On Mon, Jan 09, 2017 at 07:06:19PM +0100, Bas van Tiel wrote:

quoted

I defined STACKSIZE to the kernel's SIGSTKSZ (16384) and it seems to run
fine, though I'll leave it longer/overnight (on a Juno board). With the
4K signal stack it was crashing shortly after start.

I tried the STACKSIZE of 16384 for both the RPI3 and the PINEA64 board
and still see the same behaviour of crashing. Sometimes the process
is also blocked for a long time before it crashes.

Setting the interval to 200 usec [5 Khz] will help to crash it faster.

To further isolate the issue I will create a kernel module (based on a
hrtimer) that will sent a periodic signal to the registered process
and execute the same sighandler logic to check if the problem is still
there.

I lowered the interval to 100us (it was 100ms in the original file) and
I can indeed trigger segfault easily on Juno. But it doesn't fail in the
same way every time, I sometimes get permission fault, other times bad
frame.

-- 
Catalin