cf-natali opened a new pull request, #433:
URL: https://github.com/apache/mesos/pull/433
This test would randomly fail with:
```
18:16:59 3: F0501 17:16:59.192818 19175 slave.cpp:1445] Check failed:
state == DISCONNECTED || state == RUNNING || state == TERMINATING
RECOVERING
```
The cause was that the test re-starts the slave with the same PID, which
means that timers started by the previous slave process could fire while
the new slave process was running.
In this specific case, what happened is that the previous slave's ping
timer would fire in the middle of recovery of the second slave instance,
yielding this assertion.
Fixed by making sure to use `Clock::advance` and `Clock::settle` after
terminating the first instance to ensure that there are no pending
timers.
Tested by running the test in a loop, while running a CPU-intensive
workload - `stress-ng --cpu $(nproc)0` in parallel.
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