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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
Latest reply on Aug 15, 2011 by Clive One

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. 

(even bloody forum post took several tries, come on ST get a grip)