am335x: 5.18.x: system stalling

[Yegor Yefremov]

Hi Arnd,

On Fri, May 27, 2022 at 8:57 AM Arnd Bergmann <arnd at arndb.de> wrote:
>
> On Fri, May 27, 2022 at 8:50 AM Tony Lindgren <tony at atomide.com> wrote:
> > * Arnd Bergmann <arnd at arndb.de> [220527 06:35]:
> > > On Fri, May 27, 2022 at 6:44 AM Yegor Yefremov <yegorslists at googlemail.com> wrote:
> > > > On Thu, May 26, 2022 at 4:16 PM Arnd Bergmann <arnd at arndb.de> wrote:
>
> > Based on what we just discussed on #armlinux, testing before and after
> > commit 9c46929e7989 ("ARM: implement THREAD_INFO_IN_TASK for uniprocessor
> > systems") might be a good idea as it enables some config options that
> > did not get enabled earlier.
> >
> > Another thing that might help is to bisect again and ensure vmap stack
> > config option stays disabled so issues related to vmap stack are kept
> > out of the way.
>
> Unfortunately the commits around 9c46929e7989 are the ones that failed
> to build according to the original report. But it's possible that the
> problem has something to do with
> CONFIG_CURRENT_POINTER_IN_TPIDRURO, which is disabled
> in the V6+SMP config, and which in turn is required for
> THREAD_INFO_IN_TASK, IRQSTACKS and STACKPROTECTOR_PER_TASK.
>
> If any of the four are the cause of the stall, then turning off ARCH_OMAP2 and
> CONFIG_CPU_V6 should show the same bug in older commits as well.

Both config options disabled:

# zcat /proc/config.gz | grep 'CONFIG_ARCH_MULTI_V6\|CONFIG_SMP'
# CONFIG_ARCH_MULTI_V6 is not set
CONFIG_ARCH_MULTI_V6_V7=y
# CONFIG_SMP is not set

This helped - no stalls.

Regards,
Yegor