https://crash-stats.mozilla.com/report/list?signature=mozilla%3A%3Agfx%3A%3AGetRetainedImageFromSourceSurface&product=Firefox&query_type=contains&range_unit=weeks&process_type=any&hang_type=any&date=2014-02-19+22%3A00%3A00&range_value=4#tab-reports These are currently the #8 Mac topcrasher on the 30 branch (the trunk). The earliest build for which I can find one of these crashes is firefox-2014-02-09-03-02-03-mozilla-central: bp-fb1d293c-e1a7-4a3b-9fcb-edf8b2140210 But they start in quantity with the firefox-2014-02-13-03-02-01-mozilla-central build: bp-d096bb55-8c5e-4bd2-949e-b73352140214 bp-b7d05068-503d-4fed-8b64-0388a2140214 bp-4f938453-8a1a-485f-b772-369ee2140214 bp-21191371-cd9c-41e2-9602-c7bc62140214 bp-b743216f-5505-4ca8-8ab3-c5cef2140214 bp-6303bc85-3ca5-4e3a-a335-718d82140213 bp-6407d1e6-c086-4ee2-9167-38a482140213 These are the result of a deliberate crash, here: https://hg.mozilla.org/mozilla-central/annotate/660b62608951/gfx/2d/DrawTargetCG.cpp#l231 This code was added by the following patch, a long time ago: https://hg.mozilla.org/mozilla-central/rev/2bbcf26785fe Bug 930956 - Make DrawTargetCG::DrawSurface support painting a DataSourceSurface that is not a DataSourceSurfaceCG. r=jrmuizel, r=Bas author Markus Stange <mstange@themasta.com> Wed Nov 27 12:21:43 2013 +0100 (at Wed Nov 27 12:21:43 2013 +0100) So it's presumably not *this* patch that's the trigger here (since these crashes started very recently). But Markus, I'm going to CC you anyway, for whatever insights you may have on this bug.

This is probably a duplicate of bug 972758 with fixes in bug 973892.

So it is. Thanks for the info.