[Bug 249070] Using backtrace() from libexecinfo causes program to fail with "libunwind: EHHeaderParser::decodeTableEntry: bad fde: CIE ID is not zero"

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=249070

            Bug ID: 249070
           Summary: Using backtrace() from libexecinfo causes program to
                    fail with "libunwind:
                    EHHeaderParser::decodeTableEntry: bad fde: CIE ID is
                    not zero"
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: i386
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: nicholas.h.briggs at gmail.com

This basic program

#include <stdlib.h>
#include <execinfo.h>

int main(int argc, char *argv[])
{
  void *addrlist[20];
  int n;
  n = backtrace(&(addrlist[0]), 20);
  exit(n);
}

fails:

$ clang -o bt-clang bt.c -lexecinfo
$ ./bt-clang
libunwind: EHHeaderParser::decodeTableEntry: bad fde: CIE ID is not zero
$ ldd ./bt-clang
./bt-clang:
        libexecinfo.so.1 => /usr/lib/libexecinfo.so.1 (0x20443000)
        libc.so.7 => /lib/libc.so.7 (0x20447000)
        libelf.so.2 => /lib/libelf.so.2 (0x205d9000)
        libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x205f2000)
$ 

The results seem to be independent of the compiler used --
* gcc (FreeBSD Ports Collection) 9.3.0
* FreeBSD clang version 8.0.1 (tags/RELEASE_801/final 366581) (based on LLVM
8.0.1)
* clang version 12.0.0
  Target: i386-portbld-freebsd12.1

$ uname -a
FreeBSD flap 12.1-RELEASE-p8 FreeBSD 12.1-RELEASE-p8 GENERIC  i386

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