On Monday 01 November 2010 15:38:38 Alexander Best wrote: > 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. >
Maybe you could manually run: bt all And look for "cam" and "usb" keywords. And write down the backtraces. --HPS _______________________________________________ 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"
