The following reply was made to PR usb/77184; it has been noted by GNATS. From: Yuri <y...@rawbw.com> To: Cc: bug-follo...@freebsd.org Subject: Re: usb/77184: [umass] [panic] kernel panic on USB device disconnect, even if not detected Date: Wed, 14 Jul 2010 13:15:22 -0700
Crash is gone. But there is something wrong. I did the following steps: 1. plug the camera into USB and mount it 2. unplug the camera without unmounting it -- no crash, looks good. 3. mount still exists. that's ok. 4. umount /mnt/camera -- command says: "Device Busy", this looks reasonable. 5. umount -f /mnt/camera -- mount is gone. 6. repeated steps 1...4 on step 4 umount command without -f flag doesn't complain about device busy any more. This is really strange and this means that device disconnect or unmount hasn't been done cleanly and something is different now. So this issue has to be cleared -- outcome of steps 1..5 should always be the same. Now after rereading the original post I realize that I am testing the different condition but for quite similar situation. F828 camera isn't available any more and is probably supported by now, so it's really difficult to retest the original condition now. But my previous post indicates there is the problem in USB stack in the similar scenario, thiugh without unsupported device. Before I saw panic in the case of disconnect of the mounted disk. Yuri _______________________________________________ firstname.lastname@example.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-usb To unsubscribe, send any mail to "freebsd-usb-unsubscr...@freebsd.org"