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STM32 ISR Count Doesn't match the real data - Is this STM32 interrupt handling bug?

Question asked by w..frank on Aug 15, 2011

I am doing a very simple test, enable EXT11 interrupt. In the ISR, I toggle a GPIO pin. I connect the scope to both EXT11 line and the GPIO I am toggling in the ISR.

They somehow do not match. It seems ISR is skipping 2 beats out of 8 (at this in my test case). 

Has anybody had a similar issue? What I could be doing wrong? The whole thing is so simple that it should just work, unless there is some major bug in interrupt handling part of STM32.