linux-kernel - Re: BUG: kernel NULL pointer dereference from check_preempt

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Message-ID: <87ftazctov.fsf@nanos.tec.linutronix.de>
Date:   Sat, 13 Jun 2020 09:26:40 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     paulmck@...nel.org, Peter Zijlstra <peterz@...radead.org>
Cc:     mingo@...hat.com, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        linux-kernel@...r.kernel.org
Subject: Re: BUG: kernel NULL pointer dereference from check_preempt_wakeup()

"Paul E. McKenney" <paulmck@...nel.org> writes:
> And an update based on your patch (https://paste.debian.net/1151802/)
> against 44ebe016df3a ("Merge branch 'proc-linus' of
> git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace").

I'm running this patch since midnight on top of x86/entry. Still no NULL
pointer deref.

The cross-check with plain x86/entry has triggered it on all instances
by now.

So it looks your up to something here.

Thanks,

        Thomas