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From: "patrick at rivosinc dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/111428] New: RISC-V vector: Flaky segfault in
 {min|max}val_char_{1|2}.f90
Date: Fri, 15 Sep 2023 20:26:51 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111428

            Bug ID: 111428
           Summary: RISC-V vector: Flaky segfault in
                    {min|max}val_char_{1|2}.f90
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: patrick at rivosinc dot com
  Target Milestone: ---

Created attachment 55906
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D55906&action=3Dedit
Excerpt from the debug log

Failures:
FAIL: gfortran.dg/minval_char_1.f90   -O3 -g  execution test
FAIL: gfortran.dg/minval_char_1.f90   -O3 -fomit-frame-pointer -funroll-loo=
ps
-fpeel-loops -ftracer -finline-functions  execution test
FAIL: gfortran.dg/minval_char_2.f90   -O3 -g  execution test
FAIL: gfortran.dg/minval_char_2.f90   -O3 -fomit-frame-pointer -funroll-loo=
ps
-fpeel-loops -ftracer -finline-functions  execution test

FAIL: gfortran.dg/maxval_char_1.f90   -O3 -g  execution test
FAIL: gfortran.dg/maxval_char_1.f90   -O3 -fomit-frame-pointer -funroll-loo=
ps
-fpeel-loops -ftracer -finline-functions  execution test
FAIL: gfortran.dg/maxval_char_2.f90   -O3 -g  execution test
FAIL: gfortran.dg/maxval_char_2.f90   -O3 -fomit-frame-pointer -funroll-loo=
ps
-fpeel-loops -ftracer -finline-functions  execution test

Observed on:
rv64gcv_zvbb_zvbc_zvkg_zvkn_zvknc_zvkned_zvkng_zvknha_zvknhb_zvks_zvksc_zvk=
sed_zvksg_zvksh_zvkt-lp64d
rv64gcv-lp64d
rv64imafdcv_zicond_zawrs_zbc_zvkng_zvksg_zvbb_zvbc_zicsr_zba_zbb_zbs_zicbom=
_zicbop_zicboz_zfhmin_zkt-lp64d

Seems to only occur on rv64 glibc targets with the v extension enabled.

Known to pass: r14-3834-gd05aac047e0
Known to fail: r14-3840-g88a0a883960

Replicated locally using
https://github.com/patrick-rivos/riscv-gnu-toolchain/tree/29d071a8eec4603ff=
5fe4fe21d7e4ffa24f705f0
git submodule update --init gcc
cd gcc && git checkout 316d57da5bb9205b946afc56d78582fee874e4b5
cd .. && mkdir build && cd build
../configure --prefix=3D$(pwd) --with-arch=3Drv64gcv --with-abi=3Dlp64
make report-linux -j32

There was previously flaky behavior with these testcases, but it's been
resolved for other targets:
https://gcc.gnu.org/legacy-ml/gcc-patches/2017-12/msg00807.html
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D83379=