[perl #134201] Recent dist/IO update breaks tests

# New Ticket Created by  Sergey Aleynikov 
# Please include the string:  [perl #134201]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org/Ticket/Display.html?id=134201 >


This is a bug report for perl from sergey.aleynikov@gmail.com,
generated with the help of perlbug 1.41 running under perl 5.31.1.


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

The following two tests results in a timeout:

% ./perl harness -v ../dist/IO/t/io_udp.t
../dist/IO/t/io_udp.t ..
1..15
ok 1
ok 2
ok 3
ok 4
ok 5
ok 6
ok 7 - created C socket# Failed test 10 - send to a at t/io_udp.t line 87

ok 8 - connect C to A
ok 9 - connected a UDP socket
not ok 10 - send to a
# Test process timed out - terminating
Failed 6/15 subtests

Test Summary Report
-------------------
../dist/IO/t/io_udp.t (Wstat: 9 Tests: 10 Failed: 1)
  Failed test:  10
  Non-zero wait status: 9
  Parse errors: Bad plan.  You planned 15 tests but ran 10.
Files=1, Tests=10, 15 wallclock secs ( 0.00 usr  0.01 sys +  0.03 cusr
 0.00 csys =  0.04 CPU)
Result: FAIL

% ./perl harness -v ../dist/IO/t/io_sock.t
../dist/IO/t/io_sock.t ..
1..26
ok 1
ok 2
ok 3
ok 4
ok 5
ok 6
ok 7
ok 8
ok 9
ok 10
ok 11

Died at t/io_sock.t line 33, <GEN5> line 2.
Dubious, test returned 4 (wstat 1024, 0x400)
Failed 15/26 subtests

Test Summary Report
-------------------
../dist/IO/t/io_sock.t (Wstat: 1024 Tests: 11 Failed: 0)
  Non-zero exit status: 4
  Parse errors: Bad plan.  You planned 26 tests but ran 11.
Files=1, Tests=11, 120 wallclock secs ( 0.01 usr  0.00 sys +  0.04
cusr  0.02 csys =  0.07 CPU)
Result: FAIL

[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
    category=core
    severity=medium
---
Site configuration information for perl 5.31.1:

Configured by dur-randir at Mon Jun 17 16:40:32 MSK 2019.

Summary of my perl5 (revision 5 version 31 subversion 1) configuration:
  Commit id: fa068f6da2218ae85bae1e26ee7591c15276555f
  Platform:
    osname=darwin
    osvers=13.4.0
    archname=darwin-thread-multi-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 -DDEBUGGING -Dusethreads'
    hint=recommended
    useposix=true
    d_sigaction=define
    useithreads=define
    usemultiplicity=define
    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
-DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector
-I/usr/local/include -DPERL_USE_SAFE_PUTENV'
    optimize='-O3 -g'
    cppflags='-fno-common -DPERL_DARWIN -mmacosx-version-min=10.9
-DDEBUGGING -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=/usr/local/lib
/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
/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 5.31.1:
    lib
    /usr/local/lib/perl5/site_perl/5.31.1/darwin-thread-multi-2level
    /usr/local/lib/perl5/site_perl/5.31.1
    /usr/local/lib/perl5/5.31.1/darwin-thread-multi-2level
    /usr/local/lib/perl5/5.31.1
    /usr/local/lib/perl5/site_perl

---
Environment for perl 5.31.1:
    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_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_SHELLRC_VERSION=0.84
    PERLBREW_VERSION=0.84
    PERL_BADLANG (unset)
    SHELL=/usr/local/bin/zsh

• [perl #134201] Recent dist/IO update breaks tests by Tony Cook via RT
• [perl #134201] Recent dist/IO update breaks tests by Sergey Aleynikov via RT
• [perl #134201] Recent dist/IO update breaks tests by Tony Cook via RT
• [perl #134201] Recent dist/IO update breaks tests by Sergey Aleynikov