holochain deadlock

★ ERROR 2019-11-04 09:42:20 [holochain_core_types::sync] hc_guard_watcher/puid-0-0 crates/core_types/src/sync.rs:121 
★ 
★         !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
★         !!! IMMORTAL LOCK GUARD FOUND !!!
★         !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
★ 
★ Lock guard puid-0-a2 lived for > 60 seconds.
★ Backtrace at the moment of guard creation follows:
★ 
★ stack backtrace:
★    0: holochain_core_types::sync::HcMutex<T>::lock::h4c7cd120a10a7ce9 (0x5563c012f77e)
★    1: holochain_conductor_lib::conductor::base::Conductor::shutdown::hb4c28a68aab3ba9d (0x5563c02478f4)
★    2: <holochain_conductor_lib::conductor::base::Conductor as core::ops::drop::Drop>::drop::hcf534c6b131cfaaa (0x5563c0246e14)
★    3: core::ptr::real_drop_in_place::hec83553513f9cf62 (0x5563c0d903f4)
★    4: holochain::main::ha8307f3299ca87e9 (0x5563c0d8dfcf)
★    5: std::rt::lang_start::{{closure}}::h83b70ac87ab49379 (0x5563c0d937b3)
★    6: main (0x5563c0d8501e)
★    7: __libc_start_main (0x7f2453b37b8e)
★    8: _start (0x5563bff382aa)
★    9: <unknown> (0x0)
★ DEBUG 2019-11-04 09:42:20 [holochain_core_types::sync] hc_guard_watcher/puid-0-0 crates/core_types/src/sync.rs:166 tracking 2 active guard(s) alive for > 500ms:
★ KIND       PUID      ELAPSED (ms)
★ Lock   puid-0-a2        61313 [!!!]
★ Read   puid-88-1        59291
★ DEBUG 2019-11-04 09:42:21 [holochain_core_types::sync] hc_guard_watcher/puid-0-0 crates/core_types/src/sync.rs:166 tracking 2 active guard(s) alive for > 500ms:
★ KIND       PUID      ELAPSED (ms)
★ Lock   puid-0-a2        62318 [!!!]
★ Read   puid-88-1        60296
★ ERROR 2019-11-04 09:42:22 [holochain_core_types::sync] hc_guard_watcher/puid-0-0 crates/core_types/src/sync.rs:121 
★ 
★         !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
★         !!! IMMORTAL LOCK GUARD FOUND !!!
★         !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
★ 
★ Read guard puid-88-1 lived for > 60 seconds.
★ Backtrace at the moment of guard creation follows:
★ 
★ stack backtrace:
★    0: holochain_core_types::sync::HcRwLock<T>::try_read::h37547f248888c41d (0x5563c04342bf)
★    1: holochain_core_types::sync::HcRwLock<T>::read::he25f2b00e10c781e (0x5563c043381b)
★    2: holochain_core::scheduled_jobs::pending_validations::run_pending_validations::h47044f2cc094cef9 (0x5563c046c5d4)
★    3: std::sys_common::backtrace::__rust_begin_short_backtrace::hb7557bf5aa10b2a1 (0x5563c050a49e)
★    4: core::ops::function::FnOnce::call_once{{vtable.shim}}::hdfb71d378108d0ab (0x5563c050af6b)
★    5: <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::h56322f6b657cd33d (0x5563c0d39d1f)
★    6: std::sys::unix::thread::Thread::new::thread_start::h588aedefb535eac7 (0x5563c0d3b77c)
★    7: start_thread (0x7f2453ee8ef7)
★    8: __GI___clone (0x7f2453c0822f)
★    9: <unknown> (0x0)