Bug#584428: libdbd-mysql-perl: Placeholder and comments causes a hang and high cpu usage.

Dean Hamstead dean at fragfest.com.au
Thu Jun 3 14:07:42 UTC 2010

Package: libdbd-mysql-perl
Version: 4.014-1
Severity: important


i have found that the following will cause a script to hang and take 100% cpu usage...


use strict;
use warnings;

use DBI;

  my $dbh = DBI->connect('DBI:mysql:xxx:localhost','xxx','xxx') or die "cant connect to database: $DBI::errstr";

## this works
   my $sth = $dbh->prepare('select * from col --') or die "Couldn't prepare statement: " . $dbh->errstr;

#   etc...

## this works
   $sth = $dbh->prepare('select * from coly where some_key = ? ') or die "Couldn't prepare statement: " . $dbh->errstr;

## this hangs and goes to 100% cpu usage, strace shows nothing of value
   $sth = $dbh->prepare('select * from coly where some_key = ? ---') or die "Couldn't prepare statement: " . $dbh->errstr;


I dont have another database to try this on, but there is already a bug like this

-- System Information:
Debian Release: squeeze/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.32-3-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages libdbd-mysql-perl depends on:
ii  libc6                2.10.2-9            Embedded GNU C Library: Shared lib
ii  libdbi-perl [perl-db 1.610.90+is+1.609-1 Perl Database Interface (DBI)
ii  libmysqlclient16     5.1.46-1            MySQL database client library
ii  perl                 5.10.1-12           Larry Wall's Practical Extraction 
ii  perl-base [perlapi-5 5.10.1-12           minimal Perl system

libdbd-mysql-perl recommends no packages.

libdbd-mysql-perl suggests no packages.

-- no debconf information

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