That is most likely the em28xx locking bug. It'll happen when you plug a second em28xx device in, or plug one in for a second time. The steps you've shown include that process. Try doing `rmmod em28xx-dvb` before re-plugging the device. If that 'cures' it, you're a victim of the same problem. I'm not overtly familiar with the interactions of em28xx with the rest of the kernel & userland and why the bug manifests, but it is on my list of things to (try to) fix, although I'm hoping somebody more able than me figures it out first :) Regards, -- Steve Kerrison MEng Hons. http://www.stevekerrison.com/ On Sun, 2011-08-14 at 17:05 -0700, Chris Rankin wrote: > >> INFO: task khubd:1100 blocked for more than 120 seconds. > >> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > >> khubd D 0000000000000000 0 1100 2 0x00000000 > >> ffff8801a694e930 0000000000000046 ffff8801a691ffd8 ffffffff8162b020 > >> 0000000000010280 ffff8801a691ffd8 0000000000004000 0000000000010280 > >> ffff8801a691ffd8 ffff8801a694e930 0000000000010280 ffff8801a691e000 > >> Call Trace: > >> [<ffffffff8128580e>] ? apic_timer_interrupt+0xe/0x20 > >> [<ffffffff8113ffff>] ? memscan+0x3/0x18 > >> [<ffffffff8128354e>] ? __mutex_lock_slowpath+0x15c/0x295 > >> [<ffffffff81283690>] ? mutex_lock+0x9/0x18 > >> [<ffffffffa06af671>] ? dvb_init+0x99/0xcc8 [em28xx_dvb] > >> [<ffffffffa067d459>] ? em28xx_init_extension+0x35/0x53 [em28xx] > >> [<ffffffffa067b938>] ? em28xx_usb_probe+0x827/0x8df [em28xx] > > > > I think it crashes before it even goes to PCTV 290e specific part. I > > suspect it is bug somewhere in em28xx driver. > > The scenario that triggers this crash is: > a) Plug the 290e in, and allow it to initialise correctly > b) Use xine to watch any DVB-T channel successfully > c) Try switching to previously-tuned DVB-T2 channel; this makes xine hang. > d) Kill xine > e) Physically replug adapter > > em28xx re-initialisation will now fail: > > ... > tda18271: performing RF tracking filter calibration > tda18271: RF tracking filter calibration complete > usb 4-1: USB disconnect, device number 3 > em28xx #0: disconnecting em28xx #0 video > em28xx #0: V4L2 device video1 deregistered > tda18271 7-0060: destroying instance > usb 4-1: new high speed USB device number 4 using ehci_hcd > em28xx: New device PCTV Systems PCTV 290e @ 480 Mbps (2013:024f, interface 0, class 0) > em28xx #0: chip ID is em28174 > em28xx #0: Identified as PCTV nanoStick T2 290e (card=78) > Registered IR keymap rc-pinnacle-pctv-hd > input: em28xx IR (em28xx #0) as /devices/pci0000:00/0000:00:1d.7/usb4/4-1/rc/rc1/input8 > rc1: em28xx IR (em28xx #0) as /devices/pci0000:00/0000:00:1d.7/usb4/4-1/rc/rc1 > em28xx #0: v4l2 driver version 0.1.2 > em28xx #0: V4L2 video device registered as video1 > INFO: task khubd:1217 blocked for more than 120 seconds. > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > khubd D 0000000000000000 0 1217 2 0x00000000 > ffff8801a7081ef0 0000000000000046 ffff8801a69a9fd8 ffffffff8162b020 > 0000000000010280 ffff8801a69a9fd8 0000000000004000 0000000000010280 > ffff8801a69a9fd8 ffff8801a7081ef0 0000000000010280 ffff8801a69a8000 > Call Trace: > [<ffffffff8128580e>] ? apic_timer_interrupt+0xe/0x20 > [<ffffffff8113ffff>] ? memscan+0x3/0x18 > [<ffffffff8128354e>] ? __mutex_lock_slowpath+0x15c/0x295 > [<ffffffff81283690>] ? mutex_lock+0x9/0x18 > [<ffffffffa0694671>] ? dvb_init+0x99/0xcc8 [em28xx_dvb] > [<ffffffffa0662459>] ? em28xx_init_extension+0x35/0x53 [em28xx] > [<ffffffffa0660938>] ? em28xx_usb_probe+0x827/0x8df [em28xx] > > Cheers, > Chris > > -- > 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 -- 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
