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[perl #118059] race condition+fail in dist\IO\t\cachepropagate-tcp.t
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From:
bulk88
Date:
May 20, 2013 03:25
Subject:
[perl #118059] race condition+fail in dist\IO\t\cachepropagate-tcp.t
Message ID:
rt-3.6.HEAD-2650-1369020290-1146.118059-75-0@perl.org
# New Ticket Created by bulk88
# Please include the string: [perl #118059]
# in the subject line of all future correspondence about this issue.
# <URL: https://rt.perl.org:443/rt3/Ticket/Display.html?id=118059 >
This is a bug report for perl from bulk88@hotmail.com,
generated with the help of perlbug 1.39 running under perl 5.19.0.
-----------------------------------------------------------------
[Please describe your issue here]
There is a race condition in cachepropagate-tcp.t between the parent
proc's accept() and the child proc's connection since the child proc has
a "sleep(1);" delay. On my Win32 32 bit, Server 2003 x64, 8 core, VC
2008 Perl, the ->accept() times out, does not return an obj, and then
fatally errors when ->sockdomain() is called on an undefined scalar. Example
___________________________________________________________________________
C:\p519\src\t>..\perl.exe -I..\lib harness ../dist/IO/t/cachepropagate-tcp.t
../dist/IO/t/cachepropagate-tcp.t .. 1/8 Can't call method "sockdomain"
on an un
defined value at t/cachepropagate-tcp.t line 46.
# Looks like you planned 8 tests but ran 5.
# Looks like your test exited with 9 just after 5.
../dist/IO/t/cachepropagate-tcp.t .. Dubious, test returned 9 (wstat
2304, 0x900
)
Failed 3/8 subtests
Test Summary Report
-------------------
../dist/IO/t/cachepropagate-tcp.t (Wstat: 2304 Tests: 5 Failed: 0)
Non-zero exit status: 9
Parse errors: Bad plan. You planned 8 tests but ran 5.
Files=1, Tests=5, 2 wallclock secs ( 0.03 usr + 0.00 sys = 0.03 CPU)
Result: FAIL
C:\p519\src\t>
___________________________________________________________________________
running with -v,
___________________________________________________________________________
C:\p519\src\t>..\perl.exe -I..\lib harness -v
../dist/IO/t/cachepropagate-tcp.t
../dist/IO/t/cachepropagate-tcp.t ..
1..8
ok 1 - socket created
ok 2 - protocol defined
ok 3 - domain defined
ok 4 - type defined
ok 5 - spawned a child
Can't call method "sockdomain" on an undefined value at
t/cachepropagate-tcp.t l
ine 46.
# Looks like you planned 8 tests but ran 5.
# Looks like your test exited with 9 just after 5.
Dubious, test returned 9 (wstat 2304, 0x900)
Failed 3/8 subtests
Test Summary Report
-------------------
../dist/IO/t/cachepropagate-tcp.t (Wstat: 2304 Tests: 5 Failed: 0)
Non-zero exit status: 9
Parse errors: Bad plan. You planned 8 tests but ran 5.
Files=1, Tests=5, 1 wallclock secs ( 0.02 usr + 0.00 sys = 0.02 CPU)
Result: FAIL
C:\p519\src\t>
__________________________________________________________________________
line 46 is
__________________________________________________________________________
my $new = $listener->accept();
>>>>>>>>>>>>>>>>>> is($new->sockdomain(), $d, 'domain match');
__________________________________________________________________________
accept the function in IO::Socket::accept the method fails with $! being
"Bad file descriptor"/9. From my research on my machine the timeout is
undefined, so IO::Select and can_read parts of IO::Socket::accept are
not executed.
The failing test was added in
http://perl5.git.perl.org/perl.git/commit/93a5d7bfc07a41ef26fb3e3b298a7d88c3741ed1?f=dist/IO/t/cachepropagate-tcp.t
as part of CPAN RT #61577 and was written by Daniel Kahn Gillmor. I dont
see any explanation for the "sleep(1);" in the child fork proc.
If I put a "sleep(1);" before the ->accept(), it passes for me most (4
trys pass, 5th failed) of the time. If I put a 2 sec sleep, it always
(10 trys, no fail) passes, but 2 seconds of sleeping is alot of wall
time wasted. If I remove the sleep(1) from the child proc, it always
fails (10 fails out of 10 trys). If I put a sleep(1) at the accept,
remove the sleep(1) at the child (child does not sleep), 10 passes out
of 10 trys. This sockets/unix IO/unix events stuff I am not very
familiar with, so I dont know how to fix it.
[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
category=library
severity=medium
module=IO
---
Site configuration information for perl 5.19.0:
Configured by Administrator at Sun May 19 19:59:16 2013.
Summary of my perl5 (revision 5 version 19 subversion 0 patch blead
2013-05-19.21:05:35 bb003204009d113d60d4173c3ed72b10c8169f14
v5.18.0-25-gbb00320) configuration:
Snapshot of: bb003204009d113d60d4173c3ed72b10c8169f14
Platform:
osname=MSWin32, osvers=5.2, archname=MSWin32-x86-multi-thread
uname=''
config_args='undef'
hint=recommended, useposix=true, d_sigaction=undef
useithreads=define, usemultiplicity=define
useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
use64bitint=undef, use64bitall=undef, uselongdouble=undef
usemymalloc=n, bincompat5005=undef
Compiler:
cc='cl', ccflags ='-nologo -GF -W3 -O1 -MD -Zi -DNDEBUG -GS- -GL
-DWIN32 -D_CONSOLE -DNO_STRICT -D_CRT_SECURE_NO_DEPRECATE
-D_CRT_NONSTDC_NO_DEPRECATE -DPERL_TEXTMODE_SCRIPTS
-DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_SYS -DUSE_PERLIO',
optimize='-O1 -MD -Zi -DNDEBUG -GS- -GL',
cppflags='-DWIN32'
ccversion='15.00.30729.01', gccversion='', gccosandvers=''
intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
d_longlong=undef, longlongsize=8, d_longdbl=define, longdblsize=8
ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='__int64',
lseeksize=8
alignbytes=8, prototype=define
Linker and Libraries:
ld='link', ldflags ='-nologo -nodefaultlib -debug -opt:ref,icf
-ltcg -libpath:"c:\p519\lib\CORE" -machine:x86'
libpth=\lib
libs=oldnames.lib kernel32.lib user32.lib gdi32.lib winspool.lib
comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib
netapi32.lib uuid.lib ws2_32.lib mpr.lib winmm.lib version.lib
odbc32.lib odbccp32.lib comctl32.lib msvcrt.lib
perllibs=oldnames.lib kernel32.lib user32.lib gdi32.lib
winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib
oleaut32.lib netapi32.lib uuid.lib ws2_32.lib mpr.lib winmm.lib
version.lib odbc32.lib odbccp32.lib comctl32.lib msvcrt.lib
libc=msvcrt.lib, so=dll, useshrplib=true, libperl=perl519.lib
gnulibc_version=''
Dynamic Linking:
dlsrc=dl_win32.xs, dlext=dll, d_dlsymun=undef, ccdlflags=' '
cccdlflags=' ', lddlflags='-dll -nologo -nodefaultlib -debug
-opt:ref,icf -ltcg -libpath:"c:\p519\lib\CORE" -machine:x86'
Locally applied patches:
---
@INC for perl 5.19.0:
C:/p519/site/lib
C:/p519/lib
.
---
Environment for perl 5.19.0:
CYGWIN=tty
HOME (unset)
LANG (unset)
LANGUAGE (unset)
LD_LIBRARY_PATH (unset)
LOGDIR (unset)
PATH=C:\p519\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\Program
Files (x86)\Microsoft Visual Studio 9.0\VC\bin;C:\Program Files
(x86)\Microsoft Visual Studio 9.0\VC;C:\Program Files\TortoiseGit\bin
PERL_BADLANG (unset)
SHELL (unset)
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