From: Florian Weimer <fw@deneb.enyo.de>
To: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org,
Peter Zijlstra <peterz@infradead.org>,
"Paul E . McKenney" <paulmck@linux.ibm.com>,
Boqun Feng <boqun.feng@gmail.com>,
"H . Peter Anvin" <hpa@zytor.com>, Paul Turner <pjt@google.com>,
linux-api@vger.kernel.org, Dmitry Vyukov <dvyukov@google.com>,
Neel Natu <neelnatu@google.com>,
stable@vger.kernel.org
Subject: Re: [RFC PATCH for 5.8 1/4] sched: Fix unreliable rseq cpu_id for new tasks
Date: Tue, 07 Jul 2020 09:30:13 +0200 [thread overview]
Message-ID: <87blkrzssa.fsf@mid.deneb.enyo.de> (raw)
In-Reply-To: <20200706204913.20347-2-mathieu.desnoyers@efficios.com> (Mathieu Desnoyers's message of "Mon, 6 Jul 2020 16:49:10 -0400")
* Mathieu Desnoyers:
> While integrating rseq into glibc and replacing glibc's sched_getcpu
> implementation with rseq, glibc's tests discovered an issue with
> incorrect __rseq_abi.cpu_id field value right after the first time
> a newly created process issues sched_setaffinity.
>
> For the records, it triggers after building glibc and running tests, and
> then issuing:
>
> for x in {1..2000} ; do posix/tst-affinity-static & done
>
> and shows up as:
>
> error: Unexpected CPU 2, expected 0
> error: Unexpected CPU 2, expected 0
> error: Unexpected CPU 2, expected 0
> error: Unexpected CPU 2, expected 0
> error: Unexpected CPU 138, expected 0
> error: Unexpected CPU 138, expected 0
> error: Unexpected CPU 138, expected 0
> error: Unexpected CPU 138, expected 0
As far as I can tell, the glibc reproducer no longer shows the issue
with this patch applied.
Tested-By: Florian Weimer <fweimer@redhat.com>
next prev parent reply other threads:[~2020-07-07 7:30 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-06 20:49 [RFC PATCH for 5.8 0/4] rseq cpu_id ABI fix Mathieu Desnoyers
2020-07-06 20:49 ` [RFC PATCH for 5.8 1/4] sched: Fix unreliable rseq cpu_id for new tasks Mathieu Desnoyers
2020-07-07 7:30 ` Florian Weimer [this message]
2020-07-07 10:51 ` Mathieu Desnoyers
2020-07-06 20:49 ` [RFC PATCH for 5.8 2/4] rseq: Introduce RSEQ_FLAG_REGISTER Mathieu Desnoyers
2020-07-06 20:49 ` [RFC PATCH for 5.8 3/4] rseq: Introduce RSEQ_FLAG_RELIABLE_CPU_ID Mathieu Desnoyers
2020-07-07 7:29 ` Florian Weimer
2020-07-07 10:48 ` Mathieu Desnoyers
2020-07-07 11:32 ` Florian Weimer
2020-07-07 12:06 ` Mathieu Desnoyers
2020-07-07 18:53 ` Carlos O'Donell
2020-07-07 18:59 ` Mathieu Desnoyers
2020-07-08 8:31 ` Florian Weimer
2020-07-07 19:55 ` Florian Weimer
2020-07-08 15:33 ` Mathieu Desnoyers
2020-07-08 16:22 ` Christian Brauner
2020-07-08 16:36 ` Florian Weimer
2020-07-08 17:34 ` Mathieu Desnoyers
2020-07-09 12:49 ` Christian Brauner
2020-07-09 15:15 ` Mathieu Desnoyers
2020-07-11 15:54 ` Christian Brauner
2020-07-13 18:40 ` Mathieu Desnoyers
2020-07-06 20:49 ` [RFC PATCH for 5.8 4/4] rseq: selftests: Expect reliable cpu_id field Mathieu Desnoyers
2020-07-07 6:26 ` [RFC PATCH for 5.8 0/4] rseq cpu_id ABI fix Florian Weimer
2020-07-07 14:54 ` Florian Weimer
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