From: Borislav Petkov <bp@alien8.de>
To: Dmitry Vyukov <dvyukov@google.com>
Cc: Alexander Potapenko <glider@google.com>,
Marco Elver <elver@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: Tue, 29 Sep 2020 10:33:36 +0200 [thread overview]
Message-ID: <20200929083336.GA21110@zn.tnic> (raw)
In-Reply-To: <20200928202353.GI1685@zn.tnic>
On Mon, Sep 28, 2020 at 10:23:53PM +0200, Borislav Petkov wrote:
> 2020/09/28 22:21:01 VMs 3, executed 179, corpus cover 11792, corpus signal 10881, max signal 19337, crashes 0, repro 0
Ok, so far triggered two things:
WARNING in f2fs_is_valid_blkaddr 1 2020/09/29 10:27 reproducing
WARNING in reiserfs_put_super 1 2020/09/28 22:42
you've probably seen them already.
Anyway, next question. Let's say I trigger the corruption: is there a
way to stop the guest VM which has triggered it so that I'm able to
examine it with gdb?
What about kdump? Can I dump the guest memory either with kdump or
through the qemu monitor (I believe there's a command to dump memory) so
that it can be poked at?
Because as it is, we don't have a reproducer and as I see it, the fuzzing simply
gets restarted:
2020/09/29 10:27:03 vm-3: crash: WARNING in f2fs_is_valid_blkaddr
...
2020/09/29 10:27:05 loop: phase=1 shutdown=false instances=1/4 [3] repro: pending=0 reproducing=1 queued=1
2020/09/29 10:27:05 loop: starting instance 3
so it would be good to be able to say, when a vm encounters a crash, it
should be stopped immediately so that the guest can be examined through
qemu's gdb interface, i.e.,
-gdb tcp::<portnum>
or so?
Thx.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
next prev parent reply other threads:[~2020-09-29 8:33 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-19 8:32 general protection fault in perf_misc_flags syzbot
2020-09-19 11:08 ` Borislav Petkov
2020-09-21 5:54 ` Dmitry Vyukov
2020-09-21 8:08 ` Dmitry Vyukov
2020-09-21 20:59 ` Nick Desaulniers
2020-09-21 22:13 ` Borislav Petkov
2020-09-22 18:56 ` Nick Desaulniers
2020-09-22 19:29 ` Borislav Petkov
2020-09-23 9:03 ` Borislav Petkov
2020-09-23 9:24 ` Dmitry Vyukov
2020-09-23 10:34 ` Borislav Petkov
2020-09-23 15:20 ` Dmitry Vyukov
2020-09-25 12:22 ` Dmitry Vyukov
2020-09-26 0:32 ` Nick Desaulniers
2020-09-26 6:46 ` Dmitry Vyukov
2020-09-26 17:14 ` Borislav Petkov
2020-09-26 11:21 ` Borislav Petkov
2020-09-26 12:08 ` Dmitry Vyukov
2020-09-22 5:15 ` Dmitry Vyukov
2020-09-22 5:16 ` Dmitry Vyukov
2020-09-27 14:57 ` Borislav Petkov
2020-09-28 5:18 ` Dmitry Vyukov
2020-09-28 6:06 ` Dmitry Vyukov
2020-09-28 8:38 ` Borislav Petkov
2020-09-28 8:40 ` Dmitry Vyukov
2020-09-28 8:54 ` Borislav Petkov
2020-09-28 10:33 ` Dmitry Vyukov
2020-09-28 20:23 ` Borislav Petkov
2020-09-29 8:33 ` Borislav Petkov [this message]
2020-09-29 13:29 ` Dmitry Vyukov
2020-09-30 16:17 ` Borislav Petkov
2020-09-30 16:23 ` Dmitry Vyukov
2020-09-30 16:29 ` Dmitry Vyukov
2020-09-30 16:31 ` Borislav Petkov
2020-10-01 10:23 ` Dmitry Vyukov
2020-10-01 11:05 ` Borislav Petkov
2020-09-28 20:51 ` Nick Desaulniers
2020-09-28 21:19 ` Andy Lutomirski
2020-09-28 7:25 ` Marco Elver
2020-09-28 20:32 ` Nick Desaulniers
2020-09-29 13:27 ` Dmitry Vyukov
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