11:01 a.m.
https://bugzilla.redhat.com/show_bug.cgi?id=849703
Bug ID: 849703
QA Contact: extras-qa(a)fedoraproject.org
Severity: unspecified
Version: 16
Priority: unspecified
CC: cweyl(a)alumni.drew.edu, iarnell(a)gmail.com,
jplesnik(a)redhat.com, kasal(a)ucw.cz, lkundrak(a)v3.sk,
mmaslano(a)redhat.com,
perl-devel(a)lists.fedoraproject.org, ppisar(a)redhat.com,
psabata(a)redhat.com, rc040203(a)freenet.de,
tcallawa(a)redhat.com
Assignee: mmaslano(a)redhat.com
Summary: Regular Expression matching in signal handler causes
side-effects
Regression: ---
Story Points: ---
Classification: Fedora
OS: Unspecified
Reporter: tim(a)electronghost.co.uk
Type: Bug
Documentation: ---
Hardware: Unspecified
Mount Type: ---
Status: NEW
Component: perl
Product: Fedora
Description of problem:
Executing an RE inside a PERL deferred signal handler causes an unwanted side
effect on RE-execution in the code that was being executed when the signal
arrived.
Version-Release number of selected component (if applicable):
"This is perl 5, version 14, subversion 2 (v5.14.2) built for
x86_64-linux-thread-multi"
How reproducible:
Always
Steps to Reproduce:
Here is a test case:
====== CUT HERE ======
#!/usr/bin/env perl
sub sighup {
my $bar="This-Has-Dashes-HUP";
$bar=~s/.*-//;
print "$bar\n";
}
$SIG{'HUP'}=\&sighup;
while (1) {
my $foo="This:Has:Colons";
$foo=~s/.*://;
if ($foo=~m/:/) {
print "BUG!!: $foo\n";
}
}
====== CUT HERE ======
Run this endless loop and arrange to send it a SIGHUP once per second.
Actual results:
You will see output like the following:
bash$ perl ./t.pl
HUP
HUP
HUP
HUP
BUG!!: This:Has:Colons
HUP
HUP
BUG!!: This:Has:Colons
HUP
BUG!!: This:Has:Colons
HUP
BUG!!: This:Has:Colons
HUP
HUP
BUG!!: This:Has:Colons
HUP
BUG!!: This:Has:Colons
HUP
HUP
BUG!!: This:Has:Colons
HUP
HUP
HUP
BUG!!: This:Has:Colons
Expected results:
You should get output like this (observed on "This is perl 5, version 12,
subversion 4 (v5.12.4) built for x86_64-linux-thread-multi" from Fedora 15):
bash$ perl ./t.pl
HUP
HUP
HUP
HUP
HUP
HUP
HUP
HUP
HUP
HUP
HUP
HUP
HUP
HUP
HUP
HUP
HUP
HUP
HUP
HUP
HUP
HUP
HUP
HUP
HUP
HUP
HUP
HUP
HUP
HUP
Additional info:
This is not a crash, like 809796, though they are very likely related or the
same problem.
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9:43 a.m.
New subject: [Bug 849703] Regular Expression matching in signal handler causes side-effects
https://bugzilla.redhat.com/show_bug.cgi?id=849703
Petr Pisar <ppisar(a)redhat.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
See Also| |https://bugzilla.redhat.com
| |/show_bug.cgi?id=809796
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6:38 a.m.
New subject: [Bug 849703] Regular Expression matching in signal handler causes side-effects
https://bugzilla.redhat.com/show_bug.cgi?id=849703
Petr Pisar <ppisar(a)redhat.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
URL| |http://permalink.gmane.org/
| |gmane.comp.lang.perl.perl5.
| |porters/115209
--- Comment #1 from Petr Pisar <ppisar(a)redhat.com> ---
Fix in upstream blead branch:
commit b93070ed2e35b0430327cc866a4fcf4042014513
Author: David Mitchell <davem(a)iabyn.com>
Date: Tue May 15 12:55:22 2012 +0100
eliminate PL_reglast(close)?paren, PL_regoffs
breaks ABI
<http://permalink.gmane.org/gmane.comp.lang.perl.perl5.porters/115209>;.
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8:25 a.m.
New subject: [Bug 849703] Regular Expression matching in signal handler causes side-effects
https://bugzilla.redhat.com/show_bug.cgi?id=849703
--- Comment #2 from Mark Phillips <markcsr(a)virginmedia.com> ---
Created attachment 619787
--> https://bugzilla.redhat.com/attachment.cgi?id=619787&action=edit
Patch which maintains binary compatiblity
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8:25 a.m.
New subject: [Bug 849703] Regular Expression matching in signal handler causes side-effects
https://bugzilla.redhat.com/show_bug.cgi?id=849703
Mark Phillips <markcsr(a)virginmedia.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |markcsr(a)virginmedia.com
--- Comment #3 from Mark Phillips <markcsr(a)virginmedia.com> ---
Unfortunately simply backporting the fix from 5.17 chagelist
b93070ed2e35b0430327cc866a4fcf4042014513 breaks binary compatibility
with plugins.
In particular after re-compiling and installing the Fedora 17 perl RPM
(perl-5.14.2-212.fc17.src.rpm), the automake package started crashing.
The regression tests were all ok.
I have tweaked the back-port to maintain compatibility in three areas (I
am not sure which are important) and now it maintains compatibility and
works with other pre-compiled perl 5.14.2 packages.
The areas I tweaked were:-
1) Modified regcppush/regcppop to push/pop the same values as before the
patch (in particular to still push/pop PL_regoffs, even though it is no
longer used).
2) Modified regcppush/regcppop to have the same prototype as before the
patch, except to make the argument to regcppop non-const. The pop code
writes to both rex and the (unused) PL_* variables.
3) Left the deprecrated PL variables in re_save_state so that the
interpretor object is unchanged - I suspect this is the critical change.
4) The PL_regoffs/PL_reglastparen/PL_reglastcloseparen variables are now
only used by regcppush. I have modified everywere regcppush is called to
set them correctly before regcppush...
I have attached the working patch which appears to pass regression
testing and allows a pre-compiled automake to work when using other
pre-compiled 5.14.2 libs.
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9:57 a.m.
New subject: [Bug 849703] Regular Expression matching in signal handler causes side-effects
Product: Fedora
https://bugzilla.redhat.com/show_bug.cgi?id=849703
--- Comment #4 from Fedora End Of Life <endoflife(a)fedoraproject.org> ---
This message is a reminder that Fedora 16 is nearing its end of life.
Approximately 4 (four) weeks from now Fedora will stop maintaining
and issuing updates for Fedora 16. It is Fedora's policy to close all
bug reports from releases that are no longer maintained. At that time
this bug will be closed as WONTFIX if it remains open with a Fedora
'version' of '16'.
Package Maintainer: If you wish for this bug to remain open because you
plan to fix it in a currently maintained version, simply change the 'version'
to a later Fedora version prior to Fedora 16's end of life.
Bug Reporter: Thank you for reporting this issue and we are sorry that
we may not be able to fix it before Fedora 16 is end of life. If you
would still like to see this bug fixed and are able to reproduce it
against a later version of Fedora, you are encouraged to click on
"Clone This Bug" and open it against that version of Fedora.
Although we aim to fix as many bugs as possible during every release's
lifetime, sometimes those efforts are overtaken by events. Often a
more recent Fedora release includes newer upstream software that fixes
bugs or makes them obsolete.
The process we are following is described here:
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11:57 a.m.
New subject: [Bug 849703] Regular Expression matching in signal handler causes side-effects
Product: Fedora
https://bugzilla.redhat.com/show_bug.cgi?id=849703
Jan Pazdziora <jpazdziora(a)redhat.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jpazdziora(a)redhat.com
Version|16 |17
--- Comment #5 from Jan Pazdziora <jpazdziora(a)redhat.com> ---
Issue still present on Fedora 17:
$ rpm -q perl
perl-5.14.3-218.fc17.i686
$ perl
#!/usr/bin/env perl
sub sighup {
my $bar="This-Has-Dashes-HUP";
$bar=~s/.*-//;
print "$bar\n";
}
$SIG{'HUP'}=\&sighup;
system("while true ; do kill -HUP $$ ; sleep 1 ; done &");
$SIG{'HUP'}=\&sighup;
while (1) {
my $foo="This:Has:Colons";
$foo=~s/.*://;
if ($foo=~m/:/) {
print "BUG!!: $foo\n";
}
}
__END__
HUP
BUG!!: This:Has:Colons
HUP
HUP
HUP
BUG!!: This:Has:Colons
HUP
BUG!!: This:Has:Colons
HUP
BUG!!: This:Has:Colons
HUP
HUP
^C
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6:48 a.m.
New subject: [Bug 849703] Regular Expression matching in signal handler causes side-effects
Product: Fedora
https://bugzilla.redhat.com/show_bug.cgi?id=849703
Petr Pisar <ppisar(a)redhat.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
URL|http://permalink.gmane.org/ |https://rt.perl.org/rt3/Pub
|gmane.comp.lang.perl.perl5. |lic/Bug/Display.html?id=114
|porters/115209 |878
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6:14 a.m.
New subject: [Bug 849703] Regular Expression matching in signal handler causes side-effects
Product: Fedora
https://bugzilla.redhat.com/show_bug.cgi?id=849703
--- Comment #6 from Petr Pisar <ppisar(a)redhat.com> ---
Upstream has merged promising patch:
commit 47c9d59fcd27684d94480b806b8b6e001aac91cc
Author: Nicholas Clark <nick(a)ccl4.org>
Date: Sat Apr 14 15:51:33 2012 +0200
Remove PERL_ASYNC_CHECK() from Perl_leave_scope().
PERL_ASYNC_CHECK() was added to Perl_leave_scope() as part of commit
f410a2119920dd04, which moved signal dispatch from the runloop to
control flow ops, to mitigate nearly all of the speed cost of safe
signals.
The assumption was that scope exit was a safe place to dispatch signals.
However, this is not true, as parts of the regex engine call
leave_scope(), the regex engine stores some state in per-interpreter
variables, and code called within signal handlers can change these
values.
Hence remove the call to PERL_ASYNC_CHECK() from Perl_leave_scope(), and
add it explicitly in the various OPs which were relying on their call to
leave_scope() to dispatch any pending signals. Also add a
PERL_ASYNC_CHECK() to the exit of the runloop, which ensures signals
still dispatch from S_sortcv() and S_sortcv_stacked(), as well as
addressing one of the concerns in the commit message of
f410a2119920dd04:
Subtle bugs might remain - there might be constructions that enter
the runloop (where signals used to be dispatched) but don't contain
any PERL_ASYNC_CHECK() calls themselves.
Finally, move the PERL_ASYNC_CHECK(); added by that commit to pp_goto to
the end of the function, to be consistent with the positioning of all
other PERL_ASYNC_CHECK() calls - at the beginning or end of OP
functions, hence just before the return to or just after the call from
the runloop, and hence effectively at the same point as the previous
location of PERL_ASYNC_CHECK() in the runloop.
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7:13 a.m.
New subject: [Bug 849703] Regular Expression matching in signal handler causes side-effects
Product: Fedora
https://bugzilla.redhat.com/show_bug.cgi?id=849703
Petr Pisar <ppisar(a)redhat.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #619787|0 |1
is obsolete| |
--- Comment #7 from Petr Pisar <ppisar(a)redhat.com> ---
Created attachment 746137
--> https://bugzilla.redhat.com/attachment.cgi?id=746137&action=edit
Upstream fix ported to 5.16.3
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7:14 a.m.
New subject: [Bug 849703] Regular Expression matching in signal handler causes side-effects
Product: Fedora
https://bugzilla.redhat.com/show_bug.cgi?id=849703
--- Comment #8 from Petr Pisar <ppisar(a)redhat.com> ---
*** Bug 809796 has been marked as a duplicate of this bug. ***
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7:15 a.m.
New subject: [Bug 849703] Regular Expression matching in signal handler causes side-effects
Product: Fedora
https://bugzilla.redhat.com/show_bug.cgi?id=849703
Petr Pisar <ppisar(a)redhat.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|mmaslano(a)redhat.com |ppisar(a)redhat.com
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7:56 a.m.
New subject: [Bug 849703] Regular Expression matching in signal handler causes side-effects
Product: Fedora
https://bugzilla.redhat.com/show_bug.cgi?id=849703
Petr Pisar <ppisar(a)redhat.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |MODIFIED
Fixed In Version| |perl-5.16.3-272.fc20
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8:07 a.m.
New subject: [Bug 849703] Regular Expression matching in signal handler causes side-effects
Product: Fedora
https://bugzilla.redhat.com/show_bug.cgi?id=849703
--- Comment #9 from Fedora Update System <updates(a)fedoraproject.org> ---
perl-5.16.3-263.fc19 has been submitted as an update for Fedora 19.
https://admin.fedoraproject.org/updates/perl-5.16.3-263.fc19
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2:23 a.m.
New subject: [Bug 849703] Regular Expression matching in signal handler causes side-effects
Product: Fedora
https://bugzilla.redhat.com/show_bug.cgi?id=849703
--- Comment #10 from Fedora Update System <updates(a)fedoraproject.org> ---
perl-5.16.3-264.fc19 has been submitted as an update for Fedora 19.
https://admin.fedoraproject.org/updates/perl-5.16.3-264.fc19
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10:20 p.m.
New subject: [Bug 849703] Regular Expression matching in signal handler causes side-effects
https://bugzilla.redhat.com/show_bug.cgi?id=849703
--- Comment #11 from Fedora Update System <updates(a)fedoraproject.org> ---
perl-5.16.3-264.fc19 has been pushed to the Fedora 19 stable repository. If
problems still persist, please make note of it in this bug report.
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2:04 a.m.
New subject: [Bug 849703] Regular Expression matching in signal handler causes side-effects
https://bugzilla.redhat.com/show_bug.cgi?id=849703
--- Comment #12 from Fedora End Of Life <endoflife(a)fedoraproject.org> ---
This message is a reminder that Fedora 17 is nearing its end of life.
Approximately 4 (four) weeks from now Fedora will stop maintaining
and issuing updates for Fedora 17. It is Fedora's policy to close all
bug reports from releases that are no longer maintained. At that time
this bug will be closed as WONTFIX if it remains open with a Fedora
'version' of '17'.
Package Maintainer: If you wish for this bug to remain open because you
plan to fix it in a currently maintained version, simply change the 'version'
to a later Fedora version prior to Fedora 17's end of life.
Bug Reporter: Thank you for reporting this issue and we are sorry that
we may not be able to fix it before Fedora 17 is end of life. If you
would still like to see this bug fixed and are able to reproduce it
against a later version of Fedora, you are encouraged change the
'version' to a later Fedora version prior to Fedora 17's end of life.
Although we aim to fix as many bugs as possible during every release's
lifetime, sometimes those efforts are overtaken by events. Often a
more recent Fedora release includes newer upstream software that fixes
bugs or makes them obsolete.
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2:46 a.m.
New subject: [Bug 849703] Regular Expression matching in signal handler causes side-effects
https://bugzilla.redhat.com/show_bug.cgi?id=849703
--- Comment #13 from Jan Pazdziora <jpazdziora(a)redhat.com> ---
(In reply to Fedora Update System from comment #11)
perl-5.16.3-264.fc19 has been pushed to the Fedora 19 stable
repository. If
problems still persist, please make note of it in this bug report.
Nice. With perl-5.16.3-262.fc19.x86_64, I see the problem, with
perl-5.16.3-265.fc19.x86_64 it's done. I think you can NEXTRELEASE this
bugzilla.
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6:47 a.m.
New subject: [Bug 849703] Regular Expression matching in signal handler causes side-effects
https://bugzilla.redhat.com/show_bug.cgi?id=849703
Petr Pisar <ppisar(a)redhat.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Version|17 |18
--- Comment #14 from Petr Pisar <ppisar(a)redhat.com> ---
I want to push the fix into F18 too.
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6:54 a.m.
New subject: [Bug 849703] Regular Expression matching in signal handler causes side-effects
https://bugzilla.redhat.com/show_bug.cgi?id=849703
--- Comment #15 from Jan Pazdziora <jpazdziora(a)redhat.com> ---
(In reply to Petr Pisar from comment #14)
I want to push the fix into F18 too.
Ah, good for you. ;-)
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6:53 a.m.
New subject: [Bug 849703] Regular Expression matching in signal handler causes side-effects
https://bugzilla.redhat.com/show_bug.cgi?id=849703
Fedora Admin XMLRPC Client <fedora-admin-xmlrpc(a)redhat.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|ppisar(a)redhat.com |jplesnik(a)redhat.com
--- Comment #16 from Fedora Admin XMLRPC Client <fedora-admin-xmlrpc(a)redhat.com>
---
This package has changed ownership in the Fedora Package Database. Reassigning
to the new owner of this component.
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6:34 a.m.
New subject: [Bug 849703] Regular Expression matching in signal handler causes side-effects
https://bugzilla.redhat.com/show_bug.cgi?id=849703
Petr Pisar <ppisar(a)redhat.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|jplesnik(a)redhat.com |ppisar(a)redhat.com
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7:06 a.m.
New subject: [Bug 849703] Regular Expression matching in signal handler causes side-effects
https://bugzilla.redhat.com/show_bug.cgi?id=849703
--- Comment #17 from Fedora Update System <updates(a)fedoraproject.org> ---
perl-5.16.3-245.fc18 has been submitted as an update for Fedora 18.
https://admin.fedoraproject.org/updates/perl-5.16.3-245.fc18
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10:33 p.m.
New subject: [Bug 849703] Regular Expression matching in signal handler causes side-effects
https://bugzilla.redhat.com/show_bug.cgi?id=849703
--- Comment #18 from Fedora Update System <updates(a)fedoraproject.org> ---
perl-5.16.3-245.fc18 has been pushed to the Fedora 18 stable repository. If
problems still persist, please make note of it in this bug report.
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9:40 a.m.
New subject: [Bug 849703] Regular Expression matching in signal handler causes side-effects
https://bugzilla.redhat.com/show_bug.cgi?id=849703
--- Comment #19 from Fedora End Of Life <endoflife(a)fedoraproject.org> ---
This message is a reminder that Fedora 18 is nearing its end of life.
Approximately 4 (four) weeks from now Fedora will stop maintaining
and issuing updates for Fedora 18. It is Fedora's policy to close all
bug reports from releases that are no longer maintained. At that time
this bug will be closed as WONTFIX if it remains open with a Fedora
'version' of '18'.
Package Maintainer: If you wish for this bug to remain open because you
plan to fix it in a currently maintained version, simply change the 'version'
to a later Fedora version prior to Fedora 18's end of life.
Thank you for reporting this issue and we are sorry that we may not be
able to fix it before Fedora 18 is end of life. If you would still like
to see this bug fixed and are able to reproduce it against a later version
of Fedora, you are encouraged change the 'version' to a later Fedora
version prior to Fedora 18's end of life.
Although we aim to fix as many bugs as possible during every release's
lifetime, sometimes those efforts are overtaken by events. Often a
more recent Fedora release includes newer upstream software that fixes
bugs or makes them obsolete.
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10:20 a.m.
New subject: [Bug 849703] Regular Expression matching in signal handler causes side-effects
https://bugzilla.redhat.com/show_bug.cgi?id=849703
Petr Pisar <ppisar(a)redhat.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|MODIFIED |CLOSED
Resolution|--- |ERRATA
Last Closed| |2014-01-02 11:20:55
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