On Sun, Aug 15, 2021 at 07:23:03PM +0900, Tetsuo Handa wrote:
> Hello.
>
> I'm frequently hitting "BUG: Invalid wait context", and
> it seems that this problem is not fixed yet.
>
> This is a problem between spinlock versus raw_spinlock. check_wait_context()
> complains if we try to take a spinlock when we already hold a raw_spinlock.
Disable this option:
config PROVE_RAW_LOCK_NESTING
bool "Enable raw_spinlock - spinlock nesting checks"
depends on PROVE_LOCKING
default n
help
Enable the raw_spinlock vs. spinlock nesting checks which ensure
that the lock nesting rules for PREEMPT_RT enabled kernels are
not violated.
NOTE: There are known nesting problems. So if you enable this
option expect lockdep splats until these problems have been fully
addressed which is work in progress. This config switch allows to
identify and analyze these problems. It will be removed and the
check permanently enabled once the main issues have been fixed.
If unsure, select N.
If you're not working on removing these splats yourself, then reporting
them has little value.
