5o5c@linutronix.de>
 <20190130094913.GC5299@osiris>
 <alpine.DEB.2.21.1901301303320.5537@nanos.tec.linutronix.de>
 <20190130125955.GD5299@osiris>
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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.

Sebastian