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From: "volker.weissmann at gmx dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/107418] New: lto-dump -gimple-stats Segmentation Fault
Date: Wed, 26 Oct 2022 16:17:31 +0000
X-Bugzilla-Reason: CC
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: lto
X-Bugzilla-Version: 12.2.0
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: volker.weissmann at gmx dot de
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107418

            Bug ID: 107418
           Summary: lto-dump -gimple-stats Segmentation Fault
           Product: gcc
           Version: 12.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
          Assignee: unassigned at gcc dot gnu.org
          Reporter: volker.weissmann at gmx dot de
                CC: marxin at gcc dot gnu.org
  Target Milestone: ---

I don't understand what -gimple-stats does, but I don't think it should
segfault:

$ g++ bug.cpp -c -flto && lto-dump bug.o -gimple-stats
during IPA pass: modref
lto-dump: internal compiler error: Segmentation fault
0x1788bc4 internal_error(char const*, ...)
        ???:0
0x6e8ba3 cgraph_node::get_untransformed_body()
        ???:0
0x67ebd7 lto_main()
        ???:0
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://bugs.archlinux.org/> for instructions.

bug.cpp:
class MyClass  {
  public:
  MyClass(){}
};
void func() {
  new MyClass();
}

I used the gcc from the Archlinux repository:
$ g++ -v=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
Using built-in specs.
COLLECT_GCC=3Dg++
COLLECT_LTO_WRAPPER=3D/usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /build/gcc/src/gcc/configure
--enable-languages=3Dc,c++,ada,fortran,go,lto,objc,obj-c++,d --enable-boots=
trap
--prefix=3D/usr --libdir=3D/usr/lib --libexecdir=3D/usr/lib --mandir=3D/usr=
/share/man
--infodir=3D/usr/share/info --with-bugurl=3Dhttps://bugs.archlinux.org/
--with-build-config=3Dbootstrap-lto --with-linker-hash-style=3Dgnu
--with-system-zlib --enable-__cxa_atexit --enable-cet=3Dauto
--enable-checking=3Drelease --enable-clocale=3Dgnu --enable-default-pie
--enable-default-ssp --enable-gnu-indirect-function --enable-gnu-unique-obj=
ect
--enable-libstdcxx-backtrace --enable-link-serialization=3D1
--enable-linker-build-id --enable-lto --enable-multilib --enable-plugin
--enable-shared --enable-threads=3Dposix --disable-libssp --disable-libstdc=
xx-pch
--disable-werror
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 12.2.0 (GCC)=20

If I build gcc myself, I get a backtrace with line numbers:
$ g++ bug.cpp -c -flto && lto-dump bug.o -gimple-stats=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
/home/volker/Documents/localgcc/../gcc/gcc/cgraph.cc:4001:23: runtime error:
member access within null pointer of type 'struct lto_in_decl_state'
during IPA pass: modref
lto-dump: internal compiler error: Segmentation fault
0x2e693dd crash_signal
        /home/volker/Documents/localgcc/../gcc/gcc/toplev.cc:314
0x10203df cgraph_node::get_untransformed_body()
        /home/volker/Documents/localgcc/../gcc/gcc/cgraph.cc:4001
0xbd1cee lto_main()
        /home/volker/Documents/localgcc/../gcc/gcc/lto/lto-dump.cc:350
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.

Self-build-gcc:
$ g++ -v=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
Using built-in specs.
COLLECT_GCC=3Dg++
COLLECT_LTO_WRAPPER=3D/home/volker/Documents/myroot/libexec/gcc/x86_64-pc-l=
inux-gnu/13.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /home/volker/Documents/localgcc/../gcc/configure
--enable-checking --disable-bootstrap --prefix=3D/home/volker/Documents/myr=
oot
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 13.0.0 20221023 (experimental) (GCC)=