Yeah ..... bummer !!
I'm building against a pre-compiled GD library I got from somewhere. It's recent, but I don't know what version it is and couldn't find a quick way of determining the version. GD-2.30 builds cleanly against it for me (using MinGW compiler) and the tests run fine - except for one warning:

"t/Polyline....Subroutine scale redefined at D:\comp58_M\GD-2.30\blib\lib/GD/Polyline.pm line 52."

The error in your test script arises when 'my $raw = $gd->gd;' is called. That calls the XS function gdgd(), which can produce the "Free to wrong pool..." error on subsequent iterations.
At first I thought it might be the gdFree() that gdgd() calls, but the fault occurs after that - ie, I guess, when gdgd() exits/returns. There's not a lot of code in gdgd() so I fiddled about with it for quite some time but couldn't get anywhere .... which means I'm about stumped. I did get some mileage from allocating with New() ... but success seemed to depend upon the strategic placement of debug printf() statements ... which is not a good sign :-)

Cheers,
Rob

In reply to Re^7: Segfault on second (identical) call to a sub by syphilis
in thread Segfault on second (identical) call to a sub by BrowserUk

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