TrueNAS Scale, The export of the pool is impossible

Hello,

It is impossible to export the pool.

> Storage> Export/disconnect

{{Error: concurrent.futures.process._RemoteTraceback:
"""
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/middlewared/plugins/zfs.py", line 197, in export
zfs.export_pool(pool)
File "libzfs.pyx", line 411, in libzfs.ZFS._exit_
File "/usr/lib/python3/dist-packages/middlewared/plugins/zfs.py", line 197, in export
zfs.export_pool(pool)
File "libzfs.pyx", line 1237, in libzfs.ZFS.export_pool
libzfs.ZFSException: pool or dataset is busy

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/usr/lib/python3.9/concurrent/futures/process.py", line 243, in _process_worker
r = call_item.fn(*call_item.args, **call_item.kwargs)
File "/usr/lib/python3/dist-packages/middlewared/worker.py", line 114, in main_worker
res = MIDDLEWARE._run(*call_args)
File "/usr/lib/python3/dist-packages/middlewared/worker.py", line 45, in _run
return self._call(name, serviceobj, methodobj, args, job=job)
File "/usr/lib/python3/dist-packages/middlewared/worker.py", line 39, in _call
return methodobj(*params)
File "/usr/lib/python3/dist-packages/middlewared/worker.py", line 39, in _call
return methodobj(*params)
File "/usr/lib/python3/dist-packages/middlewared/schema.py", line 1276, in nf
return func(*args, **kwargs)
File "/usr/lib/python3/dist-packages/middlewared/plugins/zfs.py", line 199, in export
raise CallError(str(e))
middlewared.service_exception.CallError: [EFAULT] pool or dataset is busy
"""

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/middlewared/job.py", line 411, in run
await self.future
File "/usr/lib/python3/dist-packages/middlewared/job.py", line 446, in __run_body
rv = await self.method(*([self] + args))
File "/usr/lib/python3/dist-packages/middlewared/schema.py", line 1272, in nf
return await func(*args, **kwargs)
File "/usr/lib/python3/dist-packages/middlewared/schema.py", line 1140, in nf
res = await f(*args, **kwargs)
File "/usr/lib/python3/dist-packages/middlewared/plugins/pool.py", line 1628, in export
await self.middleware.call('zfs.pool.export', pool['name'])
File "/usr/lib/python3/dist-packages/middlewared/main.py", line 1345, in call
return await self._call(
File "/usr/lib/python3/dist-packages/middlewared/main.py", line 1302, in _call
return await self._call_worker(name, *prepared_call.args)
File "/usr/lib/python3/dist-packages/middlewared/main.py", line 1308, in _call_worker
return await self.run_in_proc(main_worker, name, args, job)
File "/usr/lib/python3/dist-packages/middlewared/main.py", line 1223, in run_in_proc
return await self.run_in_executor(self.__procpool, method, *args, **kwargs)
File "/usr/lib/python3/dist-packages/middlewared/main.py", line 1206, in run_in_executor
return await loop.run_in_executor(pool, functools.partial(method, *args, **kwargs))
middlewared.service_exception.CallError: [EFAULT] pool or dataset is busy
}}

Another attempt to do this through the cli

{{root@nas1[~]# zpool export -f Backup
cannot unmount '/var/db/system/syslog-a79f32b3a852420ca0f9433c4fd6884f': pool or dataset is busy

root@nas1[~]# lsof /var/db/system/syslog-a79f32b3a852420ca0f9433c4fd6884f
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
asyncio_l 713 root 54w REG 0,59 240369 138 /var/db/system/syslog-a79f32b3a852420ca0f9433c4fd6884f/log/middlewared.log
asyncio_l 713 root 56w REG 0,59 0 142 /var/db/system/syslog-a79f32b3a852420ca0f9433c4fd6884f/log/zettarepl.log
syslog-ng 8164 root mem REG 0,59 16384 258 /var/db/system/syslog-a79f32b3a852420ca0f9433c4fd6884f/syslog-ng.persist
syslog-ng 8164 root 10u REG 0,59 16384 258 /var/db/system/syslog-a79f32b3a852420ca0f9433c4fd6884f/syslog-ng.persist
syslog-ng 8164 root 17w REG 0,59 1899913 139 /var/db/system/syslog-a79f32b3a852420ca0f9433c4fd6884f/log/syslog
syslog-ng 8164 root 18w REG 0,59 589051 137 /var/db/system/syslog-a79f32b3a852420ca0f9433c4fd6884f/log/messages
syslog-ng 8164 root 19w REG 0,59 1274327 132 /var/db/system/syslog-a79f32b3a852420ca0f9433c4fd6884f/log/daemon.log
syslog-ng 8164 root 22w REG 0,59 920877 134 /var/db/system/syslog-a79f32b3a852420ca0f9433c4fd6884f/log/error
syslog-ng 8164 root 26w REG 0,59 8041086 129 /var/db/system/syslog-a79f32b3a852420ca0f9433c4fd6884f/log/auth.log
}}

I tried to stop the services and eventually exported the pool, but after rebooting it was imported again.