if a remove cache operation in the legacy kernel fails, there are no warnings in log, messages or any display of the failed result at all.
the ezDir::recursiveDelete() returns "false" on failure, but this result is not used. also, the function itself does not issue any warning or error to the logs.
- symlink some var/cache/ini folder to some place outside root dir, or manually remove it
- with debug enabled, clear ini caches from admin or command line with --clear-tag=ini
- caches in that folder are not deleted (or found), but no message about the result can be seen, either in the logs or the result of the operation