This bug was filed from the Socorro interface and is report bp-6d09208c-db83-4dc6-aae7-b1ed72151115. ============================================================= Top crash #27 on Firefox 42 in the past week with 2756 crashes (447 of them are startup), see https://crash-stats.mozilla.com/report/list?product=Firefox&range_value=7&range_unit=days&date=2015-11-16&signature=RtlLeaveCriticalSection+%7C+je_calloc+%7C+create_bits&version=Firefox%3A42.0 Crashing Thread Frame Module Signature Source 0 ntdll.dll RtlLeaveCriticalSection 1 mozglue.dll je_calloc memory/mozjemalloc/jemalloc.c 2 xul.dll create_bits gfx/cairo/libpixman/src/pixman-bits-image.c 3 xul.dll create_bits_image_internal gfx/cairo/libpixman/src/pixman-bits-image.c 4 xul.dll _composite_glyphs_via_mask gfx/cairo/cairo/src/cairo-image-surface.c 5 xul.dll _clip_and_composite gfx/cairo/cairo/src/cairo-image-surface.c 6 xul.dll _cairo_image_surface_glyphs gfx/cairo/cairo/src/cairo-image-surface.c 7 xul.dll _cairo_surface_show_text_glyphs gfx/cairo/cairo/src/cairo-surface.c

Lots of comments in the crash report say it's from watching a youtube video. Interesting that this is cairo. @Anthony, Can you try to reproduce this on any of the machines in Toronto? They all look like Windows 7 machines and on a discrete GPU. I don't see any results for Intel devices.

Might be the same cause as bug 1218118. See https://bugzilla.mozilla.org/show_bug.cgi?id=1225270#c3

[Tracking Requested - why for this release]: Interesting that these show up 100% with Firefox 42.0 or 42.0b99 and no other Firefox version. https://crash-stats.mozilla.com/search/?product=Firefox&signature=%3DRtlLeaveCriticalSection+|+je_calloc+|+create_bits&_facets=signature&_facets=adapter_vendor_id&_facets=adapter_device_id&_facets=adapter_driver_version&_columns=date&_columns=signature&_columns=product&_columns=version&_columns=build_id&_columns=platform#facet-adapter_vendor_id Vendor Correlations: 67% AMD vs 33% NVIDIA vs 0% Intel Top AMD cards are in the EVERGREEN SUMO family: * 0x9647: 29.01% * 0x964a: 18.24% * 0x9648: 15.12% * 0x9640: 10.02% * 0x9641: 6.49% Top NVIDIA cards are all in the Fermi family: * Fermi GF108: 24.20% * Fermi GF116: 18.15% * Fermi GF119: 8.07% Unfortunately I am not in Toronto and don't have access to the lab but according to the wiki we don't have hardware for the more highly correlated devices. It's still strange for me that this *only* shows up on Windows 7 and only on Firefox 42.0. Did Microsoft push an update recently that may have triggered this?

[Tracking Requested - why for this release]: nominating to track based on comment 3.

FWIW, http://ok.ru/ is the top domain reported, excluding about: pages: > 121 - about: pages > 111 - ok.ru > 38 - youtube.com > 30 - facebook.com > 11 - vk.com

Just 5 crashes in the past week at https://crash-stats.mozilla.com/signature/?signature=RtlLeaveCriticalSection%20%7C%20je_calloc%20%7C%20create_bits all from Firefox 42.0, resolving.