ChibiOS Free Embedded RTOS

Hello,
after a variable amount of time, my program stops working (it could be a minute, an hour, 1 second)
I have 3 thread,
1) read from SPI the MEMS and it is run every 500ms
2) is on waiting a wake-up event from EXTI callback
3) perform the initialization and normal operation for a bluenrg chip through another SPI, it runs every 1ms (the fastest I made it run, the quickest the problem arises)

in the point when I write something to SPI and I need to wait data from the other chip, I've used a binary semaphore with timeout (the thread nr.2 gives a signal once the activities are done, means reading from SPI until the irq line drove by bluenrg chip is kept high).
I have a problem now, the system stop working and from openocd I got the message:
Program received signal SIGINT, Interrupt.
chSysHalt (reason=0x800d478 "SV#8") at ../../../os/rt/src/chsys.c:179

I read from the wiki that SV#8 means "The macro CH_IRQ_PROLOGUE() has not been placed at very beginning of an ISR or it has been placed within a critical zone"

Since I use a EXTI callback, I never use CH_IRQ_PROLOGUE on the callback.
Any idea how to solve this problem?

Thanks

It could be a problem with IRQ priorities, do you have interrupt sources external to the HAL? If so you are assigning to it an invalid priority, valid are 2..15.

Giovanni

Indeed I've changed STM32_EXT_EXTI3_IRQ_PRIORITY from 6 to 0 (since ST original code was assigning this value to the interrupt source). I'll try with value above 2.
Thank you! I would never ever spotted this one.

After I've changed the value of irq from 0 to 2 it seems to work flawlessly!
Thanks!