Bug#504648: libdbd-mysql-perl: DBD::mysql segfaults on mysql_ping and auto_reconnect in mod_perl environments
phil at reflected.net
Wed Nov 5 21:39:44 UTC 2008
After migrating one of our production systems from Etch to Lenny, one of our mod_perl applications started intermittently segfaulting on some page loads. After much troubleshooting, this was narrowed down to the mysql_ping function in DBD::mysql combined with auto reconnects when an open database connection had "went away" due to a timeout or other problem.
After further research, it does appear this bug has been reported upstream: http://rt.cpan.org/Public/Bug/Display.html?id=37027
Since test code has been supplied via the upstream bug reporting system, I will not attach unless requested. A patch may or may not be available, but it has not been integrated into the upstream released package yet.
We have tested this bug on 4.007 and 4.008 and reproduced it reliably with both. A downgrade to 4.005 seems to alleviate this problem.
Since this is a servere regression for us (we cannot use Lenny on our production web cluster as-is), I also presume it is for others - as DBD::mysql is a rather common package in use by those w/ Perl installs. This does not require mod_perl to surface, however given most common use cases it is likely to pose a more widespread problem than standalone Perl programs and CGI scripts.
-- System Information:
Debian Release: lenny/sid
APT prefers testing
APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Kernel: Linux 220.127.116.11 (SMP w/8 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Versions of packages libdbd-mysql-perl depends on:
ii libc6 2.7-15 GNU C Library: Shared libraries
ii libdbi-perl 1.607-1 Perl5 database interface by Tim Bu
ii libmysqlclient15off 5.0.51a-15 MySQL database client library
ii perl 5.10.0-16 Larry Wall's Practical Extraction
ii perl-base [perlapi-5.10.0] 5.10.0-16 minimal Perl system
libdbd-mysql-perl recommends no packages.
libdbd-mysql-perl suggests no packages.
-- no debconf information
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