RFR: 8360048: NMT crash in gtest/NMTGtests.java: fatal error: NMT corruption: Block at 0x0000017748307120: header canary broken [v2]

[Afshin Zafari]

> The canary header test failed since there were concurrent `remove` and `free()` from the tree. The `remove` operations are synch'ed with corresponding NMT lock. The `ReserveMemory::reserve()` uses the same lock internally and is not included in the locked code block.
> 
> Tests: tier5 {macosx-aarch64, linux-x64, windows-x64} x {debug, release}

Afshin Zafari has updated the pull request incrementally with one additional commit since the last revision:

  local VMT vs static one.

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/25950/files
  - new: https://git.openjdk.org/jdk/pull/25950/files/461a00ed..51600cdd

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25950&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25950&range=00-01

  Stats: 141 lines in 5 files changed: 18 ins; 36 del; 87 mod
  Patch: https://git.openjdk.org/jdk/pull/25950.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25950/head:pull/25950

PR: https://git.openjdk.org/jdk/pull/25950