WITNESS not always working

Hi,

I have a problem with lock assertions and apparently it's been ongoing
for a while.

I am working on Linux derived drivers with lock assertions and we have
users hitting them.  Yet I have not hit them in months of using the
drivers.

This time it was even more curious:

I've done a rebase and a full rebuilt of my work branch, booted the kernel,
loaded the driver (manually) and it went kaboom on a lock assertion right
away.

I reset from ddb and bootes the same kernel and (manually) loaded the
driver again and nothing happened.  I unloaded the driver which is a
current PR and nothing, so I checked again and;

I use the GENERIC-MMCCAM kernel config which includes GENERIC which includes
std.debug so this is alright:
# sysctl kern.features.witness kern.features.invariants
kern.features.witness: 1
kern.features.invariants: 1


Does anyone have any idea as to why witness may not do its job (sometimes)?

/bz

-- 
For there shall arise false Christs, and false prophets, and shall shew
great signs and wonders; insomuch that, if it were possible, they shall
deceive the very elect. Behold, I have told you before. [Mat. 24:24-25]