rawhide kernel debug config not warning on sleeping allocation under spinlock?

[Stephen Smalley]

Hi,

In testing a recent kernel patch using the debug kernel configs from the
Fedora rawhide kernel package, I didn't get any warnings about a case
where the code was performing a non-atomic kmalloc while holding a
spinlock, despite the fact that CONFIG_DEBUG_SPINLOCK_SLEEP was enabled.

In experimenting further, I found that I do get the warnings if I
switched from SLUB to SLAB (as mm/slab.c includes tests of might_sleep),
or if I use SLUB but enable DEBUG_PAGEALLOC as well (in which case the
warnings are emitted by the mm/page_alloc.c code).  I also turned on
PREEMPT as per Documentation/SubmitChecklist for good measure.

Is this a known issue?  Should the rawhide kernel debug config include
the necessary options to ensure that such warnings show up there?

-- 
Stephen Smalley
National Security Agency