Kernel Extensions Won't Load On Fresh High Sierra Install

[Michael Crawford]

I strongly suspect that this is a High Sierra bug but really I don't
know. I hope to fix this myself but I don't have a clue.

My driver stack has three kernel extensions. Normally two of them
always load while the third loads when my USB dongle is attached.

If I install this product on a totally clean High Sierra install, then
none of them will load after rebooting. This persists through many
reboots.

Forcing a kext cache rebuild has no effect:

$ sudo touch /System/Library/Extensions

However if High Sierra has been used for a while, or if High Sierra is
installed on top of Sierra, then the kernel extensions load just fine.

My client is a fabless semiconductor firm; their customers are all
peripherals manufacturers. This bug was found by a customer in a
product that until now had been working really, really well.

Please help me, O Obi Wan K'Darwin-Drivers'i. You're my only hope!

Dumdfoundedly,

Mike
--
Mike Crawford
Portland Custom Software Development
mi...@soggywizards.com
http://soggywizards.com

One Must Not Trifle With Wizards For It Makes Us Soggy And Hard To Light
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[Michael Crawford]

I think this is a problem with High Sierra's User-Approved Kernel
Extension Loading.

Once I approve our kexts in Security Preferences, they will load but
won't actually work because graphics drivers must load early during
boot.

After reboot they won't load at all.

rdar://39219050

Thanks,

Mike Crawford
Portland Custom Software Development
mi...@soggywizards.com
http://soggywizards.com

One Must Not Trifle With Wizards For It Makes Us Soggy And Hard To Light.