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?