Possible bug on libv4l read() emulation

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I have a program where I use libv4l's read() emulation for simplicity.
But with most v4l2 webcams I've tried, I get kernel panics.

I have pics of the message if anyone cares to see them, I don't want
to flood the mailing list.

Basically, the names I see in the kernel panic from a uvcvideo card is:

uvc_queue_next_buffer
__bad_area_no_semaphore
do_page_fault

And a lot more.

TIA.
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