From: Peter Zijlstra <peterz@infradead.org>
To: "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com>
Cc: Sasha Levin <levinsasha928@gmail.com>,
Ingo Molnar <mingo@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
"linux-kernel@vger.kernel.org List"
<linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 3/4] sched: WARN when migrating to an offline CPU
Date: Thu, 28 Sep 2017 13:42:49 +0200 [thread overview]
Message-ID: <20170928114249.qddcf4pntvuttswd@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20170928110308.lvpxf5fw7crbwsg6@sasha-lappy>
On Thu, Sep 28, 2017 at 11:03:10AM +0000, Levin, Alexander (Sasha Levin) wrote:
> On Thu, Sep 28, 2017 at 12:35:41PM +0200, Peter Zijlstra wrote:
> >On Thu, Sep 28, 2017 at 02:14:15AM -0700, Sasha Levin wrote:
> >> [2035565360.446794] Unregister pv shared memory for cpu 2
> >> [2035565360.467930] numa_remove_cpu cpu 2 node 2: mask now 6
> >> [2035565360.471431] ------------[ cut here ]------------
> >> [2035565360.472548] WARNING: CPU: 2 PID: 24 at > kernel/sched/core.c:1178 set_task_cpu (kernel/sched/core.c:1157)
> >> [2035565360.473840] Modules linked in:
> >> [2035565360.474632] CPU: 2 PID: 24 Comm: migration/2 Not tainted > 4.14.0-rc2-next-20170927+ #252
> >
> >Urgh, weird. That really shouldn't happen. Can you easily reproduce?
>
> Looks like yes. Seems like it's enough to stress CPU hotplug + trinity.
OK, I'll see if I can reproduce building kernels and hotplug stress.
Otherwise I'll try and cook up some debug patches for you.
next prev parent reply other threads:[~2017-09-28 11:42 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-07 15:03 [PATCH 0/4] sched: Fix some load-balancer vs hotplug holes Peter Zijlstra
2017-09-07 15:03 ` [PATCH 1/4] sched/fair: Avoid newidle balance for !active CPUs Peter Zijlstra
2017-09-12 18:04 ` [tip:sched/urgent] " tip-bot for Peter Zijlstra
2017-09-07 15:03 ` [PATCH 2/4] sched/fair: Plug hole between hotplug and active load_balance Peter Zijlstra
2017-09-12 18:05 ` [tip:sched/urgent] sched/fair: Plug hole between hotplug and active_load_balance() tip-bot for Peter Zijlstra
2017-09-07 15:03 ` [PATCH 3/4] sched: WARN when migrating to an offline CPU Peter Zijlstra
2017-09-12 18:05 ` [tip:sched/urgent] sched/core: WARN() " tip-bot for Peter Zijlstra
2017-09-28 9:14 ` [PATCH 3/4] sched: WARN " Sasha Levin
2017-09-28 10:35 ` Peter Zijlstra
2017-09-28 11:03 ` Levin, Alexander (Sasha Levin)
2017-09-28 11:42 ` Peter Zijlstra [this message]
2017-09-29 11:11 ` Peter Zijlstra
2017-10-07 2:07 ` Levin, Alexander (Sasha Levin)
2017-10-07 9:15 ` Peter Zijlstra
[not found] ` <20171007174327.ky6g5viokxg5ysdm@sasha-lappy>
2017-10-09 8:04 ` Peter Zijlstra
2017-10-10 1:18 ` Levin, Alexander (Sasha Levin)
2017-09-07 15:03 ` [PATCH 4/4] sched/debug: Add debugfs knob for "sched_debug" Peter Zijlstra
2017-09-12 18:05 ` [tip:sched/urgent] " tip-bot for Peter Zijlstra
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