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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 occupiedCan'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 occupiedThis is likely caused by a conflict betweencygperl5._39_10.dll andmro.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 0x00029000I 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=-gmake test-prep- fork with mro loaded:
./perl -Ilib -Mmro -eforkExpected behavior
fork() is successful.
Perl configuration
# perl -V output goes hereSummary 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