TINC (vpn daemon) has stopped working after compiling kernel

[Martin Rusko]

Hi folks,
after recompiling of kernel (need quota support), tinc daemon has
stopped working. Messages from log file are:
...
Nov 21 14:45:02 m61 tinc.sunnet[326]: tincd 1.0pre7 starting
Nov 21 14:45:02 m61 tinc.sunnet[326]: /dev/net/tun is a Linux ethertap 
device
Nov 21 14:45:02 m61 tinc.sunnet[326]: Process 327 (tinc-up) exited with 
non-zero status 255
Nov 21 14:45:02 m61 tinc.sunnet[326]: Ready
Nov 21 14:45:02 m61 tinc.sunnet[326]: Error while reading from Linux 
ethertap device /dev/net/tun: File descriptor in bad state
Nov 21 14:45:07 m61 last message repeated 13683 times
...

Tinc fails while reading device file /dev/net/tun, but this file seems
to be correct (major, minor numbers, permissions):

rusko at m61:~$ ls -l /dev/net/tun
crw-r--r--    1 root     root      10, 200 Nov  6 22:09 /dev/net/tun

I also show here log file records, when tinc is operating normal:
...
Nov 18 12:55:32 m61 tinc.sunnet[239]: tincd 1.0pre7 starting
Nov 18 12:55:32 m61 tinc.sunnet[239]: /dev/net/tun is a Linux tun/tap device
Nov 18 12:55:32 m61 tinc.sunnet[239]: Ready
...
My whole journey was:
~~~~~~~~~~~~~~~~~~~~~
Step 1.) distribution kernel (2.4.18 from woody) + tinc/stable 1.0pre7-2
=> WORKING

Step 2.) custom compiled kernel (2.4.18 from woody's sources) +
tinc/stable 1.0pre7-2 => NOT WORKING

After some discussion on tinc mailing list I tried recompiling tinc
against running custom kernel, with correct kernel headers 
(--with-kernel=/usr/src/linux and ./configure script has found a correct 
header file), but:

Step 3.) custom compiled kernel (2.4.18 from woody's sources) +
tinc/custom_compiled 1.0pre7-2 => NOT WORKING

Step 4.) distribution kernel (2.4.18 from woody) + tinc/custom_compiled
1.0pre7-2 => WORKING

It seems to be, that I did something wrong, when compiling kernel. But
I'm unable to find what. ;-( Also tun.o module from custom kernel has 
different size, than the one from Woody (but they have the same source). 
So maybe different compiler, some optimization...I really don't know.

Relevant part of .config file is:
#
# Network device support
#
CONFIG_NETDEVICES=y

#
# ARCnet devices
#
# CONFIG_ARCNET is not set
CONFIG_DUMMY=m
# CONFIG_BONDING is not set
# CONFIG_EQUALIZER is not set
CONFIG_TUN=m
CONFIG_ETHERTAP=m

#
# Ethernet (10 or 100Mbit)
#
CONFIG_NET_ETHERNET=y
CONFIG_SUNLANCE=y

Machine is Sun Ultra1 (sun4u architecture), Debian Woody/Stable, 
sparc64-linux-gcc --version gives me egcs-2.92.11

Any help, comments, ideas will be very appreciated!

           Thanks

                   mARTin

-- 
Martin Rusko
PhD student
Department of Automation and Measurement
Faculty of Mechanical Engineering
Slovak University of Technology
--
E-mail: rusko at sunsite.mine.nu
Web:    http://sunsite.mine.nu/~rusko
--
motto: We are Microsoft! Resistance is futile. Open your
         source code and prepare for assimilation.


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