RFR: 8338478: [macos] Crash in CoreText with certain strings using JDK 22 or later

[Kevin Rushforth]

On Sat, 17 Aug 2024 21:02:59 GMT, Phil Race <prr at openjdk.org> wrote:

> The test in the bug report crashes reliably with JDK 22 on retina.
> It coincides with an update to the macOS compilers which seem likely to eagerly invalidate the target of a CFRelease on the native CTFontRef.
> Adding a ReachabilityFence to prevent the GC from collecting CTFontStrike until after the method has finished using the native fontRef from the strike fixes it.
> The same pattern is observed in 3 other methods (although no crash)  and a fence is added there too.
> 
> There is an existing test, which is how this problem was found.

Reviewers: @kevinrushforth @arapte

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PR Comment: https://git.openjdk.org/jfx/pull/1537#issuecomment-2296611621