Thread 9 (Thread 0x7f4de836b700 (LWP 3234)):
#0  sem_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S:85
#1  0x0000000000fc8188 in v8::base::Semaphore::Wait() ()
#2  0x0000000000e65949 in v8::platform::TaskQueue::GetNext() ()
#3  0x0000000000e65a9c in v8::platform::WorkerThread::Run() ()
#4  0x0000000000fc9140 in v8::base::ThreadEntry(void*) ()
#5  0x00007f4de871f0a4 in start_thread (arg=0x7f4de836b700) at pthread_create.c:309
#6  0x00007f4de845487d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 8 (Thread 0x7f4de7b6a700 (LWP 3235)):
#0  sem_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S:85
#1  0x0000000000fc8188 in v8::base::Semaphore::Wait() ()
#2  0x0000000000e65949 in v8::platform::TaskQueue::GetNext() ()
#3  0x0000000000e65a9c in v8::platform::WorkerThread::Run() ()
#4  0x0000000000fc9140 in v8::base::ThreadEntry(void*) ()
#5  0x00007f4de871f0a4 in start_thread (arg=0x7f4de7b6a700) at pthread_create.c:309
#6  0x00007f4de845487d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 7 (Thread 0x7f4de7369700 (LWP 3236)):
#0  sem_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S:85
#1  0x0000000000fc8188 in v8::base::Semaphore::Wait() ()
#2  0x0000000000e65949 in v8::platform::TaskQueue::GetNext() ()
#3  0x0000000000e65a9c in v8::platform::WorkerThread::Run() ()
#4  0x0000000000fc9140 in v8::base::ThreadEntry(void*) ()
#5  0x00007f4de871f0a4 in start_thread (arg=0x7f4de7369700) at pthread_create.c:309
#6  0x00007f4de845487d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 6 (Thread 0x7f4de6b68700 (LWP 3237)):
#0  sem_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S:85
#1  0x0000000000fc8188 in v8::base::Semaphore::Wait() ()
#2  0x0000000000e65949 in v8::platform::TaskQueue::GetNext() ()
#3  0x0000000000e65a9c in v8::platform::WorkerThread::Run() ()
#4  0x0000000000fc9140 in v8::base::ThreadEntry(void*) ()
#5  0x00007f4de871f0a4 in start_thread (arg=0x7f4de6b68700) at pthread_create.c:309
#6  0x00007f4de845487d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 6 (Thread 0x7f4de6b68700 (LWP 3237)):
#0  sem_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S:85
#1  0x0000000000fc8188 in v8::base::Semaphore::Wait() ()
#2  0x0000000000e65949 in v8::platform::TaskQueue::GetNext() ()
#3  0x0000000000e65a9c in v8::platform::WorkerThread::Run() ()
#4  0x0000000000fc9140 in v8::base::ThreadEntry(void*) ()
#5  0x00007f4de871f0a4 in start_thread (arg=0x7f4de6b68700) at pthread_create.c:309
#6  0x00007f4de845487d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 5 (Thread 0x7f4de5266700 (LWP 3238)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x0000000000fbe709 in uv_cond_wait (cond=cond@entry=0x19aa020 <cond>, mutex=mutex@entry=0x19a9fe0 <mutex>) at ../deps/uv/src/unix/thread.c:380
#2  0x0000000000faf5d8 in worker (arg=arg@entry=0x0) at ../deps/uv/src/threadpool.c:75
#3  0x0000000000fbe269 in uv__thread_start (arg=<optimized out>) at ../deps/uv/src/unix/thread.c:49
#4  0x00007f4de871f0a4 in start_thread (arg=0x7f4de5266700) at pthread_create.c:309
#5  0x00007f4de845487d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 4 (Thread 0x7f4de4a65700 (LWP 3239)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x0000000000fbe709 in uv_cond_wait (cond=cond@entry=0x19aa020 <cond>, mutex=mutex@entry=0x19a9fe0 <mutex>) at ../deps/uv/src/unix/thread.c:380
#2  0x0000000000faf5d8 in worker (arg=arg@entry=0x0) at ../deps/uv/src/threadpool.c:75
#3  0x0000000000fbe269 in uv__thread_start (arg=<optimized out>) at ../deps/uv/src/unix/thread.c:49
#4  0x00007f4de871f0a4 in start_thread (arg=0x7f4de4a65700) at pthread_create.c:309
#5  0x00007f4de845487d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 3 (Thread 0x7f4dd7fff700 (LWP 3240)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x0000000000fbe709 in uv_cond_wait (cond=cond@entry=0x19aa020 <cond>, mutex=mutex@entry=0x19a9fe0 <mutex>) at ../deps/uv/src/unix/thread.c:380
#2  0x0000000000faf5d8 in worker (arg=arg@entry=0x0) at ../deps/uv/src/threadpool.c:75
#3  0x0000000000fbe269 in uv__thread_start (arg=<optimized out>) at ../deps/uv/src/unix/thread.c:49
#4  0x00007f4de871f0a4 in start_thread (arg=0x7f4dd7fff700) at pthread_create.c:309
#5  0x00007f4de845487d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 2 (Thread 0x7f4dd77fe700 (LWP 3241)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x0000000000fbe709 in uv_cond_wait (cond=cond@entry=0x19aa020 <cond>, mutex=mutex@entry=0x19a9fe0 <mutex>) at ../deps/uv/src/unix/thread.c:380
#2  0x0000000000faf5d8 in worker (arg=arg@entry=0x0) at ../deps/uv/src/threadpool.c:75
#3  0x0000000000fbe269 in uv__thread_start (arg=<optimized out>) at ../deps/uv/src/unix/thread.c:49
#4  0x00007f4de871f0a4 in start_thread (arg=0x7f4dd77fe700) at pthread_create.c:309
#5  0x00007f4de845487d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 1 (Thread 0x7f4de9773740 (LWP 3233)):
#0  0x00001ca7c9b0718c in ?? ()
#1  0xffffffffffffba4a in ?? ()
#2  0xfffffffffffff733 in ?? ()
#3  0xffffffffffffc3b0 in ?? ()
#4  0xffffffffffffbd72 in ?? ()
#5  0xffffffffffffba4a in ?? ()
#6  0xffffffffffffba4b in ?? ()
#7  0xffffffffffffba4a in ?? ()
#8  0x0000000000000000 in ?? ()