Bleadperl v5.21.4-88-ga51d618 breaks DCONWAY/Regexp-Grammars-1.036.tar.gz #14129

p5pRT · 2014-10-03T06:19:01Z

Migrated from rt.perl.org#122890 (status was 'resolved')

Searchable as RT122890$

p5pRT · 2014-10-03T06:19:01Z

From @andk

git bisect

commit a51d618
Author: Yves Orton <demerphq@gmail.com>
Date: Fri Sep 19 19:57:34 2014 +0200

rt 122283 - do not recurse into GOSUB/GOSTART when not SCF_DO_SUBSTR

sample fail report

http://www.cpantesters.org/cpan/report/98605662-4578-11e4-966f-9b262c6f0924

perl -V

Summary of my perl5 (revision 5 version 21 subversion 5) configuration:
Commit id: a83034f
Platform:
osname=linux, osvers=3.16-1-amd64, archname=x86_64-linux-thread-multi-ld
uname='linux k83 3.16-1-amd64 #1 smp debian 3.16.2-2 (2014-09-08) x86_64 gnulinux '
config_args='-Dprefix=/home/sand/src/perl/repoperls/installed-perls/perl/v5.21.4-101-ga83034f/a2da -Dmyhostname=k83 -Dinstallusrbinperl=n -Uversiononly -Dusedevel -des -Ui_db -Duseithreads -Duselongdouble -DDEBUGGING=-g'
hint=recommended, useposix=true, d_sigaction=define
useithreads=define, usemultiplicity=define
use64bitint=define, use64bitall=define, uselongdouble=define
usemymalloc=n, bincompat5005=undef
Compiler:
cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -D_FORTIFY_SOURCE=2',
optimize='-O2 -g',
cppflags='-D_REENTRANT -D_GNU_SOURCE -fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include'
ccversion='', gccversion='4.9.1', gccosandvers=''
intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678
d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16, longdblkind=3
ivtype='long', ivsize=8, nvtype='long double', nvsize=16, Off_t='off_t', lseeksize=8
alignbytes=16, prototype=define
Linker and Libraries:
ld='cc', ldflags =' -fstack-protector-strong -L/usr/local/lib'
libpth=/usr/local/lib /usr/lib/gcc/x86_64-linux-gnu/4.9/include-fixed /usr/include/x86_64-linux-gnu /usr/lib /lib/x86_64-linux-gnu /lib/../lib /usr/lib/x86_64-linux-gnu /usr/lib/../lib /lib
libs=-lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lpthread -lc -lgdbm_compat
perllibs=-lnsl -ldl -lm -lcrypt -lutil -lpthread -lc
libc=libc-2.19.so, so=so, useshrplib=false, libperl=libperl.a
gnulibc_version='2.19'
Dynamic Linking:
dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
cccdlflags='-fPIC', lddlflags='-shared -O2 -g -L/usr/local/lib -fstack-protector-strong'

Characteristics of this binary (from libperl):
Compile-time options: HAS_TIMES MULTIPLICITY PERLIO_LAYERS
PERL_DONT_CREATE_GVSV
PERL_HASH_FUNC_ONE_AT_A_TIME_HARD
PERL_IMPLICIT_CONTEXT PERL_MALLOC_WRAP
PERL_NEW_COPY_ON_WRITE PERL_PRESERVE_IVUV
PERL_USE_DEVEL 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_LONG_DOUBLE
USE_PERLIO USE_PERL_ATOF USE_REENTRANT_API
Built under linux
Compiled at Sep 25 2014 22:31:36
%ENV:
PERL5LIB=""
PERL5OPT=""
PERL5_CPANPLUS_IS_RUNNING="21904"
PERL5_CPAN_IS_RUNNING="21904"
PERL_MM_USE_DEFAULT="1"
@INC:
/home/sand/src/perl/repoperls/installed-perls/perl/v5.21.4-101-ga83034f/a2da/lib/site_perl/5.21.5/x86_64-linux-thread-multi-ld
/home/sand/src/perl/repoperls/installed-perls/perl/v5.21.4-101-ga83034f/a2da/lib/site_perl/5.21.5
/home/sand/src/perl/repoperls/installed-perls/perl/v5.21.4-101-ga83034f/a2da/lib/5.21.5/x86_64-linux-thread-multi-ld
/home/sand/src/perl/repoperls/installed-perls/perl/v5.21.4-101-ga83034f/a2da/lib/5.21.5
.
--
andreas

p5pRT · 2014-10-04T05:03:48Z

From @cpansprout

On Thu Oct 02 23:19:01 2014, andreas.koenig.7os6VVqR@franz.ak.mind.de wrote:

git bisect
----------
commit a51d618
Author: Yves Orton <demerphq@gmail.com>
Date: Fri Sep 19 19:57:34 2014 +0200

rt 122283 - do not recurse into GOSUB/GOSTART when not SCF_DO_SUBSTR

sample fail report
------------------
http://www.cpantesters.org/cpan/report/98605662-4578-11e4-966f-
9b262c6f0924

Reduced case:

print scalar '7% solution' =~
m/(?: (?&solution) | % ) \Z
(?(DEFINE) (?<solution>7\%\ solution) )
/msx, "\n";

Output in 5.21.4:
1

Output in blead is an empty line.

--

Father Chrysostomos

p5pRT · 2014-10-04T05:03:48Z

The RT System itself - Status changed from 'new' to 'open'

p5pRT · 2014-10-05T01:58:37Z

From @cpansprout

On Fri Oct 03 22:03:48 2014, sprout wrote:

On Thu Oct 02 23:19:01 2014, andreas.koenig.7os6VVqR@franz.ak.mind.de wrote:

git bisect
----------
commit a51d618
Author: Yves Orton <demerphq@gmail.com>
Date: Fri Sep 19 19:57:34 2014 +0200

rt 122283 - do not recurse into GOSUB/GOSTART when not SCF_DO_SUBSTR

sample fail report
------------------
http://www.cpantesters.org/cpan/report/98605662-4578-11e4-966f-
9b262c6f0924

Reduced case:

print scalar '7% solution' =~
m/(?: (?&solution) | % ) \Z
(?(DEFINE) (?<solution>7\%\ solution) )
/msx, "\n";

Output in 5.21.4:
1

Output in blead is an empty line.

More info: The anchored-end optimisation determines that the pattern cannot start earlier than position 10 (1 character before the end of the string. Apparently it sees (?&solution) as having zero length, instead of potentially infinite length. If study_chunk (or whatever is responsible) is not going to follow (?&...) recursively, it at least needs to note that max-length optimisations need to be skipped. How does one go about that?

Compiling REx "(?: (?&solution) | %% ) \Z%n (?(DEFINE) (?<solution>7\%%\"...
rarest char
at 0
Final program:
1: BRANCH (5)
2: GOSUB1[+12] (9)
5: BRANCH (FAIL)
6: EXACT <%> (9)
8: TAIL (9)
9: SEOL (10)
10: DEFINEP (12)
12: IFTHEN (25)
14: OPEN1 'solution' (16)
16: EXACT <7% solution> (20)
20: CLOSE1 'solution' (25)
22: LONGJMP (24)
24: TAIL (25)
25: END (0)
floating ""$ at 0..1 (checking floating) minlen 0
Enabling $` $& $' support (0x7).

EXECUTING...

Matching REx "(?: (?&solution) | %% ) \Z%n (?(DEFINE) (?<solution>7\%%\"... against "7%% solution"
Intuit: trying to determine minimum start position...
Found floating substr ""$ at offset 11...
(multiline anchor test skipped)
try at offset...
Intuit: Successfully guessed: match at offset 10
10 <7%% solutio> <n> | 1:BRANCH(5)

etc.

--

Father Chrysostomos

p5pRT · 2014-10-05T09:48:32Z

From @demerphq

On 5 October 2014 03:58, Father Chrysostomos via RT <
perlbug-followup@perl.org> wrote:

On Fri Oct 03 22:03:48 2014, sprout wrote:

On Thu Oct 02 23:19:01 2014, andreas.koenig.7os6VVqR@franz.ak.mind.de
wrote:

git bisect
----------
commit a51d618
Author: Yves Orton <demerphq@gmail.com>
Date: Fri Sep 19 19:57:34 2014 +0200

rt 122283 - do not recurse into GOSUB/GOSTART when not SCF_DO_SUBSTR

sample fail report
------------------
http://www.cpantesters.org/cpan/report/98605662-4578-11e4-966f-
9b262c6f0924

Reduced case:

print scalar '7% solution' =~
m/(?: (?&solution) | % ) \Z
(?(DEFINE) (?<solution>7\%\ solution) )
/msx, "\n";

Output in 5.21.4:
1

Output in blead is an empty line.

More info: The anchored-end optimisation determines that the pattern
cannot start earlier than position 10 (1 character before the end of the
string. Apparently it sees (?&solution) as having zero length, instead of
potentially infinite length. If study_chunk (or whatever is responsible)
is not going to follow (?&...) recursively, it at least needs to note that
max-length optimisations need to be skipped. How does one go about that?

I don't think it is that simple. There are a bunch of subtle behaviors
interacting here in a suboptimal way.

I will try to find time for this this week. Your reduction to simpler case
makes my life a lot easier, thanks.

For now please leave this to me.

Yves

--
perl -Mre=debug -e "/just|another|perl|hacker/"

p5pRT · 2014-10-13T06:41:03Z

From @demerphq

On 5 October 2014 11:47, demerphq <demerphq@gmail.com> wrote:

On 5 October 2014 03:58, Father Chrysostomos via RT <
perlbug-followup@perl.org> wrote:

On Fri Oct 03 22:03:48 2014, sprout wrote:

On Thu Oct 02 23:19:01 2014, andreas.koenig.7os6VVqR@franz.ak.mind.de
wrote:

git bisect
----------
commit a51d618
Author: Yves Orton <demerphq@gmail.com>
Date: Fri Sep 19 19:57:34 2014 +0200

rt 122283 - do not recurse into GOSUB/GOSTART when not SCF_DO_SUBSTR

sample fail report
------------------
http://www.cpantesters.org/cpan/report/98605662-4578-11e4-966f-
9b262c6f0924

Reduced case:

print scalar '7% solution' =~
m/(?: (?&solution) | % ) \Z
(?(DEFINE) (?<solution>7\%\ solution) )
/msx, "\n";

Output in 5.21.4:
1

Output in blead is an empty line.

More info: The anchored-end optimisation determines that the pattern
cannot start earlier than position 10 (1 character before the end of the
string. Apparently it sees (?&solution) as having zero length, instead of
potentially infinite length. If study_chunk (or whatever is responsible)
is not going to follow (?&...) recursively, it at least needs to note that
max-length optimisations need to be skipped. How does one go about that?

I don't think it is that simple. There are a bunch of subtle behaviors
interacting here in a suboptimal way.

I will try to find time for this this week. Your reduction to simpler case
makes my life a lot easier, thanks.

For now please leave this to me.

For the record I put some hours into this over the weekend. No final result
yet, but I have fixed the memory leaks. The rt 122283 pattern now runs to
finish in 372 minutes. :-)

Yves

--
perl -Mre=debug -e "/just|another|perl|hacker/"

p5pRT · 2014-10-19T07:52:21Z

From @andk

also affected:
SPROUT/JE-0.065.tar.gz
http://www.cpantesters.org/cpan/report/785cae16-54f9-11e4-b101-b4d49ed67017
--
andreas

p5pRT · 2014-10-20T06:45:50Z

From @demerphq

On 19 October 2014 09:51, Andreas Koenig <
andreas.koenig.7os6VVqR@franz.ak.mind.de> wrote:

also affected:
SPROUT/JE-0.065.tar.gz
http://www.cpantesters.org/cpan/report/785cae16-54f9-11e4-b101-b4d49ed67017

Last night I pushed a patch sequence which hopefully fixes this and RT #
122283.

If that fixes these modules as well then I consider this issue finally
properly closed.

Yves

--
perl -Mre=debug -e "/just|another|perl|hacker/"

p5pRT · 2014-10-20T18:17:08Z

From @andk

On Mon, 20 Oct 2014 08:45:15 +0200, demerphq <demerphq@gmail.com> said:

> On 19 October 2014 09:51, Andreas Koenig <
> andreas.koenig.7os6VVqR@franz.ak.mind.de> wrote:

> also affected:
> SPROUT/JE-0.065.tar.gz
> http://www.cpantesters.org/cpan/report/785cae16-54f9-11e4-b101-b4d49ed67017

> Last night I pushed a patch sequence which hopefully fixes this and RT #
> 122283.

> If that fixes these modules as well then I consider this issue finally properly
> closed.

With v5.21.4-553-gf6f22b1:

DCONWAY/Regexp-Grammars-1.036.tar.gz
./Build test -- OK

SPROUT/JE-0.065.tar.gz
/usr/bin/make test -- OK

Thank You && Cheers!
--
andreas

p5pRT · 2014-10-20T20:37:47Z

From @demerphq

On 20 October 2014 20:16, Andreas Koenig <
andreas.koenig.7os6VVqR@franz.ak.mind.de> wrote:

On Mon, 20 Oct 2014 08:45:15 +0200, demerphq <demerphq@gmail.com>
said:

On 19 October 2014 09:51, Andreas Koenig <
andreas.koenig.7os6VVqR@franz.ak.mind.de> wrote:
also affected&#8203;:
SPROUT/JE\-0\.065\.tar\.gz
http://www.cpantesters.org/cpan/report/785cae16-54f9-11e4-b101-b4d49ed67017

Last night I pushed a patch sequence which hopefully fixes this and RT
#
122283.

If that fixes these modules as well then I consider this issue finally
properly
closed.

With v5.21.4-553-gf6f22b1:

DCONWAY/Regexp-Grammars-1.036.tar.gz
./Build test -- OK

SPROUT/JE-0.065.tar.gz
/usr/bin/make test -- OK

Thank You && Cheers!

And thank you for your CPAN reports. :-)

cheers,
Yves

--
perl -Mre=debug -e "/just|another|perl|hacker/"

p5pRT · 2014-10-20T20:52:37Z

@cpansprout - Status changed from 'open' to 'resolved'

p5pRT closed this as completed Oct 20, 2014

p5pRT added the Severity Low label Oct 19, 2019

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Bleadperl v5.21.4-88-ga51d618 breaks DCONWAY/Regexp-Grammars-1.036.tar.gz #14129

Bleadperl v5.21.4-88-ga51d618 breaks DCONWAY/Regexp-Grammars-1.036.tar.gz #14129

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Bleadperl v5.21.4-88-ga51d618 breaks DCONWAY/Regexp-Grammars-1.036.tar.gz #14129

Bleadperl v5.21.4-88-ga51d618 breaks DCONWAY/Regexp-Grammars-1.036.tar.gz #14129

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