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[ID 20010730.021] Perl crashes with certain write() formats.

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From:
benjamin
Date:
July 30, 2001 17:30
Subject:
[ID 20010730.021] Perl crashes with certain write() formats.
Message ID:
20010731003004.9748.qmail@plant.student.utwente.nl
This is a bug report for perl from goldbb2@earthlink.net,
generated with the help of perlbug 1.28 running under perl 5.00503.


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

The following code causes perl to generate a core dump
with perl 5.00503 and 5.6.0:

sub formtest {
  my $cnt = shift;
  my $fmt = "format STDOUT =\n" . ("^" x $cnt) . "\n" .
  join(",", map "\$a{$_}", 1..$cnt) . "\n.\n";
  print STDERR $fmt;
  eval $fmt;
  write; # it's write, not eval, which dies.
}

my $i = $ARGV[0]+0;
formtest( $i++ ) while(1);
__END__

I get the core dump when $i is 7, though IIRC someone
on c.l.p.misc said that on sun, it goes up to 111
before crashing.  You can give an argument to the script
to skip to a higher number.

I consider this "medium" severity because it's not
something I use, but was discovered by someone else,
and I believe [but may be mistaken] that he found a
workaround of some sort for it.

[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
    category=core
    severity=medium
---
This perlbug was built using Perl v5.6.0 - Sat Mar 24 01:02:16 CET 2001
It is being executed now by  Perl 5.00503 - Wed Feb  2 15:34:50 EST 2000.

Site configuration information for perl 5.00503:

Configured by root at Wed Feb  2 15:34:50 EST 2000.

Summary of my perl5 (5.0 patchlevel 5 subversion 3) configuration:
  Platform:
    osname=linux, osvers=2.2.5-22smp, archname=i386-linux
    uname='linux porky.devel.redhat.com 2.2.5-22smp #1 smp wed jun 2 09:11:51 edt 1999 i686 unknown '
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=undef useperlio=undef d_sfio=undef
  Compiler:
    cc='cc', optimize='-O2 -m486 -fno-strength-reduce', gccversion=egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)
    cppflags='-Dbool=char -DHAS_BOOL -I/usr/local/include'
    ccflags ='-Dbool=char -DHAS_BOOL -I/usr/local/include'
    stdchar='char', d_stdstdio=undef, usevfork=false
    intsize=4, longsize=4, ptrsize=4, doublesize=8
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
    alignbytes=4, usemymalloc=n, prototype=define
  Linker and Libraries:
    ld='cc', ldflags =' -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib
    libs=-lnsl -ldl -lm -lc -lposix -lcrypt
    libc=, so=so, useshrplib=false, libperl=libperl.a
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-rdynamic'
    cccdlflags='-fpic', lddlflags='-shared -L/usr/local/lib'

Locally applied patches:
    

---
@INC for perl 5.00503:
    /usr/lib/perl5/5.00503/i386-linux
    /usr/lib/perl5/5.00503
    /usr/lib/perl5/site_perl/5.005/i386-linux
    /usr/lib/perl5/site_perl/5.005
    .

---
Environment for perl 5.00503:
    HOME=/home/benjamin
    LANG=en_US
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/home/benjamin/bin:/usr/local/bin:/bin:/usr/bin:/usr/X11R6/bin
    PERL_BADLANG (unset)
    SHELL=/bin/bash


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