Looks like DeleteDatabaseHelper is being collected in the wrong thread. https://tbpl.mozilla.org/php/getParsedLog.php?id=7283456&tree=Mozilla-Inbound TEST-UNEXPECTED-FAIL | /tests/dom/indexedDB/test/test_deleteDatabase_interactions.html | Exited with code -2147483645 during test run INFO | automation.py | Application ran for: 0:01:24.478000 INFO | automation.py | Reading PID log: c:\users\cltbld\appdata\local\temp\tmpqdzfpqpidlog PROCESS-CRASH | /tests/dom/indexedDB/test/test_deleteDatabase_interactions.html | application crashed (minidump found) Crash dump filename: c:\users\cltbld\appdata\local\temp\tmpmz3e6b\minidumps\9b2f2096-3917-4f92-aab8-97ddd4cc6bab.dmp Operating system: Windows NT 6.1.7600 CPU: x86 GenuineIntel family 6 model 23 stepping 10 2 CPUs Crash reason: EXCEPTION_BREAKPOINT Crash address: 0x732d111b Thread 34 (crashed) 0 mozalloc.dll!mozalloc_abort(char const * const) [mozalloc_abort.cpp:052bf8bd491e : 77 + 0x0] eip = 0x732d111b esp = 0x1215f708 ebp = 0x1215f7a8 ebx = 0x00000040 esi = 0x7332e457 edi = 0x7336a392 eax = 0x00000000 ecx = 0x7336a4c8 edx = 0x00000003 efl = 0x00000202 Found by: given as instruction pointer in context 1 xul.dll!NS_DebugBreak_P [nsDebugImpl.cpp:052bf8bd491e : 345 + 0x9] eip = 0x6cc9b5e1 esp = 0x1215f714 ebp = 0x1215f7a8 Found by: call frame info 2 xul.dll!AbortIfOffMainThreadIfCheckFast [nsCycleCollector.cpp:052bf8bd491e : 1278 + 0x17] eip = 0x6cc9de7a esp = 0x1215fb38 ebp = 0x1215fbcc ebx = 0x04731654 Found by: call frame info 3 xul.dll!nsCycleCollector::Suspect2(nsISupports *) [nsCycleCollector.cpp:052bf8bd491e : 2491 + 0x4] eip = 0x6cc9e660 esp = 0x1215fb50 ebp = 0x1215fbcc Found by: call frame info 4 xul.dll!NS_CycleCollectorSuspect2_P [nsCycleCollector.cpp:052bf8bd491e : 3420 + 0x8] eip = 0x6cc9e719 esp = 0x1215fb58 ebp = 0x1215fbcc Found by: call frame info 5 xul.dll!nsCycleCollectingAutoRefCnt::decr(nsISupports *) [nsISupportsImpl.h:052bf8bd491e : 211 + 0xa] eip = 0x6c596096 esp = 0x1215fb60 ebp = 0x1215fbcc Found by: call frame info 6 xul.dll!nsDOMEventTargetHelper::Release() [nsDOMEventTargetHelper.cpp:052bf8bd491e : 89 + 0x10] eip = 0x6c7929b6 esp = 0x1215fb74 ebp = 0x1215fbcc ebx = 0x00000000 Found by: call frame info 7 xul.dll!`anonymous namespace'::DeleteDatabaseHelper::~DeleteDatabaseHelper() + 0x1f eip = 0x6c89646d esp = 0x1215fb84 ebp = 0x1215fbcc Found by: call frame info

This should do it, I think. Rebuilding now.

Comment on attachment 572849 [details] [diff] [review] Patch r=me if you swap the order of mOpenHelper and mOpenRequest in the initializer list so that they match the order in which they're declared.

Comment on attachment 572849 [details] [diff] [review] Patch We're going to need this on Aurora.

Marking qa- as I don't think this is something QA needs to verify. Please set to qa+ if that is not the case.