rmmod -f pwc

don't ever do that ! when reconnecting the usb webcam, I got:

Message from syslogd@dhcp-67-183 at Sep  3 17:25:05 ...
 kernel:[32033.949742] general protection fault: 0000 [#1] SMP

Message from syslogd@dhcp-67-183 at Sep  3 17:25:05 ...
 kernel:[32033.949746] last sysfs file: /sys/devices/pci0000:00/0000:00:1a.1/usb2/2-2/2-2:1.0/video4linux/video1/uevent

Message from syslogd@dhcp-67-183 at Sep  3 17:25:05 ...
 kernel:[32033.949850] Stack:

Message from syslogd@dhcp-67-183 at Sep  3 17:25:05 ...
 kernel:[32033.949860] Call Trace:

Message from syslogd@dhcp-67-183 at Sep  3 17:25:05 ...
 kernel:[32033.949888] Code: eb 39 48 8d 6b 08 48 89 ef e8 34 af 29 e0 48 c7 c7 20 62 f8 a0 e8 47 7d 37 e0 48 8b 03 31 db 48 8b 40 40 48 85 c0 74 13 4c 89 e7 <ff> d0 85 c0 89 c3 74 08 48 89 ef e8 6e ae 29 e0 89 d8 5b 5d 41