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panic in thread_invoke

Hi,

I am having a problem with my kext keep panicing in thread_invoke().

The exact error message is
panic: thread_invoke: preemption_level 1

In my code, I have a function which already hold a network funnel,
then enter this while loop in which it will sleep until an event
happen
and spawn a new thread to handle some computation.

The new thread will also try to grab the network_funnel and will
release it
when it returns.

My kext kept panicing on the second loop, after it spawns a new thread
and sleep again waiting for an event to happen.

Does anyone ever comes across this issue before??

Thanks for your help.

Regards,
Herry Wiputra
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