From: Alan Stern <stern@rowland.harvard.edu>
To: Dmitry Vyukov <dvyukov@google.com>
Cc: syzbot <syzbot+eb4674092e6cc8d9e0bd@syzkaller.appspotmail.com>,
Andrey Konovalov <andreyknvl@gmail.com>,
Felipe Balbi <balbi@kernel.org>,
Dan Carpenter <dan.carpenter@oracle.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
LKML <linux-kernel@vger.kernel.org>,
USB list <linux-usb@vger.kernel.org>,
syzkaller-bugs <syzkaller-bugs@googlegroups.com>,
syzkaller <syzkaller@googlegroups.com>
Subject: Re: [syzbot] general protection fault in gadget_setup
Date: Thu, 15 Apr 2021 16:59:57 -0400 [thread overview]
Message-ID: <20210415205957.GA19917@rowland.harvard.edu> (raw)
In-Reply-To: <CACT4Y+aX-cMJxMYmWms3MG-4=Rb9eG_N+pOjorRHoV1MGQXtkA@mail.gmail.com>
On Tue, Apr 13, 2021 at 07:11:11PM +0200, Dmitry Vyukov wrote:
> On Tue, Apr 13, 2021 at 6:57 PM Alan Stern <stern@rowland.harvard.edu> wrote:
> >
> > On Tue, Apr 13, 2021 at 06:47:47PM +0200, Dmitry Vyukov wrote:
> > > On Tue, Apr 13, 2021 at 6:13 PM Alan Stern <stern@rowland.harvard.edu> wrote:
> > > > Hopefully this patch will make the race a lot more likely to occur. Is
> > > > there any way to tell syzkaller to test it, despite the fact that
> > > > syzkaller doesn't think it has a reproducer for this issue?
> > >
> > > If there is no reproducer the only way syzbot can test it is if it's
> > > in linux-next under CONFIG_DEBUG_AID_FOR_SYZBOT:
> > > http://bit.do/syzbot#no-custom-patches
> >
> > There _is_ a theoretical reproducer: the test that provoked syzkaller's
> > original bug report. But syzkaller doesn't realize that it is (or may
> > be) a reproducer.
> >
> > It ought to be possible to ask syzkaller to run a particular test that
> > it has done before, with a patch applied -- and without having to add
> > anything to linux-next.
>
> Yes, this is possible:
> http://bit.do/syzbot#syzkaller-reproducers
That's not really what I had in mind. I don't want to spend the time
and effort installing syskaller on my own system; I want to tell syzbot
to run a particular syzkaller program (the one that originally led to
this bug report) on a patched kernel.
The syzbot instructions say that it can test bugs with reproducers. The
problem here is that there doesn't seem to be any way to tell it to use
a particular syzkaller program as a reproducer.
Alan Stern
> The log of tests executed before the crash is available under the
> "console output" link:
> console output: https://syzkaller.appspot.com/x/log.txt?x=124adbf6d00000
> And this log can be replayed using syz-execprog utility.
next prev parent reply other threads:[~2021-04-15 21:00 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-13 8:08 [syzbot] general protection fault in gadget_setup syzbot
2021-04-13 8:12 ` Dmitry Vyukov
2021-04-13 16:13 ` Alan Stern
2021-04-13 16:47 ` Dmitry Vyukov
2021-04-13 16:57 ` Alan Stern
2021-04-13 17:11 ` Dmitry Vyukov
2021-04-15 20:59 ` Alan Stern [this message]
2021-04-16 7:21 ` Dmitry Vyukov
2021-04-16 15:29 ` Alan Stern
2021-04-16 5:40 ` Anirudh Rayabharam
2021-04-16 15:27 ` Alan Stern
2021-04-16 17:05 ` Anirudh Rayabharam
2021-04-16 17:46 ` Alan Stern
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