[Bug rtl-optimization/119326] New: ICE: in connect_traces, at dwarf2cfi.cc:3086 with -O2 -m32 -fnon-call-exceptions -fharden-control-flow-redundancy -fstrub=internal

[zsojka at seznam dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119326

            Bug ID: 119326
           Summary: ICE: in connect_traces, at dwarf2cfi.cc:3086 with -O2
                    -m32 -fnon-call-exceptions
                    -fharden-control-flow-redundancy -fstrub=internal
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu

Created attachment 60791
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=60791&action=edit
reduced testcase

Compiler output:
$ x86_64-pc-linux-gnu-gcc -O2 -m32 -fnon-call-exceptions
-fharden-control-flow-redundancy -fstrub=internal testcase.c
during RTL pass: dwarf2
testcase.c: In function 'foo.strub.0':
testcase.c:18:1: internal compiler error: in connect_traces, at
dwarf2cfi.cc:3086
   18 | }
      | ^
0x2def3c1 internal_error(char const*, ...)
        /repo/gcc-trunk/gcc/diagnostic-global-context.cc:517
0xefbd65 fancy_abort(char const*, int, char const*)
        /repo/gcc-trunk/gcc/diagnostic.cc:1722
0x7a7c10 connect_traces
        /repo/gcc-trunk/gcc/dwarf2cfi.cc:3086
0x7a7c10 execute_dwarf2_frame
        /repo/gcc-trunk/gcc/dwarf2cfi.cc:3317
0x7a7c10 execute
        /repo/gcc-trunk/gcc/dwarf2cfi.cc:3798
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

$ x86_64-pc-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-amd64/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-20250317001648-r15-8081-ga3ead22b42de8d-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/15.0.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--disable-bootstrap --with-cloog --with-ppl --with-isl
--build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu
--target=x86_64-pc-linux-gnu --with-ld=/usr/bin/x86_64-pc-linux-gnu-ld
--with-as=/usr/bin/x86_64-pc-linux-gnu-as --enable-libsanitizer
--disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-20250317001648-r15-8081-ga3ead22b42de8d-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 15.0.1 20250317 (experimental) (GCC)