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bug#70474: Just adding DMB doesn't help

From: Tony Garnock-Jones
Subject: bug#70474: Just adding DMB doesn't help
Date: Mon, 22 Apr 2024 09:52:47 +0200

As an alternative to changing the JIT to produce SWPAL/CASAL, because I wasn't sure if *all* aarch64 targets support these, I tried adding DMB ISH or DMB SY to the end of the generated code sequences. Surprisingly, this did not fix the issue! So there's perhaps something fishy about the LDAXR-STLXR sequences themselves?

So for now I'll stick on my own machine with SWPAL/CASAL, since this does seem to work well enough to let both my own code and fibers run.


Attachment: add-dmb-does-not-help.patch
Description: Text document

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