Greetings, 0day kernel testing robot got the below dmesg and the first bad commit is git://anongit.freedesktop.org/drm-intel topic/drm-misc commit 48c787899882ec9c3e111a81801c82d10da17810 Author: Tomeu Vizoso <tomeu.vizoso(a)collabora.com&gt; AuthorDate: Fri Sep 9 11:56:48 2016 +0200 Commit: Daniel Vetter <daniel.vetter(a)ffwll.ch&gt; CommitDate: Wed Sep 28 17:05:01 2016 +0200 drm: Add API for capturing frame CRCs Adds files and directories to debugfs for controlling and reading frame CRCs, per CRTC: dri/0/crtc-0/crc dri/0/crtc-0/crc/control dri/0/crtc-0/crc/data Drivers can implement the set_crc_source callback() in drm_crtc_funcs to start and stop generating frame CRCs and can add entries to the output by calling drm_crtc_add_crc_entry. v2: - Lots of good fixes suggested by Thierry. - Added documentation. - Changed the debugfs layout. - Moved to allocate the entries circular queue once when frame generation gets enabled for the first time. v3: - Use the control file just to select the source, and start and stop capture when the data file is opened and closed, respectively. - Make variable the number of CRC values per entry, per source. - Allocate entries queue each time we start capturing as now there isn't a fixed number of CRC values per entry. - Store the frame counter in the data file as a 8-digit hex number. - For sources that cannot provide useful frame numbers, place XXXXXXXX in the frame field. v4: - Build only if CONFIG_DEBUG_FS is enabled. - Use memdup_user_nul. - Consolidate calculation of the size of an entry in a helper. - Add 0x prefix to hex numbers in the data file. - Remove unnecessary snprintf and strlen usage in read callback. v5: - Made the crcs array in drm_crtc_crc_entry fixed-size - Lots of other smaller improvements suggested by Emil Velikov v7: - Move definition of drm_debugfs_crtc_crc_add to drm_internal.h v8: - Call debugfs_remove_recursive when we fail to create the minor device Signed-off-by: Tomeu Vizoso <tomeu.vizoso(a)collabora.com&gt; Reviewed-by: Emil Velikov <emil.velikov(a)collabora.com&gt; Signed-off-by: Daniel Vetter <daniel.vetter(a)ffwll.ch&gt; +------------------------------------------------+------------+------------+------------+ | | 21165bd933 | 48c7878998 | 8eaf1ba239 | +------------------------------------------------+------------+------------+------------+ | boot_successes | 64 | 0 | 0 | | boot_failures | 2 | 24 | 31 | | IP-Config:Auto-configuration_of_network_failed | 2 | | | | BUG:unable_to_handle_kernel | 0 | 24 | 31 | | Oops:#[##] | 0 | 24 | 31 | | EIP_is_at_drm_debugfs_crtc_add | 0 | 24 | 31 | | calltrace:vgem_init | 0 | 24 | 31 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 24 | 31 | +------------------------------------------------+------------+------------+------------+ [ 4.576085] platform pc8736x_gpio.0: no device found [ 4.576933] nsc_gpio initializing [ 4.577648] [drm] Initialized [ 4.578262] BUG: unable to handle kernel paging request at fffffff8 [ 4.579313] IP: [<869c85a8>] drm_debugfs_crtc_add+0x8/0x80 [ 4.580213] *pde = 0f3e5067 *pte = 00000000 [ 4.580943] Oops: 0000 [#1] [ 4.581409] CPU: 0 PID: 1 Comm: swapper Not tainted 4.8.0-rc8-01313-g48c7878 #1 [ 4.582581] task: 8cc98d40 task.stack: 8cc9a000 [ 4.583317] EIP: 0060:[<869c85a8>] EFLAGS: 00210282 CPU: 0 [ 4.584199] EIP is at drm_debugfs_crtc_add+0x8/0x80 [ 4.584990] EAX: fffffff8 EBX: fffffff8 ECX: d71025bd EDX: 8ef32000 [ 4.586000] ESI: 8ed5f280 EDI: fffffff8 EBP: 8cc9bef0 ESP: 8cc9bee4 [ 4.587007] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 [ 4.587875] CR0: 80050033 CR2: fffffff8 CR3: 0f3e2000 CR4: 00000690 [ 4.588884] Stack: [ 4.589215] 8ef3248c 8ed5f280 fffffff8 8cc9bf0c 869b1329 872c2cc0 8ef32000 8ef32000 [ 4.590605] 00000000 00000000 8cc9bf20 869b1a59 00000000 87390383 00000277 8cc9bf2c [ 4.591984] 873903a6 00000000 8cc9bf88 87358b97 8d54f865 87358463 8cc9bf00 8645f9c9 [ 4.593364] Call Trace: [ 4.593770] [<869b1329>] drm_minor_register+0xa9/0x1d0 [ 4.594616] [<869b1a59>] drm_dev_register+0x79/0xc0 [ 4.595422] [<87390383>] ? ttm_init+0x5c/0x5c [ 4.596143] [<873903a6>] vgem_init+0x23/0x3a [ 4.596855] [<87358b97>] do_one_initcall+0x79/0x102 [ 4.597665] [<87358463>] ? do_early_param+0x73/0x73 [ 4.598470] [<8645f9c9>] ? parse_args+0x239/0x400 [ 4.599246] [<87358cdf>] ? kernel_init_freeable+0xbf/0x15c [ 4.600136] [<87358cff>] kernel_init_freeable+0xdf/0x15c [ 4.601008] [<86e23978>] kernel_init+0x8/0xe0 [ 4.601732] [<86e29f2e>] ret_from_kernel_thread+0xe/0x30 [ 4.602600] [<86e23970>] ? rest_init+0xb0/0xb0 [ 4.603330] Code: 89 e5 53 89 d3 e8 19 bf cf ff c7 83 b4 02 00 00 00 00 00 00 5b 5d f3 c3 8d 74 26 00 8d bc 27 00 00 00 00 55 89 e5 57 56 53 89 c3 <8b> 00 8b 78 20 ff b3 84 00 00 00 68 76 11 18 87 68 c0 00 40 02 [ 4.607457] EIP: [<869c85a8>] drm_debugfs_crtc_add+0x8/0x80 SS:ESP 0068:8cc9bee4 [ 4.608684] CR2: 00000000fffffff8 [ 4.609231] ---[ end trace 4e66c671f796ab4c ]--- [ 4.609971] Kernel panic - not syncing: Fatal exception git bisect start 8eaf1ba239ccb7c86e4658485303448475c60f32 08895a8b6b06ed2323cd97a36ee40a116b3db8ed -- git bisect bad fdb0b44991f3939c0f32b4527dc52fe4e778d003 # 01:13 0- 7 Merge 'ext3/for_next' into devel-spot-201609282342 git bisect bad cc299c15e9002868c07a0b243b39a97a0fae19f2 # 01:21 0- 5 Merge 'linux-review/Zhao-Qiang/irqchip-qeic-move-qeic-driver-from-drivers-soc-fsl-qe/20160928-203748' into devel-spot-201609282342 git bisect bad 31397e976113884063ef2fce1e064575558d54be # 01:29 0- 13 Merge 'hid/for-next' into devel-spot-201609282342 git bisect good 91a74e1ebad5aa136abe98fee201f8d00cdec6e3 # 01:37 21+ 2 Merge 'linux-review/Bartosz-Golaszewski/drm-tilcdc-add-a-workaround-for-failed-clk_set_rate/20160928-214806' into devel-spot-201609282342 git bisect bad c8c5fb567f3d9d08af78f9fa6e29796a9576fb8c # 01:49 0- 25 Merge 'drm-intel/drm-intel-nightly' into devel-spot-201609282342 git bisect good 8da08ca03b73593d5299893bf29fc08569c3fb5f # 02:34 22+ 2 ALSA: usb-line6: use the same declaration as definition in header for MIDI manufacturer ID git bisect good bc4ec7c83976fe03d2be75a8f64ea825f7b42867 # 02:47 22+ 0 drm/i915: don't report compression when fbc is disabled git bisect good fb261cf8872d1a9cd04ff18e56994394b59956fc # 02:57 22+ 0 Merge remote-tracking branch 'sound-upstream/for-linus' into drm-intel-nightly git bisect bad 75f15d81dec216ef768f334fe6b425d7a82a4435 # 03:05 0- 22 Merge remote-tracking branch 'origin/topic/drm-misc' into drm-intel-nightly git bisect good 849fccd258ec702381328c0a52442d268ff96082 # 03:12 22+ 0 Merge remote-tracking branch 'airlied/drm-next' into topic/drm-misc git bisect bad 48c787899882ec9c3e111a81801c82d10da17810 # 03:22 0- 22 drm: Add API for capturing frame CRCs git bisect good 21165bd933acd4b9d5bb81cc15cfa1fc1258ddc5 # 03:31 21+ 0 drm/i915/debugfs: Move out pipe CRC code # first bad commit: [48c787899882ec9c3e111a81801c82d10da17810] drm: Add API for capturing frame CRCs git bisect good 21165bd933acd4b9d5bb81cc15cfa1fc1258ddc5 # 03:34 62+ 0 drm/i915/debugfs: Move out pipe CRC code # extra tests with CONFIG_DEBUG_INFO_REDUCED git bisect bad 48c787899882ec9c3e111a81801c82d10da17810 # 03:41 0- 13 drm: Add API for capturing frame CRCs # extra tests on HEAD of linux-devel/devel-spot-201609282342 git bisect bad 8eaf1ba239ccb7c86e4658485303448475c60f32 # 03:42 0- 31 0day head guard for 'devel-spot-201609282342' # extra tests on tree/branch drm-intel/topic/drm-misc git bisect bad ea568478ad07e6dcf90fc02265760f703b50fb3d # 03:56 0- 31 drm/i915: Put "cooked" vlank counters in frame CRC lines # extra tests with first bad commit reverted git bisect good cec18f4c24bb4a8d72ad8a7dfa39811f8be6bc9d # 04:08 66+ 0 Revert "drm: Add API for capturing frame CRCs" # extra tests on tree/branch linus/master git bisect good ae6dd8d61913b5341067c7c660e8e91430d22e7c # 04:20 66+ 0 Merge tag 'for-linus-20160928' of git://git.infradead.org/linux-mtd # extra tests on tree/branch linux-next/master git bisect good d1dfecd6e1caba6b4d77be1036a8a5db9d6c3453 # 04:24 60+ 0 Add linux-next specific files for 20160928 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/lkp Intel Corporation