.
Thread 6 (Thread 0x7ff9777fe700 (LWP 4955)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
No locals.
#1  0x000000000046ced9 in uv_cond_wait ()
No symbol table info available.
#2  0x000000000046d09f in ?? ()
No symbol table info available.
#3  0x00000000004628b9 in ?? ()
No symbol table info available.
#4  0x00007ff97cdfa182 in start_thread (arg=0x7ff9777fe700) at pthread_create.c:312
        __res = <optimised out>
        pd = 0x7ff9777fe700
        now = <optimised out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140709428455168, -4722585647695982056, 0, 0, 140709428455872, 140709428455168, 4721161781248594456, 4721171953252241944}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimised out>
        pagesize_m1 = <optimised out>
        sp = <optimised out>
        freesize = <optimised out>
        __PRETTY_FUNCTION__ = "start_thread"
#5  0x00007ff97cb2730d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.
.
Thread 5 (Thread 0x7ff977fff700 (LWP 4954)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
No locals.
#1  0x000000000046ced9 in uv_cond_wait ()
No symbol table info available.
#2  0x000000000046d09f in ?? ()
No symbol table info available.
#3  0x00000000004628b9 in ?? ()
No symbol table info available.
#4  0x00007ff97cdfa182 in start_thread (arg=0x7ff977fff700) at pthread_create.c:312
        __res = <optimised out>
        pd = 0x7ff977fff700
        now = <optimised out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140709436847872, -4722585647695982056, 0, 0, 140709436848576, 140709436847872, 4721160681200095768, 4721171953252241944}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimised out>
        pagesize_m1 = <optimised out>
        sp = <optimised out>
        freesize = <optimised out>
        __PRETTY_FUNCTION__ = "start_thread"
#5  0x00007ff97cb2730d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.
.
Thread 4 (Thread 0x7ff976ffd700 (LWP 4956)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
No locals.
#1  0x000000000046ced9 in uv_cond_wait ()
No symbol table info available.
#2  0x000000000046d09f in ?? ()
No symbol table info available.
#3  0x00000000004628b9 in ?? ()
No symbol table info available.
#4  0x00007ff97cdfa182 in start_thread (arg=0x7ff976ffd700) at pthread_create.c:312
        __res = <optimised out>
        pd = 0x7ff976ffd700
        now = <optimised out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140709420062464, -4722585647695982056, 0, 0, 140709420063168, 140709420062464, 4721158483250582040, 4721171953252241944}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimised out>
        pagesize_m1 = <optimised out>
        sp = <optimised out>
        freesize = <optimised out>
        __PRETTY_FUNCTION__ = "start_thread"
#5  0x00007ff97cb2730d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.
.
Thread 3 (Thread 0x7ff9767fc700 (LWP 4957)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
No locals.
#1  0x000000000046ced9 in uv_cond_wait ()
No symbol table info available.
#2  0x000000000046d09f in ?? ()
No symbol table info available.
#3  0x00000000004628b9 in ?? ()
No symbol table info available.
#4  0x00007ff97cdfa182 in start_thread (arg=0x7ff9767fc700) at pthread_create.c:312
        __res = <optimised out>
        pd = 0x7ff9767fc700
        now = <optimised out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140709411669760, -4722585647695982056, 0, 0, 140709411670464, 140709411669760, 4721159583299080728, 4721171953252241944}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimised out>
        pagesize_m1 = <optimised out>
        sp = <optimised out>
        freesize = <optimised out>
        __PRETTY_FUNCTION__ = "start_thread"
#5  0x00007ff97cb2730d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.
.
Thread 2 (Thread 0x7ff97e9ab700 (LWP 4953)):
#0  0x00007ff97caedd7d in nanosleep () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007ff97cb1f334 in usleep (useconds=<optimised out>) at ../sysdeps/unix/sysv/linux/usleep.c:32
        ts = {tv_sec = 0, tv_nsec = 900000}
#2  0x00007ff97e031000 in ?? () from /usr/lib/libv8.so.3.14.5
No symbol table info available.
#3  0x00007ff97e030cc6 in ?? () from /usr/lib/libv8.so.3.14.5
No symbol table info available.
#4  0x00007ff97cdfa182 in start_thread (arg=0x7ff97e9ab700) at pthread_create.c:312
        __res = <optimised out>
        pd = 0x7ff97e9ab700
        now = <optimised out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140709547652864, -4722585647695982056, 0, 0, 140709547653568, 140709547652864, 4721175844582134296, 4721171953252241944}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimised out>
        pagesize_m1 = <optimised out>
        sp = <optimised out>
        freesize = <optimised out>
        __PRETTY_FUNCTION__ = "start_thread"
#5  0x00007ff97cb2730d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.
.
Thread 1 (Thread 0x7ff97e96c780 (LWP 4952)):
#0  0x00007ff97ca62f79 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
        resultvar = 0
        pid = 4952
        selftid = 4952
#1  0x00007ff97ca66388 in __GI_abort () at abort.c:89
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0x7ff97e35f800, sa_sigaction = 0x7ff97e35f800}, sa_mask = {__val = {140735979332847, 140735979330672, 140709545489751, 140733193388037, 0, 14663680, 140709514652968, 30392432, 140735979330672, 0, 140709545518357, 58, 18446744073709551615, 140709518563792, 58, 140735979320384}}, sa_flags = 2123810688, sa_restorer = 0x636f7270202d2064}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x0000000000421d4c in ?? ()
No symbol table info available.
#3  0x00007ff97ddc04fd in ?? () from /usr/lib/libv8.so.3.14.5
No symbol table info available.
#4  0x00007ff97de1d496 in ?? () from /usr/lib/libv8.so.3.14.5
No symbol table info available.
#5  0x00007ff97de1e8b9 in ?? () from /usr/lib/libv8.so.3.14.5
No symbol table info available.
#6  0x00007ff97df65093 in ?? () from /usr/lib/libv8.so.3.14.5
No symbol table info available.
#7  0x000006f900f06362 in ?? ()
No symbol table info available.
#8  0x0000000100000000 in ?? ()
No symbol table info available.
#9  0x000006f900f062c1 in ?? ()
No symbol table info available.
#10 0x00007fffa60e2580 in ?? ()
No symbol table info available.
#11 0x00007fffa60e2618 in ?? ()
No symbol table info available.
#12 0x000006f900f82ac3 in ?? ()
No symbol table info available.
#13 0x0000000000000000 in ?? ()
No symbol table info available.