.
Thread 4 (Thread 0x7fe58d77e680 (LWP 25274)):
#0  0x00007fe590c156f5 in __GI___pthread_timedjoin_ex (threadid=140623897401088, thread_return=thread_return@entry=0x0, abstime=abstime@entry=0x0, block=block@entry=true) at pthread_join_common.c:89
        __tid = 25276
        _buffer = {__routine = 0x7fe590c154f0 <cleanup>, __arg = 0x7fe58d739d28, __canceltype = 0, __prev = 0x0}
        oldtype = 0
        pd = 0x7fe58d739700
        self = <optimized out>
        result = 0
#1  0x00007fe590c154bc in __pthread_join (threadid=<optimized out>, thread_return=thread_return@entry=0x0) at pthread_join.c:24
No locals.
#2  0x00007fe590c8e5bc in isc__taskmgr_destroy (managerp=0x55bcf1b05ff8 <taskmgr>) at ../../../lib/isc/task.c:1583
        manager = 0x7fe58d73f010
        task = <optimized out>
        i = 0
#3  0x00007fe590c8fd3d in isc_taskmgr_destroy (managerp=managerp@entry=0x55bcf1b05ff8 <taskmgr>) at ../../../lib/isc/task.c:2100
No locals.
#4  0x000055bcf1af79d0 in destroy_libs () at ../../../bin/dig/dighost.c:4538
        ptr = <optimized out>
        chase_msg = <optimized out>
        result = <optimized out>
#5  0x000055bcf1aec2df in main (argc=4, argv=0x7ffeeb364458) at ../../../bin/dig/host.c:915
        result = <optimized out>
.
Thread 3 (Thread 0x7fe58cf38700 (LWP 25277)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7fe58d7410a4) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
        __ret = -512
        oldtype = 0
        err = <optimized out>
        oldtype = <optimized out>
        err = <optimized out>
        __ret = <optimized out>
        resultvar = <optimized out>
        __arg4 = <optimized out>
        __arg3 = <optimized out>
        __arg2 = <optimized out>
        __arg1 = <optimized out>
        _a4 = <optimized out>
        _a3 = <optimized out>
        _a2 = <optimized out>
        _a1 = <optimized out>
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x7fe58d741028, cond=0x7fe58d741078) at pthread_cond_wait.c:502
        spin = 0
        buffer = {__routine = 0x7fe590c19f80 <__condvar_cleanup_waiting>, __arg = 0x7fe58cf37dd0, __canceltype = -1921781596, __prev = 0x0}
        cbuffer = {wseq = 5, cond = 0x7fe58d741078, mutex = 0x7fe58d741028, private = 0}
        rt = <optimized out>
        err = <optimized out>
        g = 1
        flags = <optimized out>
        g1_start = <optimized out>
        signals = <optimized out>
        result = 0
        wseq = 5
        seq = 2
        private = <optimized out>
        maxspin = <optimized out>
        err = <optimized out>
        result = <optimized out>
        wseq = <optimized out>
        g = <optimized out>
        seq = <optimized out>
        flags = <optimized out>
        private = <optimized out>
        signals = <optimized out>
        g1_start = <optimized out>
        spin = <optimized out>
        buffer = <optimized out>
        cbuffer = <optimized out>
        rt = <optimized out>
        s = <optimized out>
#2  __pthread_cond_wait (cond=0x7fe58d741078, mutex=mutex@entry=0x7fe58d741028) at pthread_cond_wait.c:655
No locals.
#3  0x00007fe590c93548 in run (uap=0x7fe58d741010) at ../../../lib/isc/timer.c:810
        manager = <optimized out>
        now = {seconds = 1539618512, nanoseconds = 878234000}
        result = <optimized out>
#4  0x00007fe590c14164 in start_thread (arg=<optimized out>) at pthread_create.c:486
        ret = <optimized out>
        pd = <optimized out>
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140623889008384, -7591998463925068293, 140732844622286, 140732844622287, 140732844622432, 140623889006464, 7595554391943241211, 7595580383078342139}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#5  0x00007fe590b3cdef in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
No locals.
.
Thread 2 (Thread 0x7fe58c737700 (LWP 25279)):
#0  0x00007fe590b3d10f in epoll_wait (epfd=5, events=0x7fe58d744010, maxevents=64, timeout=timeout@entry=-1) at ../sysdeps/unix/sysv/linux/epoll_wait.c:30
        resultvar = 18446744073709551612
        sc_cancel_oldtype = 0
        sc_ret = <optimized out>
#1  0x00007fe590ca39dc in watcher (uap=0x7fe58d743010) at ../../../../lib/isc/unix/socket.c:4258
        manager = 0x7fe58d743010
        done = isc_boolean_false
        cc = <optimized out>
        fnname = 0x7fe590cbaf63 "epoll_wait()"
        strbuf = '\000' <repeats 127 times>
#2  0x00007fe590c14164 in start_thread (arg=<optimized out>) at pthread_create.c:486
        ret = <optimized out>
        pd = <optimized out>
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140623880615680, -7591998463925068293, 140732844622110, 140732844622111, 140732844622256, 140623880613760, 7595555490917998075, 7595580383078342139}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#3  0x00007fe590b3cdef in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
No locals.
.
Thread 1 (Thread 0x7fe58d739700 (LWP 25276)):
#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
        set = {__val = {16387, 23, 140623897452360, 128, 140623897397840, 1, 140623897398096, 193, 0, 61783913144387, 140623738901904, 65535, 6860733170392760320, 13366, 0, 0}}
        pid = <optimized out>
        tid = <optimized out>
        ret = <optimized out>
#1  0x00007fe590a44535 in __GI_abort () at abort.c:79
        save_stage = 1
        act = {__sigaction_handler = {sa_handler = 0x0, sa_sigaction = 0x0}, sa_mask = {__val = {0, 0, 0, 0, 0, 0, 0, 0, 140623953324326, 94269997081600, 140623953318264, 0, 17651246113804436480, 0, 140623897432080, 94270026373040}}, sa_flags = -1921719672, sa_restorer = 0xffffffffffffffff}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007fe590c645ef in isc_assertion_failed (file=file@entry=0x7fe590cb769c "../../../lib/isc/timer.c", line=line@entry=392, type=type@entry=isc_assertiontype_require, cond=cond@entry=0x7fe590cb0103 "task != ((void *)0)") at ../../../lib/isc/assertions.c:52
No locals.
#3  0x00007fe590c9245a in isc__timer_create (manager0=0x7fe58d741010, type=<optimized out>, expires=<optimized out>, interval=<optimized out>, task=0x0, action=0x55bcf1af75c0 <connect_timeout>, arg=0x7fe58d74e018, timerp=0x7fe58d74e288) at ../../../lib/isc/timer.c:457
        manager = 0x7fe58d741010
        timer = <optimized out>
        result = <optimized out>
        now = <optimized out>
        _u = <optimized out>
#4  0x000055bcf1aef75a in bringup_timer (query=0x7fe58d74e018, default_timeout=<optimized out>) at ../../../bin/dig/dighost.c:2949
        l = 0x55bcf36f4618
        local_timeout = <optimized out>
        result = <optimized out>
#5  0x000055bcf1af6e22 in send_udp (query=0x7fe58d74e018) at ../../../bin/dig/dighost.c:3135
        l = 0x55bcf36f4618
        result = <optimized out>
        sendbuf = <optimized out>
        next = <optimized out>
#6  0x000055bcf1af76c5 in connect_timeout (task=<optimized out>, event=<optimized out>) at ../../../bin/dig/dighost.c:3265
        l = 0x55bcf36f4618
        query = 0x7fe58d74e018
        cq = <optimized out>
#7  0x00007fe590c8c439 in dispatch (manager=0x7fe58d73f010) at ../../../lib/isc/task.c:1141
        dispatch_count = <optimized out>
        done = isc_boolean_false
        finished = isc_boolean_false
        requeue = isc_boolean_false
        event = 0x7fe58d74cc50
        task = 0x7fe58d740010
        task = <optimized out>
        dispatch_count = <optimized out>
        done = <optimized out>
        requeue = <optimized out>
        finished = <optimized out>
        event = <optimized out>
        was_idle = <optimized out>
#8  run (uap=0x7fe58d73f010) at ../../../lib/isc/task.c:1313
        manager = 0x7fe58d73f010
#9  0x00007fe590c14164 in start_thread (arg=<optimized out>) at pthread_create.c:486
        ret = <optimized out>
        pd = <optimized out>
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140623897401088, -7591998463925068293, 140732844622238, 140732844622239, 140732844622384, 140623897399168, 7595557682425060859, 7595580383078342139}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#10 0x00007fe590b3cdef in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
No locals.