[jdk21u-dev] RFR: 8327114: Attach in Linux may have wrong behaviour when pid == ns_pid (Kubernetes debug container) [v2]

[Goetz Lindenmaier]

> I backport this for parity with 21.0.11-oracle.
> 
> Clean backport, but needed to adapt syntax.

Goetz Lindenmaier has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - Merge branch 'openjdk:master' into goetz_backport_8327114
 - fix build
 - backport 52ba72823be0c969ab873ead2863ec48f883210b

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

Changes:
  - all: https://git.openjdk.org/jdk21u-dev/pull/2523/files
  - new: https://git.openjdk.org/jdk21u-dev/pull/2523/files/3c4fee42..712161c6

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2523&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2523&range=00-01

  Stats: 3109 lines in 10 files changed: 117 ins; 2907 del; 85 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2523.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2523/head:pull/2523

PR: https://git.openjdk.org/jdk21u-dev/pull/2523