Hello everyone,we came across a regression in the V4L2 part of the sur40 driver. I've been out of the loop with V4L2 development for some time, so I'd appreciate any bit of input for debugging this.
When trying to read from the associated video device, the following stacktrace gets dumped by the kernel:
[55921.426292] CPU: 1 PID: 304262 Comm: guvcview Tainted: G E 5.13.0-rc2+ #1 [55921.426296] Hardware name: Samsung SUR40/SDNE-R78BA2-20, BIOS SDNE-R78BA2-2000 02/23/2012
[55921.426297] RIP: 0010:dma_map_sg_attrs+0x37/0x50[55921.426301] Code: 85 c0 48 0f 44 05 b9 e3 d9 01 83 f9 02 77 19 48 83 bf 40 02 00 00 00 74 11 48 85 c0 75 11 e8 50 18 00 00 85 c0 78 13 c3 0f 0b <0f> 0b 31 c0 c3 48 8b 40 50 e8 ab f6 ae 00 eb e9 0f 0b 0f 1f 80 00
[55921.426303] RSP: 0018:ffffad8a81a4bc38 EFLAGS: 00010246 [55921.426306] RAX: ffffffff8ee0a140 RBX: 0000000000002dc0 RCX: 0000000000000002 [55921.426307] RDX: 0000000000000007 RSI: ffff88fd05ce8100 RDI: ffff88fe0c026830 [55921.426309] RBP: 000000000000007f R08: 0000000000000020 R09: 0000000000000000 [55921.426310] R10: 0000000000000000 R11: ffffd73b80000000 R12: ffff88fe04748880 [55921.426311] R13: 000000000007f000 R14: 0000000000000000 R15: 0000000000000000[55921.426313] FS: 00007fc2fb796440(0000) GS:ffff88fe33d00000(0000) knlGS:0000000000000000
[55921.426315] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [55921.426316] CR2: 00007fc2fa9d6000 CR3: 000000000cfee000 CR4: 00000000000006e0 [55921.426318] Call Trace: [55921.426322] vb2_dma_sg_alloc+0x1a2/0x2a0 [videobuf2_dma_sg] [55921.426329] __vb2_queue_alloc+0x177/0x3c0 [videobuf2_common] [55921.426337] vb2_core_reqbufs+0x237/0x3b0 [videobuf2_common] [55921.426344] vb2_ioctl_reqbufs+0x77/0xb0 [videobuf2_v4l2] [55921.426351] __video_do_ioctl+0x39e/0x3d0 [videodev] [55921.426379] video_usercopy+0x177/0x750 [videodev] [55921.426393] ? v4l_print_control+0x20/0x20 [videodev] [55921.426408] v4l2_ioctl+0x48/0x50 [videodev] [55921.426422] __x64_sys_ioctl+0x83/0xb0 [55921.426426] do_syscall_64+0x40/0xb0 [55921.426429] entry_SYSCALL_64_after_hwframe+0x44/0xae [55921.426432] RIP: 0033:0x7fc3050a29b9[55921.426435] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a7 54 0c 00 f7 d8 64 89 01 48 [55921.426437] RSP: 002b:00007ffcb50d6a28 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[55921.426439] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fc3050a29b9 [55921.426440] RDX: 0000563371288e90 RSI: 00000000c0145608 RDI: 0000000000000004 [55921.426442] RBP: 00000000c0145608 R08: 0000000000000000 R09: 0000000000000000 [55921.426443] R10: 00007fc304fa5020 R11: 0000000000000246 R12: 0000000000000004 [55921.426444] R13: 0000000000000000 R14: 00007fc304fa5020 R15: 0000563371288e90 [55921.426447] ---[ end trace fd6bcb1bcbdb4e65 ]---In addition, v4l2-compliance reports some failures regarding buffer ioctls (see attachment).
I can't pinpoint any recent commits to the driver itself that might have caused this, so I assume it's related to a change in the framework itself.
Any suggestions very much appreciated! Best, Florian -- SENT FROM MY DEC VT50 TERMINAL
v4l2-compliance SHA: not available , 64 bits, 64-bit time_t Compliance test for sur40 device /dev/video0: Driver Info: Driver name : sur40 Card type : Samsung SUR40 Bus info : usb-0000:00:13.2-1 Driver version : 5.13.0 Capabilities : 0x95200001 Video Capture Touch Device Read/Write Streaming Extended Pix Format Device Capabilities Device Caps : 0x15200001 Video Capture Touch Device Read/Write Streaming Extended Pix Format Required ioctls: test VIDIOC_QUERYCAP: OK Allow for multiple opens: test second /dev/video0 open: OK test VIDIOC_QUERYCAP: OK test VIDIOC_G/S_PRIORITY: OK test for unlimited opens: OK test invalid ioctls: OK Debug ioctls: test VIDIOC_DBG_G/S_REGISTER: OK (Not Supported) test VIDIOC_LOG_STATUS: OK (Not Supported) Input ioctls: test VIDIOC_G/S_TUNER/ENUM_FREQ_BANDS: OK (Not Supported) test VIDIOC_G/S_FREQUENCY: OK (Not Supported) test VIDIOC_S_HW_FREQ_SEEK: OK (Not Supported) test VIDIOC_ENUMAUDIO: OK (Not Supported) test VIDIOC_G/S/ENUMINPUT: OK test VIDIOC_G/S_AUDIO: OK (Not Supported) Inputs: 1 Audio Inputs: 0 Tuners: 0 Output ioctls: test VIDIOC_G/S_MODULATOR: OK (Not Supported) test VIDIOC_G/S_FREQUENCY: OK (Not Supported) test VIDIOC_ENUMAUDOUT: OK (Not Supported) test VIDIOC_G/S/ENUMOUTPUT: OK (Not Supported) test VIDIOC_G/S_AUDOUT: OK (Not Supported) Outputs: 0 Audio Outputs: 0 Modulators: 0 Input/Output configuration ioctls: test VIDIOC_ENUM/G/S/QUERY_STD: OK (Not Supported) test VIDIOC_ENUM/G/S/QUERY_DV_TIMINGS: OK (Not Supported) test VIDIOC_DV_TIMINGS_CAP: OK (Not Supported) test VIDIOC_G/S_EDID: OK (Not Supported) Control ioctls (Input 0): test VIDIOC_QUERY_EXT_CTRL/QUERYMENU: OK test VIDIOC_QUERYCTRL: OK test VIDIOC_G/S_CTRL: OK test VIDIOC_G/S/TRY_EXT_CTRLS: OK fail: v4l2-test-controls.cpp(835): subscribe event for control 'User Controls' failed test VIDIOC_(UN)SUBSCRIBE_EVENT/DQEVENT: FAIL test VIDIOC_G/S_JPEGCOMP: OK (Not Supported) Standard Controls: 5 Private Controls: 0 Format ioctls (Input 0): test VIDIOC_ENUM_FMT/FRAMESIZES/FRAMEINTERVALS: OK test VIDIOC_G/S_PARM: OK test VIDIOC_G_FBUF: OK (Not Supported) test VIDIOC_G_FMT: OK test VIDIOC_TRY_FMT: OK test VIDIOC_S_FMT: OK test VIDIOC_G_SLICED_VBI_CAP: OK (Not Supported) test Cropping: OK (Not Supported) test Composing: OK (Not Supported) test Scaling: OK (Not Supported) Codec ioctls (Input 0): test VIDIOC_(TRY_)ENCODER_CMD: OK (Not Supported) test VIDIOC_G_ENC_INDEX: OK (Not Supported) test VIDIOC_(TRY_)DECODER_CMD: OK (Not Supported) Buffer ioctls (Input 0): fail: v4l2-test-buffers.cpp(612): q.reqbufs(node, 1) test VIDIOC_REQBUFS/CREATE_BUFS/QUERYBUF: FAIL fail: v4l2-test-buffers.cpp(749): VIDIOC_EXPBUF is supported, but the V4L2_MEMORY_MMAP support is missing or malfunctioning. fail: v4l2-test-buffers.cpp(750): VIDIOC_EXPBUF is supported, but the V4L2_MEMORY_MMAP support is missing, probably due to earlier failing format tests. test VIDIOC_EXPBUF: OK (Not Supported) test Requests: OK (Not Supported) Total for sur40 device /dev/video0: 45, Succeeded: 43, Failed: 2, Warnings: 0
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