From perl@profvince.com

Created by perl@profvince.com

The following code, which is a reduced testcase for the op/threads.t failure, segfaults for a perl built with threads and mymalloc enabled :

#!perl

# Requires threads and mymalloc

use strict;
use warnings;
use threads;

my @t;
push @t, threads->create( sub { require IO }) for 1 .. 1000;
$_->join for grep defined, @t;

It also sometimes aborts with this assertion failure :

assertion botched (free()ed/realloc()ed-away memory was overwritten?): !(MallocCfg[MallocCfg_filldead] && MallocCfg[MallocCfg_fillcheck]) || !cmp_pat_4bytes((unsigned char*)(p + 1), (((1 << ((bucket) >> 0)) + ((bucket >= 15 * 1) ? 4096 : 0)) - (sizeof(union overhead) + sizeof (unsigned int))) + sizeof (unsigned int), fill_deadbeef) (malloc.c:1546)

Valgrind says :

...
==22779== Invalid read of size 4
==22779== at 0x5533F8: Perl_hv_common (hv.c:361)
==22779== by 0x464F55: perl_get_emergency_buffer (malloc.c:1160)
==22779== by 0x4656B9: emergency_sbrk (malloc.c:1256)
==22779== by 0x46688B: getpages (malloc.c:1717)
==22779== by 0x46747F: morecore (malloc.c:1965)
==22779== by 0x465C60: Perl_malloc (malloc.c:1477)
==22779== by 0x5D6008: Perl_ptr_table_store (sv.c:10840)
==22779== by 0x55300D: Perl_he_dup (hv.c:175)
==22779== by 0x5D92D6: S_sv_dup_common (sv.c:11273)
==22779== by 0x5D9A7C: Perl_sv_dup_inc (sv.c:11351)
==22779== by 0x5D59D2: Perl_gp_dup (sv.c:10694)
==22779== by 0x5D8969: S_sv_dup_common (sv.c:11194)
==22779== Address 0xabababababababb7 is not stack'd, malloc'd or (recently) free'd
==22779==
==22779==
==22779== Process terminating with default action of signal 11 (SIGSEGV)
==22779== General Protection Fault
==22779== at 0x5533F8: Perl_hv_common (hv.c:361)
==22779== by 0x464F55: perl_get_emergency_buffer (malloc.c:1160)
==22779== by 0x4656B9: emergency_sbrk (malloc.c:1256)
==22779== by 0x46688B: getpages (malloc.c:1717)
==22779== by 0x46747F: morecore (malloc.c:1965)
==22779== by 0x465C60: Perl_malloc (malloc.c:1477)
==22779== by 0x5D6008: Perl_ptr_table_store (sv.c:10840)
==22779== by 0x55300D: Perl_he_dup (hv.c:175)
==22779== by 0x5D92D6: S_sv_dup_common (sv.c:11273)
==22779== by 0x5D9A7C: Perl_sv_dup_inc (sv.c:11351)
==22779== by 0x5D59D2: Perl_gp_dup (sv.c:10694)
==22779== by 0x5D8969: S_sv_dup_common (sv.c:11194)
==22779==
==22779== HEAP SUMMARY:
...

Perl Info


Flags:
    category=core
    severity=low

Site configuration information for perl 5.13.2:

Configured by vince at Tue Jun 22 23:29:08 CEST 2010.

Summary of my perl5 (revision 5 version 13 subversion 2) configuration:
  Commit id: e4b5ce810b542fc115cb7db392c771730fc4f98e
  Platform:
    osname=linux, osvers=2.6.34-fuuka.profvince.com, archname=x86_64-linux-thread-multi
    uname='linux fuuka 2.6.34-fuuka.profvince.com #1 smp wed jun 16 22:13:24 cest 2010 x86_64 intel(r) core(tm)2 duo cpu e6750 @ 2.66ghz genuineintel gnulinux '
    config_args='-Doptimize= -g3 -des -Dusedevel -Dman1dir=none -Dman3dir=none -Dcf_email=vpit@cpan.org -Dmydomain=fuuka.profvince.com -Dusedevel -DDEBUGGING -Dusethreads -Dusemmorebits -Dusemymalloc -Dprefix=/home/vince/perl/builds/dbg/thr/64/mm/5.13.1-223-ge4b5ce8'
    hint=recommended, useposix=true, d_sigaction=define
    useithreads=define, usemultiplicity=define
    useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
    use64bitint=define, use64bitall=define, uselongdouble=undef
    usemymalloc=y, bincompat5005=undef
  Compiler:
    cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize=' -g3',
    cppflags='-D_REENTRANT -D_GNU_SOURCE -DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector'
    ccversion='', gccversion='4.4.4', gccosandvers=''
    intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
    ivtype='long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
    alignbytes=8, prototype=define
  Linker and Libraries:
    ld='cc', ldflags =' -fstack-protector -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib /lib64 /usr/lib64 /usr/local/lib64
    libs=-lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lpthread -lc -lgdbm_compat
    perllibs=-lnsl -ldl -lm -lcrypt -lutil -lpthread -lc
    libc=/lib/libc-2.11.2.so, so=so, useshrplib=false, libperl=libperl.a
    gnulibc_version='2.11.2'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
    cccdlflags='-fPIC', lddlflags='-shared  -g3 -L/usr/local/lib -fstack-protector'

Locally applied patches:
    


@INC for perl 5.13.2:
    lib
    /home/vince/perl/builds/dbg/thr/64/mm/5.13.1-223-ge4b5ce8/lib/site_perl/5.13.2/x86_64-linux-thread-multi
    /home/vince/perl/builds/dbg/thr/64/mm/5.13.1-223-ge4b5ce8/lib/site_perl/5.13.2
    /home/vince/perl/builds/dbg/thr/64/mm/5.13.1-223-ge4b5ce8/lib/5.13.2/x86_64-linux-thread-multi
    /home/vince/perl/builds/dbg/thr/64/mm/5.13.1-223-ge4b5ce8/lib/5.13.2
    .


Environment for perl 5.13.2:
    HOME=/home/vince
    LANG=fr_FR.UTF-8
    LANGUAGE (unset)
    LC_ALL=fr_FR.UTF-8
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/home/vince/bin:/home/vince/perl/builds/bin:/usr/local/bin:/usr/bin:/bin:/opt/bin:/usr/x86_64-pc-linux-gnu/gcc-bin/4.4.4:/opt/intel/cce/10.1.018/bin:/usr/games/bin
    PERL_BADLANG (unset)
    SHELL=/bin/bash

op/threads.t segfaults with threads and mymalloc #10459

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