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[198.145.29.99]) by mx.google.com with ESMTPS id z13si6392030pgv.508.2019.03.17.04.04.50 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 17 Mar 2019 04:04:50 -0700 (PDT) Received-SPF: pass (google.com: domain of gregkh@linuxfoundation.org designates 198.145.29.99 as permitted sender) client-ip=198.145.29.99; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=ky1660ZF; spf=pass (google.com: domain of gregkh@linuxfoundation.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org Received: from localhost (5356596B.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 53BD221019; Sun, 17 Mar 2019 11:04:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1552820690; bh=Ly+J4Z6Dq25YOFCa/OR3v5B01n9/VzcGTcpISwqf8L0=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=ky1660ZF5IxRYo3+e93lTKzAkVsPxlxhT+j/f51FHnIctlZGL5a+JjcFSv6mLBxVo awsVMkrnM6QxycAUk8YyhRmj7uqDapyinZVkW7kViogWxE0Wbg/v5Sclspoioo0PQH LrxpgScU/GEdSh51tbK+6wnJ/3SuMZUlxsaoRA/I= Date: Sun, 17 Mar 2019 12:04:47 +0100 From: Greg KH To: syzbot Cc: bp@alien8.de, devel@driverdev.osuosl.org, douly.fnst@cn.fujitsu.com, dvyukov@google.com, forest@alittletooquiet.net, hpa@zytor.com, konrad.wilk@oracle.com, len.brown@intel.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mingo@redhat.com, peterz@infradead.org, puwen@hygon.cn, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, tvboxspy@gmail.com, wang.yi59@zte.com.cn, x86@kernel.org Subject: Re: WARNING in rcu_check_gp_start_stall Message-ID: <20190317110447.GA3885@kroah.com> References: <0000000000007da94e05827ea99a@google.com> <0000000000009b8d8a058447efc5@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <0000000000009b8d8a058447efc5@google.com> User-Agent: Mutt/1.11.4 (2019-03-13) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Sun, Mar 17, 2019 at 03:43:01AM -0700, syzbot wrote: > syzbot has bisected this bug to: > > commit f1e3e92135202ff3d95195393ee62808c109208c > Author: Malcolm Priestley > Date: Wed Jul 22 18:16:42 2015 +0000 > > staging: vt6655: fix tagSRxDesc -> next_desc type > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=111856cf200000 > start commit: f1e3e921 staging: vt6655: fix tagSRxDesc -> next_desc type > git tree: upstream > final crash: https://syzkaller.appspot.com/x/report.txt?x=131856cf200000 > console output: https://syzkaller.appspot.com/x/log.txt?x=151856cf200000 > kernel config: https://syzkaller.appspot.com/x/.config?x=7132344728e7ec3f > dashboard link: https://syzkaller.appspot.com/bug?extid=111bc509cd9740d7e4aa > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16d4966cc00000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10c492d0c00000 > > Reported-by: syzbot+111bc509cd9740d7e4aa@syzkaller.appspotmail.com > Fixes: f1e3e921 ("staging: vt6655: fix tagSRxDesc -> next_desc type") I think syzbot is a bit confused here, how can this simple patch, where you do not have the hardware for this driver, cause this problem? thanks, greg k-h