linux-kernel - Re: PANIC: double fault in fixup_bad

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Message-ID: <87imgdna6t.fsf@nanos.tec.linutronix.de>
Date:   Sat, 30 May 2020 09:39:22 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        syzbot <syzbot+dc1fa714cb070b184db5@...kaller.appspotmail.com>,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        the arch/x86 maintainers <x86@...nel.org>,
        Oleg Nesterov <oleg@...hat.com>
Subject: Re: PANIC: double fault in fixup_bad_iret

Peter Zijlstra <peterz@...radead.org> writes:
> On Fri, May 29, 2020 at 06:07:11PM +0200, Peter Zijlstra wrote:
>> Like with KCSAN, we should blanket kill KASAN/UBSAN and friends (at the
>> very least in arch/x86/) until they get that function attribute stuff
>> sorted.
>
> Something like so.

We have noinstr in kernel/rcu as well but that at least has a halfways
correct state, but still....

Thanks,

        tglx