tests/kernel/sched/schedule_api/testcase.yaml#kernel.sched.unlock_preemptible fails on nrf52840_pca10056, sam_e70_xplained, nrf52_pca10040

[spoorthik]

Execution log:

Running test suite threads_scheduling
===================================================================
starting test PASS - test_priority_cooperative
===================================================================
starting test - test_priority_preemptible
PASS - test_priority_preemptible
===================================================================
starting test - test_yield_cooperative
PAS test_yield_cooperative
===================================================================
starting test - test_sleep_cooperative
PASS - test_sleep_cooperative
===================================================================
starting test - test- test_sleep_wakeup_preemptible
===================================================================
starting test - test_pending_thread_wakeup
PASS - test_pending_thread_wakeup
===================================================================
starting test - test_time_slicing_preemptible
PASS - test_time_slicing_preemptible
===================================================================
starting test - test_time_slicing_disable_preemptible
PASS - test_time_slicing_disable_preemptible
===================================================================
starting test - test_lock_preemptible
PASS - test_lock_preemptible
===================================================================
starting test - test_unlockmptible
***** MPU FAULT *****
  Data Access Violation
  MMFAR Address: 0x20005518
**** Unknown Fatal Error 2! ****
Current thread ID = 0x20000828
Faulting instruction address = 0x20a0
Fatal fault in thread 0x20000828! Aborting.
***** MPU FAULT *****
  Data Access Violation
  MMFAR Address: 0x20005518
***** Hardware exception *****
Current thread ID = 0x2000bb60
Faulting instruction address = 0x2064
Fatal fault in thread 0x2000bb60! Aborting.

Latest commit on which failure found: f3bc967

Steps to reproduce:

cd tests/kernel/sched/schedule_api
mkdir build && cd build
cmake -DBOARD=nrf52840_pca10056 ..
make flash

Platforms on which failure observed: nrf52840_pca10056, sam_e70_xplained, nrf52_pca10040