Re: [PATCH] lib/Kconfig.debug: disable FRAME_WARN for kasan and kcsan

[Alexander Potapenko]

> > > Are kernels with KASAN || KCSAN || KMSAN enabled supposed to be bootable?
> >
> > They are all intended to be used for runtime debugging, so I'd imagine so.
>
> Then I strongly suggest putting a nonzero value here.  As you write
> that "with every release of LLVM, both of these sanitizers eat up more and more
> of the stack", don't you want to have at least some canary to detect
> when "more and more" is guaranteed to run into problems?

FRAME_WARN is a poor canary. First, it does not necessarily indicate
that a build is faulty (a single bloated stack frame won't crash the
system).
Second, devs are unlikely to fix a function because its stack frame is
too big under some exotic tool+compiler combination.
So the remaining option would be to just increase the frame size every
time a new function surpasses the limit.