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

[bugzilla-noreply at freebsd.org]

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

            Bug ID: 234201
           Summary: Regression in LLVM libunwind: Apache Tomcat web
                    application crashes on 12.0 (but not on 11.2)
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Keywords: crash, regression, toolchain
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: freebsd at mhka.no
                CC: emaste at freebsd.org

When the port devel/jakarta-commons-daemon is built with LLVM in base on
12.0-RELEASE (default configuration), our tomcat webapp "coffeehouse" fails
with the message "libunwind: getEncodedP
/usr/src/contrib/llvm/projects/libunwind/src/AddressSpace.hpp:280 - unknown
pointer encoding"

The offending section of code:
(...)
inline LocalAddressSpace::pint_t
LocalAddressSpace::getEncodedP(pint_t &addr, pint_t end, uint8_t encoding,
                               pint_t datarelBase) {
(...)
 switch (encoding & 0x0F) {
(...)
  default:
    _LIBUNWIND_ABORT("unknown pointer encoding");
(...)

This error does not occur when the port is built with GCC, nor when it's built
& run on 11.2 (it works fine with 11.2 world on top of 12.0 kernel).

We've applied a workaround internally which builds it with GCC, but think the
correct approach is to fix the regression in base, so that we won't pull in
GCC8 just for this.

The web application can be provided upon request.

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