Port Bug Report: connecting with psql v. 6.4.2 kill 6.5 backend!

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                        POSTGRESQL BUG REPORT TEMPLATE
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Your name               : Palle Girgensohn
Your email address      : girgen@partitur.se

Category                : runtime: back-end
Severity                : critical

Summary: connecting with psql v. 6.4.2 kill 6.5 backend!

System Configuration
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  Operating System   : FreeBSD 3.2-STABLE

  PostgreSQL version : 6.5

  Compiler used      : gcc-2.7.2.1

Hardware:
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pentium 128 MB,
FreeBSD stordatan.palle.se 3.2-STABLE FreeBSD 3.2-STABLE #0: Thu Jul  8 05:41:27 CEST 1999
root@stordatan.palle.se:/usr/src/sys/compile/PALLE3 i386 


Versions of other tools:
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gmake...

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Problem Description:
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When connecting to the a 6.5 postmaster from another host
with 6.4.2 installed, the backend dies:

ERROR:  postmaster: getprotobyname failed
Segmentation fault (core dumped)

a backtrace from gdb:
(gdb) bt
#0  0x281d0b23 in siglongjmp () from /usr/lib/libc.so.3


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Test Case:
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install & run postgres 6.4.2 on one machine
install & run postgres 6.5 on another


pg-6.4.2$ psql -h pg-6.5

BOOM




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Solution:
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