https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124656
Bug ID: 124656
Summary: [16 Regression] [UBSAN] check.cc:4100:13: runtime
error
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: dcb314 at hotmail dot com
Target Milestone: ---
The following much reduced F90 program seems to cause trouble
with UBSAN on ARM 32:
a=max(i8y,A2=i8z)
end
$ ~/gcc/results/bin/gfortran -c -w three.f90
../../trunk/gcc/fortran/check.cc:4100:13: runtime error: store to address
0xffd3c124 with insufficient space for an object of type 'int'
0xffd3c124: note: pointer points here
7c 32 bc 06 00 85 c8 05 00 00 00 00 01 00 00 00 a4 c1 d3 ff 00 00 00 00 04
00 00 00 01 00 00 00
^
#0 0x00376708 in min_max_args ../../trunk/gcc/fortran/check.cc:4100
gfortran 15.2.0 seems happy with it:
$ ~/gcc/results.15.2.0/bin/gfortran -c -w three.f90
$
The problem first seems to occur sometime between date
20260305 (g:ee8ca6c927ec949a) and 20260309 (g:ee8ca6c927ec949a).
Compiler is
$ /home/dcb/gcc/results/bin/gfortran -v
Using built-in specs.
COLLECT_GCC=/home/dcb/gcc/results/bin/gfortran
COLLECT_LTO_WRAPPER=/home/dcb/gcc/results.20260324.ubsan/libexec/gcc/arm-linux-gnueabihf/16.0.1/lto-wrapper
Target: arm-linux-gnueabihf
Configured with: ../trunk/configure
--prefix=/home/dcb/gcc/results.20260324.ubsan --disable-doc --disable-multilib
--with-build-config=bootstrap-ubsan --with-pkgversion=c4fe97077571e183
--enable-checking=yes --enable-languages=c,c++,fortran --with-cpu=cortex-a76
--with-fpu=neon-fp-armv8 --with-float=hard --build=arm-linux-gnueabihf
--host=arm-linux-gnueabihf --target=arm-linux-gnueabihf
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 16.0.1 20260324 (experimental) (c4fe97077571e183)
$
