This is a bug report for perl from zefram@fysh.org,
generated with the help of perlbug 1.44 running under perl 5.37.11.
-----------------------------------------------------------------
<!--[Please describe your issue here]-->
```
$ perl -lwe 'our sub foo; 0 if sub { eval "" if 0; \&foo if 0; }'
zsh: segmentation fault perl -lwe
```
Necessary elements to get this crash\: named sub declared with \"our\"
\(rather than \"my\" or \"state\" or as a package sub\)\; closure sub
\(either anonymous sub or \"my\" sub\)\; string eval use compiled inside
closure sub\; reference to the named sub compiled inside closure sub\;
closure constructed at runtime\. Non\-requirements\: string eval
doesn\'t need to execute\; reference to the named sub doesn\'t need to
execute\; order of the string eval and sub reference doesn\'t matter\;
closure doesn\'t need to be called\.
Adding \"\-Mfeature\=lexical\_subs\"\, this crash occurs all the way
back to Perl 5\.17\.4 when lexical subs were first introduced\.
<!--[Please do not change anything below this line]-->
<!------------------------------------------------------------------- -->
---
**Flags**
- category=core
- severity=medium
---
**Perl configuration**
```
This perlbug was built using Perl 5.32.1 - Fri Sep 24 16:10:58 UTC 2021
It is being executed now by Perl 5.37.11 - Thu Apr 20 22:41:57 BST 2023.
Site configuration information for perl 5.37.11:
Configured by zefram at Thu Apr 20 22:41:57 BST 2023.
Summary of my perl5 (revision 5 version 37 subversion 11) configuration:
Platform:
osname=linux
osvers=5.10.0-21-amd64
archname=x86_64-linux-thread-multi
uname='linux barba.rous.org 5.10.0-21-amd64 #1 smp debian 5.10.162-1 (2023-01-21) x86_64 gnulinux '
config_args='-des -Dprefix=/home/zefram/usr/perl/perl_install/perl-5.37.11-i64-f52 -Duselargefiles -Dusethreads -Uafs -Ud_csh -Uusesfio -Uusenm -Duseshrplib -Dusedevel -Uversiononly -Ui_db'
hint=recommended
useposix=true
d_sigaction=define
useithreads=define
usemultiplicity=define
use64bitint=define
use64bitall=define
uselongdouble=undef
usemymalloc=n
default_inc_excludes_dot=define
Compiler:
cc='cc'
ccflags ='-D_REENTRANT -D_GNU_SOURCE -fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -D_FORTIFY_SOURCE=2'
optimize='-O2'
cppflags='-D_REENTRANT -D_GNU_SOURCE -fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include'
ccversion=''
gccversion='10.2.1 20210110'
gccosandvers=''
intsize=4
longsize=8
ptrsize=8
doublesize=8
byteorder=12345678
doublekind=3
d_longlong=define
longlongsize=8
d_longdbl=define
longdblsize=16
longdblkind=3
ivtype='long'
ivsize=8
nvtype='double'
nvsize=8
Off_t='off_t'
lseeksize=8
alignbytes=8
prototype=define
Linker and Libraries:
ld='cc'
ldflags =' -fstack-protector-strong -L/usr/local/lib'
libpth=/usr/local/lib /usr/lib/x86_64-linux-gnu /usr/lib /lib/x86_64-linux-gnu /lib
libs=-lpthread -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc
perllibs=-lpthread -ldl -lm -lcrypt -lutil -lc
libc=libc-2.31.so
so=so
useshrplib=true
libperl=libperl.so
gnulibc_version='2.31'
Dynamic Linking:
dlsrc=dl_dlopen.xs
dlext=so
d_dlsymun=undef
ccdlflags='-Wl,-E -Wl,-rpath,/home/zefram/usr/perl/perl_install/perl-5.37.11-i64-f52/lib/5.37.11/x86_64-linux-thread-multi/CORE'
cccdlflags='-fPIC'
lddlflags='-shared -O2 -L/usr/local/lib -fstack-protector-strong'
---
@INC for perl 5.37.11:
/home/zefram/usr/perl/perl_install/perl-5.37.11-i64-f52/lib/site_perl/5.37.11/x86_64-linux-thread-multi
/home/zefram/usr/perl/perl_install/perl-5.37.11-i64-f52/lib/site_perl/5.37.11
/home/zefram/usr/perl/perl_install/perl-5.37.11-i64-f52/lib/5.37.11/x86_64-linux-thread-multi
/home/zefram/usr/perl/perl_install/perl-5.37.11-i64-f52/lib/5.37.11
---
Environment for perl 5.37.11:
HOME=/home/zefram
LANG (unset)
LANGUAGE (unset)
LD_LIBRARY_PATH (unset)
LOGDIR (unset)
PATH=/home/zefram/usr/perl/perl_install/perl-5.37.11-i64-f52/bin:/home/zefram/usr/perl/util:/home/zefram/pub/x86_64-unknown-linux-gnu/bin:/home/zefram/pub/common/bin:/usr/bin:/bin:/usr/local/bin:/usr/games
PERL_BADLANG (unset)
SHELL=/usr/bin/zsh
```
generated with the help of perlbug 1.44 running under perl 5.37.11.
-----------------------------------------------------------------
<!--[Please describe your issue here]-->
```
$ perl -lwe 'our sub foo; 0 if sub { eval "" if 0; \&foo if 0; }'
zsh: segmentation fault perl -lwe
```
Necessary elements to get this crash\: named sub declared with \"our\"
\(rather than \"my\" or \"state\" or as a package sub\)\; closure sub
\(either anonymous sub or \"my\" sub\)\; string eval use compiled inside
closure sub\; reference to the named sub compiled inside closure sub\;
closure constructed at runtime\. Non\-requirements\: string eval
doesn\'t need to execute\; reference to the named sub doesn\'t need to
execute\; order of the string eval and sub reference doesn\'t matter\;
closure doesn\'t need to be called\.
Adding \"\-Mfeature\=lexical\_subs\"\, this crash occurs all the way
back to Perl 5\.17\.4 when lexical subs were first introduced\.
<!--[Please do not change anything below this line]-->
<!------------------------------------------------------------------- -->
---
**Flags**
- category=core
- severity=medium
---
**Perl configuration**
```
This perlbug was built using Perl 5.32.1 - Fri Sep 24 16:10:58 UTC 2021
It is being executed now by Perl 5.37.11 - Thu Apr 20 22:41:57 BST 2023.
Site configuration information for perl 5.37.11:
Configured by zefram at Thu Apr 20 22:41:57 BST 2023.
Summary of my perl5 (revision 5 version 37 subversion 11) configuration:
Platform:
osname=linux
osvers=5.10.0-21-amd64
archname=x86_64-linux-thread-multi
uname='linux barba.rous.org 5.10.0-21-amd64 #1 smp debian 5.10.162-1 (2023-01-21) x86_64 gnulinux '
config_args='-des -Dprefix=/home/zefram/usr/perl/perl_install/perl-5.37.11-i64-f52 -Duselargefiles -Dusethreads -Uafs -Ud_csh -Uusesfio -Uusenm -Duseshrplib -Dusedevel -Uversiononly -Ui_db'
hint=recommended
useposix=true
d_sigaction=define
useithreads=define
usemultiplicity=define
use64bitint=define
use64bitall=define
uselongdouble=undef
usemymalloc=n
default_inc_excludes_dot=define
Compiler:
cc='cc'
ccflags ='-D_REENTRANT -D_GNU_SOURCE -fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -D_FORTIFY_SOURCE=2'
optimize='-O2'
cppflags='-D_REENTRANT -D_GNU_SOURCE -fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include'
ccversion=''
gccversion='10.2.1 20210110'
gccosandvers=''
intsize=4
longsize=8
ptrsize=8
doublesize=8
byteorder=12345678
doublekind=3
d_longlong=define
longlongsize=8
d_longdbl=define
longdblsize=16
longdblkind=3
ivtype='long'
ivsize=8
nvtype='double'
nvsize=8
Off_t='off_t'
lseeksize=8
alignbytes=8
prototype=define
Linker and Libraries:
ld='cc'
ldflags =' -fstack-protector-strong -L/usr/local/lib'
libpth=/usr/local/lib /usr/lib/x86_64-linux-gnu /usr/lib /lib/x86_64-linux-gnu /lib
libs=-lpthread -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc
perllibs=-lpthread -ldl -lm -lcrypt -lutil -lc
libc=libc-2.31.so
so=so
useshrplib=true
libperl=libperl.so
gnulibc_version='2.31'
Dynamic Linking:
dlsrc=dl_dlopen.xs
dlext=so
d_dlsymun=undef
ccdlflags='-Wl,-E -Wl,-rpath,/home/zefram/usr/perl/perl_install/perl-5.37.11-i64-f52/lib/5.37.11/x86_64-linux-thread-multi/CORE'
cccdlflags='-fPIC'
lddlflags='-shared -O2 -L/usr/local/lib -fstack-protector-strong'
---
@INC for perl 5.37.11:
/home/zefram/usr/perl/perl_install/perl-5.37.11-i64-f52/lib/site_perl/5.37.11/x86_64-linux-thread-multi
/home/zefram/usr/perl/perl_install/perl-5.37.11-i64-f52/lib/site_perl/5.37.11
/home/zefram/usr/perl/perl_install/perl-5.37.11-i64-f52/lib/5.37.11/x86_64-linux-thread-multi
/home/zefram/usr/perl/perl_install/perl-5.37.11-i64-f52/lib/5.37.11
---
Environment for perl 5.37.11:
HOME=/home/zefram
LANG (unset)
LANGUAGE (unset)
LD_LIBRARY_PATH (unset)
LOGDIR (unset)
PATH=/home/zefram/usr/perl/perl_install/perl-5.37.11-i64-f52/bin:/home/zefram/usr/perl/util:/home/zefram/pub/x86_64-unknown-linux-gnu/bin:/home/zefram/pub/common/bin:/usr/bin:/bin:/usr/local/bin:/usr/games
PERL_BADLANG (unset)
SHELL=/usr/bin/zsh
```