The $geoNear tests in currentop_query.js can fail due to the following:

• curentop_query.js always sets internalQueryExecYieldIterations: 1 so that the PlanExecutor will yield on every iteration.
• The test enables the setYieldAllLocksHang failpoint and runs a $geoNear aggregation.
• If the shard is stale, this will cause the ShardServerCatalogCacheLoader to query config.cache.collections for metadata, and the query yields.
• The ShardServerCatalogCacheLoader is now stuck until the setYieldAllLocksHang is released, and the $geoNear operation is blocked behind it.
• The system remains stuck in this state until the assert.soon on the $geoNear aggregation times out.