"loadable library and perl binaries are mismatched" not informative

[p5pRT]

Migrated from rt.perl.org#130718 (status was 'open')

Searchable as RT130718$

[p5pRT]

From frederik@ofb.net

Created by frederik@ofb.net

I have a number of modules which I've installed via 'cpanm'. Sometimes
when I upgrade Perl I get an error message like this​:

  $ some-script-of-mine
  XS.c​: loadable library and perl binaries are mismatched (got handshake key 0x7ec0080, needed 0x7f00080)

This message would be more helpful to me if it specified the module
which is being loaded when the message is generated.

Perl Info

Flags:
    category=core
    severity=low

Site configuration information for perl 5.24.0:

Configured by builduser at Thu Sep  8 16:15:56 CEST 2016.

Summary of my perl5 (revision 5 version 24 subversion 0) configuration:
   
  Platform:
    osname=linux, osvers=4.7.3-1-arch, archname=i686-linux-thread-multi
    uname='linux flo-32 4.7.3-1-arch #1 smp preempt wed sep 7 17:57:38 cest 2016 i686 gnulinux '
    config_args='-des -Dusethreads -Duseshrplib -Doptimize=-march=i686 -mtune=generic -O2 -pipe -fstack-protector-strong -Dprefix=/usr -Dvendorprefix=/usr -Dprivlib=/usr/share/perl5/core_perl -Darchlib=/usr/lib/perl5/core_perl -Dsitelib=/usr/share/perl5/site_perl -Dsitearch=/usr/lib/perl5/site_perl -Dvendorlib=/usr/share/perl5/vendor_perl -Dvendorarch=/usr/lib/perl5/vendor_perl -Dscriptdir=/usr/bin/core_perl -Dsitescript=/usr/bin/site_perl -Dvendorscript=/usr/bin/vendor_perl -Dinc_version_list=none -Dman1ext=1perl -Dman3ext=3perl -Dlddlflags=-shared -Wl,-O1,--sort-common,--as-needed,-z,relro -Dldflags=-Wl,-O1,--sort-common,--as-needed,-z,relro'
    hint=recommended, useposix=true, d_sigaction=define
    useithreads=define, usemultiplicity=define
    use64bitint=undef, use64bitall=undef, uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  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',
    optimize='-march=i686 -mtune=generic -O2 -pipe -fstack-protector-strong',
    cppflags='-D_REENTRANT -D_GNU_SOURCE -fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include'
    ccversion='', gccversion='6.1.1 20160802', gccosandvers=''
    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234, doublekind=3
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12, longdblkind=3
    ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
    alignbytes=4, prototype=define
  Linker and Libraries:
    ld='cc', ldflags ='-Wl,-O1,--sort-common,--as-needed,-z,relro -fstack-protector-strong -L/usr/local/lib'
    libpth=/usr/local/lib /usr/lib/gcc/i686-pc-linux-gnu/6.1.1/include-fixed /usr/lib /lib
    libs=-lpthread -lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc -lgdbm_compat
    perllibs=-lpthread -lnsl -ldl -lm -lcrypt -lutil -lc
    libc=libc-2.24.so, so=so, useshrplib=true, libperl=libperl.so
    gnulibc_version='2.24'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E -Wl,-rpath,/usr/lib/perl5/core_perl/CORE'
    cccdlflags='-fPIC', lddlflags='-shared -Wl,-O1,--sort-common,--as-needed,-z,relro -L/usr/local/lib -fstack-protector-strong'



@INC for perl 5.24.0:
    /home/frederik/scripts-misc/perl
    /home/frederik/.local/lib/perl5/i686-linux-thread-multi
    /home/frederik/.local/lib/perl5
    /usr/lib/perl5/site_perl
    /usr/share/perl5/site_perl
    /usr/lib/perl5/vendor_perl
    /usr/share/perl5/vendor_perl
    /usr/lib/perl5/core_perl
    /usr/share/perl5/core_perl
    .


Environment for perl 5.24.0:
    HOME=/home/frederik
    LANG=en_US.UTF-8
    LANGUAGE (unset)
    LD_LIBRARY_PATH=/home/frederik/.local/arch/i386/lib:/home/frederik/.local/lib:/usr/local/lib
    LOGDIR (unset)
    PATH=/home/frederik/.local/bin:/home/frederik/scripts-misc:/home/frederik/.local/arch/i386/bin:/usr/bin/core_perl:/usr/bin/vendor_perl:/usr/bin/site_perl:/usr/local/bin:/usr/local/sbin:/usr/bin
    PERL5LIB=/home/frederik/scripts-misc/perl:/home/frederik/.local/lib/perl5:
    PERL_BADLANG (unset)
    PERL_LOCAL_LIB_ROOT=/home/frederik/.local/:/home/frederik/.local/
    PERL_MB_OPT=--install_base "/home/frederik/.local/"
    PERL_MM_OPT=INSTALL_BASE=/home/frederik/.local/
    SHELL=/bin/zsh

[p5pRT]

From @jkeenan

On Sat, 04 Feb 2017 23​:08​:09 GMT, frederik@​ofb.net wrote​:

This is a bug report for perl from frederik@​ofb.net,
generated with the help of perlbug 1.40 running under perl 5.24.0.

-----------------------------------------------------------------
[Please describe your issue here]

I have a number of modules which I've installed via 'cpanm'. Sometimes
when I upgrade Perl I get an error message like this​:

$ some-script-of-mine
XS.c​: loadable library and perl binaries are mismatched (got handshake
key 0x7ec0080, needed 0x7f00080)

This message would be more helpful to me if it specified the module
which is being loaded when the message is generated.

Does the discussion in https://rt-archive.perl.org/perl5/Ticket/Display.html?id=124201 help you understand the problem better?

Thank you very much.

--
James E Keenan (jkeenan@​cpan.org)

[p5pRT]

The RT System itself - Status changed from 'new' to 'open'

[p5pRT]

From @jkeenan

On Sat, 04 Feb 2017 23​:08​:09 GMT, frederik@​ofb.net wrote​:

This is a bug report for perl from frederik@​ofb.net,
generated with the help of perlbug 1.40 running under perl 5.24.0.

-----------------------------------------------------------------
[Please describe your issue here]

I have a number of modules which I've installed via 'cpanm'. Sometimes
when I upgrade Perl I get an error message like this​:

$ some-script-of-mine
XS.c​: loadable library and perl binaries are mismatched (got handshake
key 0x7ec0080, needed 0x7f00080)

This message would be more helpful to me if it specified the module
which is being loaded when the message is generated.

Also, can you supply the output of 'perl -V' for both the version of perl against which your module was originally compiled, as well as that for the perl to which you upgraded (assuming that the 'perl -V' attached to this ticket is neither)?

Thank you very much.
Jim Keenan

[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags​:
category=core
severity=low
---
Site configuration information for perl 5.24.0​:

Configured by builduser at Thu Sep 8 16​:15​:56 CEST 2016.

Summary of my perl5 (revision 5 version 24 subversion 0)
configuration​:

Platform​:
osname=linux, osvers=4.7.3-1-arch, archname=i686-linux-thread-multi
uname='linux flo-32 4.7.3-1-arch #1 smp preempt wed sep 7 17​:57​:38
cest 2016 i686 gnulinux '
config_args='-des -Dusethreads -Duseshrplib -Doptimize=-march=i686
-mtune=generic -O2 -pipe -fstack-protector-strong -Dprefix=/usr
-Dvendorprefix=/usr -Dprivlib=/usr/share/perl5/core_perl
-Darchlib=/usr/lib/perl5/core_perl
-Dsitelib=/usr/share/perl5/site_perl
-Dsitearch=/usr/lib/perl5/site_perl
-Dvendorlib=/usr/share/perl5/vendor_perl
-Dvendorarch=/usr/lib/perl5/vendor_perl -Dscriptdir=/usr/bin/core_perl
-Dsitescript=/usr/bin/site_perl -Dvendorscript=/usr/bin/vendor_perl
-Dinc_version_list=none -Dman1ext=1perl -Dman3ext=3perl -Dlddlflags=-
shared -Wl,-O1,--sort-common,--as-needed,-z,relro -Dldflags=-Wl,-O1,--
sort-common,--as-needed,-z,relro'
hint=recommended, useposix=true, d_sigaction=define
useithreads=define, usemultiplicity=define
use64bitint=undef, use64bitall=undef, uselongdouble=undef
usemymalloc=n, bincompat5005=undef
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',
optimize='-march=i686 -mtune=generic -O2 -pipe -fstack-protector-
strong',
cppflags='-D_REENTRANT -D_GNU_SOURCE -fwrapv -fno-strict-aliasing
-pipe -fstack-protector-strong -I/usr/local/include'
ccversion='', gccversion='6.1.1 20160802', gccosandvers=''
intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234,
doublekind=3
d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12,
longdblkind=3
ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t',
lseeksize=8
alignbytes=4, prototype=define
Linker and Libraries​:
ld='cc', ldflags ='-Wl,-O1,--sort-common,--as-needed,-z,relro
-fstack-protector-strong -L/usr/local/lib'
libpth=/usr/local/lib /usr/lib/gcc/i686-pc-linux-gnu/6.1.1/include-
fixed /usr/lib /lib
libs=-lpthread -lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc
-lgdbm_compat
perllibs=-lpthread -lnsl -ldl -lm -lcrypt -lutil -lc
libc=libc-2.24.so, so=so, useshrplib=true, libperl=libperl.so
gnulibc_version='2.24'
Dynamic Linking​:
dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E
-Wl,-rpath,/usr/lib/perl5/core_perl/CORE'
cccdlflags='-fPIC', lddlflags='-shared -Wl,-O1,--sort-common,--as-
needed,-z,relro -L/usr/local/lib -fstack-protector-strong'

---
@​INC for perl 5.24.0​:
/home/frederik/scripts-misc/perl
/home/frederik/.local/lib/perl5/i686-linux-thread-multi
/home/frederik/.local/lib/perl5
/usr/lib/perl5/site_perl
/usr/share/perl5/site_perl
/usr/lib/perl5/vendor_perl
/usr/share/perl5/vendor_perl
/usr/lib/perl5/core_perl
/usr/share/perl5/core_perl
.

---
Environment for perl 5.24.0​:
HOME=/home/frederik
LANG=en_US.UTF-8
LANGUAGE (unset)
LD_LIBRARY_PATH=/home/frederik/.local/arch/i386/lib​:/home/frederik/.local/lib​:/usr/local/lib
LOGDIR (unset)
PATH=/home/frederik/.local/bin​:/home/frederik/scripts-
misc​:/home/frederik/.local/arch/i386/bin​:/usr/bin/core_perl​:/usr/bin/vendor_perl​:/usr/bin/site_perl​:/usr/local/bin​:/usr/local/sbin​:/usr/bin
PERL5LIB=/home/frederik/scripts-
misc/perl​:/home/frederik/.local/lib/perl5​:
PERL_BADLANG (unset)
PERL_LOCAL_LIB_ROOT=/home/frederik/.local/​:/home/frederik/.local/
PERL_MB_OPT=--install_base "/home/frederik/.local/"
PERL_MM_OPT=INSTALL_BASE=/home/frederik/.local/
SHELL=/bin/zsh

--
James E Keenan (jkeenan@​cpan.org)

[p5pRT]

From frederik@ofb.net

Thank you James. Your link describes the problem but I think I
understood it already?

I'm just making a feature request for a better error message. TBH, I
could catch the module name with 'strace' or looking in the script's
'use' statements, but these things stretch my tired brain a bit, and I
imagine lazier users or harder situations exist.

I run Arch and I'm attaching 'perl -V' on the old system (same as
generated the bug report) and on an upgraded system. But the upgraded
system is 64 bit and the non-upgraded system is 32 bit, I hope that's
not a problem for you. Thanks.

On Sat, Feb 04, 2017 at 04​:27​:55PM -0800, James E Keenan via RT wrote​:

On Sat, 04 Feb 2017 23​:08​:09 GMT, frederik@​ofb.net wrote​:

This is a bug report for perl from frederik@​ofb.net,
generated with the help of perlbug 1.40 running under perl 5.24.0.

-----------------------------------------------------------------
[Please describe your issue here]

I have a number of modules which I've installed via 'cpanm'. Sometimes
when I upgrade Perl I get an error message like this​:

$ some-script-of-mine
XS.c​: loadable library and perl binaries are mismatched (got handshake
key 0x7ec0080, needed 0x7f00080)

This message would be more helpful to me if it specified the module
which is being loaded when the message is generated.

Also, can you supply the output of 'perl -V' for both the version of perl against which your module was originally compiled, as well as that for the perl to which you upgraded (assuming that the 'perl -V' attached to this ticket is neither)?

Thank you very much.
Jim Keenan

[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags​:
category=core
severity=low
---
Site configuration information for perl 5.24.0​:

Configured by builduser at Thu Sep 8 16​:15​:56 CEST 2016.

Summary of my perl5 (revision 5 version 24 subversion 0)
configuration​:

Platform​:
osname=linux, osvers=4.7.3-1-arch, archname=i686-linux-thread-multi
uname='linux flo-32 4.7.3-1-arch #1 smp preempt wed sep 7 17​:57​:38
cest 2016 i686 gnulinux '
config_args='-des -Dusethreads -Duseshrplib -Doptimize=-march=i686
-mtune=generic -O2 -pipe -fstack-protector-strong -Dprefix=/usr
-Dvendorprefix=/usr -Dprivlib=/usr/share/perl5/core_perl
-Darchlib=/usr/lib/perl5/core_perl
-Dsitelib=/usr/share/perl5/site_perl
-Dsitearch=/usr/lib/perl5/site_perl
-Dvendorlib=/usr/share/perl5/vendor_perl
-Dvendorarch=/usr/lib/perl5/vendor_perl -Dscriptdir=/usr/bin/core_perl
-Dsitescript=/usr/bin/site_perl -Dvendorscript=/usr/bin/vendor_perl
-Dinc_version_list=none -Dman1ext=1perl -Dman3ext=3perl -Dlddlflags=-
shared -Wl,-O1,--sort-common,--as-needed,-z,relro -Dldflags=-Wl,-O1,--
sort-common,--as-needed,-z,relro'
hint=recommended, useposix=true, d_sigaction=define
useithreads=define, usemultiplicity=define
use64bitint=undef, use64bitall=undef, uselongdouble=undef
usemymalloc=n, bincompat5005=undef
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',
optimize='-march=i686 -mtune=generic -O2 -pipe -fstack-protector-
strong',
cppflags='-D_REENTRANT -D_GNU_SOURCE -fwrapv -fno-strict-aliasing
-pipe -fstack-protector-strong -I/usr/local/include'
ccversion='', gccversion='6.1.1 20160802', gccosandvers=''
intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234,
doublekind=3
d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12,
longdblkind=3
ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t',
lseeksize=8
alignbytes=4, prototype=define
Linker and Libraries​:
ld='cc', ldflags ='-Wl,-O1,--sort-common,--as-needed,-z,relro
-fstack-protector-strong -L/usr/local/lib'
libpth=/usr/local/lib /usr/lib/gcc/i686-pc-linux-gnu/6.1.1/include-
fixed /usr/lib /lib
libs=-lpthread -lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc
-lgdbm_compat
perllibs=-lpthread -lnsl -ldl -lm -lcrypt -lutil -lc
libc=libc-2.24.so, so=so, useshrplib=true, libperl=libperl.so
gnulibc_version='2.24'
Dynamic Linking​:
dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E
-Wl,-rpath,/usr/lib/perl5/core_perl/CORE'
cccdlflags='-fPIC', lddlflags='-shared -Wl,-O1,--sort-common,--as-
needed,-z,relro -L/usr/local/lib -fstack-protector-strong'

---
@​INC for perl 5.24.0​:
/home/frederik/scripts-misc/perl
/home/frederik/.local/lib/perl5/i686-linux-thread-multi
/home/frederik/.local/lib/perl5
/usr/lib/perl5/site_perl
/usr/share/perl5/site_perl
/usr/lib/perl5/vendor_perl
/usr/share/perl5/vendor_perl
/usr/lib/perl5/core_perl
/usr/share/perl5/core_perl
.

---
Environment for perl 5.24.0​:
HOME=/home/frederik
LANG=en_US.UTF-8
LANGUAGE (unset)
LD_LIBRARY_PATH=/home/frederik/.local/arch/i386/lib​:/home/frederik/.local/lib​:/usr/local/lib
LOGDIR (unset)
PATH=/home/frederik/.local/bin​:/home/frederik/scripts-
misc​:/home/frederik/.local/arch/i386/bin​:/usr/bin/core_perl​:/usr/bin/vendor_perl​:/usr/bin/site_perl​:/usr/local/bin​:/usr/local/sbin​:/usr/bin
PERL5LIB=/home/frederik/scripts-
misc/perl​:/home/frederik/.local/lib/perl5​:
PERL_BADLANG (unset)
PERL_LOCAL_LIB_ROOT=/home/frederik/.local/​:/home/frederik/.local/
PERL_MB_OPT=--install_base "/home/frederik/.local/"
PERL_MM_OPT=INSTALL_BASE=/home/frederik/.local/
SHELL=/bin/zsh

--
James E Keenan (jkeenan@​cpan.org)

[p5pRT]

From frederik@ofb.net

Summary of my perl5 (revision 5 version 24 subversion 0) configuration​:
 
  Platform​:
  osname=linux, osvers=4.7.3-1-arch, archname=i686-linux-thread-multi
  uname='linux flo-32 4.7.3-1-arch #1 smp preempt wed sep 7 17​:57​:38 cest 2016 i686 gnulinux '
  config_args='-des -Dusethreads -Duseshrplib -Doptimize=-march=i686 -mtune=generic -O2 -pipe -fstack-protector-strong -Dprefix=/usr -Dvendorprefix=/usr -Dprivlib=/usr/share/perl5/core_perl -Darchlib=/usr/lib/perl5/core_perl -Dsitelib=/usr/share/perl5/site_perl -Dsitearch=/usr/lib/perl5/site_perl -Dvendorlib=/usr/share/perl5/vendor_perl -Dvendorarch=/usr/lib/perl5/vendor_perl -Dscriptdir=/usr/bin/core_perl -Dsitescript=/usr/bin/site_perl -Dvendorscript=/usr/bin/vendor_perl -Dinc_version_list=none -Dman1ext=1perl -Dman3ext=3perl -Dlddlflags=-shared -Wl,-O1,--sort-common,--as-needed,-z,relro -Dldflags=-Wl,-O1,--sort-common,--as-needed,-z,relro'
  hint=recommended, useposix=true, d_sigaction=define
  useithreads=define, usemultiplicity=define
  use64bitint=undef, use64bitall=undef, uselongdouble=undef
  usemymalloc=n, bincompat5005=undef
  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',
  optimize='-march=i686 -mtune=generic -O2 -pipe -fstack-protector-strong',
  cppflags='-D_REENTRANT -D_GNU_SOURCE -fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include'
  ccversion='', gccversion='6.1.1 20160802', gccosandvers=''
  intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234, doublekind=3
  d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12, longdblkind=3
  ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
  alignbytes=4, prototype=define
  Linker and Libraries​:
  ld='cc', ldflags ='-Wl,-O1,--sort-common,--as-needed,-z,relro -fstack-protector-strong -L/usr/local/lib'
  libpth=/usr/local/lib /usr/lib/gcc/i686-pc-linux-gnu/6.1.1/include-fixed /usr/lib /lib
  libs=-lpthread -lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc -lgdbm_compat
  perllibs=-lpthread -lnsl -ldl -lm -lcrypt -lutil -lc
  libc=libc-2.24.so, so=so, useshrplib=true, libperl=libperl.so
  gnulibc_version='2.24'
  Dynamic Linking​:
  dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E -Wl,-rpath,/usr/lib/perl5/core_perl/CORE'
  cccdlflags='-fPIC', lddlflags='-shared -Wl,-O1,--sort-common,--as-needed,-z,relro -L/usr/local/lib -fstack-protector-strong'

Characteristics of this binary (from libperl)​:
  Compile-time options​: HAS_TIMES MULTIPLICITY PERLIO_LAYERS
  PERL_COPY_ON_WRITE PERL_DONT_CREATE_GVSV
  PERL_HASH_FUNC_ONE_AT_A_TIME_HARD
  PERL_IMPLICIT_CONTEXT PERL_MALLOC_WRAP
  PERL_PRESERVE_IVUV USE_ITHREADS USE_LARGE_FILES
  USE_LOCALE USE_LOCALE_COLLATE USE_LOCALE_CTYPE
  USE_LOCALE_NUMERIC USE_LOCALE_TIME USE_PERLIO
  USE_PERL_ATOF USE_REENTRANT_API
  Built under linux
  Compiled at Sep 8 2016 16​:16​:30
  %ENV​:
  PERL5LIB="/home/frederik/scripts-misc/perl​:/home/frederik/.local/lib/perl5​:"
  PERL_LOCAL_LIB_ROOT="/home/frederik/.local/"
  PERL_MB_OPT="--install_base "/home/frederik/.local/""
  PERL_MM_OPT="INSTALL_BASE=/home/frederik/.local/"
  @​INC​:
  /home/frederik/scripts-misc/perl
  /home/frederik/.local/lib/perl5/i686-linux-thread-multi
  /home/frederik/.local/lib/perl5
  /usr/lib/perl5/site_perl
  /usr/share/perl5/site_perl
  /usr/lib/perl5/vendor_perl
  /usr/share/perl5/vendor_perl
  /usr/lib/perl5/core_perl
  /usr/share/perl5/core_perl
  .

[p5pRT]

From frederik@ofb.net

Summary of my perl5 (revision 5 version 24 subversion 1) configuration​:
 
  Platform​:
  osname=linux, osvers=4.9.3-1-arch, archname=x86_64-linux-thread-multi
  uname='linux flo-64 4.9.3-1-arch #1 smp preempt thu jan 12 21​:34​:12 cet 2017 x86_64 gnulinux '
  config_args='-des -Dusethreads -Duseshrplib -Doptimize=-march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong -Dprefix=/usr -Dvendorprefix=/usr -Dprivlib=/usr/share/perl5/core_perl -Darchlib=/usr/lib/perl5/core_perl -Dsitelib=/usr/share/perl5/site_perl -Dsitearch=/usr/lib/perl5/site_perl -Dvendorlib=/usr/share/perl5/vendor_perl -Dvendorarch=/usr/lib/perl5/vendor_perl -Dscriptdir=/usr/bin/core_perl -Dsitescript=/usr/bin/site_perl -Dvendorscript=/usr/bin/vendor_perl -Dinc_version_list=none -Dman1ext=1perl -Dman3ext=3perl -Dcccdlflags='-fPIC' -Dlddlflags=-shared -Wl,-O1,--sort-common,--as-needed,-z,relro -Dldflags=-Wl,-O1,--sort-common,--as-needed,-z,relro'
  hint=recommended, useposix=true, d_sigaction=define
  useithreads=define, usemultiplicity=define
  use64bitint=define, use64bitall=define, uselongdouble=undef
  usemymalloc=n, bincompat5005=undef
  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',
  optimize='-march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong',
  cppflags='-D_REENTRANT -D_GNU_SOURCE -fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include'
  ccversion='', gccversion='6.3.1 20170109', 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 ='-Wl,-O1,--sort-common,--as-needed,-z,relro -fstack-protector-strong -L/usr/local/lib'
  libpth=/usr/local/lib /usr/lib/gcc/x86_64-pc-linux-gnu/6.3.1/include-fixed /usr/lib /lib/../lib /usr/lib/../lib /lib /lib64 /usr/lib64
  libs=-lpthread -lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc -lgdbm_compat
  perllibs=-lpthread -lnsl -ldl -lm -lcrypt -lutil -lc
  libc=libc-2.24.so, so=so, useshrplib=true, libperl=libperl.so
  gnulibc_version='2.24'
  Dynamic Linking​:
  dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E -Wl,-rpath,/usr/lib/perl5/core_perl/CORE'
  cccdlflags='-fPIC', lddlflags='-shared -Wl,-O1,--sort-common,--as-needed,-z,relro -L/usr/local/lib -fstack-protector-strong'

Characteristics of this binary (from libperl)​:
  Compile-time options​: HAS_TIMES MULTIPLICITY PERLIO_LAYERS
  PERL_COPY_ON_WRITE PERL_DONT_CREATE_GVSV
  PERL_HASH_FUNC_ONE_AT_A_TIME_HARD
  PERL_IMPLICIT_CONTEXT PERL_MALLOC_WRAP
  PERL_PRESERVE_IVUV USE_64_BIT_ALL USE_64_BIT_INT
  USE_ITHREADS USE_LARGE_FILES USE_LOCALE
  USE_LOCALE_COLLATE USE_LOCALE_CTYPE
  USE_LOCALE_NUMERIC USE_LOCALE_TIME USE_PERLIO
  USE_PERL_ATOF USE_REENTRANT_API
  Built under linux
  Compiled at Jan 15 2017 14​:53​:40
  %ENV​:
  PERL5LIB="/home/frederik/scripts-misc/perl​:/home/frederik/.local/lib/perl5​:"
  PERL_LOCAL_LIB_ROOT="/home/frederik/.local/​:/home/frederik/.local/​:/home/frederik/.local/"
  PERL_MB_OPT="--install_base "/home/frederik/.local/""
  PERL_MM_OPT="INSTALL_BASE=/home/frederik/.local/"
  @​INC​:
  /home/frederik/scripts-misc/perl
  /home/frederik/.local/lib/perl5/x86_64-linux-thread-multi
  /home/frederik/.local/lib/perl5
  /usr/lib/perl5/site_perl
  /usr/share/perl5/site_perl
  /usr/lib/perl5/vendor_perl
  /usr/share/perl5/vendor_perl
  /usr/lib/perl5/core_perl
  /usr/share/perl5/core_perl
  .

[p5pRT]

From @tonycoz

On Sat, 04 Feb 2017 18​:06​:42 -0800, frederik@​ofb.net wrote​:

Thank you James. Your link describes the problem but I think I
understood it already?

I'm just making a feature request for a better error message. TBH, I
could catch the module name with 'strace' or looking in the script's
'use' statements, but these things stretch my tired brain a bit, and I
imagine lazier users or harder situations exist.

I run Arch and I'm attaching 'perl -V' on the old system (same as
generated the bug report) and on an upgraded system. But the upgraded
system is 64 bit and the non-upgraded system is 32 bit, I hope that's
not a problem for you. Thanks.

This might be a (conceptual) bug in Perl_xs_handshake().

The XS handshake uses the size of the interpreter structure as part of
a "signature" for the perl build, assuming that a change in size means that the versions of perl are incompatible.

But maintenance releases *can* safely add members to the end of the interpreter structure, and 2bfbbba does just that.

The handshake values in frederick's error message​:

(got handshake key 0x7ec0080, needed 0x7f00080)

extract the structure sizes​:

got 0x7ec

needed 0x7f0

which differ in sizeof(STRLEN) on the 32-bit system in the original -V output.

So I think Perl_xs_handshake() should only be checking that the size has not shrunk in maintenance releases.

One problem with that is it signifcantly reduces the strength of that check - Perl_xs_handshake() would no longer be detecting the type of problems we want it to detect - differences in sizes of the interpreter structure due to changes to the sizes of it's members (eg use64bitint changes) or due to build options (PERL_HASH_RANDOMIZE_KEYS for example) which may weaken the current interface to near uselessness.

Tony

[p5pRT]

From @iabyn

On Sat, Feb 04, 2017 at 03​:08​:09PM -0800, via RT wrote​:

I have a number of modules which I've installed via 'cpanm'. Sometimes
when I upgrade Perl I get an error message like this​:

$ some\-script\-of\-mine
XS\.c​: loadable library and perl binaries are mismatched \(got handshake key 0x7ec0080\, needed 0x7f00080\)

This message would be more helpful to me if it specified the module
which is being loaded when the message is generated.

Leaving aside the discussions elsewhere in this thread about the handshake
key, as regards displaying the name if the module being loaded, it
already does, kinda.

XS\.c​: loadable library and perl binaries are mismatched \.\.\.

XS.c is the name of the src file from which the loadable lib was compiled;
which isn't same as the name of the perl module, but may hint at it; for
example​:

  $ ./perl -I../perl-5.24.1t/lib -MPerlIO​::scalar -e 1
  scalar.c​: loadable library and perl binaries are mismatched ...
  $

The error is given at the point when a dynamic library is loaded; this
*may* have been triggered by a use/require, but not necessary.
I suppose we could examine the context stack for an active require, and
if so include that in the error message, e.g.

  while loading MPerlIO​::scalar​: scalar.c​: loadable library and perl binaries are mismatched ...

--
The Enterprise's efficient long-range scanners detect a temporal vortex
distortion in good time, allowing it to be safely avoided via a minor
course correction.
  -- Things That Never Happen in "Star Trek" #21

[p5pRT]

From frederik@ofb.net

The error is given at the point when a dynamic library is loaded; this
*may* have been triggered by a use/require, but not necessary.
I suppose we could examine the context stack for an active require, and
if so include that in the error message, e.g.

while loading MPerlIO​::scalar​: scalar\.c​: loadable library and perl binaries are mismatched \.\.\.

That's more or less what I had in mind. Up to you if it's too much
work / complexity. Would it be easier to just print the full path to
the dynamic library, which would reveal both the module name and where
it is installed?

I guess one could argue that I should just have a command to recompile
all the locally-installed modules which need recompilation, whenever I
upgrade Perl; since it may not be workable to test each of my scripts
individually to see if it produces this message. Module dependencies
are handled automatically by my distro package manager, but how to do
this recompilation with e.g. all 'cpanm'-installed modules, I don't
know.

Thanks,

Frederick

[p5pRT]

From @Grinnz

On Mon, Feb 6, 2017 at 12​:53 PM, <frederik@​ofb.net> wrote​:

I guess one could argue that I should just have a command to recompile
all the locally-installed modules which need recompilation, whenever I
upgrade Perl; since it may not be workable to test each of my scripts
individually to see if it produces this message. Module dependencies
are handled automatically by my distro package manager, but how to do
this recompilation with e.g. all 'cpanm'-installed modules, I don't
know.

Thanks,

Frederick

Generally, the preferred approach is not installing to a package-managed
perl using CPAN.pm or cpanm, and instead installing to a local​::lib which
can be blown-away and reinstalled easily upon upgrading perl. (Or by
installing your own separate perl for development use, using perl-build,
perlbrew, or plenv.) CPAN.pm and cpanm both default to installing to a
local​::lib if run without write permission to the perl's lib directories,
it's just a matter of setting it up for your user, usually involving adding
a line to .bashrc.

-Dan

[p5pRT]

From @Leont

On Mon, Feb 6, 2017 at 12​:30 PM, Dave Mitchell <davem@​iabyn.com> wrote​:

XS\.c​: loadable library and perl binaries are mismatched \.\.\.

XS.c is the name of the src file from which the loadable lib was compiled;
which isn't same as the name of the perl module, but may hint at it; for
example​:

$ \./perl \-I\.\./perl\-5\.24\.1t/lib \-MPerlIO​::scalar \-e 1
scalar\.c​: loadable library and perl binaries are mismatched \.\.\.
$

The error is given at the point when a dynamic library is loaded; this
*may* have been triggered by a use/require, but not necessary.
I suppose we could examine the context stack for an active require, and
if so include that in the error message, e.g.

while loading MPerlIO​::scalar​: scalar\.c​: loadable library and perl

binaries are mismatched ...

The bootstrap function already received the arguments to
DynaLoader/XSLoader, and xs_handshake has access to the stack (even if it's
awkward).

Leon

[p5pRT]

From @andk

On Mon, 6 Feb 2017 09​:53​:13 -0800, frederik@​ofb.net said​:

I guess one could argue that I should just have a command to recompile
all the locally-installed modules which need recompilation, whenever I
upgrade Perl;

CPAN.pm has a command for that. It's called 'recompile'.

--
andreas

[p5pRT]

From frederik@ofb.net

On Mon, Feb 06, 2017 at 07​:54​:09PM +0100, Andreas Koenig wrote​:

On Mon, 6 Feb 2017 09​:53​:13 -0800, frederik@​ofb.net said​:

I guess one could argue that I should just have a command to recompile
all the locally-installed modules which need recompilation, whenever I
upgrade Perl;

CPAN.pm has a command for that. It's called 'recompile'.

I knew about CPAN​::recompile but I had thought I would need a
cpanminus-specific solution. Now I find that it seems to work with my
setup. I don't think I've configured CPAN other than that I have
something in ~/.zprofile like this​:

  eval $(perl -Mlocal​::lib=.local)

I ran the command

  perl -MCPAN -e 'recompile()'

and after fetching metadata it seems to be doing the recompilation
without any trouble (aside from very occasionally stopping and asking
questions).

So another possibility for the error message would be to have it
suggest the user recompile all local modules, and point them to
CPAN(3perl)...?

Thanks,

Frederick