Greetings, I got the below dmesg and the first bad commit is commit 6aa69f99b2ecc7f9b387fcf22d30e6601b58819f Author: Kamil Debski Date: Fri Jan 25 06:29:57 2013 -0300 [media] vb2: Add support for non monotonic timestamps Not all drivers use monotonic timestamps. This patch adds a way to set the timestamp type per every queue. In addition, set proper timestamp type in drivers that I am sure that use either MONOTONIC or COPY timestamps. Other drivers will correctly report UNKNOWN timestamp type instead of assuming that all drivers use monotonic timestamps. Signed-off-by: Kamil Debski Signed-off-by: Kyungmin Park Reviewed-by: Sylwester Nawrocki Acked-by: Hans Verkuil Signed-off-by: Sylwester Nawrocki Signed-off-by: Mauro Carvalho Chehab [ 21.139201] Colour QuickCam for Video4Linux v0.06 [ 21.662974] ------------[ cut here ]------------ [ 21.664255] WARNING: at /c/kernel-tests/src/linux/drivers/media/v4l2-core/videobuf2-core.c:2065 vb2_queue_init+0xe5/0x1c0() [ 21.667066] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.10.0-rc3-00088-g459e3a1 #11 [ 21.668980] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007 git bisect start 459e3a152aa809827367f5486e179cbabebb6877 v3.9 -- git bisect bad 73287a43cc79ca06629a88d1a199cd283f42456a # 0 2013-05-29 16:45:09 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next git bisect good 5d434fcb255dec99189f1c58a06e4f56e12bf77d # 10 2013-05-29 16:49:30 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial git bisect good 91bc033c4d01656e3d8e45a13fd58924a3099693 # 10 2013-05-29 16:53:47 bridge: avoid OOPS if root port not found git bisect bad 165bc513f7ec54d3fa3660f5c851c4bbc533d577 # 0 2013-05-29 16:57:05 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k git bisect bad b12f7dd51abf419b9279f3ff2fdc3c06fe50c10f # 0 2013-05-29 16:59:52 [media] tw9906: Remove unneeded version.h header include git bisect bad 05f0ffbc487517a529c00119d0bfde33df509b52 # 0 2013-05-29 17:02:32 [media] siano: use USB endpoint descriptors for in/out endp git bisect good 2aeb73e19dc3d17beebc1b9a678f4c60e1072e25 # 10 2013-05-29 17:14:08 [media] stk-webcam: add ASUS F3JC to upside-down list git bisect bad f1065c964869aecd5af04291476c358fd5ab9a8f # 0 2013-05-29 17:19:27 [media] media: tuners: Remove redundant NULL check before kfree git bisect bad 39696009d0d4472606b7fb90fc635a0d0fecba60 # 0 2013-05-29 17:23:10 [media] s2255: add device_caps support to querycap git bisect bad 69b95a3a80b44ebb71bf153e79bcb8580e1d3de5 # 0 2013-05-29 17:26:27 [media] s3c-camif: Fail on insufficient number of allocated buffers git bisect good 8407653f5e2b9805958e0a392c0411ce027a3934 # 10 2013-05-29 17:44:16 [media] stk-webcam: zero the priv field of v4l2_pix_format git bisect good f81e372a5d11694b86fc35ded379a441c209b920 # 10 2013-05-29 18:02:13 [media] stk-webcam: s_fmt shouldn't grab ownership git bisect good 53bf0f446bc387eabdd535dca080789cc74607f4 # 10 2013-05-29 18:19:30 [media] v4l: Define video buffer flag for the COPY timestamp type git bisect bad 6aa69f99b2ecc7f9b387fcf22d30e6601b58819f # 0 2013-05-29 18:27:33 [media] vb2: Add support for non monotonic timestamps git bisect good 53bf0f446bc387eabdd535dca080789cc74607f4 # 30 2013-05-29 18:39:26 [media] v4l: Define video buffer flag for the COPY timestamp type git bisect bad 459e3a152aa809827367f5486e179cbabebb6877 # 0 2013-05-29 18:40:46 Merge remote-tracking branch 'tip/x86/urgent' into devel-snb-i386-2013-05-29-07-09 git bisect bad 1ca94a12e6c269b0dfc10424c27ff295b3420e9c # 0 2013-05-29 18:53:54 Add linux-next specific files for 20130529 Thanks, Fengguang