Commits on Jun 8, 2022

1. tests: Deflake test_migrating_consume_offsets …

   Fixes synchronization around failure injection and
   node restarts.
   
   The test is structured as follows.
   
   1. start a cluster without consumer_offsets support
   2. Run an async failure injection loop that can potentially do a SIGKILL
   on a random redpanda process.
   3. Do a consumer groups test on a sample topic.
   4. Restart the cluster to enable the new __consumer_offsets topic
   feature.
   5. Verify that __consumer_offsets functionality works as expected.
   
   It turns out that (2) and (4) are conflicting with each other due to
   poor synchronization. Due to some racy code these operations are
   interleaved resulting in failure injector attempting to kill a
   non-existent PID.
   
   This patch makes sure that only one of these two operations run at any
   given time. A given node is marked 'busy' in a thread-safe way if either
   of the operations is running and the other thread has to wait.

   

   bharathv committed Jun 8, 2022
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