On Mon Oct 25 10, Alexander Motin wrote: > Hans Petter Selasky wrote: > > On Wednesday 20 October 2010 17:30:40 Alexander Best wrote: > >> hi there, > >> > >> i'm running HEAD (r213495; amd64). i stumbled upon this severe problem: > >> > >> after attaching my mobile phone, it simply resets without doing mount or > >> anything. however after letting the device come up again it won't show up > >> in the console. after detaching it the usb subsystem seemed to have > >> completely crashed. but that's not all. the following programs now simply > >> hang without producing any output C-C won't do anything: > >> > >> - dmesg > >> - top > >> - ps > >> - killall > >> - camcontrol devlist > >> - usbconfig > > > > That's most likely because USB's umass driver is waiting for cam to drain. > > Possibly some refcounting is not correct. I suspect this is not a USB > > problem. > > Try to enter into the debugger, and look for backtrace for function stuck > > in > > umass_detach.
i set debug.kdb.panic=1, but didn't work, because writing the core dump stalled and watchdog came up. any advice? cheers. alex > > It is a bit suspicious that problem happens only when device dies during > request. Are you sure that running command was properly aborted when > device got detached? Every running command has own set of references, > denying detach. > > -- > Alexander Motin -- a13x _______________________________________________ freebsd-usb@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-usb To unsubscribe, send any mail to "freebsd-usb-unsubscr...@freebsd.org"
