On Mon, 1 Aug 2022, Feng Tang wrote: > > Or does it make sense to prohibit KASAN+SLUB_DEBUG combination? Does > > SLUB_DEBUG add anything on top of KASAN? > > I did a quick glance, seems the KASAN will select SLUB_DEBUG in > many cases, as shown in the lib/Kconfig.kasan: > > config KASAN_GENERIC > ... > select SLUB_DEBUG if SLUB > > config KASAN_SW_TAGS > ... > select SLUB_DEBUG if SLUB SLUB_DEBUG is on by default on all distros. This just means that debugging support is compiled in but not activated. Kasan etc could depend on SLUB_DEBUG. Without SLUB_DEBUG the debugging infrastructure of SLUB that is use by Kasan is not included. If you want to enable debugging on bootup then you need to set SLUB_DEBUG_ON.
