UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3095.5 Safari/537.36

Steps to reproduce the problem:
1. Compile a debug build of Chromium with GCC 6 and use_sysroot = False

What is the expected behavior?
It runs without crashing.

What went wrong?
The renderer hits this DCHECK on startup:

30356:30763:0524/133123.275809:FATAL:task_queue_impl.h(75)] Check failed: sequence_num != other.sequence_num (2 vs. 2)

Thread 35 "Chrome_InProcRe" received signal SIGTRAP, Trace/breakpoint trap.                                                                                                                                        
[Switching to Thread 0x7fffa81a1700 (LWP 30763)]                                                                                                                
base::debug::(anonymous namespace)::DebugBreak () at ../../base/debug/debugger_posix.cc:232
232     }
(gdb) bt
#0  0x00007ffff766f577 in base::debug::(anonymous namespace)::DebugBreak() () at ../../base/debug/debugger_posix.cc:232
#1  0x00007ffff766f558 in base::debug::BreakDebugger() () at ../../base/debug/debugger_posix.cc:251
#2  0x00007ffff76e46f0 in logging::LogMessage::~LogMessage() (this=0x7fffa819dff0) at ../../base/logging.cc:783
#3  0x00007fffe3f6b52a in blink::scheduler::internal::TaskQueueImpl::DelayedWakeUp::operator<=(blink::scheduler::internal::TaskQueueImpl::DelayedWakeUp const&) const (this=0x3e77eb029d58, other=...)
    at ../../third_party/WebKit/Source/platform/scheduler/base/task_queue_impl.h:75
#4  0x00007fffe3f6aedd in blink::scheduler::TimeDomain::ScheduledDelayedWakeUp::operator<=(blink::scheduler::TimeDomain::ScheduledDelayedWakeUp const&) const (this=0x3e77eb029d58, other=...)
    at ../../third_party/WebKit/Source/platform/scheduler/base/time_domain.h:126
#5  0x00007fffe3f6bf4d in blink::scheduler::IntrusiveHeap<blink::scheduler::TimeDomain::ScheduledDelayedWakeUp>::CompareNodes(blink::scheduler::TimeDomain::ScheduledDelayedWakeUp const&, blink::scheduler::TimeDomain::ScheduledDelayedWakeUp const&) (a=..., b=...) at ../../third_party/WebKit/Source/platform/scheduler/base/intrusive_heap.h:161
#6  0x00007fffe3f6bff8 in std::is_heap_until<blink::scheduler::TimeDomain::ScheduledDelayedWakeUp const*, bool (*)(blink::scheduler::TimeDomain::ScheduledDelayedWakeUp const&, blink::scheduler::TimeDomain::ScheduledDelayedWakeUp const&)>(blink::scheduler::TimeDomain::ScheduledDelayedWakeUp const*, blink::scheduler::TimeDomain::ScheduledDelayedWakeUp const*, bool (*)(blink::scheduler::TimeDomain::ScheduledDelayedWakeUpconst&, blink::scheduler::TimeDomain::ScheduledDelayedWakeUp const&)) (__first=0x3e77eb029d58, __last=0x3e77eb029d70, __comp=
    0x7fffe3f6bf30 <blink::scheduler::IntrusiveHeap<blink::scheduler::TimeDomain::ScheduledDelayedWakeUp>::CompareNodes(blink::scheduler::TimeDomain::ScheduledDelayedWakeUp const&, blink::scheduler::TimeDomain::ScheduledDelayedWakeUp const&)>) at /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/bits/stl_heap.h:503
#7  0x00007fffe3f6beb5 in std::is_heap<blink::scheduler::TimeDomain::ScheduledDelayedWakeUp const*, bool (*)(blink::scheduler::TimeDomain::ScheduledDelayedWakeUp const&, blink::scheduler::TimeDomain::ScheduledDelayedWakeUp const&)>(blink::scheduler::TimeDomain::ScheduledDelayedWakeUp const*, blink::scheduler::TimeDomain::ScheduledDelayedWakeUp const*, bool (*)(blink::scheduler::TimeDomain::ScheduledDelayedWakeUp const&, blink::scheduler::TimeDomain::ScheduledDelayedWakeUp const&)) (__first=0x3e77eb029d58, __last=0x3e77eb029d70, __comp=
    0x7fffe3f6bf30 <blink::scheduler::IntrusiveHeap<blink::scheduler::TimeDomain::ScheduledDelayedWakeUp>::CompareNodes(blink::scheduler::TimeDomain::ScheduledDelayedWakeUp const&, blink::scheduler::TimeDomain::ScheduledDelayedWakeUp const&)>) at /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/bits/stl_heap.h:534
#8  0x00007fffe3f6bdd1 in blink::scheduler::IntrusiveHeap<blink::scheduler::TimeDomain::ScheduledDelayedWakeUp>::FillHole(unsigned long, blink::scheduler::TimeDomain::ScheduledDelayedWakeUp&&) (this=0x3e77e6a2b778, hole=1, element=<unknown type in /home/chr1s/src/chromium/chromium/src/out/Default/./libblink_platform.so, CU 0x2f1d7e2, DIE 0x2f2f605>)
    at ../../third_party/WebKit/Source/platform/scheduler/base/intrusive_heap.h:157
#9  0x00007fffe3f6b3f8 in blink::scheduler::IntrusiveHeap<blink::scheduler::TimeDomain::ScheduledDelayedWakeUp>::MoveHoleUpAndFillWithElement(unsigned long, blink::scheduler::TimeDomain::ScheduledDelayedWakeUp&&) (this=0x3e77e6a2b778, hole=1, element=<unknown type in /home/chr1s/src/chromium/chromium/src/out/Default/./libblink_platform.so, CU 0x2f1d7e2, DIE 0x2f2f3a7>)
    at ../../third_party/WebKit/Source/platform/scheduler/base/intrusive_heap.h:175
#10 0x00007fffe3f69dcd in blink::scheduler::IntrusiveHeap<blink::scheduler::TimeDomain::ScheduledDelayedWakeUp>::insert(blink::scheduler::TimeDomain::ScheduledDelayedWakeUp&&) (this=0x3e77e6a2b778, element=<unknown type in /home/chr1s/src/chromium/chromium/src/out/Default/./libblink_platform.so, CU 0x2f1d7e2, DIE 0x2f2da9e>) at ../../third_party/WebKit/Source/platform/scheduler/base/intrusive_heap.h:88
#11 0x00007fffe3f69304 in blink::scheduler::TimeDomain::ScheduleDelayedWork(blink::scheduler::internal::TaskQueueImpl*, blink::scheduler::internal::TaskQueueImpl::DelayedWakeUp, base::TimeTicks) (this=0x3e77e6a2b770, queue=0x3e77eb04ee20, wake_up=..., now=...) at ../../third_party/WebKit/Source/platform/scheduler/base/time_domain.cc:50
#12 0x00007fffe3f38689 in blink::scheduler::internal::TaskQueueImpl::ScheduleDelayedWorkInTimeDomain(base::TimeTicks) (this=0x3e77eb04ee20, now=...)
    at ../../third_party/WebKit/Source/platform/scheduler/base/task_queue_impl.cc:902
#13 0x00007fffe3f38470 in blink::scheduler::internal::TaskQueueImpl::PushOntoDelayedIncomingQueueFromMainThread(blink::scheduler::internal::TaskQueueImpl::Task, base::TimeTicks) (this=0x3e77eb04ee20, pending_task=..., now=...) at ../../third_party/WebKit/Source/platform/scheduler/base/task_queue_impl.cc:293
#14 0x00007fffe3f37ea9 in blink::scheduler::internal::TaskQueueImpl::PostDelayedTaskImpl(tracked_objects::Location const&, base::Callback<void (), (base::internal::CopyMode)0, (base::internal::RepeatMode)0>, base::TimeDelta, blink::scheduler::internal::TaskQueueImpl::TaskType) (this=0x3e77eb04ee20, from_here=..., task=..., delay=..., task_type=blink::scheduler::internal::TaskQueueImpl::TaskType::NORMAL)
    at ../../third_party/WebKit/Source/platform/scheduler/base/task_queue_impl.cc:254
#15 0x00007fffe3f37969 in blink::scheduler::internal::TaskQueueImpl::PostDelayedTask(tracked_objects::Location const&, base::Callback<void (), (base::internal::CopyMode)0, (base::internal::RepeatMode)0>, base::TimeDelta) (this=0x3e77eb04ee20, from_here=..., task=..., delay=...) at ../../third_party/WebKit/Source/platform/scheduler/base/task_queue_impl.cc:199
#16 0x00007fffefa630c1 in content::ChildThreadImpl::Init(content::ChildThreadImpl::Options const&) (this=0x3e77eb055828, options=...) at ../../content/child/child_thread_impl.cc:568
#17 0x00007fffefa636d6 in content::ChildThreadImpl::ChildThreadImpl(content::ChildThreadImpl::Options const&) (this=0x3e77eb055828, vtt=0x7ffff415f938 <VTT for content::RenderThreadImpl+24>, options=...)
    at ../../content/child/child_thread_impl.cc:382
#18 0x00007ffff1baa5b7 in content::RenderThreadImpl::RenderThreadImpl(content::InProcessChildThreadParams const&, std::unique_ptr<blink::scheduler::RendererScheduler, std::default_delete<blink::scheduler::RendererScheduler> >, scoped_refptr<base::SingleThreadTaskRunner> const&) (this=0x3e77eb055820, params=..., scheduler=
    std::unique_ptr<blink::scheduler::RendererScheduler> containing 0x3e77e7ffca20, resource_task_queue=...) at ../../content/renderer/render_thread_impl.cc:600
#19 0x00007ffff1baa493 in content::RenderThreadImpl::Create(content::InProcessChildThreadParams const&) (params=...) at ../../content/renderer/render_thread_impl.cc:548
#20 0x00007ffff1a3df15 in content::InProcessRendererThread::Init() (this=0x3e77eb033020) at ../../content/renderer/in_process_renderer_thread.cc:50
#21 0x00007ffff786e9b0 in base::Thread::ThreadMain() (this=0x3e77eb033020) at ../../base/threading/thread.cc:327
#22 0x00007ffff78556ca in base::(anonymous namespace)::ThreadFunc(void*) (params=0x3e77eb00dde0) at ../../base/threading/platform_thread_posix.cc:71
#23 0x00007ffff7bc06da in start_thread (arg=0x7fffa81a1700) at pthread_create.c:456
#24 0x00007fffddb9617f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Crashed report ID: 

How much crashed? Just one tab

Is it a problem with a plugin? No 

Did this work before? N/A 

Chrome version: 60.0.3095.5  Channel: canary
OS Version: 
Flash Version: 

The problem is that GCC 6 adds an additional runtime check in std::is_heap with debug builds (__glibcxx_requires_irreflexive_pred) that ends up calling the comparison function (blink::scheduler::IntrusiveHeap<blink::scheduler::TimeDomain::ScheduledDelayedWakeUp>::CompareNodes) with equal values.