> I've reproduced this on 3.7.1rc1: (...)

Oh. I reopen the issue.

It seems like the bug occurred on the debug build of Python:

+ /builddir/build/BUILD/Python-3.7.1rc1/build/debug/python -m test.regrtest -wW --slowest --findleaks -x test_distutils -x test_bdist_rpm


Extract of commands to build Python in debug mode:



+ topdir=/builddir/build/BUILD/Python-3.7.1rc1
+ export 'CFLAGS=-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -D_GNU_SOURCE -fPIC -fwrapv'
+ CFLAGS='-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -D_GNU_SOURCE -fPIC -fwrapv'
+ export 'CXXFLAGS=-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -D_GNU_SOURCE -fPIC -fwrapv'
+ CXXFLAGS='-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -D_GNU_SOURCE -fPIC -fwrapv'
++ pkg-config --cflags-only-I libffi
+ export CPPFLAGS=
+ CPPFLAGS=
+ export 'OPT=-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -D_GNU_SOURCE -fPIC -fwrapv'
+ OPT='-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -D_GNU_SOURCE -fPIC -fwrapv'
+ export LINKCC=gcc
+ LINKCC=gcc
++ pkg-config --cflags openssl
+ export 'CFLAGS=-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -D_GNU_SOURCE -fPIC -fwrapv '
+ CFLAGS='-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -D_GNU_SOURCE -fPIC -fwrapv '
++ pkg-config --libs-only-L openssl
+ export 'LDFLAGS=-Wl,-z,relro -Wl,--as-needed  -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld -g '
+ LDFLAGS='-Wl,-z,relro -Wl,--as-needed  -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld -g '
+ BuildPython debug '--without-ensurepip --with-pydebug' -O0
STARTING: BUILD OF PYTHON FOR CONFIGURATION: debug
+ ConfName=debug
+ ExtraConfigArgs='--without-ensurepip --with-pydebug'
+ MoreCFlags=-O0
+ ConfDir=build/debug
+ echo STARTING: BUILD OF PYTHON FOR CONFIGURATION: debug
+ mkdir -p build/debug
+ pushd build/debug
~/build/BUILD/Python-3.7.1rc1/build/debug ~/build/BUILD/Python-3.7.1rc1
+ CFLAGS='-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -D_GNU_SOURCE -fPIC -fwrapv '
+ export CFLAGS
+ CXXFLAGS='-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -D_GNU_SOURCE -fPIC -fwrapv'
+ export CXXFLAGS
+ FFLAGS='-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -I/usr/lib64/gfortran/modules'
+ export FFLAGS
+ FCFLAGS='-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -I/usr/lib64/gfortran/modules'
+ export FCFLAGS
+ LDFLAGS='-Wl,-z,relro -Wl,--as-needed  -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld -g '
+ export LDFLAGS
+ '[' 1 = 1 ']'
+++ dirname /builddir/build/BUILD/Python-3.7.1rc1/configure
++ find /builddir/build/BUILD/Python-3.7.1rc1 -name config.guess -o -name config.sub
+ for i in $(find $(dirname $topdir/configure) -name config.guess -o -name config.sub)
++ basename /builddir/build/BUILD/Python-3.7.1rc1/config.guess
+ '[' -f /usr/lib/rpm/redhat/config.guess ']'
+ /usr/bin/rm -f /builddir/build/BUILD/Python-3.7.1rc1/config.guess
++ basename /builddir/build/BUILD/Python-3.7.1rc1/config.guess
+ /usr/bin/cp -fv /usr/lib/rpm/redhat/config.guess /builddir/build/BUILD/Python-3.7.1rc1/config.guess
'/usr/lib/rpm/redhat/config.guess' -> '/builddir/build/BUILD/Python-3.7.1rc1/config.guess'
+ for i in $(find $(dirname $topdir/configure) -name config.guess -o -name config.sub)
++ basename /builddir/build/BUILD/Python-3.7.1rc1/config.sub
+ '[' -f /usr/lib/rpm/redhat/config.sub ']'
+ /usr/bin/rm -f /builddir/build/BUILD/Python-3.7.1rc1/config.sub
++ basename /builddir/build/BUILD/Python-3.7.1rc1/config.sub
+ /usr/bin/cp -fv /usr/lib/rpm/redhat/config.sub /builddir/build/BUILD/Python-3.7.1rc1/config.sub
'/usr/lib/rpm/redhat/config.sub' -> '/builddir/build/BUILD/Python-3.7.1rc1/config.sub'
+ '[' 1 = 1 ']'
+ '[' x '!=' 'x-Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld' ']'
++ find . -name ltmain.sh
+ /builddir/build/BUILD/Python-3.7.1rc1/configure --build=x86_64-redhat-linux-gnu --host=x86_64-redhat-linux-gnu --program-prefix= --disable-dependency-tracking --prefix=/usr --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc --datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib64 --libexecdir=/usr/libexec --localstatedir=/var --sharedstatedir=/var/lib --mandir=/usr/share/man --infodir=/usr/share/info --enable-ipv6 --enable-shared --with-computed-gotos=yes --with-dbmliborder=gdbm:ndbm:bdb --with-system-expat --with-system-ffi --enable-loadable-sqlite-extensions --with-dtrace --with-lto --with-ssl-default-suites=openssl --with-valgrind --without-ensurepip --with-pydebug