RFR: 8274785: ciReplay: Potential crash due to uninitialized Compile::_ilt variable

[Vladimir Kozlov]

On Thu, 7 Oct 2021 14:52:57 GMT, Christian Hagedorn <chagedorn at openjdk.org> wrote:

> While working on JDK-8272912 and inserting `assert(false)` on various places for testing purposes, I noticed the following segmentation fault in one case:
> 
> The inline tree `Compile::_ilt` variable is not initialized directly by the initializer list but only later in `Compile::Compile()` when calling 
> 
> _ilt = InlineTree::build_inline_tree_root();
> 
> Before this assignment, `_ilt` can contain garbage (i.e. `!= NULL`). When hitting an assert or crash before returning from `build_inline_tree_root()`, replay compilation is trying to dump the inline tree and fails to notice that the inline tree is still uninitialized. This can result in a segmentation fault when accessing `_ilt`.
> 
> Thanks,
> Christian

Good.

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Marked as reviewed by kvn (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/5852