linux-kernel - Re: [syzbot] WARNING in ex_handler

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Message-ID: <87sg29886g.ffs@nanos.tec.linutronix.de>
Date:   Thu, 27 May 2021 00:03:03 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Andy Lutomirski <luto@...nel.org>,
        syzbot <syzbot+2067e764dbcd10721e2e@...kaller.appspotmail.com>,
        bp@...en8.de, bp@...e.de, dave.hansen@...ux.intel.com,
        fenghua.yu@...el.com, hpa@...or.com, linux-kernel@...r.kernel.org,
        mingo@...hat.com, peterz@...radead.org,
        syzkaller-bugs@...glegroups.com, tony.luck@...el.com,
        x86@...nel.org, yu-cheng.yu@...el.com
Subject: Re: [syzbot] WARNING in ex_handler_fprestore

On Tue, May 25 2021 at 17:33, Andy Lutomirski wrote:
> On 5/24/21 1:51 AM, syzbot wrote:
> I entirely believe that this bug is real and that syzbot bisected it
> correctly, but I'm puzzled by the reproducer.  It says:

The bug is real and the bisection is correct.

> ptrace$setregs(0xd, r0, 0x0, &(0x7f0000000080))
>
> I would really, really expect this to result from PTRACE_SETREGSET or
> PTRACE_SETFPREGS, but this is PTRACE_SETREGS.
>
> Am I missing something really obvious here?

That ptrace muck is a red herring and has nothing to do with it.

I decoded it fully by now and will send out coherent info (and hopefully
a patch) tomorrow with brain awake. Time for bed here...

Thanks,

        tglx