rtc test start failing constantly on Oracle ARM64 baremetal Standard.A1.160 since F-5.15.0-1016

The rtc test is working on F-5.15-oracle ARM64 baremetal Standard.A1.160, however it starts failing constantly since F-5.15.0-1016.

Test failed with:
 Running 'virt-what'
 Running './rtctest /dev/rtc0 64'

                        RTC Driver Test Example.

 ...Update IRQs not supported.

 Current RTC date/time is 26-8-2022, 10:50:28.
 Alarm time now set to 10:50:33.

 ...Alarm IRQs not supported.

 Periodic IRQ rate is 64Hz.
 Counting 20 interrupts at:
 2Hz: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
 4Hz: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
 8Hz: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
 16Hz: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
 32Hz: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
 64Hz: 1 2 3 4 5 6
 PIE delta error: 0.018223 should be close to 0.015625

Also I notice that the "Periodic IRQ rate" will be different in different attempts. Here is test results with different kernels.

F-5.15.0-1013:
  1. Periodic IRQ rate is 1Hz - GOOD
  2. Periodic IRQ rate is 64Hz - FAIL
  3. Periodic IRQ rate is 32Hz - GOOD
  4. Periodic IRQ rate is 64Hz - GOOD
  5. Periodic IRQ rate is 64Hz - GOOD
  6. Periodic IRQ rate is 64Hz - FAIL
  7. Periodic IRQ rate is 1Hz - FAIL
  8. Periodic IRQ rate is 32Hz - FAIL
  9. Periodic IRQ rate is 32Hz - GOOD
 10. Periodic IRQ rate is 64Hz - FAIL

F-5.15.0-1015:
  1. Periodic IRQ rate is 1Hz - GOOD
  2. Periodic IRQ rate is 64Hz - FAIL
  3. Periodic IRQ rate is 32Hz - FAIL
  4. Periodic IRQ rate is 64Hz - GOOD
  5. Periodic IRQ rate is 64Hz - GOOD
  6. Periodic IRQ rate is 64Hz - GOOD
  7. Periodic IRQ rate is 64Hz - FAIL
  8. Periodic IRQ rate is 16Hz - GOOD
  9. Periodic IRQ rate is 64Hz - GOOD
 10. Periodic IRQ rate is 64Hz - FAIL

F-5.15.0-1016
  1. Periodic IRQ rate is 1Hz - FAIL
  2. Periodic IRQ rate is 32Hz - FAIL
  3. Periodic IRQ rate is 32Hz - FAIL
  4. Periodic IRQ rate is 32Hz - FAIL
  5. Periodic IRQ rate is 64Hz - FAIL
  6. Periodic IRQ rate is 16Hz - FAIL
  7. Periodic IRQ rate is 32Hz - FAIL
  8. Periodic IRQ rate is 32Hz - FAIL
  9. Periodic IRQ rate is 32Hz - FAIL
 10. Periodic IRQ rate is 64Hz - FAIL