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Mon, 11 Mar 2019 11:10:29 -0700 (PDT) Received: from [10.69.37.149] ([192.19.223.250]) by smtp.gmail.com with ESMTPSA id l64sm11518070pfj.179.2019.03.11.11.10.27 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 11 Mar 2019 11:10:28 -0700 (PDT) Subject: Re: general protection fault in skb_put To: Dmitry Vyukov , James Smart Cc: syzbot , Jens Axboe , Christoph Hellwig , Johan Hedberg , keith.busch@intel.com, linux-bluetooth , LKML , linux-nvme@lists.infradead.org, Marcel Holtmann , Sagi Grimberg , syzkaller-bugs References: <000000000000032b7f0583d16e0e@google.com> From: James Smart Message-ID: Date: Mon, 11 Mar 2019 11:10:26 -0700 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.5.3 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 3/11/2019 9:40 AM, Dmitry Vyukov wrote: > On Mon, Mar 11, 2019 at 5:20 PM 'James Smart' via syzkaller-bugs > wrote: >> >> On 3/11/2019 6:20 AM, syzbot wrote: >>> syzbot has bisected this bug to: >>> >>> commit 97faec531460c949d7120672b8c77e2f41f8d6d7 >>> Author: James Smart >>> Date: Thu Sep 13 23:17:38 2018 +0000 >>> >>> nvme_fc: add 'nvme_discovery' sysfs attribute to fc transport device >>> >>> bisection log: >>> https://syzkaller.appspot.com/x/bisect.txt?x=121f55db200000 >>> start commit: 97faec53 nvme_fc: add 'nvme_discovery' sysfs attribute >>> to .. >>> git tree: linux-next >>> final crash: https://syzkaller.appspot.com/x/report.txt?x=111f55db200000 >>> console output: https://syzkaller.appspot.com/x/log.txt?x=161f55db200000 >>> kernel config: https://syzkaller.appspot.com/x/.config?x=59aefae07c771af6 >>> dashboard link: >>> https://syzkaller.appspot.com/bug?extid=65788f9af9d54844389e >>> userspace arch: amd64 >>> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=178e0798c00000 >>> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11b4f0b0c00000 >>> >>> Reported-by: syzbot+65788f9af9d54844389e@syzkaller.appspotmail.com >>> Fixes: 97faec53 ("nvme_fc: add 'nvme_discovery' sysfs attribute to fc >>> transport device") >> >> can someone contact me as to what this thing is doing and how to >> interpret all the logs. nvme_fc isn't remotely in any of the logs and >> doesn't use skb's unless the underlying udev_uevents are using them. > > Hi James, > > What exactly is unclear/needs interpretation? syzbot did what is > commonly known as kernel/git bisection process. This is a new feature > so there can be some rough edges. Hopefully we can improve the > representation together. > > Thanks > Everything is unclear. You're telling me that an error occurred and that you reduced it to the git submit where the error starts appearing. Usually there would be something in the base crash, which I'm looking at in https://syzkaller.appspot.com/x/report.txt?x=111f55db200000 which would point back at something in the patch or related to it. There are no relationships. I can't quite figure out what the base test actually did that generated the failure to see if there's any possible relationship. Everything in the base crash stacktrace points to an issue in the bluetooth uart driver doing all the logging - not the patch called out. So this looks like a failure of your infrastructure. -- james