[jdk21u-dev] RFR: 8333887: ubsan: unsafe.cpp:247:13: runtime error: store to null pointer of type 'volatile int' [v4]

[luwang1103]

> hi @shipilev ,
> 
> This pull request contains a backport of commit [0d3a3771](https://git.openjdk.org/jdk/commit/0d3a3771c3777d3dd1fec8dc8faed5fd02b06830) from the [master](https://github.com/openjdk/jdk) repository.
> 
> The commit being backported was authored by Matthias Baesken on 13 Jun 2024.
> 
> Thanks！

luwang1103 has updated the pull request incrementally with one additional commit since the last revision:

  Backport 0d3a3771c3777d3dd1fec8dc8faed5fd02b06830

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

Changes:
  - all: https://git.openjdk.org/jdk21u-dev/pull/837/files
  - new: https://git.openjdk.org/jdk21u-dev/pull/837/files/6794dd26..771502b4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=837&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=837&range=02-03

  Stats: 5 lines in 1 file changed: 0 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/837.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/837/head:pull/837

PR: https://git.openjdk.org/jdk21u-dev/pull/837