Product name: Chrome_Mac
Magic Signature: page_load_metrics::PageLoadTracker::UpdateChildFrameMetadata

Current link:
https://crash.corp.google.com/browse?q=product.name%3D'Chrome_Mac'%20AND%20product.version%3D'59.0.3063.0'%20AND%20custom_data.ChromeCrashProto.channel%3D'canary'%20AND%20custom_data.ChromeCrashProto.ptype%3D'browser'%20AND%20custom_data.ChromeCrashProto.magic_signature_1.name%3D'page_load_metrics%3A%3APageLoadTracker%3A%3AUpdateChildFrameMetadata'%20AND%20ReportID%3D'0848a29640000000'&ignore_case=false&enable_rewrite=true&omit_field_name=&omit_field_value=&omit_field_opt=%3D#3


Search properties:
product.name: Chrome_Mac
product.version: 59.0.3063.0
custom_data.chromecrashproto.channel: canary
custom_data.chromecrashproto.ptype: browser
custom_data.chromecrashproto.magic_signature_1.name: page_load_metrics::PageLoadTracker::UpdateChildFrameMetadata
reportid: 0848a29640000000

Metadata :
Product Name: Chrome_Mac
Product Version: 59.0.3063.0
Report ID: 0848a29640000000
Report Time: Wed, 05 Apr 2017 09:08:14 GMT
Uptime: 4000 ms
Cumulative Uptime: 0 ms
User Email: 
OS Name: Mac OS X
OS Version: 10.11.5 15F34
CPU Architecture: amd64
CPU Info: family 6 model 69 stepping 1

Stack trace:
============
Thread 0 CRASHED [EXC_BAD_ACCESS / KERN_INVALID_ADDRESS @ 0x00000274 ] MAGIC SIGNATURE THREAD
Stack Quality77%Show frame trust levels
0x000000010bfc4e93	(Google Chrome Framework -page_load_tracker.cc:515 )	page_load_metrics::PageLoadTracker::UpdateChildFrameMetadata(page_load_metrics::PageLoadMetadata const&)
0x000000010bfb76b6	(Google Chrome Framework -ipc_message_templates.h:40 )	bool IPC::MessageT<PageLoadMetricsMsg_TimingUpdated_Meta, std::__1::tuple<page_load_metrics::PageLoadTiming, page_load_metrics::PageLoadMetadata>, void>::Dispatch<page_load_metrics::MetricsWebContentsObserver, page_load_metrics::MetricsWebContentsObserver, content::RenderFrameHost, void (page_load_metrics::MetricsWebContentsObserver::*)(content::RenderFrameHost*, page_load_metrics::PageLoadTiming const&, page_load_metrics::PageLoadMetadata const&)>(IPC::Message const*, page_load_metrics::MetricsWebContentsObserver*, page_load_metrics::MetricsWebContentsObserver*, content::RenderFrameHost*, void (page_load_metrics::MetricsWebContentsObserver::*)(content::RenderFrameHost*, page_load_metrics::PageLoadTiming const&, page_load_metrics::PageLoadMetadata const&))
0x000000010bfb75bc	(Google Chrome Framework -metrics_web_contents_observer.cc:129 )	page_load_metrics::MetricsWebContentsObserver::OnMessageReceived(IPC::Message const&, content::RenderFrameHost*)
0x000000010b079f1c	(Google Chrome Framework -web_contents_impl.cc:738 )	content::WebContentsImpl::OnMessageReceived(content::RenderFrameHostImpl*, IPC::Message const&)
0x000000010ae11c7f	(Google Chrome Framework -render_frame_host_impl.cc:726 )	content::RenderFrameHostImpl::OnMessageReceived(IPC::Message const&)
0x000000010c8d232a	(Google Chrome Framework -ipc_channel_proxy.cc:329 )	IPC::ChannelProxy::Context::OnDispatchMessage(IPC::Message const&)
0x000000010c32ca70	(Google Chrome Framework -callback.h:91 )	base::debug::TaskAnnotator::RunTask(char const*, base::PendingTask*)
0x000000010c35261a	(Google Chrome Framework -message_loop.cc:423 )	base::MessageLoop::RunTask(base::PendingTask*)
0x000000010c35296b	(Google Chrome Framework -message_loop.cc:434 )	base::MessageLoop::DeferOrRunPendingTask(base::PendingTask)
0x000000010c352d32	(Google Chrome Framework -message_loop.cc:527 )	base::MessageLoop::DoWork()
0x000000010c3561d9	(Google Chrome Framework -message_pump_mac.mm:420 )	base::MessagePumpCFRunLoopBase::RunWork()
0x000000010c346b49	(Google Chrome Framework + 0x01af1b49 )	base::mac::CallWithEHFrame(void () block_pointer)
0x000000010c355bfe	(Google Chrome Framework -message_pump_mac.mm:396 )	base::MessagePumpCFRunLoopBase::RunWorkSource(void*)
0x00007fff9dfb5880	(CoreFoundation + 0x000aa880 )	__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__
0x00007fff9df94fbb	(CoreFoundation + 0x00089fbb )	__CFRunLoopDoSources0
0x00007fff9df944de	(CoreFoundation + 0x000894de )	__CFRunLoopRun
0x00007fff9df93ed7	(CoreFoundation + 0x00088ed7 )	CFRunLoopRunSpecific
0x00007fff9c996934	(HIToolbox + 0x00030934 )	RunCurrentEventLoopInMode
0x00007fff9c99676e	(HIToolbox + 0x0003076e )	ReceiveNextEventCommon
0x00007fff9c9965ae	(HIToolbox + 0x000305ae )	_BlockUntilNextEventMatchingListInModeWithFilter
0x00007fff96a1ddf5	(AppKit + 0x00048df5 )	_DPSNextEvent
0x00007fff96a1d225	(AppKit + 0x00048225 )	-[NSApplication _nextEventMatchingEventMask:untilDate:inMode:dequeue:]
0x000000010beea7af	(Google Chrome Framework -chrome_browser_application_mac.mm:187 )	__71-[BrowserCrApplication nextEventMatchingMask:untilDate:inMode:dequeue:]_block_invoke
0x000000010c346b49	(Google Chrome Framework + 0x01af1b49 )	base::mac::CallWithEHFrame(void () block_pointer)
0x000000010beea6f3	(Google Chrome Framework -chrome_browser_application_mac.mm:186 )	-[BrowserCrApplication nextEventMatchingMask:untilDate:inMode:dequeue:]
0x00007fff96a11d7f	(AppKit + 0x0003cd7f )	-[NSApplication run]
0x000000010c356a1d	(Google Chrome Framework -message_pump_mac.mm:755 )	base::MessagePumpNSApplication::DoRun(base::MessagePump::Delegate*)
0x000000010c35603b	(Google Chrome Framework -message_pump_mac.mm:292 )	base::MessagePumpCFRunLoopBase::Run(base::MessagePump::Delegate*)
0x000000010c374842	(Google Chrome Framework -run_loop.cc:37 )	base::RunLoop::Run()
0x000000010bef04a4	(Google Chrome Framework -chrome_browser_main.cc:1970 )	ChromeBrowserMainParts::MainMessageLoopRun(int*)
0x000000010ad1f473	(Google Chrome Framework -browser_main_loop.cc:1173 )	content::BrowserMainLoop::RunMainMessageLoopParts()
0x000000010ad21d11	(Google Chrome Framework -browser_main_runner.cc:140 )	content::BrowserMainRunnerImpl::Run()
0x000000010ad1b32b	(Google Chrome Framework -browser_main.cc:46 )	content::BrowserMain(content::MainFunctionParams const&)
0x000000010bea60af	(Google Chrome Framework -content_main_runner.cc:729 )	content::ContentMainRunnerImpl::Run()
0x000000010d64f8eb	(Google Chrome Framework -main.cc:179 )	service_manager::Main(service_manager::MainParams const&)
0x000000010bea5693	(Google Chrome Framework -content_main.cc:19 )	content::ContentMain(content::ContentMainParams const&)
0x000000010a857ee6	(Google Chrome Framework -chrome_main.cc:123 )	ChromeMain
0x000000010a5eed99	(Google Chrome Canary + 0x00000d99 )	
0x00007fff897da5ac	(libdyld.dylib + 0x000035ac )	start
0x00007fff897da5ac	(libdyld.dylib + 0x000035ac )	start

Link to the list of the builds:
================================
https://crash.corp.google.com/browse?q=custom_data.ChromeCrashProto.magic_signature_1.name%3D%27page_load_metrics%3A%3APageLoadTracker%3A%3AUpdateChildFrameMetadata%27&ignore_case=false&enable_rewrite=true&omit_field_name=&omit_field_value=&omit_field_opt=%3D

Note:
=====
1. This is #1 browser crash on the latest canary(59.0.3063.0) of Mac live for 3 hours. 26 crashes from 26 clients reported so far and spiking consistently.
2. Windows canary(59.0.3063.0) crash data is not available. Will update the behavior once its available.

Considering below as the changelog:
====================================
https://chromium.googlesource.com/chromium/src/+log/59.0.3062.0..59.0.3063.0?pretty=fuller&n=10000

Suspecting: https://codereview.chromium.org/2795283003 for 'metrics_web_contents_observer.cc' related change.

nasko@: Could you please take a look at these crashes.

Thank you!