(lldb) bt all
* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1
  * frame #0: 0x00007fff203b1b3e libc++abi.dylib`__cxa_throw
    frame #1: 0x000000010f98e017 CouchbaseLite`litecore::error::_throw(this=0x000000010441fda0, skipFrames=1) at Error.cc:618:9
    frame #2: 0x000000010f98e185 CouchbaseLite`litecore::error::_throw(domain=LiteCore, code=6) at Error.cc:624:29
    frame #3: 0x000000010ea8be41 CouchbaseLite`litecore::repl::DBAccess::AssertDBOpen(db=0x000061700005a9f0) at DBAccess.hh:46:17
    frame #4: 0x000000010ea90c6f CouchbaseLite`decltype(__f=(0x000061700005a9c8), __args=0x000061700005a9f0)(fleece::Retained<C4Database> const&)>(fp)(std::__1::forward<fleece::Retained<C4Database> const&>(fp0))) std::__1::__invoke<void (*&)(fleece::Retained<C4Database> const&), fleece::Retained<C4Database> const&>(void (*&)(fleece::Retained<C4Database> const&), fleece::Retained<C4Database> const&) at type_traits:3694:1
    frame #5: 0x000000010ea90be2 CouchbaseLite`void std::__1::__invoke_void_return_wrapper<void, true>::__call<void (__args=(0x000061700005a9c8), __args=0x000061700005a9f0)(fleece::Retained<C4Database> const&), fleece::Retained<C4Database> const&>(void (*&)(fleece::Retained<C4Database> const&), fleece::Retained<C4Database> const&) at __functional_base:348:9
    frame #6: 0x000000010ea90ba2 CouchbaseLite`std::__1::__function::__alloc_func<void (*)(fleece::Retained<C4Database> const&), std::__1::allocator<void (*)(fleece::Retained<C4Database> const&)>, void (fleece::Retained<C4Database> const&)>::operator(this=0x000061700005a9c8, __arg=0x000061700005a9f0)(fleece::Retained<C4Database> const&) at functional:1558:16
    frame #7: 0x000000010ea8d3f1 CouchbaseLite`std::__1::__function::__func<void (*)(fleece::Retained<C4Database> const&), std::__1::allocator<void (*)(fleece::Retained<C4Database> const&)>, void (fleece::Retained<C4Database> const&)>::operator(this=0x000061700005a9c0, __arg=0x000061700005a9f0)(fleece::Retained<C4Database> const&) at functional:1732:12
    frame #8: 0x000000010ee37c08 CouchbaseLite`std::__1::__function::__value_func<void (fleece::Retained<C4Database> const&)>::operator(this=0x000061700005a9c0, __args=0x000061700005a9f0)(fleece::Retained<C4Database> const&) const at functional:1885:16
    frame #9: 0x000000010ee3794d CouchbaseLite`std::__1::function<void (fleece::Retained<C4Database> const&)>::operator(this= Function = litecore::repl::DBAccess::AssertDBOpen(fleece::Retained<C4Database> const&) , __arg=0x000061700005a9f0)(fleece::Retained<C4Database> const&) const at functional:2560:12
    frame #10: 0x000000010ee3789c CouchbaseLite`litecore::access_lock<fleece::Retained<C4Database>, std::__1::recursive_mutex>::access<fleece::Retained<C4Database>&>::access(this=0x000000010454e280, mut=0x000061700005a9f8, ref=0x000061700005a9f0, sentry= Function = litecore::repl::DBAccess::AssertDBOpen(fleece::Retained<C4Database> const&) )>&) at access_lock.hh:109:29
    frame #11: 0x000000010ee28c91 CouchbaseLite`litecore::access_lock<fleece::Retained<C4Database>, std::__1::recursive_mutex>::useLocked(this=0x000061700005a9c0) at access_lock.hh:152:20
    frame #12: 0x000000010ee2b6f5 CouchbaseLite`litecore::repl::Replicator::isDocumentPending(this=0x000061900009a680, docID=litecore::repl::Worker::slice @ 0x000000010454e230) at Replicator.cc:680:52
    frame #13: 0x000000010ed408e2 CouchbaseLite`litecore::C4ReplicatorImpl::PendingDocuments::isDocumentPending(this=0x0000000104694a40, docID=(buf = 0x000000010e37cc03, size = 5)) at c4ReplicatorImpl.hh:533:47
    frame #14: 0x000000010ed0569b CouchbaseLite`litecore::C4ReplicatorImpl::isDocumentPending(this=0x0000613000075600, docID=(buf = 0x000000010e37cc03, size = 5)) const at c4ReplicatorImpl.hh:193:43
    frame #15: 0x000000010ed05391 CouchbaseLite`C4Replicator::isDocumentPending(this=0x0000613000075600, docID=C4Base::slice @ 0x000000010441efa0) const at c4Replicator.cc:94:30
    frame #16: 0x000000010ebfa3b7 CouchbaseLite`::c4repl_isDocumentPending(repl=0x0000613000075600, docID=(buf = 0x000000010e37cc03, size = 5), outErr=0x00000001046932a0) at c4Replicator_CAPI.cc:159:22
    frame #17: 0x000000010e5ea13d CouchbaseLite`-[CBLReplicator isDocumentPending:error:](self=0x0000610000040c40, _cmd="isDocumentPending:error:", documentID="doc-1", error=0x00000001046e2060) at CBLReplicator.mm:461:22
    frame #18: 0x000000010e1aa2db CouchbaseLiteTests`__67-[ReplicatorTest_PendingDocIds testIsDocumentPendingWithPushFilter]_block_invoke_2(.block_descriptor=0x00006040000ec910, change=0x00006030000880f0) at ReplicatorTest+PendingDocIds.m:397:24
    frame #19: 0x000000010e5353ad CouchbaseLite`__37-[CBLChangeListenerToken postChange:]_block_invoke(.block_descriptor=0x00006040000e4cd0) at CBLChangeListenerToken.m:44:9
    frame #20: 0x00000001001735fb libclang_rt.asan_osx_dynamic.dylib`__wrap_dispatch_async_block_invoke + 203
    frame #21: 0x00007fff20241623 libdispatch.dylib`_dispatch_call_block_and_release + 12
    frame #22: 0x00007fff20242806 libdispatch.dylib`_dispatch_client_callout + 8
    frame #23: 0x00007fff2024eb4f libdispatch.dylib`_dispatch_main_queue_callback_4CF + 940
    frame #24: 0x00007fff20520f18 CoreFoundation`__CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9
    frame #25: 0x00007fff204e3112 CoreFoundation`__CFRunLoopRun + 2755
    frame #26: 0x00007fff204e1f8c CoreFoundation`CFRunLoopRunSpecific + 563
    frame #27: 0x0000000100e37a70 XCTestCore`-[XCTWaiter waitForExpectations:timeout:enforceOrder:] + 832
    frame #28: 0x0000000100ddc190 XCTestCore`-[XCTestCase(AsynchronousTesting) waitForExpectations:timeout:enforceOrder:] + 102
    frame #29: 0x000000010e1a98e2 CouchbaseLiteTests`-[ReplicatorTest_PendingDocIds testIsDocumentPendingWithPushFilter](self=0x0000612000051040, _cmd="testIsDocumentPendingWithPushFilter") at ReplicatorTest+PendingDocIds.m:415:5
    frame #30: 0x00007fff204c76fc CoreFoundation`__invoking___ + 140
    frame #31: 0x00007fff204c759d CoreFoundation`-[NSInvocation invoke] + 305
    frame #32: 0x0000000100e90488 XCTestCore`+[XCTFailableInvocation invokeStandardConventionInvocation:completion:] + 64
    frame #33: 0x0000000100e90446 XCTestCore`__65+[XCTFailableInvocation invokeInvocation:lastObservedErrorIssue:]_block_invoke_3 + 23
    frame #34: 0x0000000100e8fe32 XCTestCore`__81+[XCTFailableInvocation invokeWithAsynchronousWait:lastObservedErrorIssue:block:]_block_invoke.11 + 71
    frame #35: 0x0000000100e0b632 XCTestCore`+[XCTSwiftErrorObservation observeErrorsInBlock:] + 113
    frame #36: 0x0000000100e8fcc7 XCTestCore`+[XCTFailableInvocation invokeWithAsynchronousWait:lastObservedErrorIssue:block:] + 435
    frame #37: 0x0000000100e9015a XCTestCore`+[XCTFailableInvocation invokeInvocation:lastObservedErrorIssue:] + 237
    frame #38: 0x0000000100e76788 XCTestCore`__24-[XCTestCase invokeTest]_block_invoke_2 + 99
    frame #39: 0x0000000100e1ae03 XCTestCore`-[XCTMemoryChecker _assertInvalidObjectsDeallocatedAfterScope:] + 65
    frame #40: 0x0000000100e80e1d XCTestCore`-[XCTestCase assertInvalidObjectsDeallocatedAfterScope:] + 61
    frame #41: 0x0000000100e766ec XCTestCore`__24-[XCTestCase invokeTest]_block_invoke.272 + 165
    frame #42: 0x0000000100de68b4 XCTestCore`-[XCTestCase(XCTIssueHandling) _caughtUnhandledDeveloperExceptionPermittingControlFlowInterruptions:caughtInterruptionException:whileExecutingBlock:] + 179
    frame #43: 0x0000000100e76244 XCTestCore`-[XCTestCase invokeTest] + 812
    frame #44: 0x0000000100e77b52 XCTestCore`__26-[XCTestCase performTest:]_block_invoke_2 + 43
    frame #45: 0x0000000100de68b4 XCTestCore`-[XCTestCase(XCTIssueHandling) _caughtUnhandledDeveloperExceptionPermittingControlFlowInterruptions:caughtInterruptionException:whileExecutingBlock:] + 179
    frame #46: 0x0000000100e77a89 XCTestCore`__26-[XCTestCase performTest:]_block_invoke.375 + 86
    frame #47: 0x0000000100e3064c XCTestCore`+[XCTContext runInContextForTestCase:markAsReportingBase:block:] + 220
    frame #48: 0x0000000100e77299 XCTestCore`-[XCTestCase performTest:] + 693
    frame #49: 0x0000000100db27a2 XCTestCore`-[XCTest runTest] + 57
    frame #50: 0x0000000100e33829 XCTestCore`-[XCTestSuite runTestBasedOnRepetitionPolicy:testRun:] + 156
    frame #51: 0x0000000100e3369f XCTestCore`__27-[XCTestSuite performTest:]_block_invoke + 252
    frame #52: 0x0000000100e32fd5 XCTestCore`__59-[XCTestSuite _performProtectedSectionForTest:testSection:]_block_invoke + 24
    frame #53: 0x0000000100e3064c XCTestCore`+[XCTContext runInContextForTestCase:markAsReportingBase:block:] + 220
    frame #54: 0x0000000100e32f8c XCTestCore`-[XCTestSuite _performProtectedSectionForTest:testSection:] + 159
    frame #55: 0x0000000100e3324a XCTestCore`-[XCTestSuite performTest:] + 222
    frame #56: 0x0000000100db27a2 XCTestCore`-[XCTest runTest] + 57
    frame #57: 0x0000000100e33829 XCTestCore`-[XCTestSuite runTestBasedOnRepetitionPolicy:testRun:] + 156
    frame #58: 0x0000000100e3369f XCTestCore`__27-[XCTestSuite performTest:]_block_invoke + 252
    frame #59: 0x0000000100e32fd5 XCTestCore`__59-[XCTestSuite _performProtectedSectionForTest:testSection:]_block_invoke + 24
    frame #60: 0x0000000100e3064c XCTestCore`+[XCTContext runInContextForTestCase:markAsReportingBase:block:] + 220
    frame #61: 0x0000000100e32f8c XCTestCore`-[XCTestSuite _performProtectedSectionForTest:testSection:] + 159
    frame #62: 0x0000000100e3324a XCTestCore`-[XCTestSuite performTest:] + 222
    frame #63: 0x0000000100db27a2 XCTestCore`-[XCTest runTest] + 57
    frame #64: 0x0000000100e33829 XCTestCore`-[XCTestSuite runTestBasedOnRepetitionPolicy:testRun:] + 156
    frame #65: 0x0000000100e3369f XCTestCore`__27-[XCTestSuite performTest:]_block_invoke + 252
    frame #66: 0x0000000100e32fd5 XCTestCore`__59-[XCTestSuite _performProtectedSectionForTest:testSection:]_block_invoke + 24
    frame #67: 0x0000000100e3064c XCTestCore`+[XCTContext runInContextForTestCase:markAsReportingBase:block:] + 220
    frame #68: 0x0000000100e32f8c XCTestCore`-[XCTestSuite _performProtectedSectionForTest:testSection:] + 159
    frame #69: 0x0000000100e3324a XCTestCore`-[XCTestSuite performTest:] + 222
    frame #70: 0x0000000100db27a2 XCTestCore`-[XCTest runTest] + 57
    frame #71: 0x0000000100db46a7 XCTestCore`__44-[XCTTestRunSession runTestsAndReturnError:]_block_invoke_2 + 148
    frame #72: 0x0000000100e3064c XCTestCore`+[XCTContext runInContextForTestCase:markAsReportingBase:block:] + 220
    frame #73: 0x0000000100db460c XCTestCore`__44-[XCTTestRunSession runTestsAndReturnError:]_block_invoke + 119
    frame #74: 0x0000000100db478d XCTestCore`__44-[XCTTestRunSession runTestsAndReturnError:]_block_invoke.85 + 96
    frame #75: 0x0000000100ddee7f XCTestCore`-[XCTestObservationCenter _observeTestExecutionForBlock:] + 325
    frame #76: 0x0000000100db437e XCTestCore`-[XCTTestRunSession runTestsAndReturnError:] + 473
    frame #77: 0x0000000100e2dc67 XCTestCore`-[XCTestDriver _runTests] + 466
    frame #78: 0x0000000100db2d36 XCTestCore`_XCTestMain + 108
    frame #79: 0x0000000100006480 xctest`main + 423
    frame #80: 0x00007fff20407f3d libdyld.dylib`start + 1
    frame #81: 0x00007fff20407f3d libdyld.dylib`start + 1
  thread #2
    frame #0: 0x00007fff203b895e libsystem_kernel.dylib`__workq_kernreturn + 10
    frame #1: 0x00007fff203e94c1 libsystem_pthread.dylib`_pthread_wqthread + 414
    frame #2: 0x00007fff203e842f libsystem_pthread.dylib`start_wqthread + 15
  thread #3
    frame #0: 0x00007fff203b895e libsystem_kernel.dylib`__workq_kernreturn + 10
    frame #1: 0x00007fff203e94c1 libsystem_pthread.dylib`_pthread_wqthread + 414
    frame #2: 0x00007fff203e842f libsystem_pthread.dylib`start_wqthread + 15
  thread #4
    frame #0: 0x00007fff203b895e libsystem_kernel.dylib`__workq_kernreturn + 10
    frame #1: 0x00007fff203e94c1 libsystem_pthread.dylib`_pthread_wqthread + 414
    frame #2: 0x00007fff203e842f libsystem_pthread.dylib`start_wqthread + 15
  thread #5
    frame #0: 0x00007fff203b895e libsystem_kernel.dylib`__workq_kernreturn + 10
    frame #1: 0x00007fff203e94c1 libsystem_pthread.dylib`_pthread_wqthread + 414
    frame #2: 0x00007fff203e842f libsystem_pthread.dylib`start_wqthread + 15
  thread #6
    frame #0: 0x00007fff203b895e libsystem_kernel.dylib`__workq_kernreturn + 10
    frame #1: 0x00007fff203e94c1 libsystem_pthread.dylib`_pthread_wqthread + 414
    frame #2: 0x00007fff203e842f libsystem_pthread.dylib`start_wqthread + 15
  thread #7
    frame #0: 0x00007fff203e8420 libsystem_pthread.dylib`start_wqthread
  thread #8, name = 'Timer (CBL)'
    frame #0: 0x00007fff203b9cde libsystem_kernel.dylib`__psynch_cvwait + 10
    frame #1: 0x00007fff203ece49 libsystem_pthread.dylib`_pthread_cond_wait + 1298
    frame #2: 0x00007fff20355e03 libc++.1.dylib`std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
    frame #3: 0x000000010eda72dd CouchbaseLite`std::__1::cv_status std::__1::condition_variable::wait_for<long long, std::__1::ratio<1l, 1000000000l> >(this=0x000060d000018018, __lk=0x0000000112ff7020, __d=0x0000000112f77c40) at __mutex_base:465:9
    frame #4: 0x000000010eda65bc CouchbaseLite`void std::__1::condition_variable::__do_timed_wait<std::__1::chrono::steady_clock>(this=0x000060d000018018, __lk=0x0000000112ff7020, __tp=time_point<std::chrono::steady_clock, std::chrono::duration<long long, std::ratio<1, 1000000000> > > @ 0x0000000112f77c20) at __mutex_base:520:5
    frame #5: 0x000000010ed9fe33 CouchbaseLite`std::__1::cv_status std::__1::condition_variable::wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >(this=0x000060d000018018, __lk=0x0000000112ff7020, __t=0x0000000112ff70a0) at __mutex_base:423:5
    frame #6: 0x000000010ed9ef90 CouchbaseLite`litecore::actor::Timer::Manager::run(this=0x000060d000017fc0) at Timer.cc:62:28
    frame #7: 0x000000010eda41f5 CouchbaseLite`litecore::actor::Timer::Manager::Manager(this=0x000060200001a558)::$_0::operator()() const at Timer.cc:28:24
    frame #8: 0x000000010eda416d CouchbaseLite`decltype(__f=0x000060200001a558)::$_0>(fp)()) std::__1::__invoke<litecore::actor::Timer::Manager::Manager()::$_0>(litecore::actor::Timer::Manager::Manager()::$_0&&) at type_traits:3694:1
    frame #9: 0x000000010eda3f15 CouchbaseLite`void std::__1::__thread_execute<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, litecore::actor::Timer::Manager::Manager()::$_0>(__t=size=2, (null)=__tuple_indices<> @ 0x00007000100c3f08)::$_0>&, std::__1::__tuple_indices<>) at thread:286:5
    frame #10: 0x000000010eda2e03 CouchbaseLite`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, litecore::actor::Timer::Manager::Manager()::$_0> >(__vp=0x000060200001a550) at thread:297:5
    frame #11: 0x00007fff203ec8fc libsystem_pthread.dylib`_pthread_start + 224
    frame #12: 0x00007fff203e8443 libsystem_pthread.dylib`thread_start + 15
(lldb)