Unhandled level 2 translation fault (11) at 0x000000b8, esr 0x92000046, rpi3 (aarch64)

[Catalin Marinas]

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