Re: [rt.cpan.org #77137] DBI 1.620 causes segfault in Perl when used with module Thread::Pool::Simple.

Dave, I'd be grateful if you could take a look at this since it
seems to involve our recent changes and standard perl modules.

Tim.

On Fri, May 11, 2012 at 10:41:11AM -0400, Rowan Klöti via RT wrote:
> Fri May 11 10:41:10 2012: Request 77137 was acted upon.
> Transaction: Ticket created by rok
>        Queue: DBI
>      Subject: DBI 1.620 causes segfault in Perl when used with module
>  Thread::Pool::Simple.
>    Broken in: 1.620
>     Severity: Important
>        Owner: Nobody
>   Requestors: [email protected]
>       Status: new
>  Ticket <URL: https://rt.cpan.org/Ticket/Display.html?id=77137 >
> 
> 
> I am using Perl version 5.14 on Linux 2.6.32.52_1-osix-3466 (custom
> Linux distribution from LFS) with DBI version 1.620 as well as version
> 0.25 of the module Thread::Pool::Simple (from CPAN).
> 
> The module Thread::Pool::Simple does not include any XS code, and itself
> uses only the modules Carp, Storable, Thread::Queue and
> Thread::Semaphore. These are all included in the Perl distribution as of
> Perl 5.14 and possibly also earlier versions.
> 
> The attached script causes a segmentation fault in Perl without any
> Perl-specific error messages being generated.
> 
> It is only necessary to include the DBI module with a use statement in
> order to trigger the segfault, creating a database handle is not
> necessary. Conversely, removing the use statement causes the script to
> work as expected.
> 
> Version 1.620 of DBI causes this issue, while 1.616 does not. Based on
> the changes document on the DBI CPAN page, the following changes appear
> to be potential candidates for the introduction of this problem:
> 
> In 1.617:
> Enhanced performance for threaded perls (Dave Mitchell, Tim Bunce)
> 
> In 1.618:
> Significantly optimized DBI internals for threads (Dave Mitchell)
> Xsub to xsub calling optimization now enabled for threaded perls.
> 
> If it is necessary to contact me, please Cc the email to the following
> addresses:
> [email protected]
> [email protected]
> [email protected]
> As I will not be available until next Friday.
> 
> Thanks for your attention,
> Rowan Klöti
> Open Systems AG