https://treeherder.mozilla.org/logviewer.html#?job_id=5543182&repo=fx-team Assertion failure: aCount == 0 || aStart < Length() (Invalid aStart index), at ../../dist/include/nsTArray.h:1648 TEST-UNEXPECTED-FAIL | dom/canvas/test/test_offscreencanvas_many.html | application terminated with exit code 1 PROCESS-CRASH | dom/canvas/test/test_offscreencanvas_many.html | application crashed [@ nsTArray_Impl<mozilla::gl::GLContext::NamedResource, nsTArrayInfallibleAllocator>::RemoveElementsAt(unsigned long, unsigned long)]

From a look at the crashing code, the most likely way this could happen seems to be that the GLContext is accessed from several thread, and the code that tracks textures is called concurrently. Jeff, does sound possible ? how is the offscreen canvas's GLContext used with respect to the different threads at play, is the main thread touching the GLConext as well?

This test still appears to have a lot of issues on OSX. Any chance we can up the priority here a bit?

Vincent, any idea what could be going on here?

A better summary of the current state of the test_offscreencanvas tests: https://bugzilla.mozilla.org/buglist.cgi?keywords=intermittent-failure%2C%20&keywords_type=allwords&list_id=13051151&short_desc=test_offscreencanvas&resolution=---&query_format=advanced&short_desc_type=allwordssubstr

Morris, please help to look at it.

(In reply to Ryan VanderMeulen [:RyanVM] from comment #5) > A better summary of the current state of the test_offscreencanvas tests: > https://bugzilla.mozilla.org/buglist.cgi?keywords=intermittent- > failure%2C%20&keywords_type=allwords&list_id=13051151&short_desc=test_offscre > encanvas&resolution=---&query_format=advanced&short_desc_type=allwordssubstr I'd tried to run the following command on both MAC and Ubuntu many times, but I still can not reproduce any issues about offscreencanvas. :( ./mach mochitest --repeat 20 --tag offscreencanvas

Bulk assigning P3 to all open intermittent bugs without a priority set in Firefox components per bug 1298978.