"Trying to free already-free IRQ 16" message and segfaulting cat on /proc/interrupt

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Hi!
In my custom module when I'm freeing shared interrupt line with
free_irq() I get "Trying to free already-free IRQ 16" message in dmesg
output and when I try to "cat /proc/interrupts" it segfaults. If I
load my module again then "cat /proc/interrupts" works but I see
multiple instances of my driver registered with one interrupt line.
Why is it so?

Thanks in advance.

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