Version: r394418 (d7fe10fcc032b07ab22402fafc17bd31b01622e5)
OS: Linux (Ubuntu trusty)

What steps will reproduce the problem?
(1) Make a debug build (gn: is_debug = true).
(2) Run the debug-renderer script, which uses --renderer-startup-dialog to pause the renderer.

    $ third_party/WebKit/Tools/Scripts/debug-renderer out/Default/content_shell https://www.google.com/

(3) Wait for (gdb) prompt, then run "signal SIGUSR1" to resume.

What is the expected output?
When "signal SIGUSR1" is used to resume the renderer, program execution continues.

What do you see instead?
Program terminates in content::ChildThreadImpl::EnsureConnected (because OnChannelConnected was not called before the timeout).

Locally reverting the change to switch to ChannelMojo (https://chromium.googlesource.com/chromium/src/+/88c27242702c9c3d1fb5cd29d9cd9cf099bfa5ec) fixes the issue, so I assume there is a difference in how the Mojo IPC channel implementation invokes IPC::Listener::OnChannelConnected.


gdb output:

(gdb) signal SIGUSR1
Continuing with signal SIGUSR1.
[25889:25889:0518/120937:538627849530:INFO:child_thread_impl.cc(723)] ChildThreadImpl::EnsureConnected()
[New Thread 0x7f47c4a6f700 (LWP 25942)]
[New Thread 0x7f47c5270700 (LWP 25941)]
[New Thread 0x7f47c5a71700 (LWP 25940)]
[New Thread 0x7f47c6272700 (LWP 25939)]
[New Thread 0x7f47c6a73700 (LWP 25938)]
[New Thread 0x7f47c7274700 (LWP 25937)]
[New Thread 0x7f47c7a75700 (LWP 25936)]

Program received signal SIGTERM, Terminated.
0x00007f47d24c8fb7 in kill () at ../sysdeps/unix/syscall-template.S:81
81      ../sysdeps/unix/syscall-template.S: No such file or directory.
(gdb) bt 10
#0  0x00007f47d24c8fb7 in kill () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f47e260f9d9 in base::Process::Terminate (this=0x7ffd4c47ef70, exit_code=0, wait=false) at ../../base/process/process_posix.cc:303
#2  0x00007f47e32a8d21 in content::ChildThreadImpl::EnsureConnected (this=0x2dad05f7ea28) at ../../content/child/child_thread_impl.cc:724
#3  0x00007f47e31fdd50 in base::internal::RunnableAdapter<void (content::GpuWatchdogThread::*)()>::Run<content::GpuWatchdogThread*>(content::GpuWatchdogThread*&&) (this=0x7ffd4c47f170, receiver_ptr=<unknown type in /src/chromium/src/out/Default/./libcontent.so, CU 0x0, DIE 0xe0f5>) at ../../base/bind_internal.h:186
#4  0x00007f47e31fdcb5 in base::internal::InvokeHelper<true, void, base::internal::RunnableAdapter<void (content::GpuWatchdogThread::*)()> >::MakeItSo<base::WeakPtr<content::GpuWatchdogThread>>(base::internal::RunnableAdapter<void (content::GpuWatchdogThread::*)()>, base::WeakPtr<content::GpuWatchdogThread>) (
    runnable=..., weak_ptr=base::WeakPtr((content::RenderThreadImpl *)0x2dad05f7ea28)) at ../../base/bind_internal.h:324
#5  0x00007f47e32af1cd in base::internal::Invoker<base::IndexSequence<0ul>, base::internal::BindState<base::internal::RunnableAdapter<void (content::ChildThreadImpl::*)()>, void (content::ChildThreadImpl*), base::WeakPtr<content::ChildThreadImpl> >, base::internal::InvokeHelper<true, void, base::internal::RunnableAdapter<void (content::ChildThreadImpl::*)()> >, void ()>::Run(base::internal::BindStateBase*) (base=0x2dad05e492c0) at ../../base/bind_internal.h:362
#6  0x00007f47e24d19ee in base::Callback<void (), (base::internal::CopyMode)1>::Run() const (this=0x7ffd4c47f4d0) at ../../base/callback.h:397
#7  0x00007f47e24f730e in base::debug::TaskAnnotator::RunTask (this=0x2dad05e96940, queue_function=0x7f47d7e84362 "TaskQueueManager::PostTask", 
    pending_task=From Init()@../../content/child/child_thread_impl.cc:487 = {...}) at ../../base/debug/task_annotator.cc:51
#8  0x00007f47d7e38fb4 in scheduler::TaskQueueManager::ProcessTaskFromWorkQueue (this=0x2dad05e96820, work_queue=0x2dad05c57da0, 
    out_previous_task=0x7ffd4c47f798) at ../../components/scheduler/base/task_queue_manager.cc:289
Python Exception <class 'gdb.error'> There is no member or method named ticks_.: 
#9  0x00007f47d7e36ef2 in scheduler::TaskQueueManager::DoWork (this=0x2dad05e96820, run_time=..., from_main_thread=true)
    at ../../components/scheduler/base/task_queue_manager.cc:201
(More stack frames follow...)