Closed
Description
Module:
Description
Since the 5.39.10 version bump CI has been failing on Cygwin with errors like:
0 [main] perl 11614 child_info_fork::abort: address space needed by 'mro.dll' (0x190000) is already occupied
Can't fork, trying again in 5 seconds at t/lib/MakeMaker/Test/Utils.pm line 325.
I've managed to reproduce this locally and consistently with current cygwin, though with a different address:
tony@enceladus ~/dev/perl/git/perl
$ ./perl -Ilib -Mmro -efork
0 [main] perl 34054 child_info_fork::abort: address space needed by 'mro.dll' (0x400000) is already occupied
This is likely caused by a conflict between cygperl5._39_10.dll and mro.dll:
$ rebase -i `find . -name '*.dll'` ./perl.exe | grep -F '*'
/home/tony/dev/perl/git/perl/cygperl5_39_10.dll base 0x00041db50000 size 0x00b4c000 *
/home/tony/dev/perl/git/perl/lib/auto/mro/mro.dll base 0x00041e510000 size 0x0002c000 *
Building without -DDEBUGGING does not fail to work, probably because the DLL uses less address space and hence there's no conflict:
# without -DDEBUGGING
/home/tony/dev/perl/git/perl/cygperl5_39_10.dll base 0x00041db50000 size 0x0081e000
/home/tony/dev/perl/git/perl/lib/auto/mro/mro.dll base 0x00041e510000 size 0x00029000
I think this was caused by the name change for the cygperl DLL introduced by the version bump.
We use --enable-auto-image-base in the perl and module makefiles to generate the base addresses of DLLs in the perl build in cygwin. This generates the DLL bases addresses based on a hash of the DLL name, resulting in the conflict here.
Steps to Reproduce
- On cygwin, build perl with:
./Configure -des -Dusedevel -DDEBUGGING -Doptimize=-g
make test-prep
- fork with mro loaded:
./perl -Ilib -Mmro -efork
Expected behavior
fork() is successful.
Perl configuration
# perl -V output goes here
Summary of my perl5 (revision 5 version 39 subversion 10) configuration:
Commit id: e37d0248e80396cf27564f6205584d2024df704d
Platform:
osname=cygwin
osvers=3.5.1-1.x86_64
archname=cygwin-thread-multi
uname='cygwin_nt-10.0-19045 enceladus 3.5.1-1.x86_64 2024-02-27 11:54 utc x86_64 cygwin '
config_args='-des -Dusedevel -Doptimize=-g -DDEBUGGING'
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='gcc'
ccflags ='-U__STRICT_ANSI__ -D_GNU_SOURCE -fwrapv -DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector-strong'
optimize='-g'
cppflags='-U__STRICT_ANSI__ -D_GNU_SOURCE -fwrapv -DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector-strong'
ccversion=''
gccversion='11.4.0'
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='g++'
ldflags =' -Wl,--enable-auto-import -Wl,--export-all-symbols -Wl,--enable-auto-image-base -fstack-protector-strong -L/usr/local/lib'
libpth=/usr/lib /usr/lib/w32api /usr/local/lib /lib
libs=-lpthread -ldl -lcrypt
perllibs=-lpthread -ldl -lcrypt
libc=/usr/lib/libcygwin.a
so=dll
useshrplib=true
libperl=cygperl5_39_10.dll
gnulibc_version=''
Dynamic Linking:
dlsrc=dl_dlopen.xs
dlext=dll
d_dlsymun=undef
ccdlflags=' '
cccdlflags=' '
lddlflags=' --shared -Wl,--enable-auto-import -Wl,--export-all-symbols -Wl,--enable-auto-image-base -L/usr/local/lib -fstack-protector-strong'
Characteristics of this binary (from libperl):
Compile-time options:
DEBUGGING
HAS_LONG_DOUBLE
HAS_STRTOLD
HAS_TIMES
MULTIPLICITY
PERLIO_LAYERS
PERL_COPY_ON_WRITE
PERL_DONT_CREATE_GVSV
PERL_HASH_FUNC_SIPHASH13
PERL_HASH_USE_SBOX32
PERL_MALLOC_WRAP
PERL_OP_PARENT
PERL_PRESERVE_IVUV
PERL_TRACK_MEMPOOL
PERL_USE_DEVEL
PERL_USE_SAFE_PUTENV
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 cygwin
Compiled at Mar 27 2024 15:03:04
%ENV:
CYGWIN="detect_bloda"
@INC:
lib
/usr/local/lib/perl5/site_perl/5.39.10/cygwin-thread-multi
/usr/local/lib/perl5/site_perl/5.39.10
/usr/local/lib/perl5/5.39.10/cygwin-thread-multi
/usr/local/lib/perl5/5.39.10