kern/116837: ifconfig tunX destroy: panic

Jonathan Pascal jkpyvxmzsa at
Tue Oct 2 10:30:07 PDT 2007

>Number:         116837
>Category:       kern
>Synopsis:       ifconfig tunX destroy: panic
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Oct 02 17:30:06 GMT 2007
>Originator:     Jonathan Pascal
>Release:        -CURRENT as of 2007-09-29
FreeBSD box 7.0-CURRENT FreeBSD 7.0-CURRENT #4: Sat Sep 29 19:41:37 CEST 2007     root at box:/usr/obj/usr/src/sys/CURRENT_STARLIGHT  i386
Destroying a tun device while a process is using it via /dev/tunX leads to a kernel panic.
# cat < /dev/tun0 > /dev/tun0 &
# ifconfig tun0 destroy

panic: tununits is out of sync - unit 0


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