[jdk11u-dev] RFR: 8322511: JfrCheckpointThreadClosure::do_thread crashes when fetching thread_id [v4]

[Jiawei Tang]

> Threads which are in the state of `is_attaching_via_jni` may have the NULL object as their `_threadObj` . 
> So the JVM will crash when calling `JfrCheckpointThreadClosure::do_thread()`.

Jiawei Tang has updated the pull request incrementally with one additional commit since the last revision:

  Update full name

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Changes:
  - all: https://git.openjdk.org/jdk11u-dev/pull/2413/files
  - new: https://git.openjdk.org/jdk11u-dev/pull/2413/files/0cc754ad..0c58a66f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2413&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2413&range=02-03

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2413.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2413/head:pull/2413

PR: https://git.openjdk.org/jdk11u-dev/pull/2413