can't debug renderer process, track trap error

[yu wang]

HI, i have successfully compiled chromium on my mac and debugged main process,

but when i want to debug renderer process, use --renderer-startup-dialog flag, and attached the renderer process id in the lldb, then chromium crashed, here is the out put :

wy@yuwangs-mbp-2 chromium % src/out/Default/Chromium.app/Contents/MacOS/Chromium  --renderer-startup-dialog --renderer-process-limit=1

[21432:775:1205/162642.250869:INFO:content_main_runner_impl.cc(1006)] Chrome is running in full browser mode.

[21432:775:1205/162643.962869:WARNING:account_consistency_mode_manager.cc(63)] Desktop Identity Consistency cannot be enabled as no OAuth client ID and client secret have been configured.

[21469:775:1205/162648.497530:WARNING:vt_video_decode_accelerator_mac.cc(267)] VTDecompressionSessionCreate(): Error Domain=NSOSStatusErrorDomain Code=-12906 "(null)" (-12906)

[21478:775:1205/162650.584462:ERROR:content_switches_internal.cc(112)] Renderer (21478) paused waiting for debugger to attach. Send SIGUSR1 to unpause.

[21469:775:1205/162748.357016:WARNING:ca_layer_tree_coordinator.mm(54)] Blank frame: No overlays or CALayers

[21432:775:1205/162809.772377:FATAL:scoped_observation.h(69)] Check failed: source_ != nullptr (0x0 vs. nullptr)

0   libbase.dylib                       0x000000010c0db1cf base::debug::CollectStackTrace(void**, unsigned long) + 31

1   libbase.dylib                       0x000000010bdea718 base::debug::StackTrace::StackTrace(unsigned long) + 72

2   libbase.dylib                       0x000000010bdea79d base::debug::StackTrace::StackTrace(unsigned long) + 29

3   libbase.dylib                       0x000000010bdea775 base::debug::StackTrace::StackTrace() + 37

4   libbase.dylib                       0x000000010be3fad3 logging::LogMessage::~LogMessage() + 179

5   libbase.dylib                       0x000000010be40a35 logging::LogMessage::~LogMessage() + 21

6   libbase.dylib                       0x000000010be40a59 logging::LogMessage::~LogMessage() + 25

7   libbase.dylib                       0x000000010bda800b logging::CheckError::~CheckError() + 43

8   libbase.dylib                       0x000000010bda7ac5 logging::CheckError::~CheckError() + 21

9   libchrome_dll.dylib                 0x000000011e3e1763 base::ScopedObservation<content::RenderProcessHost, content::RenderProcessHostObserver, &(content::RenderProcessHost::AddObserver(content::RenderProcessHostObserver*)), &(content::RenderProcessHost::RemoveObserver(content::RenderProcessHostObserver*))>::RemoveObservation() + 147

10  libchrome_dll.dylib                 0x000000011eeb167d HungPagesTableModel::Reset() + 29

11  libchrome_dll.dylib                 0x000000011eeb3978 HungRendererDialogView::CloseDialogWithNoAction() + 40

12  libchrome_dll.dylib                 0x000000011eeb392a HungRendererDialogView::EndForWebContents(content::WebContents*, content::RenderWidgetHost*) + 218

13  libchrome_dll.dylib                 0x000000011eeb2465 HungRendererDialogView::Hide(content::WebContents*, content::RenderWidgetHost*) + 69

14  libchrome_dll.dylib                 0x000000011f06a031 TabDialogsViews::HideHungRendererDialog(content::RenderWidgetHost*) + 33

15  libchrome_dll.dylib                 0x000000011e78ff4a Browser::RendererResponsive(content::WebContents*, content::RenderWidgetHost*) + 42

16  libcontent.dylib                    0x000000014ee51139 content::WebContentsImpl::RendererResponsive(content::RenderWidgetHostImpl*) + 329

17  libcontent.dylib                    0x000000014e8a2488 content::RenderWidgetHostImpl::RendererIsResponsive() + 72

18  libcontent.dylib                    0x000000014e89ee49 content::RenderWidgetHostImpl::StopInputEventAckTimeout() + 41

19  libcontent.dylib                    0x000000014e89eb12 content::RenderWidgetHostImpl::WasHidden() + 322

20  libcontent.dylib                    0x000000014f026ab4 content::RenderWidgetHostViewMac::WasOccluded() + 68

21  libcontent.dylib                    0x000000014ee0ce2c content::WebContentsImpl::UpdateVisibilityAndNotifyPageAndView(content::Visibility) + 924

22  libcontent.dylib                    0x000000014ee5afd8 content::WebContentsImpl::UpdateWebContentsVisibility(content::Visibility) + 456

23  libcontent.dylib                    0x000000014f052e77 content::WebContentsViewMac::OnWindowVisibilityChanged(remote_cocoa::mojom::Visibility) + 183

24  libcontent.dylib                    0x000000014f27fd1d -[WebContentsViewCocoa updateWebContentsVisibility] + 237

25  libcontent.dylib                    0x000000014f280415 -[WebContentsViewCocoa windowChangedOcclusionState:] + 37

26  CoreFoundation                      0x00007fff20412fdc __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 12

27  CoreFoundation                      0x00007fff204ae89b ___CFXRegistrationPost_block_invoke + 49

28  CoreFoundation                      0x00007fff204ae80f _CFXRegistrationPost + 454

29  CoreFoundation                      0x00007fff203e3bce _CFXNotificationPost + 723

30  Foundation                          0x00007fff2114fabe -[NSNotificationCenter postNotificationName:object:userInfo:] + 59

31  AppKit                              0x00007fff234e9ed6 _withUncaughtExceptionHandler + 9

32  AppKit                              0x00007fff22eaf60f _windowBecameOccluded + 77

33  SkyLight                            0x00007fff24b9a685 (anonymous namespace)::notify_datagram_handler(unsigned int, CGSDatagramType, void*, unsigned long, void*) + 1071

34  SkyLight                            0x00007fff24e3639c CGSDatagramReadStream::dispatchMainQueueDatagrams() + 202

35  SkyLight                            0x00007fff24e362c3 ___ZN21CGSDatagramReadStream15mainQueueWakeupEv_block_invoke + 18

36  libdispatch.dylib                   0x00007fff201795dd _dispatch_call_block_and_release + 12

37  libdispatch.dylib                   0x00007fff2017a7c7 _dispatch_client_callout + 8

38  libdispatch.dylib                   0x00007fff20186b86 _dispatch_main_queue_callback_4CF + 940

39  CoreFoundation                      0x00007fff2045a960 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9

40  CoreFoundation                      0x00007fff2041c842 __CFRunLoopRun + 2731

41  CoreFoundation                      0x00007fff2041b6be CFRunLoopRunSpecific + 563

42  HIToolbox                           0x00007fff28687fd0 RunCurrentEventLoopInMode + 292

43  HIToolbox                           0x00007fff28687dcc ReceiveNextEventCommon + 709

44  HIToolbox                           0x00007fff28687aef _BlockUntilNextEventMatchingListInModeWithFilter + 64

45  AppKit                              0x00007fff22c34f85 _DPSNextEvent + 883

46  AppKit                              0x00007fff22c3374b -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 1366

47  libchrome_dll.dylib                 0x000000011b0f9e1b __71-[BrowserCrApplication nextEventMatchingMask:untilDate:inMode:dequeue:]_block_invoke + 91

48  libbase.dylib                       0x000000010c110ca2 base::mac::CallWithEHFrame(void () block_pointer) + 10

49  libchrome_dll.dylib                 0x000000011b0f9cd8 -[BrowserCrApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 312

50  AppKit                              0x00007fff22c25bda -[NSApplication run] + 586

51  libbase.dylib                       0x000000010c12fdcf base::MessagePumpNSApplication::DoRun(base::MessagePump::Delegate*) + 255

52  libbase.dylib                       0x000000010c12d717 base::MessagePumpCFRunLoopBase::Run(base::MessagePump::Delegate*) + 167

53  libbase.dylib                       0x000000010c003964 base::sequence_manager::internal::ThreadControllerWithMessagePumpImpl::Run(bool, base::TimeDelta) + 580

54  libbase.dylib                       0x000000010bf2cf16 base::RunLoop::Run() + 678

55  libchrome_dll.dylib                 0x000000011a2f855c ChromeBrowserMainParts::MainMessageLoopRun(int*) + 236

56  libcontent.dylib                    0x000000014d8024f0 content::BrowserMainLoop::RunMainMessageLoopParts() + 80

57  libcontent.dylib                    0x000000014d810bfd content::BrowserMainRunnerImpl::Run() + 253

58  libcontent.dylib                    0x000000014d7fc9a3 content::BrowserMain(content::MainFunctionParams const&) + 211

59  libcontent.dylib                    0x000000015001a65f content::RunBrowserProcessMain(content::MainFunctionParams const&, content::ContentMainDelegate*) + 127

60  libcontent.dylib                    0x000000015001bf3f content::ContentMainRunnerImpl::RunServiceManager(content::MainFunctionParams&, bool) + 1647

61  libcontent.dylib                    0x000000015001b7fa content::ContentMainRunnerImpl::Run(bool) + 618

62  libcontent.dylib                    0x00000001500174ee content::RunContentProcess(content::ContentMainParams const&, content::ContentMainRunner*) + 974

63  libcontent.dylib                    0x00000001500181ab content::ContentMain(content::ContentMainParams const&) + 75

64  libchrome_dll.dylib                 0x0000000116d74421 ChromeMain + 369

65  Chromium                            0x00000001089671c7 main + 567

66  libdyld.dylib                       0x00007fff20340631 start + 1

67  ???                                 0x0000000000000003 0x0 + 3

zsh: trace trap  src/out/Default/Chromium.app/Contents/MacOS/Chromium --renderer-startup-dialog

===== output of lldb =====

wy@yuwangs-mbp-2 chromium % lldb

(lldb) process attach --pid 21478

Process 21478 stopped

* thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGSTOP

    frame #0: 0x00007fff20313002 libsystem_kernel.dylib`__sigsuspend + 10

libsystem_kernel.dylib`__sigsuspend:

->  0x7fff20313002 <+10>: jae    0x7fff2031300c            ; <+20>

    0x7fff20313004 <+12>: movq   %rax, %rdi

    0x7fff20313007 <+15>: jmp    0x7fff202f229d            ; cerror

    0x7fff2031300c <+20>: retq   

Target 0: (Chromium Helper (Renderer)) stopped.

Executable module set to "/Users/wy/Workspace/chromium/src/out/Default/Chromium.app/Contents/Frameworks/Chromium Framework.framework/Versions/89.0.4332.0/Helpers/Chromium Helper (Renderer).app/Contents/MacOS/Chromium Helper (Renderer)".

Architecture set to: x86_64h-apple-macosx-.

(lldb) 

[Stefan Zager]

Two things:

1. Make sure your command line includes these flags: --no-sandbox --disable-hang-monitor

2. After you attach to the renderer process, you need to signal it to continue by doing this from a terminal window:

$ kill -s SIGUSR1 <renderer pid>

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[yu wang]

Hi, Stefan

Recently I have upgraded my computer to 20-core and 64GB RAM, and it works great!

Now, I can debug the renderer process quite well, I think maybe the crash has something to do with my 8GB RAM MacBook pro (that's really not enough for lldb to work : ) )

anyway, thank you very much for your kindly help!