I am getting a kernel NULL pointer reference in a dvb_core module. I am using v4l-dbv code cloned from http://linuxtv.org/hg/v4l-dvb using mercurial today. /sys/module/dvb_usb/srcversion contains 09654C413A19358611A87AD The v4l-dvb code compiled without any errors. My setup is: Architecture: x86_64 (running on an AMD 64 X2 5200+ with 5GB ram) Kernel: 2.6.33.6-147.fc13.x86_64 Release: Fedora release 13 (Goddard) My device is: idVendor 0x0413 Leadtek Research, Inc. idProduct 0x6f00 WinFast DTV Dongle (STK7700P based) The firmware file is that supplied with the Fedora distribution dvb-usb-dib0700-1.20.fw This matches the version on: http://www.wi-bw.tfh-wildau.de/~pboettch/home/files/dvb-usb-dib0700-1.20.fw The output from scandvb when this happens is: scanning /usr/share/dvb-apps/dvb-t/uk-xxx using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0' initial transponder 650200000 0 2 9 3 1 0 0 initial transponder 674200000 0 2 9 3 1 0 0 initial transponder 641800000 0 2 9 3 1 0 0 initial transponder 665800000 0 2 9 3 1 0 0 initial transponder 697800000 0 2 9 3 1 0 0 >>> tune to: 650200000:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_2_3:FEC_AUTO:QAM_64:TRANSMISSION_MODE_8K:GUARD_INTERVAL_1_32:HIERARCHY_NONE Message from syslogd@Am2 at Aug 3 01:01:10 ... kernel:Oops: 0000 [#1] SMP Message from syslogd@Am2 at Aug 3 01:01:10 ... kernel:last sysfs file: /sys/module/dvb_usb/initstate Message from syslogd@Am2 at Aug 3 01:01:10 ... kernel:Stack: Message from syslogd@Am2 at Aug 3 01:01:10 ... kernel:Call Trace: Message from syslogd@Am2 at Aug 3 01:01:10 ... kernel:Code: 89 55 f8 48 c7 c2 4b 01 00 a0 e8 af 9b 2a e1 c9 c3 55 48 89 e5 41 57 41 89 d7 41 56 49 89 f6 41 55 41 54 53 48 89 fb 48 83 ec 18 <48> 8b 47 10 48 83 38 00 0f 84 8f 00 00 00 65 48 8b 04 25 08 cc Message from syslogd@Am2 at Aug 3 01:01:10 ... kernel:CR2: 0000000000000012 Here is the back trace: BUG: unable to handle kernel NULL pointer dereference at 0000000000000012 IP: [<ffffffffa00004fd>] i2c_transfer+0x1a/0x109 [i2c_core] PGD 1486e2067 PUD 148714067 PMD 0 Oops: 0000 [#1] SMP last sysfs file: /sys/module/dvb_usb/initstate CPU 1 Pid: 2559, comm: scandvb Not tainted 2.6.33.6-147.fc13.x86_64 #1 PE-AM2RS690MH/Unknow RIP: 0010:[<ffffffffa00004fd>] [<ffffffffa00004fd>] i2c_transfer +0x1a/0x109 [i2c_core] RSP: 0018:ffff880148763b48 EFLAGS: 00010296 RAX: ffff880148763bb8 RBX: 0000000000000002 RCX: 0000000000000000 RDX: 0000000000000002 RSI: ffff880148763b98 RDI: 0000000000000002 RBP: ffff880148763b88 R08: ffff88002b881d60 R09: 0000000050000d80 R10: 0000000000000005 R11: 0000000000004a38 R12: 0000000000000000 R13: 0000000000000001 R14: ffff880148763b98 R15: 0000000000000002 FS: 00007f6a4e2e5700(0000) GS:ffff880006900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 0000000000000012 CR3: 0000000148614000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process scandvb (pid: 2559, threadinfo ffff880148762000, task ffff88014dc40000) Stack: ffff88014ecd1100 ffffc90000003000 ffff880148763b78 00000000000000eb 0000000000000000 0000000000000001 0000000000000001 0000000000000000 ffff880148763be8 ffffffffa023110d 0000000200000010 ffff880148763bc8 Call Trace: [<ffffffffa023110d>] dib7000p_read_word+0x68/0xb7 [dib7000p] [<ffffffff81305f99>] ? usb_submit_urb+0x26a/0x2e7 [<ffffffffa0231d7c>] dib7000p_pid_filter_ctrl+0x28/0x8a [dib7000p] [<ffffffffa02867c9>] stk70x0p_pid_filter_ctrl+0x14/0x17 [dvb_usb_dib0700] [<ffffffffa019e447>] dvb_usb_ctrl_feed+0x172/0x1d2 [dvb_usb] [<ffffffffa019e522>] dvb_usb_start_feed+0x3d/0x43 [dvb_usb] [<ffffffffa01461cd>] dmx_section_feed_start_filtering+0xfc/0x150 [dvb_core] [<ffffffffa0144b11>] dvb_dmxdev_filter_start+0x236/0x310 [dvb_core] [<ffffffffa01452bf>] dvb_demux_do_ioctl+0x1bf/0x48c [dvb_core] [<ffffffffa0145100>] ? dvb_demux_do_ioctl+0x0/0x48c [dvb_core] [<ffffffffa0143425>] dvb_usercopy+0xd2/0x160 [dvb_core] [<ffffffffa0144049>] dvb_demux_ioctl+0x10/0x12 [dvb_core] [<ffffffff8110d917>] vfs_ioctl+0x75/0xa1 [<ffffffff8110de38>] do_vfs_ioctl+0x47e/0x4c4 [<ffffffff810f3328>] ? virt_to_head_page+0x9/0x2a [<ffffffff8110decf>] sys_ioctl+0x51/0x74 [<ffffffff81009b02>] system_call_fastpath+0x16/0x1b Code: 89 55 f8 48 c7 c2 4b 01 00 a0 e8 af 9b 2a e1 c9 c3 55 48 89 e5 41 57 41 89 d7 41 56 49 89 f6 41 55 41 54 53 48 89 fb 48 83 ec 18 <48> 8b 47 10 48 83 38 00 0f 84 8f 00 00 00 65 48 8b 04 25 08 cc RIP [<ffffffffa00004fd>] i2c_transfer+0x1a/0x109 [i2c_core] RSP <ffff880148763b48> CR2: 0000000000000012 This is the output from lsusb -v -s 1:2: Bus 001 Device 002: ID 0413:6f00 Leadtek Research, Inc. WinFast DTV Dongle (STK7700P based) Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 2.00 bDeviceClass 0 (Defined at Interface level) bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 64 idVendor 0x0413 Leadtek Research, Inc. idProduct 0x6f00 WinFast DTV Dongle (STK7700P based) bcdDevice 1.00 iManufacturer 1 DIBCOM iProduct 2 STK7700 iSerial 3 0000000001 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 46 bNumInterfaces 1 bConfigurationValue 1 iConfiguration 0 bmAttributes 0xa0 (Bus Powered) Remote Wakeup MaxPower 500mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 4 bInterfaceClass 255 Vendor Specific Class bInterfaceSubClass 0 bInterfaceProtocol 0 iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x01 EP 1 OUT bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 1 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 3 Transfer Type Interrupt Synch Type None Usage Type Data wMaxPacketSize 0x0040 1x 64 bytes bInterval 10 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x82 EP 2 IN bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 1 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x83 EP 3 IN bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 1 Device Qualifier (for other device speed): bLength 10 bDescriptorType 6 bcdUSB 2.00 bDeviceClass 0 (Defined at Interface level) bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 64 bNumConfigurations 1 Device Status: 0x0000 (Bus Powered) These are the relevant lines from dmesg: dvb-usb: Leadtek Winfast DTV Dongle (STK7700P based) successfully initialized and connected. dib0700: rc submit urb failed I am not a kernel module programmer. If there are other logs or traces I should submit please advise. Graham C -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
