SLUB debugging on by default

configname: CONFIG_SLUB_DEBUG_ON

Linux Kernel Configuration
└─>Memory Debugging
└─>SLUB debugging on by default
In linux kernel since version 2.6.23 (release Date: 2007-10-09)  
Boot with debugging on by default. SLUB boots by default with
the runtime debug capabilities switched off. Enabling this is
equivalent to specifying the "slub_debug" parameter on boot.
There is no support for more fine grained debug control like
possible with slub_debug=xxx. SLUB debugging may be switched
off in a kernel built with CONFIG_SLUB_DEBUG_ON by specifying
"slub_debug=-".