linux-kernel - Re: [PATCH 0/8] sched: Fix hot-unplug regressions

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <YAMFhsXamvCT2tzM@hirez.programming.kicks-ass.net>
Date:   Sat, 16 Jan 2021 16:25:58 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     mingo@...nel.org, tglx@...utronix.de
Cc:     linux-kernel@...r.kernel.org, jiangshanlai@...il.com,
        valentin.schneider@....com, cai@...hat.com,
        vincent.donnefort@....com, decui@...rosoft.com, paulmck@...nel.org,
        vincent.guittot@...aro.org, rostedt@...dmis.org, tj@...nel.org
Subject: Re: [PATCH 0/8] sched: Fix hot-unplug regressions

On Sat, Jan 16, 2021 at 12:30:33PM +0100, Peter Zijlstra wrote:
> Hi,
> 
> These patches (no longer 4), seems to fix all the hotplug regressions as per
> nearly a 100 18*SRCU-P runs over-night.
> 
> I did clean up the patches, so possibly I wrecked it again. I've started new
> runs and will again leave them running over-night.

Hurph... I've got one splat from this version, one I've not seen before:

[   68.712848] Dying CPU not properly vacated!
...
[   68.744448] CPU1 enqueued tasks (2 total):
[   68.745018]  pid: 14, name: rcu_preempt
[   68.745557]  pid: 18, name: migration/1

Paul, rcu_preempt, is from rcu_spawn_gp_kthread(), right? Afaict that
doesn't even have affinity.. /me wonders HTH that ended up on the
runqueue so late.