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[212.51.149.96]) by smtp.gmail.com with ESMTPSA id b1sm14040556wrs.74.2019.11.26.00.42.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 26 Nov 2019 00:42:55 -0800 (PST) Date: Tue, 26 Nov 2019 09:42:53 +0100 From: Daniel Vetter To: syzbot Cc: airlied@linux.ie, chris@chris-wilson.co.uk, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, jani.nikula@linux.intel.com, joonas.lahtinen@linux.intel.com, linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org, rafael.antognolli@intel.com, rodrigo.vivi@intel.com, shli@kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: WARNING in md_ioctl Message-ID: <20191126084253.GP29965@phenom.ffwll.local> Mail-Followup-To: syzbot , airlied@linux.ie, chris@chris-wilson.co.uk, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, jani.nikula@linux.intel.com, joonas.lahtinen@linux.intel.com, linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org, rafael.antognolli@intel.com, rodrigo.vivi@intel.com, shli@kernel.org, syzkaller-bugs@googlegroups.com References: <000000000000a52337056b065fb3@google.com> <000000000000f4160705983366e8@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <000000000000f4160705983366e8@google.com> X-Operating-System: Linux phenom 5.3.0-2-amd64 User-Agent: Mutt/1.12.2 (2019-09-21) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Nov 25, 2019 at 02:37:01PM -0800, syzbot wrote: > syzbot has bisected this bug to: > > commit 4b6ce6810a5dc0af387a238e8c852e0d3822381f > Author: Rafael Antognolli > Date: Mon Feb 5 23:33:30 2018 +0000 > > drm/i915/cnl: WaPipeControlBefore3DStateSamplePattern This seems very unlikely, the reproducer doesn't open a drm device, and I'd be surprised if your gcd instances have an actual i915 device in them (but I can't check because boot log isn't provided, didn't find it on the dashboard either). Since i915 is built-in I suspect this simply moved something else in the kernel image around which provokes the bug. -Daniel > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=13aeb522e00000 > start commit: c61a56ab Merge branch 'x86-urgent-for-linus' of git://git... > git tree: upstream > final crash: https://syzkaller.appspot.com/x/report.txt?x=106eb522e00000 > console output: https://syzkaller.appspot.com/x/log.txt?x=17aeb522e00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=4013180e7c7a9ff9 > dashboard link: https://syzkaller.appspot.com/bug?extid=1e46a0864c1a6e9bd3d8 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16bca207800000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14819a47800000 > > Reported-by: syzbot+1e46a0864c1a6e9bd3d8@syzkaller.appspotmail.com > Fixes: 4b6ce6810a5d ("drm/i915/cnl: > WaPipeControlBefore3DStateSamplePattern") > > For information about bisection process see: https://goo.gl/tpsmEJ#bisection > _______________________________________________ > dri-devel mailing list > dri-devel@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch