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[ID 20000306.004] unpack(NaN) big baddaboom

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From:
Ian Grigg
Date:
March 6, 2000 10:33
Subject:
[ID 20000306.004] unpack(NaN) big baddaboom
Message ID:
200003061831.OAA74965@systemics.com

This is a bug report for perl from iang@systemics.com,
generated with the help of perlbug 1.26 running under perl 5.00503.


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

Running following program causes "Floating point exception" on
FreeBSD 3.2-STABLE *and* 4.0-CURRENT #0: Tue Feb 29 02:11:52 AST 2000
(but not on Linux "2.3.44 #12 SMP") (all 5.00503)

===8<======8<======8<======8<====
#!/usr/bin/perl

my $packed = "\0\0\xc0\x7f";
print STDERR "len: ", length($packed), " bytes: ", unpack("H*", $packed), "\n";
my $float = unpack("f", $packed);
print STDERR "float done\n";
print STDERR "float: $float\n";

exit 0;
===8<======8<======8<======8<====
hayek$ ./moo.pl
len: 4 bytes: 0000c07f
float done
Floating point exception
hayek$ echo $?
136
hayek$ 
===8<======8<======8<======8<====


[Please do not change anything below this line]
-----------------------------------------------------------------

---
This perlbug was built using Perl 5.00502 - Mon Oct 26 16:01:51 AST 1998
It is being executed now by  Perl 5.00503 - $Date: 1999/05/05 19:42:40 $.

Site configuration information for perl 5.00503:

Configured by markm at $Date: 1999/05/05 19:42:40 $.

Summary of my perl5 (5.0 patchlevel 5 subversion 3) configuration:
  Platform:
    osname=freebsd, osvers=4.0-current, archname=i386-freebsd
    uname='freebsd freefall.freebsd.org 4.0-current freebsd 4.0-current #0: $Date: 1999/05/05 19:42:40 $'
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=undef useperlio=undef d_sfio=undef
  Compiler:
    cc='cc', optimize='undef', gccversion=egcs-2.91.66 19990314 (egcs-1.1.2 release)
    cppflags=''
    ccflags =''
    stdchar='char', d_stdstdio=undef, usevfork=true
    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 ='-Wl,-E'
    libpth=/usr/lib
    libs=-lm -lc -lcrypt
    libc=/usr/lib/libc.so, so=so, useshrplib=true, libperl=libperl.so.3
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags=' '
    cccdlflags='-DPIC -fpic', lddlflags='-shared'

Locally applied patches:
    

---
@INC for perl 5.00503:
    /data/ricardo/perl
    /home/iang/src/hayek/ricardo/blib/lib
    /usr/libdata/perl/5.00503/mach
    /usr/libdata/perl/5.00503
    /usr/local/lib/perl5/site_perl/5.005/i386-freebsd
    /usr/local/lib/perl5/site_perl/5.005
    .

---
Environment for perl 5.00503:
    HOME=/home/iang
    LANG (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/home/iang/src/hayek/market/cmd:/home/iang/src/hayek/market/bin:/data/ricardo/perl/cmd:/home/iang/src/hayek/ricardo/cmd:/home/iang/bin:/home/iang/cmd:/usr/local/bin:/bin:/usr/bin:/usr/X11R6/bin:/usr/local/java/bin:/sbin:/usr/sbin:/usr/local/sbin
    PERLLIB=/data/ricardo/perl:/home/iang/src/hayek/ricardo/blib/lib
    PERL_BADLANG (unset)
    SHELL=/usr/local/bin/bash

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