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

[Catalin Marinas]

On Tue, Jan 10, 2017 at 12:14:23PM +0000, Catalin Marinas wrote:
> 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.

With 100us interval, it segfaults on x86 fairly quickly as well, so I
don't think it's a kernel issue.

-- 
Catalin