Package: ifupdown
Version: 0.7.7
Severity: critical
Justification: breaks the whole system

Dear Maintainer,

after upgrade ifupdonw to 0.7.7 on debian testing ifdown has Segmentation fault
while bring down vlan interfaces, how to reprodice:

iface eth0.2 inet static
       address 192.168.1.1
       netmask 255.255.255.0
       broadcast 192.168.1.255

ifup eth0.2, then ifdown eth0.2

root@prototype:~# ifup eth0.2
root@prototype:~# ifdown eth0.2
Segmentation fault

dmesg:
[1083455.154702] ifdown[29972]: segfault at 0 ip b76af720 sp bfec5be0 error 4
in libc-2.13.so[b7637000+147000]

tested on several systems with same results.

also, if vlan package installed, ifup try add vlan interface twice, firs
through ip, second through pre-up script which give error about already existet
interface:

root@prototype:~# ifup eth0.2
Set name-type for VLAN subsystem. Should be visible in /proc/net/vlan/config
ERROR: trying to add VLAN #2 to IF -:eth0:-  error: File exists



-- System Information:
Debian Release: 7.0
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: i386 (i686)

Kernel: Linux 3.2.41-rt60-r266 (PREEMPT)
Locale: LANG=ru_RU.KOI8-R, LC_CTYPE=ru_RU.KOI8-R (charmap=KOI8-R)
Shell: /bin/sh linked to /bin/dash

Versions of packages ifupdown depends on:
ii  dpkg         1.16.10
ii  initscripts  2.88dsf-41
ii  iproute      20121211-2
ii  libc6        2.13-38
ii  lsb-base     4.1+Debian8

ifupdown recommends no packages.

Versions of packages ifupdown suggests:
pn  isc-dhcp-client | dhcp-client  <none>
ii  net-tools                      1.60-24.2
ii  ppp                            2.4.5-5.1+b1
pn  rdnssd                         <none>

-- debconf-show failed


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