[jdk13u-dev] RFR: 8212160: JVMTI agent crashes with "assert(_value != 0LL) failed: resolving NULL _value"

Mon Jan 25 11:42:03 UTC 2021

I'd like to backport 8212160 to 13u for parity with 11u.
The patch doesn't apply cleanly due to minor context differences in nmethod.cpp and serviceThread.cpp (JDK-8235273 and JDK-8170299 are not in 13u), reapplied manually.
Tested with tier1 and other jvmti tests.
Follow-up fixes JDK-8235456 and JDK-8236124 are planned to be backported as well.

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Commit messages:
 - Backport 8846a8043d1137ab1aeee3a4304d5fa02c9431ad

Changes: https://git.openjdk.java.net/jdk13u-dev/pull/87/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk13u-dev&pr=87&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8212160
  Stats: 330 lines in 15 files changed: 239 ins; 33 del; 58 mod
  Patch: https://git.openjdk.java.net/jdk13u-dev/pull/87.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk13u-dev pull/87/head:pull/87

PR: https://git.openjdk.java.net/jdk13u-dev/pull/87