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I'm seeing the following error on ASan builds locally and the fuzzing build server: > In file included from objdir/dom/base/Unified_cpp_dom_base1.cpp:101: > dom/base/Element.cpp:183:1: error: static_assert failed "DOM size changed" > ASSERT_ELEMENT_SIZE(Element, 120); > ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > dom/base/Element.cpp:178:3: note: expanded from macro 'ASSERT_ELEMENT_SIZE' > static_assert(sizeof(void*) != 8 || a == b, "DOM size changed"); \ > ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > dom/base/Element.cpp:183:1: note: in instantiation of template > class 'CheckElementSize<120, 128>' requested here After investigating this with Bobby, we found that the check to decide about EXTRA_DOM_ELEMENT_BYTES in dom/base/Element.cpp isn't correct: http://searchfox.org/mozilla-central/rev/f55349994fdac101d121b11dac769f3f17fbec4b/dom/base/Element.cpp#169 The correct check is MOZ_THREAD_SAFETY_OWNERSHIP_CHECKS_SUPPORTED and that is influenced also by a combination of disabled profiling and nightly builds in such a way that only the ASan builds we have on TC seem to fulfill this. So this bug isn't related to ASan itself. Patch coming after try runs.
Comment on attachment 8869111 [details] Bug 1365954 - Fix check for EXTRA_DOM_ELEMENT_BYTES. https://reviewboard.mozilla.org/r/140740/#review144608 r=me with that fixed. ::: dom/base/Element.cpp:167 (Diff revision 1) > // We need different numbers on debug and opt to deal with the owning thread > // pointer that comes with the non-threadsafe refcount on FragmentOrElement. This comment is out of date, please update it.
Comment on attachment 8869111 [details] Bug 1365954 - Fix check for EXTRA_DOM_ELEMENT_BYTES. https://reviewboard.mozilla.org/r/140740/#review144610 Keeping r+ by last comment
Pushed by firstname.lastname@example.org: https://hg.mozilla.org/integration/autoland/rev/33ef54dce8af Fix check for EXTRA_DOM_ELEMENT_BYTES. r=bholley