unregister_netdevice: waiting for tap24 to become free

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Hi. I am hitting a bug that manifests in an unregister_netdevice error message. After the problem is triggered processes like ifconfig, tunctl and route refuse to exit, even with killed. And the only solution I have found to regaining control of the server is issuing a reboot.

The server is running a number of tap devices. (It is a UML host server running the skas patches http://www.user-mode-linux.org/~blaisorblade/).

Regards, Peter

# uname -r
2.6.11.7-skas3-v8

unregister_netdevice: waiting for tap24 to become free. Usage count = 1
unregister_netdevice: waiting for tap24 to become free. Usage count = 1
unregister_netdevice: waiting for tap24 to become free. Usage count = 1
unregister_netdevice: waiting for tap24 to become free. Usage count = 1
unregister_netdevice: waiting for tap24 to become free. Usage count = 1
unregister_netdevice: waiting for tap24 to become free. Usage count = 1
unregister_netdevice: waiting for tap24 to become free. Usage count = 1


30684 ?        DW     0:45          \_ [tunctl]
31974 ?        S      0:00 /bin/bash ./monitorbw.sh
31976 ?        S      0:00  \_ /bin/bash ./monitorbw.sh
31978 ?        D      0:00      \_ /sbin/ifconfig
31979 ?        S      0:00      \_ grep \(tap\)\|\(RX bytes\)
32052 ? S 0:00 /bin/bash /opt/uml/umlcontrol.sh start --user gildersleeve.de 32112 ? S 0:00 \_ /bin/bash /opt/uml/umlrun.sh --user gildersleeve.de 32152 ? S 0:00 \_ /bin/bash ./umlnetworksetup.sh --check --user gildersleeve.de
32176 ?        D      0:00          \_ tunctl -u gildersleeve.de -t tap24
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