Sometime sampling data collector captured "redundant" threads which were not used in source code. Hot samples weren't dropped in corresponding user's modules, usually dropped in system or kernel modules. See more detail in this article
However the user may worry if these redundant threads will disturb their working threads, the simple way is to use Sampling Overtime View (SOT) to select all threads of the process and click "Display Over Time Info" button to generate "Threads Over Time" report
This report helps the user to understand redundant threads' workloads in time range. Usually redundant threads work during module loading, initialization, will not impact program's running.
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