perl-Gtk2: GdkWindow.t fails with libgtk2 2.24.28 and libgdk-pixbuf2.0 2.31.4-2

[intrigeri+debian boum org]

Hi,

two months ago, perl-Gtk2's test suite passed just fine on Debian
testing/sid. Full log at:
https://buildd.debian.org/status/fetch.php?pkg=libgtk2-perl&arch=amd64&ver=2:1.2495-1&stamp=1430048177

But it now fails:

  $ prove -l t/GdkWindow.t
  t/GdkWindow.t .. 1/58 *** Error in `/usr/bin/perl': free(): invalid size: 0x00000000015ac210 ***
  t/GdkWindow.t .. Failed 36/58 subtests 

Some relevant dependency upgrades that happened in the meantime:

 * libgtk2.0-0 amd64 2.24.25-3 -> 2.24.28-1
 * libgdk-pixbuf2.0-common all 2.31.1-2 -> 2.31.4-2

This was reported to Debian as:

 https://bugs.debian.org/790532

Do you need other information to help debug this problem?

Cheers,
-- 
intrigeri