eddieran commented on PR #16195:
URL: https://github.com/apache/dubbo/pull/16195#issuecomment-4263771870

   Thanks @RainYuY — added the toggle. Users can restore the legacy 
`dumpAllThreads(true, true)` behaviour by setting:
   
   ```
   -Ddubbo.jstack-dump.locked-synchronizers=true
   ```
   
   Default remains `false` since, as discussed in #16194, that flag triggers a 
full-heap safepoint scan that can freeze the JVM for tens of seconds on ZGC + 
large heaps. The opt-in gives operators the escape hatch for the rare cases 
where they need the j.u.c.lock ownership info.
   
   cc @zrlw FYI — I kept the default-safe semantics, which matches the [OpenJDK 
JDK-8324066](https://bugs.openjdk.org/browse/JDK-8324066) precedent.


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