Description:
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The problem described in #19292 is still there. 
It's rare, but exists. Getting the error for virtualhosts 
that have no open_basedir defined. 
 
Seems open_basedir restriction form some other virtual 
host is in effect. 
 
Error message: 
 
open_basedir restriction in effect. File 
(/home/system/basesys.php) is not within the allowed 
path(s): (/tmp:/home/users/user1) in 
/home/system/modules/module.php) on line 26 
 
it was said in #19292 setting open_basedir to none in 
every other virtualhost would help, but this is not a 
solution but a workaround. and in some cases a painful 
one.