[CI/CD Failure Triage: dbModesTest] Unit Tests : db_modes_test : Terminated

[NorseGaud]

Results from the EOSIO CI/CD failure bucketing indicate the following test is having problems:

Platforms this is shown on:
macOS 10.15
macOS 10.14

Details:

https://buildkite.com/EOSIO/eosio/builds/20759#bcc9661c-97ee-4aa5-af9e-32a04755df7f
https://buildkite.com/EOSIO/eosio/builds/20819#a4c1efa8-8854-475e-9afb-6f8aad21d279
https://buildkite.com/EOSIO/eosio/builds/20873#ac2eaa23-528b-43c9-91fd-5b3d79aa3adc

52/82 Test #97: db_modes_test ......................................***Failed 40.71 sec

  | /Users/anka/eos/build/tests/db_modes_test.sh: line 45: 2914 Terminated: 15 ( sleep 20; kill -ALRM $MYPID )
  | /Users/anka/eos/build/tests/db_modes_test.sh: line 50: 2968 Terminated: 15 $NODEOS_LAUNCH_PARAMS --http-server-address '' --p2p-listen-endpoint '' "$@" 2> /dev/null

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[allenhan2]

Tried on both develop and release/2.0.x branches on MacOS10.15.5 (my local desktop) , see test passed on both branch. testing on MacOS10.14 now.

[allenhan2]

it could be fixed by this issue.
#7728