[next] arm: Internal error: Oops: 5 PC is at __read_once_word_nocheck

[Naresh Kamboju]

Hi  Ard and Russell,

Your three patches applied and tested on x15 tested by Daniel and reported
kernel crash did not find it after multiple iterations.

ARM: unwind: set frame.pc correctly for current-thread unwinding
ARM: entry: fix unwinder problems caused by IRQ stacks
ARM: Revert "unwind: dump exception stack from calling frame"

Tested-by: Linux Kernel Functional Testing <lkft at linaro.org>

Build url:
https://builds.tuxbuild.com/26DZbOeAxshMvtU2FhS3Fytr7NS/

vmlinux: https://builds.tuxbuild.com/26DZbOeAxshMvtU2FhS3Fytr7NS/vmlinux.xz
zImage: https://builds.tuxbuild.com/26DZbOeAxshMvtU2FhS3Fytr7NS/zImage
System.map: https://builds.tuxbuild.com/26DZbOeAxshMvtU2FhS3Fytr7NS/System.map

LAVA test jobs ran on x15 device:
https://lkft.validation.linaro.org/scheduler/job/4702341
https://lkft.validation.linaro.org/scheduler/job/4702344
https://lkft.validation.linaro.org/scheduler/job/4702348
https://lkft.validation.linaro.org/scheduler/job/4702350
https://lkft.validation.linaro.org/scheduler/job/4702352
https://lkft.validation.linaro.org/scheduler/job/4702354

- Naresh