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Observer
Observer
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Registered: ‎01-08-2014

Petalinux task in "D" (uninterruptible disk sleep) state waiting on ioctl...

... however, driver ioctl is never invoked. This leads to a hopelessly deadlocked state as the task involved is waiting for a heartbeat from hardware which drives the system. /proc/[pid]/task/[tid]/status shows task is in "D" state and syscall shows last call was the ioctl.

 

This happens at irregular times during system operation, but never less than a few minutes after startup. The heartbeats occur at 200Hz.

 

Why would the ioctl call from user-space not cause the driver ioctl to be invoked?

 

I am running Petalinux 2015.4.

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