This bug was filed from the Socorro interface and is report bp-810d1dc2-96f0-4adc-822b-9cf192120809 . ============================================================= STR: 1. Run "cross_fuzz" browser stress test: http://lcamtuf.coredump.cx/cross_fuzz/cross_fuzz_msie_randomized_seed.html 2. Wait for a few minutes AR: Crash! I believe this is a recent regression. I have reproduced this crash on Nightly 8-08 and 8-09 on OS X 10.7.4 (Lion) and Nightly 8-09 on OS X 10.8.0 (ML). On OS X 10.7, the browser crashed after about 1-10 minutes. On OS X 10.8, the browser crashed in 0-4 minutes, but usually in less than 1 minute.
I also reproduced with Nightly 8-07 on OS X 10.8. I tested earlier builds on OS X 10.7, but I could not repro the crash (but maybe I didn't wait long enough). Assuming Nightly 8-07 was the regression point, here is the pushlog from 8-06 to 8-07: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=c8d94fe7506a&tochange=1bbc0b65dffb
Do you have a crash stack?
The stack trace from the linked crash reports is: Frame Module Signature Source 0 XUL XPCWrappedNative::FindTearOff xpcprivate.h:2631 1 XUL XPCNativeInterface::GetNewOrUsed ReentrantMonitor.h:80 2 XUL nsThreadManager::GetIsMainThread nsThreadManager.cpp:272 3 XUL XPCConvert::NativeInterface2JSObject XPCConvert.cpp:940 4 XUL js::AutoCompartment::enter jswrapper.cpp:445 5 XUL NativeInterface2JSObject nsXPConnect.cpp:1237 6 XUL XUL@0x9dc31f 7 XUL nsXPConnect::WrapNativeToJSVal nsXPConnect.cpp:1293 8 XUL nsCSSStyleDeclSH::PreCreate 9 XUL XPCCallContext::XPCCallContext XPCCallContext.cpp:31 10 XUL xpc::WrapperFactory::PrepareForWrapping WrapperFactory.cpp:245 bp-810d1dc2-96f0-4adc-822b-9cf192120809 bp-20e7626a-f7bf-4008-968c-cc5972120809 bp-ef5d2451-2be1-4570-bc59-0faa42120809 bp-e9767b09-9362-4016-a631-6eec82120809 bp-646cd035-17ac-4277-8154-ad1172120809 bp-f54ec5f5-bf76-45f3-9337-0d6922120809 bp-148b49b0-c76d-4297-9e80-38e222120809 bp-e54fa972-c167-4e4a-81a2-9e84f2120809 bp-97237563-1a28-4975-ae20-9345a2120809 bp-32b254aa-2aed-4880-b40f-a82532120809
Created attachment 650709 [details] more complete stack from GDB I was able to reproduce this fairly quickly on OSX 10.6, in GDB. The stack trace looks slightly different for me. It looks like we're calling XPCWrappedNative::FindTearOff where |this| is NULL. #0 XPCWrappedNative::FindTearOff js/xpconnect/src/XPCWrappedNative.cpp:1956 #1 XPCConvert::NativeInterface2JSObject js/xpconnect/src/XPCConvert.cpp:940 #2 NativeInterface2JSObject js/xpconnect/src/nsXPConnect.cpp:1237 #3 nsXPConnect::WrapNativeToJSVal js/xpconnect/src/nsXPConnect.cpp:1294 #4 xpc::WrapperFactory::PrepareForWrapping js/xpconnect/wrappers/WrapperFactory.cpp:245 #5 JSCompartment::wrap js/src/jscompartment.cpp:215 #6 JSCompartment::wrap js/src/jscompartment.cpp:327 #7 js::RemapWrapper (cx=0x12167db20, wobj=0x12ff96e00, newTarget=0x14b68c490) at /Users/amccreight/mz/cent2/js/src/jswrapper.cpp:1147 #8 js::RemapAllWrappersForObject js/src/jswrapper.cpp:1189 #9 JS_TransplantObject js/src/jsapi.cpp:1658 #10 xpc::TransplantObject js/xpconnect/wrappers/WrapperFactory.cpp:663 #11 XPCWrappedNative::ReparentWrapperIfFound js/xpconnect/src/XPCWrappedNative.cpp:1682 #12 XPCWrappedNative::RescueOrphans js/xpconnect/src/XPCWrappedNative.cpp:1795 #13 MoveWrapper js/xpconnect/src/nsXPConnect.cpp:1569 #14 nsXPConnect::MoveWrappers js/xpconnect/src/nsXPConnect.cpp:1693 #15 nsHTMLDocument::Open content/html/document/src/nsHTMLDocument.cpp:1503 #16 nsHTMLDocument::WriteCommon content/html/document/src/nsHTMLDocument.cpp:1687 #17 nsIDOMHTMLDocument_Write js/xpconnect/src/dom_quickstubs.cpp:13714
Bobby, this looks like your sort of thing.
(In reply to Andrew McCreight [:mccr8] from comment #4) > Created attachment 650709 [details] > more complete stack from GDB > > I was able to reproduce this fairly quickly on OSX 10.6, in GDB. The stack > trace looks slightly different for me. > > It looks like we're calling XPCWrappedNative::FindTearOff where |this| is > NULL. Indeed. From the previous stack frame, this means that we're pulling the private off an XPCWN reflector when the private is null. Andrew and I have been running into a couple of such cases lately. So anyway. |flat| (the reflector) appears to have been pulled off the wrapper cache of the underlying XPCOM object. This makes sense, because it looks like we don't update the wrapper cache until after the call to JS_TransplantObject. You'd think that we'd hit this problem all over the place, because we call JS_WrapObject() in the target object all over the place during transplant. The reason we don't is that normally an object with a wrapper cache also implements PreCreate and requests one reflector per native (rather than one reflector per scope). And the call to WrapNativeToJSVal only happens if we go with one reflector per scope. It's possible we're getting caught in all that funny business with PreCreate I had to add in PrepareForWrapping (see the mega comment). Either way, the next step is to figure out what kind of object we're wrapping here, and why it's being so funny about PreCreate. Andrew, do you want to investigate that? If you prefer, I can take this over solo, but co-op is always more fun. :-)
I'll try poking at this.
Well, it looks like the native involved is a DOMCSSDeclarationImpl. I haven't figured out anything else yet.
I tried this again, and I just end up with various hangs in the JS engine. One in the GC, some inside the method JIT. The hangs were slightly odd in that the browser was definitely doing something (breaking again later would end up with a different stack), but I'm not sure what. Anyways, the original XPConnect problem seems to be gone, so I'm going to unassign myself here.
I attempted to replicate a JS hang with Nightly 2012-12-02 on OSX ML by going to that URL. I got occasional "Install Error" "This search engine isn't supported by Nightly and can't be installed" but no hang in the browser. Is anyone able to replicate the JS in Comment 9?
Naveed, I have not been able to reproduce this bug for a few weeks.
Crash volume for signature 'XPCWrappedNative::FindTearOff': - nightly(version 50):0 crashes from 2016-06-06. - aurora (version 49):2 crashes from 2016-06-07. - beta (version 48):26 crashes from 2016-06-06. - release(version 47):70 crashes from 2016-05-31. - esr (version 45):4 crashes from 2016-04-07. Crash volume on the last weeks: W. N-1 W. N-2 W. N-3 W. N-4 W. N-5 W. N-6 W. N-7 - nightly 0 0 0 0 0 0 0 - aurora 0 0 0 0 1 1 0 - beta 3 2 5 3 4 8 1 - release 12 7 13 10 8 8 7 - esr 1 1 0 0 0 0 0 Affected platforms: Windows, Mac OS X, Linux