Occasionally, the alarm fires ~5minutes later than intended

[nyxkn]

Describe the bug

On some occasions, seemingly randomly, the alarm fires a few minutes late. This seems to be after a delay of ~5 minutes, as shown in the logs.

To Reproduce

Hard to reproduce as it just seems to happen randomly.

I only use the alarms to wake up, so I set my phone aside, sleep, and wait for the alarm.

The alarms always fire from a locked phone. Not sure if relevant but phone is always on airplane mode and dnd while I sleep.

I'm running the latest F-Droid build on Android 9.

Logs

The two logs below each contain many alarm firings. The last one in each of the files is the delayed one.

In the first log, I grabbed an existing alarm entry, and manually enabled it and set the alarm time roughly 30minutes away.

In the second log, it was an alarm entry which is always enabled on a daily repeat.

Curiously, in both cases the delay seems to be exactly 4m46s.

I think I might recall previous delayed alarms that were on a slightly shorter delay than the ~5m you see here, but I'm not sure anymore and don't have logs for those. I'll keep monitoring.

The logs don't seem to show much other than the fact that the alarm was delayed, but you might be able to read more into them than I can.

Of course let me know if there's anything else I can provide or any other way for me to better test this.

rolling-2022-03-03.log
rolling-2022-03-04.log

[nyxkn]

Here are some more logs of this happening. These confirm that the delay isn't actually always 5m, but a bit random. Here we have two delays of ~10m and one of ~5m.

The delayed alarm is always the last one in each log.

rolling-2022-03-09.log
rolling-2022-03-13.log
rolling-2022-03-27.log