[SOLVED] aix6 / 64-bit / Apache / libphp5 / dlopen problem

NevemTeve · 06-12-2015, 12:38 PM

It's a bit difficult to describe the problem, but I'll try:

o the problem doesn't occur in 5.x or 7.x, only in 6.x
o the problem doesn't occur in 32-bit only in 64-bit
o the problem occurs after Apache has loaded (dlopen'd) and unloaded (dlcose'd) every modules (including libphp5.so), then again tries to load mod_access.so (which is the first one in the list), but fails with errno=8 (ENOEXEC)
o there is no problem without php
o the error message doesn't make much sense:

Code:

dso.c: dlopen(/usr/local/libexec64/apache2/libphp5.so,0x10002) returned 0 errno=8: Exec format error
Cannot load /usr/local/libexec64/apache /mod_access_compat.so into server:
rtld: 0712-001 Symbol access_compat_module was referenced from module /usr/local/libexec64/apache/mod_access_compat.so(),
but a runtime definition of the symbol was not found.
rtld: 0712-002 fatal error: exiting.

o httpd version 2.4.7, php version 5.4.6, Oracle client version 10.2 (oci8 support in PHP)

NevemTeve · 06-12-2015, 02:35 PM

Here is there solution^W workaround:

1. build Apache
2. build PHP
3. build Apache, but make httpd executable depend on /usr/local/libexec64/libphp5.so
4. then dlopening/dlcosing libphp5.so will cause nobody harm; no one alarm.

NevemTeve · 02-25-2017, 10:16 AM

This problem might be related with this: AIX relink warning

NevemTeve · 04-04-2018, 01:31 PM

Note: I've just found out that this workaround negatively affects Apache's restart/graceful_restart features: when Apache restarts, zend's memory-management might get confused. Also this hack became unnecessary when I fixed the Oracle client's export problem.

NevemTeve · 06-05-2018, 03:15 AM

(I keep bloggig, hope it doesn't disturb you) No, I have this problem again. The difference that there have been a restart (due to power failure). So the problem might depend on the global state of loaded shared objects.

Code:

# genkld -d | egrep '(libphp|libclntsh)'
 900000003686000  1594ebc  9000000048e0e5f   17ac31 /usr/local/libexec64/apache2/libphp7.so
 900000006b2f000  25ef86e  9001000a0d00af0   25c0b4 /opt/lib64/libclntsh.so.11