The "race-y" behavior is likely beneficial for the fuzzer's ability to find concurrency-related bugs around sessions. We should therefore enable the background refreshing of the logical session cache by explicitly setting mongod_options.set_parameters.disableLogicalSessionCacheRefresh=false in the following test suites:

• jstestfuzz.yml
• jstestfuzz_replication.yml
• jstestfuzz_replication_initsync.yml
• jstestfuzz_replication_resync.yml
• jstestfuzz_replication_session.yml
• jstestfuzz_sharded.yml
• jstestfuzz_sharded_causal_consistency.yml
• jstestfuzz_sharded_continuous_stepdown.yml
• jstestfuzz_sharded_session.yml

The following patch to the jstestfuzz_sharded.yml test suite would have immediately caught SERVER-33376 (as would running any sharding-related test suite that didn't require the use of the of the "refreshLogicalSessionCacheNow" command). Thanks to esha.maharishi for determining SERVER-33376 was missed due to how all MongoDB deployments started by both resmoke.py and the mongo shell specify --setParameter=disableLogicalSessionCacheRefresh=true.

diff --git a/buildscripts/resmokeconfig/suites/jstestfuzz_sharded.yml b/buildscripts/resmokeconfig/suites/jstestfuzz_sharded.yml
index 94b96613e2..7de220b60b 100644
--- a/buildscripts/resmokeconfig/suites/jstestfuzz_sharded.yml
+++ b/buildscripts/resmokeconfig/suites/jstestfuzz_sharded.yml
@@ -34,6 +34,7 @@ executor:
     mongod_options:
       set_parameters:
         enableTestCommands: 1
+        disableLogicalSessionCacheRefresh: false
         numInitialSyncAttempts: 1
         writePeriodicNoops: 1
       verbose: ''

# The LogicalSessionCache does automatic background refreshes in the server. This is
# race-y for tests, since tests trigger their own immediate refreshes instead. Turn off
# background refreshing for tests. Set in the .yml file to override this.
if "disableLogicalSessionCacheRefresh" not in suite_set_parameters:
    suite_set_parameters["disableLogicalSessionCacheRefresh"] = True

https://github.com/mongodb/mongo/blob/r3.6.2/buildscripts/resmokelib/core/programs.py#L48-L52
https://github.com/mongodb/mongo/blob/r3.6.2/src/mongo/shell/servers.js#L1059-L1060