[jdk11u-dev] RFR: 8315380: AsyncGetCallTrace crash in frame::safe_for_sender

[Jaroslav Bachorík]

Hello,

JBS: https://bugs.openjdk.org/browse/JDK-8315380
PR  : https://github.com/openjdk/jdk11u-dev/pull/3003

Could you please review this JDK 11 specific bug fix?

The change addresses an issue in frame_aarch64.cpp, within the
safe_for_sender function. The existing code
```
bool unextended_sp_safe = unextended_sp < thread->stack_base();
```
checks only one unsafe scenario. It does not consider the case where the
unextended_sp falls within the stack space.

The proposed change
```
bool unextended_sp_safe = (unextended_sp < thread->stack_base() &&
sp >= thread->stack_base() - thread->stack_size());
```
ensures that the behavior aligns with JDK 15+ (since JDK-8238988), where
the unextended_sp is checked against the stack limits.

Unfortunately, I couldn't create a reliable JTReg test to trigger this
issue. However, I ran existing tier1-tier4 tests on a linux-aarch64 system
and observed no new failures.

The same change would apply to jdk8u-dev where I plan to backport it once
this PR is merged.


Cheers,
Jaroslav Bachorík
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