[Bug 1107732] New: Perl core-dumps if a hash is tied to DB_File before spawning a thread

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1107732

            Bug ID: 1107732
           Summary: Perl core-dumps if a hash is tied to DB_File before
                    spawning a thread
           Product: Fedora
           Version: 19
         Component: perl-DB_File
          Severity: medium
          Assignee: ppisar at redhat.com
          Reporter: ppisar at redhat.com
        QA Contact: extras-qa at fedoraproject.org
                CC: perl-devel at lists.fedoraproject.org, ppisar at redhat.com,
                    psabata at redhat.com
   External Bug ID: CPAN 96357



+++ This bug was initially created as a clone of Bug #1107728 +++

+++ This bug was initially created as a clone of Bug #1107542 +++

+++ This bug was initially created as a clone of Bug #1104827 +++

Description of problem:

Perl script using SDBM_File module is core dumping. Seems to match this
upstream bug:  https://rt.perl.org/Public/Bug/Display.html?id=61912#txn-515026

[...]

Steps to Reproduce:

Create reproducer test script sdbm_test.pl containing the following lines, as
described in the upstream bug report:

    #!/usr/bin/perl

    use strict;
    use Fcntl;
    use SDBM_File;
    use threads;
    use threads::shared;

    my %dbtest;
    tie(%dbtest, 'SDBM_File', "test.db", O_RDWR|O_CREAT, 0666);

    for (1 .. 2)
    {
            my $thr = threads->new(\&testThread, $_);
            $thr->detach();
    }
    sleep 4;

    sub testThread
    {
            my $n = shift;
            print "thread #" . $n . " started\n";
    }

Make script executable and run which produces the following output:

    [root at util6vm ~]# chmod u+x sdbm_test.pl 
    [root at util6vm ~]# ./sdbm_test.pl 

Expected results:

No errors.

Actual results:

    thread #1 started
    thread #2 started
    *** glibc detected *** /usr/bin/perl: double free or corruption (out):
0x0000000000e2c2c0 ***
    ======= Backtrace: =========
    /lib64/libc.so.6[0x3d2ca76166]
    /lib64/libc.so.6[0x3d2ca78c93]
   
/usr/lib64/perl5/auto/SDBM_File/SDBM_File.so(XS_SDBM_File_DESTROY+0xc0)[0x7f9d58fb06f0]

[...]

----

DB_File (BerkeleyDB binding) in Fedora 20 and newer is affected too.

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