Created attachment 603933 [details] /var/log/messages Happened after something like that (qmmp - audio player): killall -STOP qmmp sleep 2h killall -STOP qmmp sleep 10m killall -CONT qmmp Don't mind a lot of debug prints in kernel messages. u->ep / u->ep->chip / u->urb pointers might be null in release_urb_ctx() inlined in release_urbs() Audio card HW: Ibasso D7 (Sidewinder), lsusb output attached. Kernel 3.5.1-1.fc17.x86_64
Created attachment 603934 [details] lsusb output for USB audio card
Created attachment 611269 [details] dmesg output Happened again after video playback resume in mplayer. System almost recovered by itself after several seconds. Sound became broken and it wasn't possible to remove snd_usb_audio module even after device unplug: # modprobe -r snd_usb_audio FATAL: Module snd_usb_audio is in use. # lsmod | grep usb snd_usb_audio 130222 2 snd_usbmidi_lib 24728 1 snd_usb_audio snd_hwdep 17650 1 snd_usb_audio snd_rawmidi 29531 1 snd_usbmidi_lib snd_pcm 97292 6 snd_usb_audio,snd_ac97_codec,snd_intel8x0 snd 79242 18 snd_usb_audio,snd_ac97_codec,snd_intel8x0,snd_hwdep,snd_timer,snd_pcm,snd_rawmidi,snd_usbmidi_lib,snd_seq_device Kernel 3.5.3-1.fc17.x86_64
Are you still seeing this with 3.6.11 or newer?
I'm on 3.6.10-4 (current version for f18) and for all the time I was using USB audio this bug have happened just a several times. I'll update current issue if it happen at 3.6.11+
This bug is being closed because it has been set needinfo for more than 2 weeks without a response. If this is still an issue, please reopen and reply with the requested information.