132174 2014-04-25 00:02:10 -0700 REGRESSION: Local debug build of Safari cannot open a new tab 2014-04-26 00:01:58 -0700 1 1 1 Unclassified WebKit WebKit2 528+ (Nightly build) Unspecified Unspecified RESOLVED INVALID P2 Normal --- 1 rniwa webkit-unassigned andersca ap lforschler mrowe sam thorton oldest_to_newest 1003985 0 rniwa 2014-04-25 00:02:10 -0700 At r167792, WebProcess instantly hits the following assertion and never opens a tab: Crashed Thread: 0 Dispatch queue: com.apple.main-thread Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: KERN_INVALID_ADDRESS at 0x00000000bbadbeef VM Regions Near 0xbbadbeef: --> __TEXT 00000001020e9000-00000001020ea000 [ 4K] r-x/rwx SM=COW /System/Library/StagedFrameworks/Safari/WebKit2.framework/Versions/A/XPCServices/com.apple.WebKit.WebContent.xpc/Contents/MacOS/com.apple.WebKit.WebContent Thread 0 Crashed:: Dispatch queue: com.apple.main-thread 0 com.apple.JavaScriptCore 0x000000010488b0aa WTFCrash + 42 (Assertions.cpp:333) 1 com.apple.WebKit2 0x00000001028460d4 void IPC::handleMessage<Messages::WebProcess::CreateWebPage, WebKit::WebProcess, void (WebKit::WebProcess::*)(unsigned long long, WebKit::WebPageCreationParameters const&)>(IPC::MessageDecoder&, WebKit::WebProcess*, void (WebKit::WebProcess::*)(unsigned long long, WebKit::WebPageCreationParameters const&)) + 244 (HandleMessage.h:116) 2 com.apple.WebKit2 0x0000000102844877 WebKit::WebProcess::didReceiveWebProcessMessage(IPC::Connection*, IPC::MessageDecoder&) + 295 (WebProcessMessageReceiver.cpp:59) 3 com.apple.WebKit2 0x0000000102820698 WebKit::WebProcess::didReceiveMessage(IPC::Connection*, IPC::MessageDecoder&) + 168 (WebProcess.cpp:591) 4 com.apple.WebKit2 0x0000000102142e03 IPC::Connection::dispatchMessage(IPC::MessageDecoder&) + 51 (Connection.cpp:771) 5 com.apple.WebKit2 0x000000010213b170 IPC::Connection::dispatchMessage(std::__1::unique_ptr<IPC::MessageDecoder, std::__1::default_delete<IPC::MessageDecoder> >) + 368 (Connection.cpp:791) 6 com.apple.WebKit2 0x0000000102142b91 IPC::Connection::dispatchOneMessage() + 1377 (Connection.cpp:817) 7 com.apple.WebKit2 0x00000001021558b2 WTF::FunctionWrapper<void (IPC::Connection::*)()>::operator()(IPC::Connection*) + 114 (Functional.h:218) 8 com.apple.WebKit2 0x0000000102155835 WTF::BoundFunctionImpl<WTF::FunctionWrapper<void (IPC::Connection::*)()>, void (IPC::Connection*)>::operator()() + 53 (Functional.h:496) 9 com.apple.WebKit2 0x000000010215cbb2 WTF::Function<void ()>::operator()() const + 114 (Functional.h:704) 10 com.apple.WebKit2 0x000000010215cb2c std::__1::__function::__func<WTF::Function<void ()>, std::__1::allocator<WTF::Function<void ()> >, void ()>::operator()() + 60 (functional:1059) 11 com.apple.JavaScriptCore 0x00000001048b359a std::__1::function<void ()>::operator()() const + 26 (functional:1435) 12 com.apple.JavaScriptCore 0x00000001048c2b64 WTF::RunLoop::performWork() + 276 (RunLoop.cpp:106) 13 com.apple.JavaScriptCore 0x00000001048c4024 WTF::RunLoop::performWork(void*) + 36 (RunLoopCF.cpp:38) 14 com.apple.CoreFoundation 0x00007fff88697731 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17 (CFRunLoop.c:1767) 15 com.apple.CoreFoundation 0x00007fff88688ea2 __CFRunLoopDoSources0 + 242 (CFRunLoop.c:1792) 16 com.apple.CoreFoundation 0x00007fff8868862f __CFRunLoopRun + 831 (CFRunLoop.c:2513) 17 com.apple.CoreFoundation 0x00007fff886880b5 CFRunLoopRunSpecific + 309 (CFRunLoop.c:2770) 18 com.apple.HIToolbox 0x00007fff8634da0d RunCurrentEventLoopInMode + 226 (EventLoop.c:440) 19 com.apple.HIToolbox 0x00007fff8634d7b7 ReceiveNextEventCommon + 479 (EventBlocking.c:264) 20 com.apple.HIToolbox 0x00007fff8634d5bc _BlockUntilNextEventMatchingListInModeWithFilter + 65 (EventBlocking.c:161) 21 com.apple.AppKit 0x00007fff8da293de _DPSNextEvent + 1434 (CGDPSReplacement.m:458) 22 com.apple.AppKit 0x00007fff8da28a2b -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 122 (NSApplication.m:5085) 23 com.apple.AppKit 0x00007fff8da1cb2c -[NSApplication run] + 553 (NSApplication.m:3445) 24 com.apple.AppKit 0x00007fff8da07913 NSApplicationMain + 940 (NSApplication.m:9977) 25 com.apple.XPCService 0x00007fff89194c0f _xpc_main + 385 (XPCServiceMain.m:349) 26 libxpc.dylib 0x00007fff8a9ebbde xpc_main + 399 (init.c:1080) 27 com.apple.WebKit.WebContent 0x00000001020e9ba0 main + 16 (XPCServiceMain.mm:32) 28 libdyld.dylib 0x00007fff859435fd start + 1 1004152 1 ap 2014-04-25 11:30:27 -0700 I cannot reproduce this with r167808. 1004308 2 rniwa 2014-04-25 20:39:52 -0700 It looks like this is specific to run-safari. When I launch Safari from Xcode, I don't encounter this crash. 1004319 3 mrowe 2014-04-25 22:08:59 -0700 It looks like you're hitting: if (!decoder.decode(arguments)) { ASSERT(decoder.isInvalid()); Is that right? 1004321 4 ap 2014-04-25 23:01:15 -0700 Doesn't happen for me with run-safari either. Sounds like you may need to debug on your machine where it happens. What makes decode() return false? Or perhaps a clean rebuild would do it. 1004323 5 rniwa 2014-04-26 00:01:58 -0700 It does look like this is an issue with my local setup. I can't reproduce on my MBP either. Sorry about the noise.