linux-kernel - Re: [RFC PATCH v2 00/17] Core scheduling v2

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Date:   Wed, 24 Apr 2019 11:19:13 +0000
From:   Vineeth Remanan Pillai <vpillai@...italocean.com>
To:     Aubrey Li <aubrey.intel@...il.com>
Cc:     Vineeth Remanan Pillai <vpillai@...italocean.com>,
        Nishanth Aravamudan <naravamudan@...italocean.com>,
        Julien Desfossez <jdesfossez@...italocean.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>, mingo@...nel.org,
        tglx@...utronix.de, pjt@...gle.com, torvalds@...ux-foundation.org,
        linux-kernel@...r.kernel.org, subhra.mazumdar@...cle.com,
        fweisbec@...il.com, keescook@...omium.org, kerrnel@...gle.com,
        Aaron Lu <aaron.lwe@...il.com>,
        Valentin Schneider <valentin.schneider@....com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Phil Auld <pauld@...hat.com>
Subject: Re: [RFC PATCH v2 00/17] Core scheduling v2

> Is this one missed? Or fixed with a better impl?
>
> The boot up CPUs don't match the possible cpu map, so the not onlined
> CPU rq->core are not initialized, which causes NULL pointer dereference
> panic in online_fair_sched_group():
>
Thanks for pointing this out. I think the ideal fix would be to
correctly initialize/cleanup the coresched attributes in the cpu
hotplug code path so that lock could be taken successfully if the
sibling is offlined/onlined after coresched was enabled. We are
working on another bug related to hotplugpath and shall introduce
the fix in v3.

Thanks