Fisher beta3 installed on K6-2 machine seems to have serious problems
with resolver libraries.   In short name resolution does not work
regardless of a content of /etc/resolv.conf and /etc/nsswitch.conf. In
particular trying to get an information from a local name server
resulted in 'nslookup' and 'dig' dumping cores.  Here is what 'file' has
to say:

core: ELF 32-bit LSB core file of 'dig' (signal 11), Intel 80386,
version 1, from 'dig'

and this is gdb on the same core file.

(gdb) where
#0  0x402def2e in __select () from /lib/libc.so.6
#1  0x4020bc84 in __DTOR_END__ () from /usr/lib/libisc.so.3
#2  0x401cca84 in pthread_start_thread (arg=0xbf3ffc00) at manager.c:274

Jakub Jelinek suggested that this may be related to #25437.  Possible
it is, but in this case an IP number of a name server in /etc/resolv.conf
is definitely valid and none of other clients on the same network
(these are various Linux, both x86 and Alpha, and Windows machines
all of them using the same server) shows any troubles with a name
resolution.

Attempts to "strace" a command like 'host slashdot.org' do not show
anything unusual and these logs make an impression that a name server
is not responding (while it is responding just fine for anybody else).
There are no troubles to 'ping' this server by its IP number and,
after its name was added to /etc/hosts on a "stricken" machine, remote
logins by name and various means (ssh, telnet, rsh) work fine without any
trace of a delay.

  Michal
  michal@harddata.com

p.s. this is filed under 'bind' because of cores from 'dig' and 'nslookup'
bug quite likely this should really be 'glibc'.