Thread 4 (Thread 0x7f3231f00700 (LWP 14796)):
#0 0x00007f3237b06bb7 in epoll_wait (epfd=5, events=0x7f3238eb1010, maxevents=64, timeout=timeout@entry=-1)
at ../sysdeps/unix/sysv/linux/epoll_wait.c:30
#1 0x00007f323804773b in watcher (uap=0x7f3238eb0010) at ../../../../lib/isc/unix/socket.c:4280
#2 0x00007f3237ddd6db in start_thread (arg=0x7f3231f00700) at pthread_create.c:463
#3 0x00007f3237b0688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
Thread 3 (Thread 0x7f3232701700 (LWP 14794)):
#0 0x00007f3237de39f3 in futex_wait_cancelable (private=<optimised out>, expected=0, futex_word=0x7f3238eae0a4)
at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1 __pthread_cond_wait_common (abstime=0x0, mutex=0x7f3238eae028, cond=0x7f3238eae078) at pthread_cond_wait.c:502
#2 __pthread_cond_wait (cond=0x7f3238eae078, mutex=mutex@entry=0x7f3238eae028) at pthread_cond_wait.c:655
#3 0x00007f3238039370 in run (uap=0x7f3238eae010) at ../../../lib/isc/timer.c:808
#4 0x00007f3237ddd6db in start_thread (arg=0x7f3232701700) at pthread_create.c:463
#5 0x00007f3237b0688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
Thread 2 (Thread 0x7f3232f02700 (LWP 14791)):
#0 0x00007f3237de39f3 in futex_wait_cancelable (private=<optimised out>, expected=0, futex_word=0x7f3238eac0cc)
at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1 __pthread_cond_wait_common (abstime=0x0, mutex=0x7f3238eac028, cond=0x7f3238eac0a0) at pthread_cond_wait.c:502
#2 __pthread_cond_wait (cond=cond@entry=0x7f3238eac0a0, mutex=mutex@entry=0x7f3238eac028) at pthread_cond_wait.c:655
#3 0x00007f32380329e0 in dispatch (manager=0x7f3238eac010) at ../../../lib/isc/task.c:1086
#4 run (uap=0x7f3238eac010) at ../../../lib/isc/task.c:1312
#5 0x00007f3237ddd6db in start_thread (arg=0x7f3232f02700) at pthread_create.c:463
#6 0x00007f3237b0688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
Thread 1 (Thread 0x7f3238eeabc0 (LWP 14607)):
#0 0x00007f3237a24236 in __GI___sigsuspend (set=set@entry=0x7ffd71576aa0) at ../sysdeps/unix/sysv/linux/sigsuspend.c:26
#1 0x00007f323803c4d1 in isc__app_ctxrun (ctx0=ctx0@entry=0x7f32382718e0 <isc_g_appctx>) at ../../../../lib/isc/unix/app.c:721
#2 0x00007f323803c7cc in isc__app_run () at ../../../../lib/isc/unix/app.c:754
#3 0x00007f323803d090 in isc_app_run () at ../../../../lib/isc/unix/../app_api.c:198
#4 0x0000563cebce752a in main (argc=4, argv=0x7ffd71576d08) at ../../../bin/dig/host.c:906
(gdb)
I ran into this myself today after upgrading a machine to bionic..
two copies of it running at once.. both stuck on host.
If I execute a new 'host' command it works, but the existing ones are stuck.l
root 14181 0.0 0.0 4628 868 ? Ss 13:05 0:00 /bin/sh -c cat /run/systemd/ resolve/ stub-resolv. conf | /sbin/resolvconf -a systemd-resolved resolved /etc/resolvconf /update. d /update- libc.d avahi/avahi- daemon- check-dns. sh
root 14292 0.0 0.0 4520 752 ? S 13:05 0:00 run-parts --arg=-a --arg=systemd-
root 14320 0.0 0.0 4520 748 ? S 13:05 0:00 run-parts /etc/resolvconf
root 14354 0.0 0.0 4628 1672 ? S 13:05 0:00 /bin/sh /usr/lib/
root 14607 0.0 0.0 187532 8380 ? Sl 13:05 0:00 host -t soa local.
root 13775 0.0 0.0 4628 868 ? Ss 13:05 0:00 /bin/sh -ec ifup --allow=hotplug eno1; ifup --allow=auto eno1; if ifquery eno1 if-up.d if-up.d if-up.d/ 000resolvconf /update. d /update- libc.d avahi/avahi- daemon- check-dns. sh
>/dev/null; then ifquery --state eno1 >/dev/null; fi
root 13787 0.0 0.0 4592 1868 ? S 13:05 0:00 ifup --allow=auto eno1
root 14179 0.0 0.0 4628 772 ? S 13:05 0:00 /bin/sh -c /bin/run-parts --exit-on-error /etc/network/
root 14182 0.0 0.0 4520 768 ? S 13:05 0:00 /bin/run-parts --exit-on-error /etc/network/
root 14183 0.0 0.0 4628 772 ? S 13:05 0:00 /bin/sh /etc/network/
root 14461 0.0 0.0 4520 752 ? S 13:05 0:00 run-parts --arg=-a --arg=eno1.inet /etc/resolvconf
root 14479 0.0 0.0 4520 728 ? S 13:05 0:00 run-parts /etc/resolvconf
root 14503 0.0 0.0 4628 1612 ? S 13:05 0:00 /bin/sh /usr/lib/
root 14606 0.0 0.0 187532 8384 ? Sl 13:05 0:00 host -t soa local.
(gdb) t a a bt
Thread 4 (Thread 0x7f3231f00700 (LWP 14796)): 0x7f3238eb1010, maxevents=64, timeout= timeout@ entry=- 1) unix/sysv/ linux/epoll_ wait.c: 30 0010) at ../../. ./../lib/ isc/unix/ socket. c:4280 0700) at pthread_ create. c:463 unix/sysv/ linux/x86_ 64/clone. S:95
#0 0x00007f3237b06bb7 in epoll_wait (epfd=5, events=
at ../sysdeps/
#1 0x00007f323804773b in watcher (uap=0x7f3238eb
#2 0x00007f3237ddd6db in start_thread (arg=0x7f3231f0
#3 0x00007f3237b0688f in clone () at ../sysdeps/
Thread 3 (Thread 0x7f3232701700 (LWP 14794)): cancelable (private=<optimised out>, expected=0, futex_word= 0x7f3238eae0a4) unix/sysv/ linux/futex- internal. h:88 cond_wait_ common (abstime=0x0, mutex=0x7f3238e ae028, cond=0x7f3238ea e078) at pthread_ cond_wait. c:502 ae078, mutex=mutex@ entry=0x7f3238e ae028) at pthread_ cond_wait. c:655 e010) at ../../. ./lib/isc/ timer.c: 808 1700) at pthread_ create. c:463 unix/sysv/ linux/x86_ 64/clone. S:95
#0 0x00007f3237de39f3 in futex_wait_
at ../sysdeps/
#1 __pthread_
#2 __pthread_cond_wait (cond=0x7f3238e
#3 0x00007f3238039370 in run (uap=0x7f3238ea
#4 0x00007f3237ddd6db in start_thread (arg=0x7f323270
#5 0x00007f3237b0688f in clone () at ../sysdeps/
Thread 2 (Thread 0x7f3232f02700 (LWP 14791)): cancelable (private=<optimised out>, expected=0, futex_word= 0x7f3238eac0cc) unix/sysv/ linux/futex- internal. h:88 cond_wait_ common (abstime=0x0, mutex=0x7f3238e ac028, cond=0x7f3238ea c0a0) at pthread_ cond_wait. c:502 entry=0x7f3238e ac0a0, mutex=mutex@ entry=0x7f3238e ac028) at pthread_ cond_wait. c:655 0x7f3238eac010) at ../../. ./lib/isc/ task.c: 1086 c010) at ../../. ./lib/isc/ task.c: 1312 2700) at pthread_ create. c:463 unix/sysv/ linux/x86_ 64/clone. S:95
#0 0x00007f3237de39f3 in futex_wait_
at ../sysdeps/
#1 __pthread_
#2 __pthread_cond_wait (cond=cond@
#3 0x00007f32380329e0 in dispatch (manager=
#4 run (uap=0x7f3238ea
#5 0x00007f3237ddd6db in start_thread (arg=0x7f3232f0
#6 0x00007f3237b0688f in clone () at ../sysdeps/
Thread 1 (Thread 0x7f3238eeabc0 (LWP 14607)): entry=0x7ffd715 76aa0) at ../sysdeps/ unix/sysv/ linux/sigsuspen d.c:26 entry=0x7f32382 718e0 <isc_g_appctx>) at ../../. ./../lib/ isc/unix/ app.c:721 ./../lib/ isc/unix/ app.c:754 ./../lib/ isc/unix/ ../app_ api.c:198 6d08) at ../../. ./bin/dig/ host.c: 906
#0 0x00007f3237a24236 in __GI___sigsuspend (set=set@
#1 0x00007f323803c4d1 in isc__app_ctxrun (ctx0=ctx0@
#2 0x00007f323803c7cc in isc__app_run () at ../../.
#3 0x00007f323803d090 in isc_app_run () at ../../.
#4 0x0000563cebce752a in main (argc=4, argv=0x7ffd7157
(gdb)