This might be a lib problem or something, I first noticed it after the system was upgraded by a bunch of new  libraries and stuff. (libc=5.3.12; glibc=2.1.1; apache 1.3.6, kernel=2.2.5)

The simplest program that causes the crash is: (crash.php3)

<?php
echo "fopen()=", $fh = fopen("/tmp/file.txt","w"), "<br>\n";
echo "fclose()=", fclose($fh), "<br>\n";
?>

Yes, fopen() opens fine, tested seperately also. Can read and write from a file fine, just crashing when closes.

From apache error_log:
[notice] child pid 16580 exit signal Segmentation fault (11)

From strace output against apache
16580 13:53:50 stat("/tmp/file.txt", {st_mode=0, st_size=0, ...}) = 0
16580 13:53:50 stat("/tmp", {st_mode=0, st_size=0, ...}) = 0
16580 13:53:50 open("/tmp/file.txt", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 5
16580 13:53:50 close(5)                 = 0
16580 13:53:50 --- SIGSEGV (Segmentation fault) ---
16580 13:53:50 chdir("/etc/httpd")      = 0
16580 13:53:50 SYS_174(0xb, 0xbfffe490, 0xbfffe404, 0x8, 0xb) = 0
16580 13:53:50 getpid()                 = 16580
16580 13:53:50 kill(16580, SIGSEGV)     = 0
16580 13:53:50 sigreturn()              = ? (mask now [])
16580 13:53:50 --- SIGSEGV (Segmentation fault) ---
16579 13:53:50 <... fcntl resumed> )    = 0

Yep, I know it's not very useful, but I'm out of places to look. It *looks* like a lib problem or something, but I don't know how to get any more low-level debugging. The system does not have gdb, so I can't generate a backtrace - will that show more info than strace? If so I can try and install that stuff. 

Feel free to contact me for more info, etc,