Currently ranked #12 in 3.1 beta2 reports stack looks like: 0 js3250.dll JS_GetMethodById js/src/jsapi.cpp:3641 1 js3250.dll js_CallIteratorNext js/src/jsiter.cpp:611 2 js3250.dll js_Interpret js/src/jsinterp.cpp:3241 3 js3250.dll js_Execute js/src/jsinterp.cpp:1559 4 js3250.dll obj_eval js/src/jsobj.cpp:1345 5 js3250.dll js_Invoke js/src/jsinterp.cpp:1313 6 js3250.dll js_Interpret js/src/jsinterp.cpp:5135 7 js3250.dll js_Execute js/src/jsinterp.cpp:1559 8 js3250.dll obj_eval js/src/jsobj.cpp:1345 9 js3250.dll js_Invoke js/src/jsinterp.cpp:1313 10 js3250.dll js_Interpret js/src/jsinterp.cpp:5135 11 js3250.dll js_Execute js/src/jsinterp.cpp:1559 12 js3250.dll obj_eval js/src/jsobj.cpp:1345 13 js3250.dll js_Invoke js/src/jsinterp.cpp:1313 14 js3250.dll js_Interpret js/src/jsinterp.cpp:5135 15 js3250.dll js_Invoke js/src/jsinterp.cpp:1331 16 xul.dll nsXPCWrappedJSClass::CallMethod js/src/xpconnect/src/xpcwrappedjsclass.cpp:1592 17 xul.dll nsXPCWrappedJS::CallMethod js/src/xpconnect/src/xpcwrappedjs.cpp:563 18 xul.dll PrepareAndDispatch xpcom/reflect/xptcall/src/md/win32/xptcstubs.cpp:114 19 xul.dll SharedStub xpcom/reflect/xptcall/src/md/win32/xptcstubs.cpp:141 20 xul.dll nsDOMEventListenerWrapper::HandleEvent content/base/src/nsXMLHttpRequest.cpp:168 21 xul.dll nsEventListenerManager::HandleEventSubType content/events/src/nsEventListenerManager.cpp:1091 Looks like one person in particular might have hit this repeatedly so maybe there is a reproducable test case buried in the socorro database. http://crash-stats.mozilla.com/report/index/da89300b-ad6f-467d-887d-6aa042081218 http://crash-stats.mozilla.com/report/index/de1edc57-8796-4a13-88ff-12f332081218 http://crash-stats.mozilla.com/report/index/de6a787e-1d16-4c28-a350-177d92081221 http://crash-stats.mozilla.com/report/index/5b9dfc4f-e934-47fb-88fa-35df52081221

Related to Bug 470758 ?