backend crashing on NetBSD 1.3.2/i386

Until earlier this week, the various snapshots have been working fine
on my system, NetBSD 1.3.2/i386.  As of a couple of days ago the
backend started to crash.  I hoped this was a temporary glitch with
recent patches which would disappear in a day or so as other stuff got
sorted out.  Nothing seems to have changed, though, over the last
several days, and connections fail with the backend crashing.

Everything seems to compile fine; the only warnings during backend
compilation are given below.  The select warning in s_lock.c requires
an
   #include <unistd.h>

to remove it, but that doesn't fix the crashing problem.  I would
suggest a patch for that, but I'm not sure what systems have unistd.h
and what don't, so I'm not sure if the obvious thing of putting that
line in s_lock.c is the right thing to do.

Can anyone with more experience tracking down crashing backends give
some guidance?  I hate to see 6.4 shipped with one of the supported
backends crashing!  Unfortunately, I'm not sure where to look.  I
didn't notice any suspicious patches coming through in the last few
days, but I don't see everything that is committed.  I'm also not sure
if the NetBSD/vax patches could have affected NetBSD/i386 stuff.

Any help is greatly appreciated!

Cheers,
Brook

===========================================================================
Warnings found during backend compile; directories noted, but lots of
commands deleted.  In the past I have seen warnings about some of the
bison/lexer stuff, so I tend to ignore them; I'm not sure if these are
different than the "normal" warnings.
    gmake[2]: Entering directory `/usr/pkgsrc-local/databases/postgresql-current/work/pgsql/src/backend/bootstrap'
gcc-I../../include -I../../backend   -I/usr/pkg/include -I/usr/pkg/include/tcl8.0 -I/usr/pkg/include/tk8.0 -O2 -pipe
-Wall-Wmissing-prototypes -I.. -Wno-error   -c bootparse.c -o bootparse.o    /usr/pkg/share/bison.simple: In function
`Int_yyparse':   /usr/pkg/share/bison.simple:327: warning: implicit declaration of function `Int_yyerror'
/usr/pkg/share/bison.simple:387:warning: implicit declaration of function `Int_yylex'    gcc -I../../include
-I../../backend  -I/usr/pkg/include -I/usr/pkg/include/tcl8.0 -I/usr/pkg/include/tk8.0 -O2 -pipe  -Wall
-Wmissing-prototypes-I.. -Wno-error   -c bootscanner.c -o bootscanner.o    lex.Int_yy.c:683: warning: no previous
prototypefor `Int_yylex'    bootscanner.l:137: warning: no previous prototype for `Int_yyerror'
 
    gmake[2]: Entering directory `/usr/pkgsrc-local/databases/postgresql-current/work/pgsql/src/backend/parser'    gcc
-I../../include-I../../backend   -I/usr/pkg/include -I/usr/pkg/include/tcl8.0 -I/usr/pkg/include/tk8.0 -O2 -pipe  -Wall
-Wmissing-prototypes-I.. -Wno-error   -c gram.c -o gram.o    /usr/pkg/share/bison.simple: In function `yyparse':
/usr/pkg/share/bison.simple:327:warning: implicit declaration of function `yyerror'    /usr/pkg/share/bison.simple:387:
warning:implicit declaration of function `yylex'    gcc -I../../include -I../../backend   -I/usr/pkg/include
-I/usr/pkg/include/tcl8.0-I/usr/pkg/include/tk8.0 -O2 -pipe  -Wall -Wmissing-prototypes -I.. -Wno-error   -c scan.c -o
scan.o   lex.yy.c:820: warning: no previous prototype for `yylex'    scan.l:426: warning: no previous prototype for
`yyerror'   lex.yy.c:2174: warning: `yy_flex_realloc' defined but not used
 
    gmake[3]: Entering directory `/usr/pkgsrc-local/databases/postgresql-current/work/pgsql/src/backend/storage/buffer'
  gcc -I../../../include -I../../../backend   -I/usr/pkg/include -I/usr/pkg/include/tcl8.0 -I/usr/pkg/include/tk8.0 -O2
-pipe -Wall -Wmissing-prototypes -I../..   -c s_lock.c -o s_lock.o    s_lock.c: In function `s_lock':    s_lock.c:70:
warning:implicit declaration of function `select'
 
    gmake[2]: Entering directory `/usr/pkgsrc-local/databases/postgresql-current/work/pgsql/src/backend/utils'    gcc
-I../../../include-I../../../backend   -I/usr/pkg/include -I/usr/pkg/include/tcl8.0 -I/usr/pkg/include/tk8.0 -O2 -pipe
-Wall-Wmissing-prototypes -I../..   -c network.c -o network.o    network.c: In function `network_network':
network.c:392:warning: unused variable `ptr'    gcc -I../../../include -I../../../backend   -I/usr/pkg/include
-I/usr/pkg/include/tcl8.0-I/usr/pkg/include/tk8.0 -O2 -pipe  -Wall -Wmissing-prototypes -I../..   -c inet_net_ntop.c -o
inet_net_ntop.o   inet_net_ntop.c: In function `inet_net_ntop_ipv4':    inet_net_ntop.c:192: warning: unused variable
`m'   gcc -I../../../include -I../../../backend   -I/usr/pkg/include -I/usr/pkg/include/tcl8.0 -I/usr/pkg/include/tk8.0
-O2-pipe  -Wall -Wmissing-prototypes -I../..   -c inet_net_pton.c -o inet_net_pton.o    inet_net_pton.c: In function
`inet_cidr_pton_ipv4':   inet_net_pton.c:104: warning: `tmp' might be used uninitialized in this function
 
    gmake[3]: Entering directory `/usr/pkgsrc-local/databases/postgresql-current/work/pgsql/src/backend/utils/fmgr'
gcc-I../../../include -I../../../backend   -I/usr/pkg/include -I/usr/pkg/include/tcl8.0 -I/usr/pkg/include/tk8.0 -O2
-pipe -Wall -Wmissing-prototypes -I../..   -c dfmgr.c -o dfmgr.o    dfmgr.c:283: warning: no previous prototype for
`trigger_dynamic'