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From: "zhendong.su at inf dot ethz.ch" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/103231] New: ICE (nondeterministic) on valid
 code at -O1 on x86_64-linux-gnu: Segmentation fault
Date: Sun, 14 Nov 2021 10:31:17 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103231

            Bug ID: 103231
           Summary: ICE (nondeterministic) on valid code at -O1 on
                    x86_64-linux-gnu: Segmentation fault
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zhendong.su at inf dot ethz.ch
  Target Milestone: ---

Created attachment 51788
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D51788&action=3Dedit
reproducer

This one is flaky and very difficult to reduce (likely due to memory errors=
).
The reproducer is still quite large and hairy.

[658] % gcctk -v
Using built-in specs.
COLLECT_GCC=3Dgcctk
COLLECT_LTO_WRAPPER=3D/local/suz-local/software/local/gcc-trunk/libexec/gcc=
/x86_64-pc-linux-gnu/12.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-trunk/configure --disable-bootstrap
--prefix=3D/local/suz-local/software/local/gcc-trunk --enable-languages=3Dc=
,c++
--disable-werror --enable-multilib --with-system-zlib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 12.0.0 20211114 (experimental) [master r12-5239-ga8029add306] (=
GCC)=20
[659] %=20
[659] % gcctk -O0 -w small.c
[660] %=20
[660] % gcctk -O1 -w small.c
[661] % gcctk -O1 -w small.c
[662] % gcctk -O1 -w small.c
gcctk: internal compiler error: Segmentation fault signal terminated program
cc1
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.
[663] %=