Hello. I've searched the internet and found many things relating to this, but I thought I would present my own specific problem. I'm trying to install mod_perl with IBM HTTP Server (which is really just apache 1.3.12) on AIX 4.3.3. Everything installs fine, but when I tried to use Net::LDAP, apache segfaults. When I analyze the core file, I'm told that boot_IO is where the problem occurred. Has anyone conquered this problem? The mod_perl readme says that if you are installing on AIX with perl 5.00503 you have to apply a patch to prevent segfaulting when an XS module is called. I applied it and re-compiled. I also tried using perl 5.6.1, which yielded the same results. I've traced it down to the 'use IO::Handle;' clause. I'm using the VisualAge C (vac) compiler to compile everything (gcc hasn't worked very well for most things on this platform.) All things in this message that don't work in mod_perl work fine if they're not run from apache under mod_perl. The following details the method to my madness: # lslpp -l |grep vac vac.msg.en_US.C 5.0.1.0 COMMITTED C for AIX Compiler vacpp.cmp.rte 4.0.2.0 COMMITTED VisualAge C++ Compiler vac.C 5.0.1.0 COMMITTED C for AIX Compiler # lslpp -l |grep xlC xlC.aix43.rte 4.0.2.2 APPLIED C Set ++ Runtime for AIX xlC.cpp 4.3.0.1 COMMITTED C for AIX Preprocessor xlC.msg.en_US.cpp 4.3.0.1 COMMITTED C for AIX Preprocessor xlC.msg.en_US.rte 4.0.2.0 COMMITTED C Set ++ Runtime xlC.rte 4.0.2.0 COMMITTED C Set ++ Runtime <installed the mod_perl patch on perl_5.00503/ext/DynaLoader/dl_aix.xs> # cd /usr/build/perl_5.00503 # ./Configure -de # make # make install # perl -MCPAN -e shell; (answer configuration questions...) cpan> install HTML::HeadParser cpan> install LWP::UserAgent # cd /usr/build/mod_perl-1.25 # perl Makefile.PL USE_APXS=1 WITH_APXS=/usr/HTTPServer/bin/apxs \ EVERYTHING=1 # make # make install # cd /usr/HTTPServer/bin # ./apachectl configtest Syntax OK At this point, lots of perl scripts will run fine under mod_perl, until one of them calls 'use IO::Handle;' ... then: # ./apachectl configtest ./apachectl[145]: 19372 Segmentation fault(coredump) Now I analyze the core file to find out what is causing the dump.. surprise! # dbx /usr/HTTPServer/bin/httpd core Type 'help' for help. reading symbolic information ...warning: no source compiled with -g [using memory image in core] Segmentation fault in boot_IO at 0xd178d39c ($t1) 0xd178d39c (boot_IO+0xc) 80830000 lwz r4,0x0(r3) ---------------------------------------------------- Thinking it might be IBM HTTP Server implementation, I built apache from source with the following method (I did this with Apache 1.3.12 and Apache 1.3.20): # cd /usr/build/apache_1.3.12 # ./configure --enable-module=so \ --enable-module=proxy \ --enable-shared=proxy \ --prefix=/usr/local/apache # make # make install Then I repeated the mod_perl installation. Same darn segfault. Does anyone have any insight into this? It's becoming a very painful battle. If you're curious, here's my output from perl -V: Summary of my perl5 (5.0 patchlevel 5 subversion 3) configuration: Platform: osname=aix, osvers=4.3.3.0, archname=aix uname='aix proxysvr 3 4 0025507c4c00 ' hint=recommended, useposix=true, d_sigaction=define usethreads=undef useperlio=undef d_sfio=undef Compiler: cc='cc', optimize='-O', gccversion= cppflags='-D_ALL_SOURCE -D_ANSI_C_SOURCE -D_POSIX_SOURCE -qmaxmem=8192 -I/usr/local/include' ccflags ='-D_ALL_SOURCE -D_ANSI_C_SOURCE -D_POSIX_SOURCE -qmaxmem=8192 -I/usr/local/include' stdchar='unsigned char', d_stdstdio=define, usevfork=false intsize=4, longsize=4, ptrsize=4, doublesize=8 d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=8 alignbytes=8, usemymalloc=n, prototype=define Linker and Libraries: ld='ld', ldflags =' -L/usr/local/lib' libpth=/usr/local/lib /lib /usr/lib /usr/ccs/lib libs=-lnsl -lgdbm -ldbm -ldl -lld -lm -lc -lcrypt -lbsd -lPW libc=, so=a, useshrplib=false, libperl=libperl.a Dynamic Linking: dlsrc=dl_aix.xs, dlext=so, d_dlsymun=undef, ccdlflags='-bE:perl.exp' cccdlflags=' ', lddlflags='-bhalt:4 -bM:SRE -bI:$(PERL_INC)/perl.exp -bE:$(BASEEXT).exp -b noentry -lc -L/usr/local/ lib' Characteristics of this binary (from libperl): Built under aix Compiled at Jul 8 2001 23:40:44 @INC: /usr/local/lib/perl5/5.00503/aix /usr/local/lib/perl5/5.00503 /usr/local/lib/perl5/site_perl/5.005/aix /usr/local/lib/perl5/site_perl/5.005 Thanks for your time, Matt