Hi,
I am working on a implementing of network driver...

Say i hv driver nic0 and my driver is properly loaded for this device.
Now, when I do "ifconfig nic0".... It gives proper output... Now then I am doing some data transfer over it using iperf... then again I do "ifconfig nes0" and this time it gives segmentation fault....

I am using FC4 32bit and 2.6.11 Kernel..

Now, I thot if I have issue in my driver, I shud get crash and not Segfault...

So, I changed ifconfig binary.... I had other RHEL4u3 box... I took ifconfig binary from that....Surprisingly, it worked properly.


So, I am wondering
1. May be there can be some problem with ifconfig, but then why it worked for the first time?
2. For all other default NICs, it is working properly? why is it so?
3. In my case, only "ifconfig nic0" is not working (with default ifconfig binary), If i do "ifconfig" or "ifconfig -a", these are working fine...

Please shed some light.

segmentation fault can be due to various reasons like driver,NIC or cable .can you post your ifconfig -a when this happens again.for ifconfig eth0 verify the corresponding interface file something like (etc/sysconfig/network-scripts/ifcfg-eth0)

Please find output of ifconfig -a

[root@qa26 sbin]# ifconfig -a
eth0 Link encap:Ethernet HWaddr 00:30:48:57:51:EA
inet addr:192.168.54.26 Bcast:192.168.255.255 Mask:255.255.0.0
inet6 addr: fe80::230:48ff:fe57:51ea/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:32662 errors:0 dropped:0 overruns:0 frame:0
TX packets:4862 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:3351363 (3.1 MiB) TX bytes:840046 (820.3 KiB)
Interrupt:58 Base address:0x2000

eth1 Link encap:Ethernet HWaddr 00:30:48:57:51:EB
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
Interrupt:66 Base address:0xa000

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:74 errors:0 dropped:0 overruns:0 frame:0
TX packets:74 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:5756 (5.6 KiB) TX bytes:5756 (5.6 KiB)

XXXXXXXX Link encap:Ethernet HWaddr XX:XX:XX:XX:XX:XX
inet addr:10.168.54.26 Bcast:10.168.255.255 Mask:255.255.0.0
inet6 addr: fe80::212:55ff:fe02:2c30/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:251 errors:0 dropped:0 overruns:0 frame:0
TX packets:193 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:18308 (17.8 KiB) TX bytes:17081 (16.6 KiB)
Interrupt:74 Memory:cd5fe000-cd5ff000

sit0 Link encap:IPv6-in-IPv4
NOARP MTU:1480 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)




The device which is xxxxxx. I am talking about this.
If I do ifconfig eth0 --> I am getting proper result.
If I do ifconfig XXXXX --> I am NOT getting proper result.

Why is it so? And as I mentioned above both the commands work properly if i use binary from rhel4u3 32 bit machine....



Thanks,

have you taken this log after the fault ?..It is perfect ..If i am not wrong ..can you check the MTU on other box ..(it should 1500).