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From: "dcb314 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/105738] New: asan error during bootstrap
Date: Thu, 26 May 2022 09:59:17 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105738

            Bug ID: 105738
           Summary: asan error during bootstrap
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com
  Target Milestone: ---

I just got the following error during a bootstrap with asan enabled:

echo NO_PIE_CFLAGS =3D "$NO_PIE_CFLAGS" >> tmp-libgcc.mvars
mv tmp-libgcc.mvars libgcc.mvars
/bin/sh ../../trunk.git/gcc/../move-if-change tmp-fixinc_list fixinc_list
echo timestamp > s-fixinc_list
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D46366=3D=3DERROR: AddressSanitizer: unknown-crash on address 0x7fe50b=
b02c10 at pc
0x000002bb655b bp 0x7ffe2f90ce00 sp 0x7ffe2f90cdf8
READ of size 8 at 0x7fe50bb02c10 thread T0
    #0 0x2bb655a in NEXT_INSN(rtx_insn const*) ../../trunk.git/gcc/rtl.h:14=
77
    #1 0x2bb655a in expensive_function_p(int)
../../trunk.git/gcc/predict.cc:3702
    #2 0x3f57001 in ix86_compute_frame_layout
../../trunk.git/gcc/config/i386/i386.cc:6644
    #3 0x285d1c6 in update_reg_eliminate
../../trunk.git/gcc/lra-eliminations.cc:1132

This seems to happen late in stage 3:

$ egrep "^Config|^=3D=3D" mk.out
...
Configuring stage 3 in ./gcc
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D46366=3D=3DERROR: AddressSanitizer: unknown-crash on address 0x7fe50b=
b02c10 at pc
0x000002bb655b bp 0x7ffe2f90ce00 sp 0x7ffe2f90cdf8
=3D=3D46366=3D=3DABORTING

Configure line is

CC=3D"clang -Wall" CXX=3D"clang++ -Wall" \
../trunk.git/configure --prefix=3D/home/dcb/gcc/$PREFIX \
        --with-build-config=3Dbootstrap-ubsan \
        --with-build-config=3Dbootstrap-asan \
        --disable-multilib \
        --disable-werror \
        --enable-checking=3Ddf,extra,fold,rtl,yes \
        --enable-languages=3Dc,c++,fortran

sed 's/-O2/-O3 -march=3Dbdver2/' < Makefile > Makefile.tmp
mv Makefile.tmp Makefile=