Comment 23 for bug 1585614

I just had this on 14.04 this morning due to logrotate restarting apache. Manually starting apache worked.
This are the last lines in apache error.log.1:
[Thu May 26 06:45:09.064664 2016] [mpm_prefork:notice] [pid 62472] AH00171: Graceful restart requested, doing restart
apache2: Syntax error on line 140 of /etc/apache2/apache2.conf: Syntax error on line 1 of /etc/apache2/mods-enabled/php5.load: Cannot load /usr/lib/apache2/modules/libphp5.so into server: /lib/x86_64-linux-gnu/libm.so.6: symbol __strtold_nan, version GLIBC_PRIVATE not defined in file libc.so.6 with link time reference