[Bug 264065] java/openjdk8: Crashes on aarch64 when built with clang13: # Internal Error (assembler_aarch64.hpp:237) .. guarantee(val < (1U << nbits)) failed: Field too big for insn

From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 19 Sep 2022 14:45:28 UTC

--- Comment #31 from Dimitry Andric <dim@FreeBSD.org> ---
(In reply to Ronald Klop from comment #30)
> The tijmp failure I mentioned in comment #23 was build with this openjdk8:
> http://ampere2.nyi.freebsd.org/data/main-arm64-default/p23c196516a66_s45ad955714/logs/openjdk8-8.342.07.1.log
> That openjdk is build without bringing in llvm12.

Yes, I can see it in the log. It is building 8.342.07.1 with the system clang

> So did the fixes really go into this openjdk8?

Yes, I have verified that even before my changes, when 8.342.07.1 was
committed, the two fixes are applied in the upstream sources.

> Or why else do they not work?

The "build with clang 13" fix works, since it does build with clang >= 13 (in
this case, 14.0.5).

The "aarch64 assertion failure" fix does not seem to work, and that is the big
mystery. This fix came verbatim from openjdk8 upstream, but maybe it does not
cover all situations. It is hard to tell without access to a full aarch64
debugging environment and a reproduction case.

The upstream bug for this, https://bugs.openjdk.org/browse/JDK-8247766, does
have a bunch of duplicates, but most of them are for backports to older JDK

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