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[perl #42029] segfault on readline without argument

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From:
Zsbán Ambrus
Date:
March 24, 2007 03:20
Subject:
[perl #42029] segfault on readline without argument
Message ID:
rt-3.6.HEAD-30201-1174666473-1366.42029-75-0@perl.org
# New Ticket Created by  "Zsbán Ambrus" 
# Please include the string:  [perl #42029]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=42029 >


This is a bug report for perl from ambrus@math.bme.hu,
generated with the help of perlbug 1.35 running under perl v5.8.8.


-----------------------------------------------------------------
[Please enter your report here]


The oneliner 'warn readpipe;' causes a segmentation fault on my
interpreter.  Here's the exact command and output, together with other
variants (note readpipe versus readline):

    $ perl -we 'warn readpipe;'
    Use of uninitialized value in quoted execution (``, qx) at -e line 1.
    Segmentation fault
    $ perl -we 'warn readline;'
    Use of uninitialized value in <HANDLE> at -e line 1.
    readline() on unopened filehandle at -e line 1.
    Segmentation fault
    $ perl -we 'warn readpipe();'
    Use of uninitialized value in quoted execution (``, qx) at -e line 1.
    Segmentation fault
    $ perl -we 'warn readline();'
    Use of uninitialized value in <HANDLE> at -e line 1.
    readline() on unopened filehandle at -e line 1.
    Segmentation fault

These outputs are from the perl version described by perlbug, that is,
v5.8.8 built for i686-linux.  The system is i686-linux debian sarge
and this perl is a custom build.

I could also reproduce the segfault with the system perl on an linux-amd64
debian etch machine (v5.8.8 built for x86_64-linux-gnu-thread-multi).
Anno from perlmonks reports in the chatterbox that he could reproduce
the segfault with bleadperl.

Write me if you need any more info.

Thanks,
Ambrus


[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
    category=core
    severity=medium
---
Site configuration information for perl v5.8.8:

Configured by ambrus at Mon May 22 23:16:27 CEST 2006.

Summary of my perl5 (revision 5 version 8 subversion 8) configuration:
  Platform:
    osname=linux, osvers=2.4.27-3-686, archname=i686-linux
    uname='linux king 2.4.27-3-686 #1 wed feb 8 12:40:33 utc 2006 i686
gnulinux '
    config_args=''
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=undef use5005threads=undef useithreads=undef
usemultiplicity=undef
    useperlio=define d_sfio=undef uselargefiles=define usesocks=undef
    use64bitint=undef use64bitall=undef uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='cc', ccflags ='-fno-strict-aliasing -pipe -I/usr/local/include
-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-O2',
    cppflags='-fno-strict-aliasing -pipe -I/usr/local/include'
    ccversion='', gccversion='3.3.5 (Debian 1:3.3.5-13)', 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 -ldl -lm -lcrypt -lutil -lc
    perllibs=-lnsl -ldl -lm -lcrypt -lutil -lc
    libc=/lib/libc-2.3.2.so, so=so, useshrplib=false, libperl=libperl.a
    gnulibc_version='2.3.2'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
    cccdlflags='-fpic', lddlflags='-shared -L/usr/local/lib'

Locally applied patches:


---
@INC for perl v5.8.8:
    /usr/local/lib/perl5/5.8.8/i686-linux
    /usr/local/lib/perl5/5.8.8
    /usr/local/lib/perl5/site_perl/5.8.8/i686-linux
    /usr/local/lib/perl5/site_perl/5.8.8
    /usr/local/lib/perl5/site_perl
    .

---
Environment for perl v5.8.8:
    HOME=/home/ambrus
    LANG (unset)
    LANGUAGE=en_HU:en_US:en_GB:en
    LC_CTYPE=hu_HU
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/home/ambrus/local/bin:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/games
    PERL_BADLANG (unset)
    SHELL=/bin/bash


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