[root /]# pstack 5413
pstack 5413
Thread 11 (Thread 0x7fd98865f700 (LWP 5420)):
#0  0x00007fd988756783 in epoll_wait () from /lib64/libc.so.6
#1  0x000000000156c86f in uv__io_poll () at ../deps/uv/src/unix/epoll.c:236
#2  0x000000000155ab98 in uv_run (loop=0x5923d88, mode=UV_RUN_DEFAULT) at ../deps/uv/src/unix/core.c:389
#3  0x0000000000b7430b in node::WorkerThreadsTaskRunner::DelayedTaskScheduler::Start()::{lambda(void*)#1}::_FUN(void*) ()
#4  0x00007fd988a28df3 in start_thread () from /lib64/libpthread.so.0
#5  0x00007fd9887561ad in clone () from /lib64/libc.so.6
Thread 10 (Thread 0x7fd987e5e700 (LWP 5421)):
#0  0x00007fd988a2ef7d in __lll_lock_wait () from /lib64/libpthread.so.0
#1  0x00007fd988a2ad41 in _L_lock_790 () from /lib64/libpthread.so.0
#2  0x00007fd988a2ac47 in pthread_mutex_lock () from /lib64/libpthread.so.0
#3  0x0000000000ebe909 in v8::internal::IndexGenerator::GetNext() ()
#4  0x0000000000f20954 in v8::internal::ScavengerCollector::JobTask::ConcurrentScavengePages(v8::internal::Scavenger*) ()
#5  0x0000000000f23eb4 in v8::internal::ScavengerCollector::JobTask::ProcessItems(v8::JobDelegate*, v8::internal::Scavenger*) ()
#6  0x0000000000f24000 in v8::internal::ScavengerCollector::JobTask::Run(v8::JobDelegate*) ()
#7  0x00000000018da9e4 in v8::platform::DefaultJobWorker::Run() ()
#8  0x0000000000b6f255 in node::(anonymous namespace)::PlatformWorkerThread(void*) ()
#9  0x00007fd988a28df3 in start_thread () from /lib64/libpthread.so.0
#10 0x00007fd9887561ad in clone () from /lib64/libc.so.6
Thread 9 (Thread 0x7fd98765d700 (LWP 5422)):
#0  0x00007fd988a2c705 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x0000000001568e99 in uv_cond_wait () at ../deps/uv/src/unix/thread.c:780
#2  0x0000000000b6f1cb in node::(anonymous namespace)::PlatformWorkerThread(void*) ()
#3  0x00007fd988a28df3 in start_thread () from /lib64/libpthread.so.0
#4  0x00007fd9887561ad in clone () from /lib64/libc.so.6
Thread 8 (Thread 0x7fd986e5c700 (LWP 5423)):
#0  0x00007fd988a2c705 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x0000000001568e99 in uv_cond_wait () at ../deps/uv/src/unix/thread.c:780
#2  0x0000000000b6f1cb in node::(anonymous namespace)::PlatformWorkerThread(void*) ()
#3  0x00007fd988a28df3 in start_thread () from /lib64/libpthread.so.0
#4  0x00007fd9887561ad in clone () from /lib64/libc.so.6
Thread 7 (Thread 0x7fd98665b700 (LWP 5424)):
#0  0x00007fd988a2c705 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x0000000001568e99 in uv_cond_wait () at ../deps/uv/src/unix/thread.c:780
#2  0x0000000000b6f1cb in node::(anonymous namespace)::PlatformWorkerThread(void*) ()
#3  0x00007fd988a28df3 in start_thread () from /lib64/libpthread.so.0
#4  0x00007fd9887561ad in clone () from /lib64/libc.so.6
Thread 6 (Thread 0x7fd98987d700 (LWP 5457)):
#0  0x00007fd988a2c705 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x0000000001568c9b in uv_cond_wait (mutex=0x5a1b400, cond=0x5a1b428) at ../deps/uv/src/unix/thread.c:780
#2  uv__custom_sem_wait (sem_=<optimized out>) at ../deps/uv/src/unix/thread.c:579
#3  uv_sem_wait (sem=<optimized out>) at ../deps/uv/src/unix/thread.c:680
#4  0x0000000000c0c3a5 in node::inspector::(anonymous namespace)::StartIoThreadMain(void*) ()
#5  0x00007fd988a28df3 in start_thread () from /lib64/libpthread.so.0
#6  0x00007fd9887561ad in clone () from /lib64/libc.so.6
Thread 5 (Thread 0x7fd985e5a700 (LWP 5474)):
#0  0x00007fd988a2c705 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x0000000001568e99 in uv_cond_wait () at ../deps/uv/src/unix/thread.c:780
#2  0x0000000001555474 in worker (arg=0x0) at ../deps/uv/src/threadpool.c:76
#3  0x00007fd988a28df3 in start_thread () from /lib64/libpthread.so.0
#4  0x00007fd9887561ad in clone () from /lib64/libc.so.6
Thread 4 (Thread 0x7fd985659700 (LWP 5475)):
#0  0x00007fd988a2c705 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x0000000001568e99 in uv_cond_wait () at ../deps/uv/src/unix/thread.c:780
#2  0x0000000001555474 in worker (arg=0x0) at ../deps/uv/src/threadpool.c:76
#3  0x00007fd988a28df3 in start_thread () from /lib64/libpthread.so.0
#4  0x00007fd9887561ad in clone () from /lib64/libc.so.6
Thread 3 (Thread 0x7fd984e58700 (LWP 5476)):
#0  0x00007fd988a2c705 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x0000000001568e99 in uv_cond_wait () at ../deps/uv/src/unix/thread.c:780
#2  0x0000000001555474 in worker (arg=0x0) at ../deps/uv/src/threadpool.c:76
#3  0x00007fd988a28df3 in start_thread () from /lib64/libpthread.so.0
#4  0x00007fd9887561ad in clone () from /lib64/libc.so.6
Thread 2 (Thread 0x7fd977fff700 (LWP 5481)):
#0  0x00007fd988a2c705 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x0000000001568e99 in uv_cond_wait () at ../deps/uv/src/unix/thread.c:780
#2  0x0000000001555474 in worker (arg=0x0) at ../deps/uv/src/threadpool.c:76
#3  0x00007fd988a28df3 in start_thread () from /lib64/libpthread.so.0
#4  0x00007fd9887561ad in clone () from /lib64/libc.so.6
Thread 1 (Thread 0x7fd98986f7c0 (LWP 5413)):
#0  0x00007fd988a2c705 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00000000018e47a9 in v8::platform::DefaultJobState::WaitForParticipationOpportunityLockRequired() ()
#2  0x00000000018e4886 in v8::platform::DefaultJobState::Join() ()
#3  0x00000000018e48e3 in v8::platform::DefaultJobHandle::Join() ()
#4  0x0000000000f25193 in v8::internal::ScavengerCollector::CollectGarbage() ()
#5  0x0000000000ea63c5 in v8::internal::Heap::Scavenge() ()
#6  0x0000000000eb47f0 in v8::internal::Heap::PerformGarbageCollection(v8::internal::GarbageCollector, v8::GCCallbackFlags) [clone .constprop.1309] ()
#7  0x0000000000eb51d0 in v8::internal::Heap::CollectGarbage(v8::internal::AllocationSpace, v8::internal::GarbageCollectionReason, v8::GCCallbackFlags) ()
#8  0x0000000000f18714 in v8::internal::ScavengeJob::Task::RunInternal() ()
#9  0x0000000000dabbcb in non-virtual thunk to v8::internal::CancelableTask::Run() ()
#10 0x0000000000b70704 in node::PerIsolatePlatformData::RunForegroundTask(std::unique_ptr<v8::Task, std::default_delete<v8::Task> >) ()
#11 0x0000000000b72569 in node::PerIsolatePlatformData::FlushForegroundTasksInternal() ()
#12 0x000000000155a266 in uv__async_io.part.1 () at ../deps/uv/src/unix/async.c:163
#13 0x000000000156c6d4 in uv__io_poll () at ../deps/uv/src/unix/epoll.c:374
#14 0x000000000155ab98 in uv_run (loop=0x4883c20 <default_loop_struct>, mode=UV_RUN_DEFAULT) at ../deps/uv/src/unix/core.c:389
#15 0x0000000000a3ffe5 in node::SpinEventLoop(node::Environment*) ()
#16 0x0000000000b45046 in node::NodeMainInstance::Run(node::EnvSerializeInfo const*) ()
#17 0x0000000000ac67e2 in node::Start(int, char**) ()
#18 0x00007fd988681af5 in __libc_start_main () from /lib64/libc.so.6
#19 0x0000000000a3bfbc in _start ()