linux-kernel - Re: [syzbot] upstream boot error: WARNING in __context_tracking

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Message-ID: <YYuMHchsq7UKwiD8@elver.google.com>
Date:   Wed, 10 Nov 2021 10:08:45 +0100
From:   Marco Elver <elver@...gle.com>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
Cc:     Mark Rutland <mark.rutland@....com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        syzbot <syzbot+f09a12b2c77bfbbf51bd@...kaller.appspotmail.com>,
        Arnd Bergmann <arnd@...db.de>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [syzbot] upstream boot error: WARNING in __context_tracking_enter

On Tue, Apr 13, 2021 at 07:14AM +0200, Dmitry Vyukov wrote:
[...]
> Hi Russell,
> 
> Does Mark's comment make sense to you?
> lockdep_assert_preemption_disabled() also checks "&&
> this_cpu_read(hardirqs_enabled)", so is it that we also need hardirq's
> disabled around user_enter/exit?
> This issue currently prevents ARM boot on syzbot.

We've disabled lockdep on syzbot's arm32 instance now as that instance had
been dead since March:
https://github.com/google/syzkaller/commit/be386ae8800e02b4a9a3239c9565e9d40e253c84

It's running again. There may be an influx of new bugs.

Thanks,
-- Marco