bugfix: trace collection with HANG problem (#4762)

* bugfix: trace collection may Hang(actually deadlock), while buffer.Lock wait buffer.RLook

* fix review: rename dummy struct for test

* fix review: rename struct with dummy key word which define in **_test.go

* fix review: simply Lock() instead of RLock()

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>