Failed test: kernel.timer.timer_periodicity on nrf51/nrf52

[zephyrbot]

Test tests/kernel/timer/timer_api/kernel.timer failing on nrf51:

***** delaying boot 1000ms (per build configuration) *****
 ***** Booting Zephyr OS 1.12.99 (delayed boot 1000ms) *****
 Running test suite timer_api
 ===================================================================
 starting test - test_timer_duration_period
 PASS - test_timer_duration_period
 ===================================================================
 starting test - test_timer_period_0
 PASS - test_timer_period_0
 ===================================================================
 starting test - test_timer_expirefn_null
 PASS - test_timer_expirefn_null
 ===================================================================
 starting test - test_timer_periodicity

     Assertion failed at zephyr.git/tests/kernel/timer/timer_api/src/main.c:171: test_timer_periodicity: (((delta) >= (50)) && ((delta) <= (50) + (1))) is false

 FAIL - test_timer_periodicity
 ===================================================================
 starting test - test_timer_status_get
 PASS - test_timer_status_get
 ===================================================================
 starting test - test_timer_status_get_anytime
 PASS - test_timer_status_get_anytime
 ===================================================================
 starting test - test_timer_status_sync

     Assertion failed at zephyr.git/tests/kernel/timer/timer_api/src/main.c:53: duration_expire: k_uptime_delta(&tdata.timestamp) >= 50 is false

 ASSERTION FAIL [!(thread->base.user_options & (1 << 0))] @ zephyr.git/arch/arm/core/thread_abort.c:37:
 	essential thread aborted

[nashif]

also failed on nrf52840_pca10056

[spoorthik]

With the commit: 734eda3 subtest test_timer_period_0 is also failing on NRF51

Running test suite timer_api
===================================================================
starting test - test_timer_duration_period
PASS - test_timer_duration_period
===================================================================
starting test - test_timer_period_0

    Assertion failed at /home/kspoorth/work/latest_zephyr/tests/kernel/timer/timer_api/src/main.c:159: test_timer_period_0: tdata.expire_cnt == 1 is false

FAIL - test_timer_period_0
===================================================================
starting test - test_timer_expirefn_null
PASS - test_timer_expirefn_null
===================================================================
starting test - test_timer_periodicity

    Assertion failed at /home/kspoorth/work/latest_zephyr/tests/kernel/timer/timer_api/src/main.c:240: test_timer_periodicity: (((delta) >= (50)) && ((delta) <= (50) + (1))) is false

FAIL - test_timer_periodicity
===================================================================
starting test - test_timer_status_get
PASS - test_timer_status_get
===================================================================
starting test - test_timer_status_get_anytime

    Assertion failed at /home/kspoorth/work/latest_zephyr/tests/kernel/timer/timer_api/src/main.c:299: test_timer_status_get_anytime: k_timer_status_get(&timer) == 4 is false

FAIL - test_timer_status_get_anytime
===================================================================
starting test - test_timer_status_sync
PASS - test_timer_status_sync
===================================================================
starting test - test_timer_k_define
PASS - test_timer_k_define
===================================================================
starting test - test_timer_user_data
PASS - test_timer_user_data
===================================================================
===================================================================
PROJECT EXECUTION FAILED