Assertion failure in dns_resolver_attach() at resolver.c:10599

Job #3359953 failed for 5a4ea123.

resolver.c:10599: REQUIRE(!__extension__ ({ __auto_type __atomic_load_ptr = ((&source->exiting)); __typeof__ ((void)0, *__atomic_load_ptr) __atomic_load_tmp; __atomic_load (__atomic_load_ptr, &__atomic_load_tmp, (memory_order_acquire)); __atomic_load_tmp; })) failed

I:shutdown:Core dump(s) found: /builds/isc-projects/bind9/bin/tests/system/shutdown/resolver/core.6454 
D:shutdown:backtrace from /builds/isc-projects/bind9/bin/tests/system/shutdown/resolver/core.6454:
D:shutdown:--------------------------------------------------------------------------------
D:/builds/isc-projects/bind9/bin/tests/system/shutdown:Core was generated by `/builds/isc-projects/bind9/bin/named/.libs/lt-named -c /builds/isc-projects/bin'.
D:/builds/isc-projects/bind9/bin/tests/system/shutdown:Program terminated with signal SIGABRT, Aborted.
D:/builds/isc-projects/bind9/bin/tests/system/shutdown:#0  __restore_sigs (set=set@entry=0x7f4f2a0c0eb0) at ./arch/x86_64/syscall_arch.h:40
D:/builds/isc-projects/bind9/bin/tests/system/shutdown:[Current thread is 1 (LWP 6525)]
D:/builds/isc-projects/bind9/bin/tests/system/shutdown:#0  __restore_sigs (set=set@entry=0x7f4f2a0c0eb0) at ./arch/x86_64/syscall_arch.h:40
D:/builds/isc-projects/bind9/bin/tests/system/shutdown:#1  0x00007f4f2d3ca382 in raise (sig=sig@entry=6) at src/signal/raise.c:11
D:/builds/isc-projects/bind9/bin/tests/system/shutdown:#2  0x00007f4f2d39dec5 in abort () at src/exit/abort.c:11
D:/builds/isc-projects/bind9/bin/tests/system/shutdown:#3  0x00005613ffb84eb8 in assertion_failed (file=<optimized out>, line=<optimized out>, type=<optimized out>, cond=0x7f4f2cda1b90 "!__extension__ ({ __auto_type __atomic_load_ptr = ((&source->exiting)); __typeof__ ((void)0, *__atomic_load_ptr) __atomic_load_tmp; __atomic_load (__atomic_load_ptr, &__atomic_load_tmp, (memory_order_"...) at main.c:239
D:/builds/isc-projects/bind9/bin/tests/system/shutdown:#4  0x00007f4f2ce23ae5 in isc_assertion_failed (file=file@entry=0x7f4f2cda2586 "resolver.c", line=line@entry=10599, type=type@entry=isc_assertiontype_require, cond=cond@entry=0x7f4f2cda1b90 "!__extension__ ({ __auto_type __atomic_load_ptr = ((&source->exiting)); __typeof__ ((void)0, *__atomic_load_ptr) __atomic_load_tmp; __atomic_load (__atomic_load_ptr, &__atomic_load_tmp, (memory_order_"...) at assertions.c:48
D:/builds/isc-projects/bind9/bin/tests/system/shutdown:#5  0x00007f4f2cce5529 in dns_resolver_attach (source=source@entry=0x7f4f2923a100, targetp=targetp@entry=0x7f4f2821d008) at resolver.c:10599
D:/builds/isc-projects/bind9/bin/tests/system/shutdown:#6  0x00007f4f2cce76ed in fctx_create (res=res@entry=0x7f4f2923a100, task=task@entry=0x7f4f28958d80, name=name@entry=0x7f4f2621a008, type=type@entry=28, domain=domain@entry=0x7f4f2a0c1f50, nameservers=nameservers@entry=0x7f4f2a0c1ee0, client=<optimized out>, options=<optimized out>, bucketnum=<optimized out>, depth=<optimized out>, qc=<optimized out>, fctxp=<optimized out>) at resolver.c:4778
D:/builds/isc-projects/bind9/bin/tests/system/shutdown:#7  0x00007f4f2ccebca6 in dns_resolver_createfetch (res=<optimized out>, name=name@entry=0x7f4f2621a008, type=type@entry=28, domain=domain@entry=0x7f4f2a0c1f50, nameservers=nameservers@entry=0x7f4f2a0c1ee0, forwarders=forwarders@entry=0x0, client=<optimized out>, id=<optimized out>, options=<optimized out>, depth=<optimized out>, qc=<optimized out>, task=<optimized out>, action=<optimized out>, arg=<optimized out>, rdataset=<optimized out>, sigrdataset=<optimized out>, fetchp=<optimized out>) at resolver.c:10927
D:/builds/isc-projects/bind9/bin/tests/system/shutdown:#8  0x00007f4f2cbf4213 in fetch_name (adbname=adbname@entry=0x7f4f2621a000, start_at_zone=start_at_zone@entry=true, depth=depth@entry=1, qc=qc@entry=0x7f4f28b26580, type=type@entry=28) at adb.c:4077
D:/builds/isc-projects/bind9/bin/tests/system/shutdown:#9  0x00007f4f2cbfc32e in dns_adb_createfind (adb=<optimized out>, task=0x7f4f28955cc0, action=action@entry=0x7f4f2cceda27 <fctx_finddone>, arg=arg@entry=0x7f4f28b1f800, name=name@entry=0x7f4f2a0c2c50, qname=0x7f4f28b1f810, qtype=<optimized out>, options=<optimized out>, now=<optimized out>, target=<optimized out>, port=<optimized out>, depth=<optimized out>, qc=<optimized out>, findp=<optimized out>) at adb.c:3148
D:/builds/isc-projects/bind9/bin/tests/system/shutdown:#10 0x00007f4f2ccea738 in findname (fctx=fctx@entry=0x7f4f28b1f800, name=name@entry=0x7f4f2a0c2c50, port=port@entry=0, options=<optimized out>, options@entry=15, flags=flags@entry=0, now=<optimized out>, overquota=<optimized out>, need_alternate=<optimized out>, no_addresses=<optimized out>) at resolver.c:3410
D:/builds/isc-projects/bind9/bin/tests/system/shutdown:#11 0x00007f4f2ccecd14 in fctx_getaddresses (badcache=<optimized out>, fctx=0x7f4f28b1f800) at resolver.c:3747
D:/builds/isc-projects/bind9/bin/tests/system/shutdown:#12 fctx_try (fctx=<optimized out>, fctx@entry=0x7f4f28b1f800, retrying=retrying@entry=true, badcache=badcache@entry=false) at resolver.c:4144
D:/builds/isc-projects/bind9/bin/tests/system/shutdown:#13 0x00007f4f2ccf4c48 in resume_qmin (task=<optimized out>, event=<optimized out>) at resolver.c:4390
D:/builds/isc-projects/bind9/bin/tests/system/shutdown:#14 0x00007f4f2ce44071 in task_run (task=0x7f4f28955cc0) at task.c:815
D:/builds/isc-projects/bind9/bin/tests/system/shutdown:#15 isc_task_run (task=0x7f4f28955cc0) at task.c:896
D:/builds/isc-projects/bind9/bin/tests/system/shutdown:#16 0x00007f4f2ce08be5 in isc__nm_async_task (worker=worker@entry=0x7f4f2ba39cc0, ev0=ev0@entry=0x7f4f2b44a980) at netmgr/netmgr.c:848
D:/builds/isc-projects/bind9/bin/tests/system/shutdown:#17 0x00007f4f2ce1082d in process_netievent (worker=worker@entry=0x7f4f2ba39cc0, ievent=0x7f4f2b44a980) at netmgr/netmgr.c:920
D:/builds/isc-projects/bind9/bin/tests/system/shutdown:#18 0x00007f4f2ce1121b in process_queue (worker=worker@entry=0x7f4f2ba39cc0, type=type@entry=NETIEVENT_TASK) at netmgr/netmgr.c:1013
D:/builds/isc-projects/bind9/bin/tests/system/shutdown:#19 0x00007f4f2ce11cd2 in process_all_queues (worker=0x7f4f2ba39cc0) at netmgr/netmgr.c:767
D:/builds/isc-projects/bind9/bin/tests/system/shutdown:#20 async_cb (handle=0x7f4f2ba3a020) at netmgr/netmgr.c:796
D:/builds/isc-projects/bind9/bin/tests/system/shutdown:#21 0x00007f4f2c707b4a in ?? () from /usr/lib/libuv.so.1
D:/builds/isc-projects/bind9/bin/tests/system/shutdown:#22 0x00007f4f2c7174c9 in uv.io_poll () from /usr/lib/libuv.so.1
D:/builds/isc-projects/bind9/bin/tests/system/shutdown:#23 0x00007f4f2c70818b in uv_run () from /usr/lib/libuv.so.1
D:/builds/isc-projects/bind9/bin/tests/system/shutdown:#24 0x00007f4f2ce114ea in nm_thread (worker0=0x7f4f2ba39cc0) at netmgr/netmgr.c:698
D:/builds/isc-projects/bind9/bin/tests/system/shutdown:#25 0x00007f4f2ce4d044 in isc__trampoline_run (arg=0x7f4f2b5f27c0) at trampoline.c:189
D:/builds/isc-projects/bind9/bin/tests/system/shutdown:#26 0x00007f4f2d3d708b in start (p=0x7f4f2a0c6f48) at src/thread/pthread_create.c:203
D:/builds/isc-projects/bind9/bin/tests/system/shutdown:#27 0x00007f4f2d3d938e in __clone () at src/thread/x86_64/clone.s:22
D:/builds/isc-projects/bind9/bin/tests/system/shutdown:Backtrace stopped: frame did not save the PC

Artifacts were saved as part of the CI job.