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User-Agent: Mozilla/5.0 (compatible; Konqueror/3.5; Linux; X11; ru) KHTML/3.5.0 (like Gecko)

Description of problem:
After a approx 1 week of work one of my servers  
fail to run ifconfig or ifconfig -a. 
 
Output is 'stack smashing detected'.  
Other my hosts works without problem.  
 
ifconfig eth0 ... eth4 works 
ifconfig eth4.1  eth4.100 ... failed  

Version-Release number of selected component (if applicable):
net-tools-1.60-57

How reproducible:
Sometimes

Steps to Reproduce:
1. Wait approx 1 week after reboot at one of may hosts (sorry). 
2. Run ifconfig or ifconfig -a 
 
   

Actual Results:  Stack smashing detected, not other output. 

Expected Results:  Output if interfaces status. 

Additional info:

This host have 14 interfaces, some of them VLAN. 
 
stack trace from ifconfig: 
 
#0  0x00d63235 in raise () from /lib/libc.so.6 
#1  0x00d647ce in abort () from /lib/libc.so.6 
#2  0x00d97826 in __fsetlocking () from /lib/libc.so.6 
#3  0x00e18799 in __stack_chk_fail () from /lib/libc.so.6 
#4  0x0804f855 in if_readlist_proc (target=Variable "target" is not available. 
) at interface.c:373 
#5  0x0804f86d in if_readlist () at interface.c:415 
#6  0x0804fa6a in for_all_interfaces (doit=0x8051960 <do_if_print>, 
    cookie=0x8057c8c) at interface.c:134 
#7  0x08049415 in if_print (ifname=0x0) at ifconfig.c:113 
#8  0x0804a7a5 in main (argc=0, argv=0xbfa23534) at ifconfig.c:357