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Re: [perl #114878] Regular Expression matching in signal handlercauses side-effects
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From:
Ricardo Signes
Date:
May 8, 2013 15:02
Subject:
Re: [perl #114878] Regular Expression matching in signal handlercauses side-effects
Message ID:
20130508150144.GA29691@cancer.codesimply.com
* Dave Mitchell <davem@iabyn.com> [2013-05-08T09:21:48]
> Just to confirm what you are saying: that the OP's bug report code on
> your *blead* causes the panic shown above?
Yes.
Karl and I were playing with variants on this problem yesterday evening.
If I run the program included in the ticket and send it HUP a few times, I see:
HUP
HUP
panic: sv_chop ptr=7fcb23c011d9, start=7fcb23c05b20, end=7fcb23c05b30 at test line 13.
This is avoided if I drop the s/// from the handler or the loop, and if I add a
sleep to the loop. Dropping the m// does not seem to matter. In other words,
it seems quite likely to me that "if we leave a s/// to enter a handler that
also does a s///, panic ensues."
This is perl 5, version 18, subversion 0 (v5.18.0 (v5.17.11-110-g9d055c6)) built for darwin-2level
That's why I asked about Nick's fix: to get this panic address.
Summary of my perl5 (revision 5 version 18 subversion 0) configuration:
Commit id: 9d055c6596c43e1078ddc578f9f2db2e49e8b167
Platform:
osname=darwin, osvers=12.3.0, archname=darwin-2level
uname='darwin walrus.local 12.3.0 darwin kernel version 12.3.0: sun jan 6 22:37:10 pst 2013; root:xnu-2050.22.13~1release_x86_64 x86_64 '
config_args='-de -Dprefix=/Users/rjbs/perl5/perlbrew/perls/18.0-RC0 -Dusedevel -Aeval:scriptdir=/Users/rjbs/perl5/perlbrew/perls/18.0-RC0/bin'
hint=recommended, useposix=true, d_sigaction=define
useithreads=undef, usemultiplicity=undef
useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
use64bitint=define, use64bitall=define, uselongdouble=undef
usemymalloc=n, bincompat5005=undef
Compiler:
cc='cc', ccflags ='-fno-common -DPERL_DARWIN -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include -I/opt/local/include',
optimize='-O3',
cppflags='-fno-common -DPERL_DARWIN -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include -I/opt/local/include'
ccversion='', gccversion='4.2.1 Compatible Apple Clang 4.0 ((tags/Apple/clang-421.0.57))', gccosandvers=''
intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678
d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
ivtype='long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
alignbytes=8, prototype=define
Linker and Libraries:
ld='env MACOSX_DEPLOYMENT_TARGET=10.3 cc', ldflags =' -fstack-protector -L/usr/local/lib -L/opt/local/lib'
libpth=/usr/local/lib /opt/local/lib /usr/lib
libs=-lgdbm -ldbm -ldl -lm -lutil -lc
perllibs=-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=' -bundle -undefined dynamic_lookup -L/usr/local/lib -L/opt/local/lib -fstack-protector'
Characteristics of this binary (from libperl):
Compile-time options: HAS_TIMES PERLIO_LAYERS PERL_DONT_CREATE_GVSV
PERL_MALLOC_WRAP PERL_PRESERVE_IVUV PERL_SAWAMPERSAND
PERL_USE_DEVEL USE_64_BIT_ALL USE_64_BIT_INT
USE_LARGE_FILES USE_LOCALE USE_LOCALE_COLLATE
USE_LOCALE_CTYPE USE_LOCALE_NUMERIC USE_PERLIO
USE_PERL_ATOF
Locally applied patches:
RC0
Built under darwin
Compiled at May 7 2013 10:45:52
%ENV:
PERLBREW_BASHRC_VERSION="0.61"
PERLBREW_HOME="/Users/rjbs/.perlbrew"
PERLBREW_MANPATH="/Users/rjbs/perl5/perlbrew/perls/18.0-RC0/man"
PERLBREW_PATH="/Users/rjbs/perl5/perlbrew/bin:/Users/rjbs/perl5/perlbrew/perls/18.0-RC0/bin"
PERLBREW_PERL="18.0-RC0"
PERLBREW_ROOT="/Users/rjbs/perl5/perlbrew"
PERLBREW_VERSION="0.61"
PERLDOC="-n/opt/local/bin/groff"
PERL_AUTOINSTALL="--skipdeps"
PERL_MAILERS="sendmail:/Users/rjbs/bin/sendmail"
@INC:
/Users/rjbs/perl5/perlbrew/perls/18.0-RC0/lib/site_perl/5.18.0/darwin-2level
/Users/rjbs/perl5/perlbrew/perls/18.0-RC0/lib/site_perl/5.18.0
/Users/rjbs/perl5/perlbrew/perls/18.0-RC0/lib/5.18.0/darwin-2level
/Users/rjbs/perl5/perlbrew/perls/18.0-RC0/lib/5.18.0
.
--
rjbs
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