8065895: Synchronous signals during error reporting may terminate or hang VM process

[zhengyu123]

I would like to backport this patch to openjdk8u for parity with Oracle
8u321.

Bug: https://bugs.openjdk.java.net/browse/JDK-8065895
jdk9 patch: http://hg.openjdk.java.net/jdk9/jdk9/hotspot/rev/6bfc40057b3f

jdk9 patch does not apply cleanly. There is only one conflict in
debug.cpp, due to line shifts.

Original cod review thread: https://mail.openjdk.java.net/pipermail/jdk8u-dev/2021-July/014133.html
and it has been reviewed by the author @Stuefe (not a jdk8u reviewer)

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Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• Change must be properly reviewed

Issue

• JDK-8065895: Synchronous signals during error reporting may terminate or hang VM process ⚠️ Issue is not open.

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.java.net/jdk8u-dev pull/39/head:pull/39
$ git checkout pull/39

Update a local copy of the PR:
$ git checkout pull/39
$ git pull https://git.openjdk.java.net/jdk8u-dev pull/39/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 39

View PR using the GUI difftool:
$ git pr show -t 39

Using diff file

Download this PR as a diff file:
https://git.openjdk.java.net/jdk8u-dev/pull/39.diff

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Webrevs

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