5.99.41 kernel not compatible with 5.99.51 userspace

[Adam Hamsik <haaaad%gmail.com@localhost>]

Hi folks, 

Today I have accidentally booted 5.99.41 kernel on 5.99.51 userland and I have
found out that network stopped working at all here is small screen log.

[haad@musasi ~]$ netstat -ant  
Active Internet connections (including servers)
Proto Recv-Q Send-Q  Local Address          Foreign Address        State
tcp        0     48  10.0.0.107.22          10.0.0.102.49355       ESTABLISHED
tcp        0      0  *.80                   *.*                    LISTEN
tcp        0      0  *.22                   *.*                    LISTEN
udp        0      0  *.68                   *.*                   
Active Internet6 connections (including servers)
Proto Recv-Q Send-Q  Local Address          Foreign Address        (state)
tcp6       0      0  *.80                   *.*                    LISTEN
tcp6       0      0  *.22                   *.*                    LISTEN
Active UNIX domain sockets
Address  Type   Recv-Q Send-Q    Inode     Conn     Refs  Nextref Addr
c48de280 dgram       0      0        0 c48de800        0 c48de480 -> 
/var/run/log
c48de480 dgram       0      0        0 c48de800        0        0 -> 
/var/run/log
c48de800 dgram       0      0 cf16cb78        0 c48de280        0 /var/run/log
[haad@musasi ~]$ netstat -anr
Routing tables

Internet:
Destination        Gateway            Flags    Refs      Use    Mtu Interface
af 0: Q00          link#1             UC          2 14850924507773796352      - 
 ???
default            00:22:2d:41:7f:d7  UHLc        0 14850924507773796370      - 
 ???
(27) 
Q7c.c4.58.b9.8e.c4.39.00.40.04.07.00.00.00.c4.b8.8e.c4.18.b8.8e.c4.20.62.8c.c4.05.24.00.00.01.00.00.00.a5.00.00.00.28.15.19.ce.00.9c.98.c4.00.00.00.00.a0.61.8c.c4.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00
 00:1b:63:02:14:47  UHLc        1 14850924507773796517      -  ???
netstat: kvm_read: Bad address
00:1b:63:02:14:47  127.0.0.1          UH          0 14162444239522234368      - 
 /??

AppleTalk:
Destination        Gateway            Flags    Refs      Use    Mtu Interface

Internet6:
Destination                        Gateway                        Flags    Refs 
     Use    Mtu Interface
default            ::1                            UH          0 
14162444239522234368      -  `??
af 0: Q00          link#1             UC          0 14850924507773796352      - 
 ?J?
default            20:cf:30:ba:2c:0c  UHL         0 14162444239522234368      - 
 ?J?
af 0: Q00          fe80::1%2                      U           0 
14162444239522234368      -  d??
default            link#2             UHL         0 14162444239522234368      - 
 d??
af 0: Q00          link#1             UC          0 14850924507773796352      - 
 ?J?
af 0: Q00          ::1                            UC          0 
14162444239522234368      -  `??
af 0: Q00          link#1             UC          0 14850924507773796352      - 
 ?J?
af 0: Q00          ::1                            UC          0 
14162444239522234368      -  `??
[haad@musasi ~]$ ifconfig -a                                                    
                                            
ifconfig: getifaddrs: No such file or directory
[haad@musasi ~]$ uname -a
NetBSD musasi.haad.chillisys.com 5.99.41 NetBSD 5.99.41 (GENERIC) #0: Tue Dec 
14 17:36:02 CET 2010  
buildbot%musasi.haad.chillisys.com@localhost:/usr/devel/buildslave/obj/i386/sys/arch/i386/compile/GENERIC
 i386

With new 5.99.51 kernel everything works fine. Does anyone has an idea what 
might be wrong ?

Regards

Adam.