kernel extension is still existed … | Apple Developer Forums

kernel extension is still existed when I use kextcache command to clear cache

Hi all,

I installed a kernel extension with bundle version 2.0.2 in Mac OS 10.15

Then I update a new kernel extension in bundle version 2.0.6 by below steps:

Step 1. pre-install:

sudo rm -rf /Library/Extensions/kextname.kext

Step 2. Install pkg with kernel extension in v2.0.6

Step 3. post-install:

sudo kextutil -v /Library/Extensions/kextname.kext
sudo kextcache -i /

Step 4. Reboot my Macbook Pro

Do some test with my kernel extensions in v2.0.6, kernel extension seem not working

Note: my kernel extension is the driver of usb device.

Step1: use tool to run some test

Step2: unplug usb device,

Step3: wait for 4~5 minutes,

Step4: reconnect usb device,

Step5: use tool to run test fail

Use below command to check

sudo kextstat | grep mykeyword

It shows bundle id with v2.0.2

Then, I use below commands to remove current kernel extension to debug this issue

sudo rm -rf /Library/Extensions/kextname.kext
sudo kextcache -i /
sudo kextcache --clear-staging
sudo reboot

After reboot,

my kernel extension is not existed in below path:

/Library/Extensions/

/Library/StagedExtensions/Library/Extensions/

Go to Apple Menu > About This Mac > Overview > System Report > Software > Extensions

my kernel extension is not found

Use below command to check

sudo kextstat | grep mykeyword

It still show bundle id with v2.0.2

After I update Mac OS to 10.15.1

it does not occur again.

I've seen a similar issue reported in below link

Is my issue the same as above link?

If yes, is there a way to clear and/or find the remained kernel extension manually?

Thanks.

Sean