From markus@mnslaker.f9.co.uk

Two things are unexpected here​: the fact that Rakudo thinks $x is
an instance of class Timer, and the corrupted double-linked list.

Please let me know if there's more I can do to help characterise the
bug, or if I can report it in some more useful form.

Best regards,

Markus

msl@​edward​:~/perl/6$ ~/bin/perl6 -e 'my Any $x; ++$x; $x.say'
1
msl@​edward​:~/perl/6$ ~/bin/perl6 -e 'my $x = 0; ++$x; $x.say'
1
msl@​edward​:~/perl/6$ ~/bin/perl6 -e 'my $x; ++$x; $x.say'
increment() not implemented in class 'Timer'
current instr.​: 'prefix​:++' pc 17895 (src/builtins/op.pir​:60)
called from Sub '_block14' pc 69 (EVAL_9​:43)
called from Sub 'parrot;PCT;HLLCompiler;eval' pc 892 (src/PCT/HLLCompiler.pir​:508)
called from Sub 'parrot;PCT;HLLCompiler;command_line' pc 1436 (src/PCT/HLLCompiler.pir​:768)
called from Sub 'parrot;Perl6;Compiler;main' pc 19057 (perl6.pir​:162)
*** glibc detected *** /home/msl/bin/perl6​: corrupted double-linked list​: 0x08702000 ***
======= Backtrace​: =========
/lib/tls/i686/cmov/libc.so.6[0xb77e268e]
/lib/tls/i686/cmov/libc.so.6(cfree+0x90)[0xb77e5e30]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2(mem_sys_free+0x23)[0xb7b9d343]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2[0xb7b9de3d]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2[0xb7bab23f]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2(Parrot_exit+0x70)[0xb7b933e0]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2[0xb7b92d46]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2(Parrot_ex_throw_from_c+0x61)[0xb7b92db1]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2[0xb7b92fb1]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2[0xb7cf3e26]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2(Parrot_default_increment+0x23)[0xb7cf4a23]
[0xb7653801]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2(Parrot_inc_p+0x4b)[0xb7b3081b]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2[0xb7bdb535]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2[0xb7badc09]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2[0xb7bae723]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2[0xb7bae95c]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2(Parrot_runops_fromc_args+0x43)[0xb7baf0b3]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2(Parrot_ex_throw_from_c+0x1cc)[0xb7b92f1c]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2[0xb7b92fb1]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2[0xb7bceb1a]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2[0xb7db0824]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2(Parrot_Class_init_pmc+0x21f)[0xb7db141f]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2(pmc_new_init+0x107)[0xb7bda1b7]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2(Parrot_newclass_p_p+0x58)[0xb7b4c7f8]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2[0xb7bdb535]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2[0xb7badc09]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2[0xb7bae723]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2[0xb7bae95c]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2(Parrot_runops_fromc_args+0x43)[0xb7baf0b3]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2(Parrot_ex_throw_from_c+0x1cc)[0xb7b92f1c]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2[0xb7b92fb1]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2[0xb7bceb1a]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2[0xb7db0824]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2(Parrot_Class_init_pmc+0x21f)[0xb7db141f]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2(pmc_new_init+0x107)[0xb7bda1b7]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2(Parrot_newclass_p_p+0x58)[0xb7b4c7f8]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2[0xb7bdb535]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2[0xb7badc09]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2[0xb7bae723]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2[0xb7bae95c]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2(Parrot_runops_fromc_args+0x43)[0xb7baf0b3]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2(Parrot_ex_throw_from_c+0x1cc)[0xb7b92f1c]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2[0xb7b92fb1]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2[0xb7bceb1a]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2[0xb7db0824]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2(Parrot_Class_init_pmc+0x21f)[0xb7db141f]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2(pmc_new_init+0x107)[0xb7bda1b7]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2(Parrot_newclass_p_p+0x58)[0xb7b4c7f8]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2[0xb7bdb535]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2[0xb7badc09]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2[0xb7bae723]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2[0xb7bae95c]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2(Parrot_runops_fromc_args+0x43)[0xb7baf0b3]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2(Parrot_ex_throw_from_c+0x1cc)[0xb7b92f1c]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2[0xb7b92fb1]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2[0xb7bceb1a]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2[0xb7db0824]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2(Parrot_Class_init_pmc+0x21f)[0xb7db141f]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2(pmc_new_init+0x107)[0xb7bda1b7]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2(Parrot_newclass_p_p+0x58)[0xb7b4c7f8]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2[0xb7bdb535]
/home/msl/parrot/blib/lib/libparrot.so.0.8.2[0xb7badc09]
======= Memory map​: ========
08048000-08263000 r-xp 00000000 08​:01 8586467 /home/msl/parrot/languages/perl6/perl6
08263000-08264000 rw-p 0021a000 08​:01 8586467 /home/msl/parrot/languages/perl6/perl6
08264000-0872c000 rw-p 08264000 00​:00 0 [heap]
b6511000-b6516000 r--s 00000000 08​:01 8539484 /home/msl/parrot/runtime/parrot/library/P6object.pbc
b6617000-b6644000 r--s 00000000 08​:01 8539304 /home/msl/parrot/runtime/parrot/library/PGE.pbc
b6644000-b6646000 r--s 00000000 08​:01 8539591 /home/msl/parrot/runtime/parrot/library/PCT/Grammar.pbc
b6646000-b6647000 r--s 00000000 08​:01 8539589 /home/msl/parrot/runtime/parrot/library/PCT.pbc
b7026000-b702b000 r--s 00000000 08​:01 8539478 /home/msl/parrot/runtime/parrot/library/Getopt/Obj.pbc
b702b000-b704e000 r--s 00000000 08​:01 8539590 /home/msl/parrot/runtime/parrot/library/PCT/PAST.pbc
b704e000-b7055000 r-xp 00000000 08​:01 8981757 /lib/tls/i686/cmov/librt-2.5.so
b7055000-b7057000 rw-p 00006000 08​:01 8981757 /lib/tls/i686/cmov/librt-2.5.so
b7600000-b7621000 rw-p b7600000 00​:00 0
b7621000-b7700000 ---p b7621000 00​:00 0
b7716000-b7721000 r-xp 00000000 08​:01 8978494 /lib/libgcc_s.so.1
b7721000-b7722000 rw-p 0000a000 08​:01 8978494 /lib/libgcc_s.so.1
b7736000-b7737000 rw-p b7736000 00​:00 0
b7737000-b7771000 r-xp 00000000 08​:01 8978504 /lib/libncurses.so.5.5
b7771000-b777a000 rw-p 00039000 08​:01 8978504 /lib/libncurses.so.5.5
b777a000-b777b000 rw-p b777a000 00​:00 0
b777b000-b78b6000 r-xp 00000000 08​:01 8981727 /lib/tls/i686/cmov/libc-2.5.so
b78b6000-b78b7000 r--p 0013b000 08​:01 8981727 /lib/tls/i686/cmov/libc-2.5.so
b78b7000-b78b9000 rw-p 0013c000 08​:01 8981727 /lib/tls/i686/cmov/libc-2.5.so
b78b9000-b78bc000 rw-p b78b9000 00​:00 0
b78bc000-b78e8000 r-xp 00000000 08​:01 8978542 /lib/libreadline.so.5.2
b78e8000-b78ec000 rw-p 0002c000 08​:01 8978542 /lib/libreadline.so.5.2
b78ec000-b78ed000 rw-p b78ec000 00​:00 0
b78ed000-b7931000 r-xp 00000000 08​:01 6883224 /usr/lib/libgmp.so.3.4.1
b7931000-b7932000 rw-p 00044000 08​:01 6883224 /usr/lib/libgmp.so.3.4.1
b7932000-b7937000 r-xp 00000000 08​:01 8981731 /lib/tls/i686/cmov/libcrypt-2.5.so
b7937000-b7939000 rw-p 00004000 08​:01 8981731 /lib/tls/i686/cmov/libcrypt-2.5.so
b7939000-b7960000 rw-p b7939000 00​:00 0
b7960000-b7973000 r-xp 00000000 08​:01 8981753 /lib/tls/i686/cmov/libpthread-2.5.so
b7973000-b7975000 rw-p 00013000 08​:01 8981753 /lib/tls/i686/cmov/libpthread-2.5.so
b7975000-b7977000 rw-p b7975000 00​:00 0
b7977000-b799c000 r-xp 00000000 08​:01 8981735 /lib/tls/i686/cmov/libm-2.5.so
b799c000-b799e000 rw-p 00024000 08​:01 8981735 /lib/tls/i686/cmov/libm-2.5.so
b799e000-b799f000 rw-p b799e000 00​:00 0
b799f000-b79a1000 r-xp 00000000 08​:01 8981733 /lib/tls/i686/cmov/libdl-2.5.so
b79a1000-b79a3000 rw-p 00001000 08​:01 8981733 /lib/tls/i686/cmov/libdl-2.5.so
b79a6000-b79a8000 r--s 00000000 08​:01 8539476 /home/msl/parrot/runtime/parrot/library/dumper.pbc
b79a8000-b79a9000 r--s 00000000 08​:01 8539488 /home/msl/parrot/runtime/parrot/library/Parrot/Exception.pbc
b79a9000-b79b1000 r--s 00000000 08​:01 8539592 /home/msl/parrot/runtime/parrot/library/PCT/HLLCompiler.pbc
b79b1000-b79b3000 r--s 00000000 08​:01 8539493 /home/msl/parrot/runtime/parrot/library/PGE/Util.pbc
b79b7000-b7f49000 r-xp 00000000 08​:01 8538694 /home/msl/parrot/blib/lib/libparrot.so.0.8.2
b7f49000-b7f93000 rw-p 00591000 08​:01 8538694 /home/msl/parrot/blib/lib/libparrot.so.0.8.2
b7f93000-b7f95000 rw-p b7f93000 00​:00 0
b7f95000-b7fae000 r-xp 00000000 08​:01 8978453 /lib/ld-2.5.so
b7fae000-b7fb0000 rw-p 00019000 08​:01 8978453 /lib/ld-2.5.so
bfeb4000-bfee5000 rw-p bfeb4000 00​:00 0 [stack]
ffffe000-fffff000 r-xp 00000000 00​:00 0 [vdso]
Aborted (core dumped)
msl@​edward​:~/perl/6$ uname -a
Linux edward 2.6.20-17-generic #​2 SMP Wed Aug 20 16​:47​:34 UTC 2008 i686 GNU/Linux
msl@​edward​:~/perl/6$ gcc --version
gcc (GCC) 4.1.2 (Ubuntu 4.1.2-0ubuntu4)
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

msl@​edward​:~/perl/6$

From mike@mikebaas.org

I just ran all three examples using Parrot 0.8.2
and did not experience this bug​:

my Any $x; ++$x; $x.say;
my $x = 0; ++$x; $x.say;
my $x; ++$x; $x.say;

Output​:
1
1
2

The RT System itself - Status changed from 'new' to 'open'

From markus@mnslaker.f9.co.uk

On Wed Jan 07 23​:25​:54 2009, initself wrote​:

I just ran all three examples using Parrot 0.8.2
and did not experience this bug​:

my Any $x; ++$x; $x.say;
my $x = 0; ++$x; $x.say;
my $x; ++$x; $x.say;

Output​:
1
1
2

Shouldn't that last command have printed 1, rather than 2?

In any case, with this morning's code, the problem seems to have been
solved​:

msl@​edward​:~/parrot/languages/perl6$ ~/bin/perl6 -v
This is Rakudo Perl 6, revision 35333 built on parrot 0.8.2-devel
for i486-linux-gnu-thread-multi.

Copyright 2006-2008, The Perl Foundation.

msl@​edward​:~/parrot/languages/perl6$ ~/bin/perl6 -e 'my $x; ++$x; $x.say'
1
msl@​edward​:~/parrot/languages/perl6$ ~/bin/perl6 -e 'my Int $x; ++$x;
$x.say'
1
msl@​edward​:~/parrot/languages/perl6$ ~/bin/perl6 -e 'my Any $x; ++$x;
$x.say'
1
msl@​edward​:~/parrot/languages/perl6$ ~/bin/perl6 -e 'my $x = 0; ++$x;
$x.say'
1
msl@​edward​:~/parrot/languages/perl6$

I think this bug is fixed. I'm not sure what the correct procedure is,
so I won't set the status to Resolved, but I'll be happy if someone else
does so.

From @pmichaud

Resolved.

Pm

@pmichaud - Status changed from 'open' to 'resolved'