8315380: AsyncGetCallTrace crash in frame::safe_for_sender

[jbachorik]

This change is fixing the problem in frame_aarch64.cpp, function safe_for_sender, where we have this code

bool unextended_sp_safe = unextended_sp < thread->stack_base();

While this captures one possibility of not being safe, it omits the check for unextended_sp falling within the stack space.

The proposed change then is

bool unextended_sp_safe = (unextended_sp < thread->stack_base() && \
                             sp >= thread->stack_base() - thread->stack_size());

This is actually just making sure the behaviour is the same as in JDK 15+ (since JDK-8238988) where the unextended_sp is checked for being within the stack limits.

The change is not accompanied by a JTReg test because I was not able to craft one triggering the issue reliably.

Existing tests from tier1-tier4 were run on a linux-aarch64 system with no new failures observed.

---

Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8315380 needs maintainer approval

Issue

• JDK-8315380: AsyncGetCallTrace crash in frame::safe_for_sender (Bug - P4)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk11u-dev.git pull/3003/head:pull/3003
$ git checkout pull/3003

Update a local copy of the PR:
$ git checkout pull/3003
$ git pull https://git.openjdk.org/jdk11u-dev.git pull/3003/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 3003

View PR using the GUI difftool:
$ git pr show -t 3003

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk11u-dev/pull/3003.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back jbachorik! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[mlbridge]

Webrevs

• 00: Full (3a89bf64)