acelyc111 commented on issue #1963:
URL:
https://github.com/apache/incubator-pegasus/issues/1963#issuecomment-2020426871
Piece of the back trace:
```
Thread 273 (Thread 0x7f3df4dbc700 (LWP 25825)):
#0 0x00007f3e0f2bbb3b in do_futex_wait.constprop.1 () from
/lib64/libpthread.so.0
#1 0x00007f3e0f2bbbcf in __new_sem_wait_slow.constprop.0 () from
/lib64/libpthread.so.0
#2 0x00007f3e0f2bbc6b in sem_wait@@GLIBC_2.2.5 () from
/lib64/libpthread.so.0
#3 0x00007f3e1192a6e2 in dsn::task::wait(int) () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#4 0x00007f3e1193e44f in dsn::task_tracker::wait_outstanding_tasks() ()
from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#5 0x00007f3e1179eef6 in ?? () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#6 0x00007f3e117a0e1a in
dsn::replication::replica_app_info::store(std::string const&) () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#7 0x00007f3e116fbdd4 in
dsn::replication::replica::store_app_info(dsn::app_info&, std::string const&)
() from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#8 0x00007f3e1173b18d in dsn::replication::replica::initialize_on_new() ()
from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#9 0x00007f3e11764fe8 in
dsn::replication::replica_stub::new_replica(dsn::gpid, dsn::app_info const&,
bool, bool, std::string const&) () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#10 0x00007f3e1176564f in
dsn::replication::replica_stub::create_child_replica_if_not_found(dsn::gpid,
dsn::app_info*, std::string const&) () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#11 0x00007f3e11765917 in
dsn::replication::replica_stub::create_child_replica(dsn::rpc_address,
dsn::app_info, long, dsn::gpid, dsn::gpid, std::string const&) () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#12 0x00007f3e117ee1a6 in std::_Function_handler<void (), std::_Bind<void
(dsn::replication::replica_stub::*(dsn::replication::replica_stub*,
dsn::rpc_address, dsn::app_info, long, dsn::gpid, dsn::gpid,
std::string))(dsn::rpc_address, dsn::app_info, long, dsn::gpid, dsn::gpid,
std::string const&)> >::_M_invoke(std::_Any_data const&) () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#13 0x00007f3e11929f21 in dsn::task::exec_internal() () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#14 0x00007f3e1193f422 in dsn::task_worker::loop() () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#15 0x00007f3e1193f5a0 in dsn::task_worker::run_internal() () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#16 0x00007f3e11125e9f in ?? () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_utils.so
#17 0x00007f3e0f2b5ea5 in start_thread () from /lib64/libpthread.so.0
#18 0x00007f3e0d785b0d in clone () from /lib64/libc.so.6
Thread 272 (Thread 0x7f3df45bb700 (LWP 25826)):
#0 0x00007f3e0f2bbb3b in do_futex_wait.constprop.1 () from
/lib64/libpthread.so.0
#1 0x00007f3e0f2bbbcf in __new_sem_wait_slow.constprop.0 () from
/lib64/libpthread.so.0
#2 0x00007f3e0f2bbc6b in sem_wait@@GLIBC_2.2.5 () from
/lib64/libpthread.so.0
#3 0x00007f3e1196a132 in dsn::tools::std_rwlock_nr_provider::lock_write()
() from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#4 0x00007f3e118f8e0d in dsn::zrwlock_nr::lock_write() () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#5 0x00007f3e117653a3 in
dsn::replication::replica_stub::create_child_replica_if_not_found(dsn::gpid,
dsn::app_info*, std::string const&) () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#6 0x00007f3e11765917 in
dsn::replication::replica_stub::create_child_replica(dsn::rpc_address,
dsn::app_info, long, dsn::gpid, dsn::gpid, std::string const&) () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#7 0x00007f3e117ee1a6 in std::_Function_handler<void (), std::_Bind<void
(dsn::replication::replica_stub::*(dsn::replication::replica_stub*,
dsn::rpc_address, dsn::app_info, long, dsn::gpid, dsn::gpid,
std::string))(dsn::rpc_address, dsn::app_info, long, dsn::gpid, dsn::gpid,
std::string const&)> >::_M_invoke(std::_Any_data const&) () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#8 0x00007f3e11929f21 in dsn::task::exec_internal() () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#9 0x00007f3e1193f422 in dsn::task_worker::loop() () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#10 0x00007f3e1193f5a0 in dsn::task_worker::run_internal() () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#11 0x00007f3e11125e9f in ?? () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_utils.so
#12 0x00007f3e0f2b5ea5 in start_thread () from /lib64/libpthread.so.0
#13 0x00007f3e0d785b0d in clone () from /lib64/libc.so.6
Thread 271 (Thread 0x7f3df3dba700 (LWP 25827)):
#0 0x00007f3e0f2bbb3b in do_futex_wait.constprop.1 () from
/lib64/libpthread.so.0
#1 0x00007f3e0f2bbbcf in __new_sem_wait_slow.constprop.0 () from
/lib64/libpthread.so.0
#2 0x00007f3e0f2bbc6b in sem_wait@@GLIBC_2.2.5 () from
/lib64/libpthread.so.0
#3 0x00007f3e1196a132 in dsn::tools::std_rwlock_nr_provider::lock_write()
() from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#4 0x00007f3e118f8e0d in dsn::zrwlock_nr::lock_write() () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#5 0x00007f3e117653a3 in
dsn::replication::replica_stub::create_child_replica_if_not_found(dsn::gpid,
dsn::app_info*, std::string const&) () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#6 0x00007f3e11765917 in
dsn::replication::replica_stub::create_child_replica(dsn::rpc_address,
dsn::app_info, long, dsn::gpid, dsn::gpid, std::string const&) () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#7 0x00007f3e117ee1a6 in std::_Function_handler<void (), std::_Bind<void
(dsn::replication::replica_stub::*(dsn::replication::replica_stub*,
dsn::rpc_address, dsn::app_info, long, dsn::gpid, dsn::gpid,
std::string))(dsn::rpc_address, dsn::app_info, long, dsn::gpid, dsn::gpid,
std::string const&)> >::_M_invoke(std::_Any_data const&) () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#8 0x00007f3e11929f21 in dsn::task::exec_internal() () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#9 0x00007f3e1193f422 in dsn::task_worker::loop() () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#10 0x00007f3e1193f5a0 in dsn::task_worker::run_internal() () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#11 0x00007f3e11125e9f in ?? () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_utils.so
#12 0x00007f3e0f2b5ea5 in start_thread () from /lib64/libpthread.so.0
#13 0x00007f3e0d785b0d in clone () from /lib64/libc.so.6
Thread 270 (Thread 0x7f3df35b9700 (LWP 25828)):
#0 0x00007f3e0f2bbb3b in do_futex_wait.constprop.1 () from
/lib64/libpthread.so.0
#1 0x00007f3e0f2bbbcf in __new_sem_wait_slow.constprop.0 () from
/lib64/libpthread.so.0
#2 0x00007f3e0f2bbc6b in sem_wait@@GLIBC_2.2.5 () from
/lib64/libpthread.so.0
#3 0x00007f3e1196a132 in dsn::tools::std_rwlock_nr_provider::lock_write()
() from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#4 0x00007f3e118f8e0d in dsn::zrwlock_nr::lock_write() () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#5 0x00007f3e117653a3 in
dsn::replication::replica_stub::create_child_replica_if_not_found(dsn::gpid,
dsn::app_info*, std::string const&) () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#6 0x00007f3e11765917 in
dsn::replication::replica_stub::create_child_replica(dsn::rpc_address,
dsn::app_info, long, dsn::gpid, dsn::gpid, std::string const&) () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#7 0x00007f3e117ee1a6 in std::_Function_handler<void (), std::_Bind<void
(dsn::replication::replica_stub::*(dsn::replication::replica_stub*,
dsn::rpc_address, dsn::app_info, long, dsn::gpid, dsn::gpid,
std::string))(dsn::rpc_address, dsn::app_info, long, dsn::gpid, dsn::gpid,
std::string const&)> >::_M_invoke(std::_Any_data const&) () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#8 0x00007f3e11929f21 in dsn::task::exec_internal() () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#9 0x00007f3e1193f422 in dsn::task_worker::loop() () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#10 0x00007f3e1193f5a0 in dsn::task_worker::run_internal() () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#11 0x00007f3e11125e9f in ?? () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_utils.so
#12 0x00007f3e0f2b5ea5 in start_thread () from /lib64/libpthread.so.0
#13 0x00007f3e0d785b0d in clone () from /lib64/libc.so.6
Thread 269 (Thread 0x7f3df2db8700 (LWP 25829)):
#0 0x00007f3e0f2bbb3b in do_futex_wait.constprop.1 () from
/lib64/libpthread.so.0
#1 0x00007f3e0f2bbbcf in __new_sem_wait_slow.constprop.0 () from
/lib64/libpthread.so.0
#2 0x00007f3e0f2bbc6b in sem_wait@@GLIBC_2.2.5 () from
/lib64/libpthread.so.0
#3 0x00007f3e1196a132 in dsn::tools::std_rwlock_nr_provider::lock_write()
() from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#4 0x00007f3e118f8e0d in dsn::zrwlock_nr::lock_write() () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#5 0x00007f3e117653a3 in
dsn::replication::replica_stub::create_child_replica_if_not_found(dsn::gpid,
dsn::app_info*, std::string const&) () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#6 0x00007f3e11765917 in
dsn::replication::replica_stub::create_child_replica(dsn::rpc_address,
dsn::app_info, long, dsn::gpid, dsn::gpid, std::string const&) () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#7 0x00007f3e117ee1a6 in std::_Function_handler<void (), std::_Bind<void
(dsn::replication::replica_stub::*(dsn::replication::replica_stub*,
dsn::rpc_address, dsn::app_info, long, dsn::gpid, dsn::gpid,
std::string))(dsn::rpc_address, dsn::app_info, long, dsn::gpid, dsn::gpid,
std::string const&)> >::_M_invoke(std::_Any_data const&) () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#8 0x00007f3e11929f21 in dsn::task::exec_internal() () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#9 0x00007f3e1193f422 in dsn::task_worker::loop() () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#10 0x00007f3e1193f5a0 in dsn::task_worker::run_internal() () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#11 0x00007f3e11125e9f in ?? () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_utils.so
#12 0x00007f3e0f2b5ea5 in start_thread () from /lib64/libpthread.so.0
#13 0x00007f3e0d785b0d in clone () from /lib64/libc.so.6
Thread 268 (Thread 0x7f3df25b7700 (LWP 25830)):
#0 0x00007f3e0f2bbb3b in do_futex_wait.constprop.1 () from
/lib64/libpthread.so.0
#1 0x00007f3e0f2bbbcf in __new_sem_wait_slow.constprop.0 () from
/lib64/libpthread.so.0
#2 0x00007f3e0f2bbc6b in sem_wait@@GLIBC_2.2.5 () from
/lib64/libpthread.so.0
#3 0x00007f3e1196a132 in dsn::tools::std_rwlock_nr_provider::lock_write()
() from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#4 0x00007f3e118f8e0d in dsn::zrwlock_nr::lock_write() () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#5 0x00007f3e117653a3 in
dsn::replication::replica_stub::create_child_replica_if_not_found(dsn::gpid,
dsn::app_info*, std::string const&) () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#6 0x00007f3e11765917 in
dsn::replication::replica_stub::create_child_replica(dsn::rpc_address,
dsn::app_info, long, dsn::gpid, dsn::gpid, std::string const&) () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#7 0x00007f3e117ee1a6 in std::_Function_handler<void (), std::_Bind<void
(dsn::replication::replica_stub::*(dsn::replication::replica_stub*,
dsn::rpc_address, dsn::app_info, long, dsn::gpid, dsn::gpid,
std::string))(dsn::rpc_address, dsn::app_info, long, dsn::gpid, dsn::gpid,
std::string const&)> >::_M_invoke(std::_Any_data const&) () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#8 0x00007f3e11929f21 in dsn::task::exec_internal() () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#9 0x00007f3e1193f422 in dsn::task_worker::loop() () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#10 0x00007f3e1193f5a0 in dsn::task_worker::run_internal() () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#11 0x00007f3e11125e9f in ?? () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_utils.so
#12 0x00007f3e0f2b5ea5 in start_thread () from /lib64/libpthread.so.0
#13 0x00007f3e0d785b0d in clone () from /lib64/libc.so.6
Thread 267 (Thread 0x7f3df1db6700 (LWP 25831)):
#0 0x00007f3e0f2bbb3b in do_futex_wait.constprop.1 () from
/lib64/libpthread.so.0
#1 0x00007f3e0f2bbbcf in __new_sem_wait_slow.constprop.0 () from
/lib64/libpthread.so.0
#2 0x00007f3e0f2bbc6b in sem_wait@@GLIBC_2.2.5 () from
/lib64/libpthread.so.0
#3 0x00007f3e1196a132 in dsn::tools::std_rwlock_nr_provider::lock_write()
() from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#4 0x00007f3e118f8e0d in dsn::zrwlock_nr::lock_write() () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#5 0x00007f3e117653a3 in
dsn::replication::replica_stub::create_child_replica_if_not_found(dsn::gpid,
dsn::app_info*, std::string const&) () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#6 0x00007f3e11765917 in
dsn::replication::replica_stub::create_child_replica(dsn::rpc_address,
dsn::app_info, long, dsn::gpid, dsn::gpid, std::string const&) () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#7 0x00007f3e117ee1a6 in std::_Function_handler<void (), std::_Bind<void
(dsn::replication::replica_stub::*(dsn::replication::replica_stub*,
dsn::rpc_address, dsn::app_info, long, dsn::gpid, dsn::gpid,
std::string))(dsn::rpc_address, dsn::app_info, long, dsn::gpid, dsn::gpid,
std::string const&)> >::_M_invoke(std::_Any_data const&) () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#8 0x00007f3e11929f21 in dsn::task::exec_internal() () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#9 0x00007f3e1193f422 in dsn::task_worker::loop() () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#10 0x00007f3e1193f5a0 in dsn::task_worker::run_internal() () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#11 0x00007f3e11125e9f in ?? () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_utils.so
#12 0x00007f3e0f2b5ea5 in start_thread () from /lib64/libpthread.so.0
#13 0x00007f3e0d785b0d in clone () from /lib64/libc.so.6
Thread 266 (Thread 0x7f3df15b5700 (LWP 25832)):
#0 0x00007f3e0f2bbb3b in do_futex_wait.constprop.1 () from
/lib64/libpthread.so.0
#1 0x00007f3e0f2bbbcf in __new_sem_wait_slow.constprop.0 () from
/lib64/libpthread.so.0
#2 0x00007f3e0f2bbc6b in sem_wait@@GLIBC_2.2.5 () from
/lib64/libpthread.so.0
#3 0x00007f3e1196a132 in dsn::tools::std_rwlock_nr_provider::lock_write()
() from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#4 0x00007f3e118f8e0d in dsn::zrwlock_nr::lock_write() () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#5 0x00007f3e117653a3 in
dsn::replication::replica_stub::create_child_replica_if_not_found(dsn::gpid,
dsn::app_info*, std::string const&) () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#6 0x00007f3e11765917 in
dsn::replication::replica_stub::create_child_replica(dsn::rpc_address,
dsn::app_info, long, dsn::gpid, dsn::gpid, std::string const&) () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#7 0x00007f3e117ee1a6 in std::_Function_handler<void (), std::_Bind<void
(dsn::replication::replica_stub::*(dsn::replication::replica_stub*,
dsn::rpc_address, dsn::app_info, long, dsn::gpid, dsn::gpid,
std::string))(dsn::rpc_address, dsn::app_info, long, dsn::gpid, dsn::gpid,
std::string const&)> >::_M_invoke(std::_Any_data const&) () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#8 0x00007f3e11929f21 in dsn::task::exec_internal() () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#9 0x00007f3e1193f422 in dsn::task_worker::loop() () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#10 0x00007f3e1193f5a0 in dsn::task_worker::run_internal() () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_replica_server.so
#11 0x00007f3e11125e9f in ?? () from
/sensorsdata/main/program/skv/skv_offline/replica_server/lib/libdsn_utils.so
#12 0x00007f3e0f2b5ea5 in start_thread () from /lib64/libpthread.so.0
#13 0x00007f3e0d785b0d in clone () from /lib64/libc.so.6
```
Piece of the config:
```
[threadpool.THREAD_POOL_DEFAULT]
name = default
partitioned = false
worker_priority = THREAD_xPRIORITY_NORMAL
worker_count = 8
```
As shown above, the `THREAD_POOL_DEFAULT` thread-pool has 8 threads, the
table to be split has 8 partitions too, and the cluster has only 1 replica
server.
When received the partition split request, all the 8 partitions start to add
child replicas:
```
tasking::enqueue(LPC_CREATE_CHILD,
tracker(),
std::bind(&replica_stub::create_child_replica,
_stub,
_replica->_config.hp_primary,
_replica->_app_info,
_child_init_ballot,
_child_gpid,
get_gpid(),
_replica->_dir),
get_gpid().thread_hash());
```
The tasks are enqueued as task code `LPC_CREATE_CHILD` which is dealt by
`THREAD_POOL_DEFAULT` thread-pool. Now all the 8 threads are exhausted. When
one of them start to create the replica info `replica_app_info::store()`, it is
enqued as `LPC_AIO_INFO_WRITE` which is also use thread-pool
`THREAD_POOL_DEFAULT`. Now no more threads are avaiable.
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