Here's the stack:

#0 0x7f21062c7c1c base::debug::StackTrace::StackTrace()
#1 0x7f21062ee1ec logging::LogMessage::~LogMessage()
#2 0x7f2106372f09 base::internal::AssertBaseSyncPrimitivesAllowed()
#3 0x7f2106346a36 base::ConditionVariable::Wait()
#4 0x7f21024303d8 leveldb::DBImpl::~DBImpl()
#5 0x7f210243071e leveldb::DBImpl::~DBImpl()
#6 0x7f210242e05a leveldb_env::DBTracker::TrackedDBImpl::~TrackedDBImpl()
#7 0x5583fefa6ce3 sync_file_system::drive_backend::MetadataDatabase::~MetadataDatabase()
#8 0x5583fefc8ff9 sync_file_system::drive_backend::SyncEngineInitializer::~SyncEngineInitializer()
#9 0x5583fefc902e sync_file_system::drive_backend::SyncEngineInitializer::~SyncEngineInitializer()
#10 0x5583fefcc66e sync_file_system::drive_backend::SyncTaskManager::NotifyTaskDoneBody()
#11 0x5583fefcb8d5 sync_file_system::drive_backend::SyncTaskManager::NotifyTaskDone()
#12 0x5583fefc9585 sync_file_system::drive_backend::SyncEngineInitializer::DidGetAboutResource()
#13 0x5583fefcae2d _ZN4base8internal13FunctorTraitsIMN16sync_file_system13drive_backend21SyncEngineInitializerEFvNSt3__110unique_ptrINS3_13SyncTaskTokenENS5_14defa\
ult_deleteIS7_EEEEN11google_apis17DriveApiErrorCodeENS6_INSB_13AboutResourceENS8_ISD_EEEEEvE6InvokeIRKNS_7WeakPtrIS4_EEJSA_SC_SF_EEEvSH_OT_DpOT0_
#14 0x5583fefcad2d _ZN4base8internal7InvokerINS0_9BindStateIMN16sync_file_system13drive_backend21SyncEngineInitializerEFvNSt3__110unique_ptrINS4_13SyncTaskTokenENS\
6_14default_deleteIS8_EEEEN11google_apis17DriveApiErrorCodeENS7_INSC_13AboutResourceENS9_ISE_EEEEEJNS_7WeakPtrIS5_EENS0_13PassedWrapperISB_EEEEEFvSD_SG_EE3RunEPNS0\
_13BindStateBaseEOSD_OSG_
#15 0x5583fd0b7d9a _ZNO4base17RepeatingCallbackIFvNS_4File5ErrorERKNS1_4InfoEEE3RunES2_S5_
#16 0x5583fef9ca9e _ZN4base8internal13FunctorTraitsINS_17RepeatingCallbackIFvN11google_apis17DriveApiErrorCodeENSt3__110unique_ptrINS3_13AboutResourceENS5_14defaul\
t_deleteIS7_EEEEEEEvE6InvokeISC_JS4_SA_EEEvOT_DpOT0_
#17 0x5583fef9c9e1 _ZN4base8internal7InvokerINS0_9BindStateINS_17RepeatingCallbackIFvN11google_apis17DriveApiErrorCodeENSt3__110unique_ptrINS4_13AboutResourceENS6_\
14default_deleteIS8_EEEEEEEJS5_NS0_13PassedWrapperISB_EEEEEFvvEE7RunOnceEPNS0_13BindStateBaseE
#18 0x7f21062c84f5 base::debug::TaskAnnotator::RunTask()
#19 0x7f210635d4b3 base::internal::TaskTracker::RunOrSkipTask()
#20 0x7f210635e082 base::internal::TaskTrackerPosix::RunOrSkipTask()
#21 0x7f210635c694 base::internal::TaskTracker::RunNextTask()
#22 0x7f21063550b6 base::internal::SchedulerWorker::Thread::ThreadMain()
#23 0x7f2106367d5f base::(anonymous namespace)::ThreadFunc()
#24 0x7f2106444184 start_thread
#25 0x7f20fa239ffd clone

I can readily repro this by building chromeos, enabling dev mode extensions, and going into 'load unpacked extension.'