Re: general protection fault in perf_misc_flags

From: Marco Elver <elver@google.com>
To: Dmitry Vyukov <dvyukov@google.com>
Cc: Borislav Petkov <bp@alien8.de>,
	Alexander Potapenko <glider@google.com>,
	syzbot <syzbot+ce179bc99e64377c24bc@syzkaller.appspotmail.com>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	"H. Peter Anvin" <hpa@zytor.com>, Jiri Olsa <jolsa@redhat.com>,
	LKML <linux-kernel@vger.kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Ingo Molnar <mingo@redhat.com>,
	Namhyung Kim <namhyung@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	syzkaller-bugs <syzkaller-bugs@googlegroups.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	"the arch/x86 maintainers" <x86@kernel.org>,
	clang-built-linux <clang-built-linux@googlegroups.com>
Subject: Re: general protection fault in perf_misc_flags
Date: Mon, 28 Sep 2020 09:25:03 +0200	[thread overview]
Message-ID: <CANpmjNN9o_OUbZozzcQMHD8ynBBVeFFgp-4wK4J_U1JH=OGVsg@mail.gmail.com> (raw)
In-Reply-To: <CACT4Y+Zxt3-Dj6r53mEkwv24PazPzTxQ7usV1O+RB0bk2FzO8g@mail.gmail.com>

On Mon, 28 Sep 2020 at 07:18, Dmitry Vyukov <dvyukov@google.com> wrote:
>
> On Sun, Sep 27, 2020 at 4:57 PM Borislav Petkov <bp@alien8.de> wrote:
> >
> > On Sat, Sep 19, 2020 at 01:32:14AM -0700, syzbot wrote:
> > > Hello,
> > >
> > > syzbot found the following issue on:
> > >
> > > HEAD commit:    92ab97ad Merge tag 'sh-for-5.9-part2' of git://git.libc.or..
> > > git tree:       upstream
> > > console output: https://syzkaller.appspot.com/x/log.txt?x=1069669b900000
> > > kernel config:  https://syzkaller.appspot.com/x/.config?x=cd992d74d6c7e62
> > > dashboard link: https://syzkaller.appspot.com/bug?extid=ce179bc99e64377c24bc
> > > compiler:       clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)
> >
> > All below is AFAICT:
> >
> > This compiler you're using is not some official release but some random
> > commit before the v10 release:
> >
> > $ git show c2443155a0fb245c8f17f2c1c72b6ea391e86e81
> > Author: Hans Wennborg <hans@chromium.org>
> > Date:   Sat Nov 30 14:20:11 2019 +0100
> >
> >     Revert 651f07908a1 "[AArch64] Don't combine callee-save and local stack adjustment when optimizing for size"
> > ...
> >
> > $ git describe c2443155a0fb245c8f17f2c1c72b6ea391e86e81
> > llvmorg-10-init-10900-gc2443155a0fb
> >
> > The v10 release is:
> >
> > $ git show llvmorg-10.0.0
> > tag llvmorg-10.0.0
> > Tagger: Hans Wennborg <hans@chromium.org>
> > Date:   Tue Mar 24 12:58:58 2020 +0100
> >
> > Tag 10.0.0
> >
> > and v10 has reached v10.0.1 in the meantime:
> >
> > $ git log --oneline c2443155a0fb245c8f17f2c1c72b6ea391e86e81~1..llvmorg-10.0.1 | wc -l
> > 7051
> >
> > so can you please update your compiler and see if you can still
> > reproduce with 10.0.1 so that we don't waste time chasing a bug which
> > has been likely already fixed in one of those >7K commits.
>
> +Alex, Marco,
>
> There is suspicion that these may be caused by use of unreleased clang.
> Do we use the same clang as we use for the KMSAN instance? But this is
> not KMSAN machine, so I am not sure who/when/why updated it last to
> this revision.
> I even see we have some clang 11 version:
> https://github.com/google/syzkaller/blob/master/docs/syzbot.md#crash-does-not-reproduce

Yeah, we should replace that one as well as it wasn't yet a release-candidate.

> Is it possible to switch to some released version for both KMSAN and KASAN now?

We should probably just switch to Clang 11-rc3 or so. Then we can use
the same compiler for KMSAN and KCSAN at least.

I can package up a newer Clang.

Thanks,
-- Marco