[perl #132792] Blead is broken on Darwin

# New Ticket Created by  Sergey Aleynikov 
# Please include the string:  [perl #132792]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org/Ticket/Display.html?id=132792 >


This is a bug report for perl from sergey.aleynikov@gmail.com,
generated with the help of perlbug 1.41 running under perl 5.27.9.


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

After a recent commit series, a lot of tests crashes like this:

./perl harness re/charset.t
re/charset.t .. perl(86497,0x7fff7ad34310) malloc: *** error for
object 0x7ff1e9600100: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug
re/charset.t .. No subtests run

Test Summary Report
-------------------
re/charset.t (Wstat: 6 Tests: 0 Failed: 0)
  Non-zero wait status: 6
  Parse errors: No plan found in TAP output
Files=1, Tests=0,  0 wallclock secs ( 0.01 usr  0.00 sys +  0.02 cusr
0.01 csys =  0.04 CPU)
Result: FAIL

At least the following are affected: run/locale.t re/charset.t
re/fold_grind.t. I'll provide complete bisect later.

[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
    category=core
    severity=high
---
Site configuration information for perl 5.27.9:

Configured by dur-randir at Wed Jan 31 10:14:37 MSK 2018.

Summary of my perl5 (revision 5 version 27 subversion 9) configuration:
  Commit id: 577d3e04be845580196418dd9df1575e2cb4c0b6
  Platform:
    osname=darwin
    osvers=13.4.0
    archname=darwin-2level
    uname='darwin isengard.local 13.4.0 darwin kernel version 13.4.0:
mon jan 11 18:17:34 pst 2016; root:xnu-2422.115.15~1release_x86_64
x86_64 '
    config_args='-de -Dusedevel'
    hint=recommended
    useposix=true
    d_sigaction=define
    useithreads=undef
    usemultiplicity=undef
    use64bitint=define
    use64bitall=define
    uselongdouble=undef
    usemymalloc=n
    default_inc_excludes_dot=define
    bincompat5005=undef
  Compiler:
    cc='cc'
    ccflags ='-fno-common -DPERL_DARWIN -mmacosx-version-min=10.9
-fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include
-DPERL_USE_SAFE_PUTENV'
    optimize='-O3'
    cppflags='-fno-common -DPERL_DARWIN -mmacosx-version-min=10.9
-fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include'
    ccversion=''
    gccversion='4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.56)'
    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 =' -mmacosx-version-min=10.9 -fstack-protector -L/usr/local/lib'
    libpth=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/clang/6.0/lib
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/usr/lib
/usr/local/lib /usr/lib
    libs=-lpthread -lgdbm -ldbm -ldl -lm -lutil -lc
    perllibs=-lpthread -ldl -lm -lutil -lc
    libc=
    so=dylib
    useshrplib=false
    libperl=libperl.a
    gnulibc_version=''
  Dynamic Linking:
    dlsrc=dl_dlopen.xs
    dlext=bundle
    d_dlsymun=undef
    ccdlflags=' '
    cccdlflags=' '
    lddlflags=' -mmacosx-version-min=10.9 -bundle -undefined
dynamic_lookup -L/usr/local/lib -fstack-protector'


---
@INC for perl 5.27.9:
    lib
    /usr/local/lib/perl5/site_perl/5.27.9/darwin-2level
    /usr/local/lib/perl5/site_perl/5.27.9
    /usr/local/lib/perl5/5.27.9/darwin-2level
    /usr/local/lib/perl5/5.27.9

---
Environment for perl 5.27.9:
    DYLD_LIBRARY_PATH (unset)
    HOME=/Users/dur-randir
    LANG=en_US.UTF-8
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/Users/dur-randir/perlbrew/bin:/Users/dur-randir/perlbrew/perls/perl-5.22.1/bin:/usr/local/bin:/usr/local/sbin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/texbin
    PERLBREW_BASHRC_VERSION=0.80
    PERLBREW_HOME=/Users/dur-randir/.perlbrew
    PERLBREW_MANPATH=/Users/dur-randir/perlbrew/perls/perl-5.22.1/man
    PERLBREW_PATH=/Users/dur-randir/perlbrew/bin:/Users/dur-randir/perlbrew/perls/perl-5.22.1/bin
    PERLBREW_PERL=perl-5.22.1
    PERLBREW_ROOT=/Users/dur-randir/perlbrew
    PERLBREW_VERSION=0.80
    PERL_BADLANG (unset)
    SHELL=/usr/local/bin/zsh

• [perl #132792] Blead is broken on Darwin by Karl Williamson via RT
• [perl #132792] Blead is broken on Darwin by Sergey Aleynikov via RT
• Re: [perl #132792] Blead is broken on Darwin by Karl Williamson
• [perl #132792] Blead is broken on Darwin by Sergey Aleynikov via RT
• [perl #132792] Blead is broken on Darwin by Sergey Aleynikov via RT
• [perl #132792] Blead is broken on Darwin by Sergey Aleynikov