[perl #21347] segfault in UNIVERSAL::AUTOLOAD

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[perl #21347] segfault in UNIVERSAL::AUTOLOAD

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From:

Stas Bekman

Date:

February 23, 2003 17:11

Subject:

[perl #21347] segfault in UNIVERSAL::AUTOLOAD

Message ID:

rt-21347-52649.16.2520002571814@bugs6.perl.org

# New Ticket Created by  Stas Bekman 
# Please include the string:  [perl #21347]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org/rt2/Ticket/Display.html?id=21347 >



This is a bug report for perl from stas@hope.stason.org,
generated with the help of perlbug 1.34 running under perl v5.9.0.


-----------------------------------------------------------------

% perl-blead -lwe 'sub UNIVERSAL::AUTOLOAD {qr//}; A->v()'
Segmentation fault (core dumped)

The segfault happens with blead, 5.6.x, 5.005, but not with 5.8

% perl-5.8.0 -lwe 'sub UNIVERSAL::AUTOLOAD {qr//}; A->v()'
Can't locate object method "v" via package "A" (perhaps you forgot to load
"A"?) at -e line 1.

the backtrace with bleadperl is:

#0  0x4003cf2b in Perl_gv_fetchpv (nambeg=0xbf800150 "Regexp::", add=1,
     sv_type=11) at gv.c:628
#1  0x4003cdfa in Perl_gv_stashpvn (name=0x4013758c "Regexp", namelen=8,
     create=1) at gv.c:594
#2  0x4003cd50 in Perl_gv_stashpv (name=0x4013758c "Regexp", create=1)
     at gv.c:575
#3  0x400b8836 in Perl_newSVrv (rv=0x9b16398, classname=0x4013758c
"Regexp")
     at sv.c:7671
#4  0x400a24ad in Perl_pp_qr () at pp_hot.c:1140
#5  0x4008828a in Perl_runops_debug () at dump.c:1422
#6  0x400372e5 in S_call_body (myop=0xbf800430, is_eval=0) at perl.c:1913
#7  0x40036f0a in Perl_call_sv (sv=0x805a5a0, flags=150) at perl.c:1831
#8  0x400b3371 in Perl_sv_clear (sv=0x9b16380) at sv.c:5191
#9  0x400b3beb in Perl_sv_free (sv=0x9b16380) at sv.c:5441
#10 0x400b379f in Perl_sv_clear (sv=0x9b16374) at sv.c:5276
#11 0x400b3beb in Perl_sv_free (sv=0x9b16374) at sv.c:5441
#12 0x400cf276 in Perl_free_tmps () at scope.c:181
#13 0x4003723c in Perl_call_sv (sv=0x805a5a0, flags=150) at perl.c:1884
#14 0x400b3371 in Perl_sv_clear (sv=0x9b1635c) at sv.c:5191
#15 0x400b3beb in Perl_sv_free (sv=0x9b1635c) at sv.c:5441
#16 0x400b379f in Perl_sv_clear (sv=0x9b16350) at sv.c:5276
#17 0x400b3beb in Perl_sv_free (sv=0x9b16350) at sv.c:5441

the frames #12-17 are then continued for thousand of lines.

This is definitely a deep recursion, which doesn't get caught by Perl.

[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
     category=core
     severity=low
---
Site configuration information for perl v5.9.0:

Configured by stas at Mon Feb 17 13:07:33 EST 2003.

Summary of my perl5 (revision 5.0 version 9 subversion 0 patch 18699) 
configuration:
   Platform:
     osname=linux, osvers=2.4.19-16mdksmp, archname=i686-linux-multi
     uname='linux hope.stason.org 2.4.19-16mdksmp #1 smp fri sep 20 16:08:37 
cest 2002 i686 unknown unknown gnulinux '
     config_args='-des -Dprefix=/home/stas/perl/blead-multi -Dusemultiplicity 
-Doptimize=-g -Duseshrplib -Dusedevel'
     hint=recommended, useposix=true, d_sigaction=define
     usethreads=undef useithreads=undef usemultiplicity=define
     useperlio=define d_sfio=undef uselargefiles=define usesocks=undef
     use64bitint=undef use64bitall=undef uselongdouble=undef
     usemymalloc=n, bincompat5005=undef
   Compiler:
     cc='cc', ccflags ='-DDEBUGGING -fno-strict-aliasing -D_LARGEFILE_SOURCE 
-D_FILE_OFFSET_BITS=64 -I/usr/include/gdbm',
     optimize='-g',
     cppflags='-DDEBUGGING -fno-strict-aliasing -I/usr/include/gdbm'
     ccversion='', gccversion='3.2 (Mandrake Linux 9.0 3.2-1mdk)', gccosandvers=''
     intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
     d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
     ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', 
lseeksize=8
     alignbytes=4, prototype=define
   Linker and Libraries:
     ld='cc', ldflags =' -L/usr/local/lib'
     libpth=/usr/local/lib /lib /usr/lib
     libs=-lnsl -lgdbm -ldb -ldl -lm -lc -lcrypt -lutil -lrt
     perllibs=-lnsl -ldl -lm -lc -lcrypt -lutil -lrt
     libc=/lib/libc-2.3.1.so, so=so, useshrplib=true, libperl=libperl.so
     gnulibc_version='2.3.1'
   Dynamic Linking:
     dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-rdynamic 
-Wl,-rpath,/home/stas/perl/blead-multi/lib/5.9.0/i686-linux-multi/CORE'
     cccdlflags='-fpic', lddlflags='-shared -L/usr/local/lib'

Locally applied patches:
     DEVEL18374

---
@INC for perl v5.9.0:
     /home/stas/perl/blead-multi/lib/5.9.0/i686-linux-multi
     /home/stas/perl/blead-multi/lib/5.9.0
     /home/stas/perl/blead-multi/lib/site_perl/5.9.0/i686-linux-multi
     /home/stas/perl/blead-multi/lib/site_perl/5.9.0
     /home/stas/perl/blead-multi/lib/site_perl
     .

---
Environment for perl v5.9.0:
     HOME=/home/stas
     LANG=en_US
     LANGUAGE=en_US:en
     LC_COLLATE=en_US
     LC_CTYPE=en_US
     LC_MESSAGES=en_US
     LC_MONETARY=en_US
     LC_NUMERIC=en_US
     LC_TIME=en_US
     LD_LIBRARY_PATH=/usr/X11R6/lib:/usr/X11R6/lib/modules
     LOGDIR (unset)
 
PATH=/usr//bin:/bin:/usr/bin:.:/usr/local/bin:/usr/X11R6/bin:/usr/games:/home/stas/bin:/home/stas/bin:/usr/local/bin:/usr/X11R6/bin:/usr/java/j2re1.4.0/bin/
     PERL_BADLANG (unset)
     SHELL=/bin/tcsh

__________________________________________________________________
Stas Bekman            JAm_pH ------> Just Another mod_perl Hacker
http://stason.org/     mod_perl Guide ---> http://perl.apache.org
mailto:stas@stason.org http://use.perl.org http://apacheweek.com
http://modperlbook.org http://apache.org   http://ticketmaster.com

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