commit 72f16f68973bf7d2ce5c621539a21fc4eccfa56e
author Charles-Francois Natali <cf.natali@gmail.com> Sat Jun 26 19:04:33 2021 +0100
committer bmahler <benjamin.mahler@gmail.com> Tue Jun 29 14:16:53 2021 -0400
tree 0022340c750e403d8372b107c0c4df4c9e62d327
parent 1b445c392a25e6c556acbf2bd8ed5214250ddace

Fixed a bug where timers wouldn't expire after `process:reinitialize`.

Pending `ticks` are used by `scheduleTick` to decide whether to schedule
an event loop tick when a new timer is scheduled - since we only need to
schedule the event loop tick if the new timer is supposed to expire
earlier than the current earliest timer.
Unfortunately `Clock::finalize` didn't clear `ticks`, which means that
the following could happen:
- schedule a timer T0 for expiration at time t0
- call `process::reinitalize`, which calls `Clock::finalize` but doesn't
  clear `ticks`
- schedule a new timer T1 for expiration at time t1 > t0: since
  `scheduleTick` would see that there was already the earlier pending
  tick for T0 in `ticks` with t0 < t1, it wouldn't actually schedule a
  tick of the event loop

Therefore new timers would never fire again.

This caused e.g.
`DockerContainerizerIPv6Test.ROOT_DOCKER_LaunchIPv6HostNetwork` test to
hang since it called `process::reinitialized` while having some active
timers - e.g. the reaper periodic timer.

Also added a test specifically for this bug.