[Bug 234201] Regression in LLVM libunwind: Apache Tomcat web application crashes on 12.0 (but not on 11.2)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234201

--- Comment #7 from Dimitry Andric <dim at FreeBSD.org> ---
(In reply to Dave Baukus from comment #6)
> We are seeing this same issue on Release-12.0 in a large Java application;
> one of our Java developers created a small, standalone test that emits the
> libunwind error message and core dumps

If it is possible, it would be nice to attach the jar.


> The problem does NOT occur on FreeBSD-12.0-STABLE-amd64-20190517-r347885. Is
> anyone aware of a specific fix ?

12.0-RELEASE shipped with clang 6.0.1 and a fairly old version of
llvm-libunwind. While I updated llvm and clang a few times, I didn't handle
llvm-libunwind until the 8.0.0 import in base r346168.  There, I upgraded
llvm-libunwind to the same upstream revision as the rest of llvm and clang,
e.g. upstream 8.0.0 final r356365.

Unfortunately that is rather a huge commit, also for the libunwind part, so it
is not easy to pinpoint one exact upstream revision that fixes this particular
issue.

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