[survivedurcode]

I would check your answer. These are pauses due to time spent writing to diagnostic outputs. These are not traditional collection pauses. This affects both jstat as well as writes of GC logs. (I.e. GC log writes will block the app just the same way)

[pjmlp]

Which is why for anything serious one should be using Flight Recorder instead.

[funcDropShadow]

Or /tmp should be a tmpfs as it is on most current Linux distributions.