Internal maintenance can cause backup to be stuck

Hello

I think i already reported that.
A maintenance can start for a client that is currently backuping.
i think that also new backups can start while a maintenance is running, for the same client.

And when both run at the same time, process can get stucks, ie urbackup process is not crashing and web ui is responding, but cleanup and backups are not progressing.

Its 10:48am

Maintenance logs :

28/11/18 08:03 DEBUG Client with id=10 has 3 full file backups max=2
28/11/18 08:03 INFO Deleting full file backup ( id=5750, backuptime=2018-04-30 10:04:55, path=180430-1204 ) from client “ct03.zzz” ( id=10 ) …
28/11/18 08:31 INFO Done.
28/11/18 08:31 DEBUG Client with id=6 has 0 full file backups max=2
28/11/18 08:31 DEBUG Client with id=6 has 0 incremental file backups max=4
28/11/18 08:31 DEBUG Client with id=3 has 2 full file backups max=2
28/11/18 08:31 DEBUG Client with id=3 has 5 incremental file backups max=4
28/11/18 08:31 INFO Deleting incremental file backup ( id=8074, backuptime=2018-11-11 16:04:42, path=181111-1704 ) from client “ct02.zzz” ( id=3 ) …
28/11/18 08:48 INFO Done.
28/11/18 08:48 DEBUG Client with id=4 has 3 full file backups max=3
28/11/18 08:48 DEBUG Client with id=4 has 6 incremental file backups max=5
28/11/18 08:48 INFO Deleting incremental file backup ( id=8183, backuptime=2018-11-20 06:32:30, path=181120-0732 ) from client “ct01.zzz” ( id=4 ) …
28/11/18 08:48 INFO Done.
28/11/18 08:48 DEBUG Client with id=8 has 1 full file backups max=1
28/11/18 08:48 DEBUG Client with id=8 has 5 incremental file backups max=4
28/11/18 08:48 INFO Deleting incremental file backup ( id=8155, backuptime=2018-11-18 06:02:21, path=181118-0700 ) from client “ct01.zzz[gg]” ( id=8 ) …
28/11/18 08:49 INFO Done.
28/11/18 08:49 DEBUG Client with id=9 has 2 full file backups max=2
28/11/18 08:49 DEBUG Client with id=9 has 5 incremental file backups max=4
28/11/18 08:49 INFO Deleting incremental file backup ( id=8110, backuptime=2018-11-14 13:27:30, path=181114-1426 ) from client “ct01.zzz[jj]” ( id=9 ) …

Backup logs of “ct01.zzz[jj]” ( id=9 ):

28/11/18 08:52 DEBUG HT: Copying file: “/var/docker/data/urbackup-server/datas//ct01.zzz[jj]/181128-0703/someotherpath/classes.html”
28/11/18 08:52 DEBUG HT: Copying file: “/var/docker/data/urbackup-server/datas//ct01.zzz[jj]/181128-0703/someotherpath/groups.html”
28/11/18 08:52 DEBUG HT: Copying file: “/var/docker/data/urbackup-server/datas//ct01.zzz[jj]/181128-0703/someotherpath/index.html”
28/11/18 08:52 DEBUG HT: Copying file: “/var/docker/data/urbackup-server/datas//ct01.zzz[jj]/181128-0703/someotherpath/main.html”
28/11/18 08:52 DEBUG HT: Copying file: “/var/docker/data/urbackup-server/datas//ct01.zzz[jj]/181128-0703/someotherpath/methods-alphabetical.html”
28/11/18 08:52 DEBUG HT: Copying file: “/var/docker/data/urbackup-server/datas//ct01.zzz[jj]/181128-0703/someotherpath/methods-not-run.html”
28/11/18 08:52 DEBUG HT: Copying file: “/var/docker/data/urbackup-server/datas//ct01.zzz[jj]/181128-0703/someotherpath/methods.html”
28/11/18 08:52 DEBUG HT: Copying file: “/var/docker/data/urbackup-server/datas//ct01.zzz[jj]/181128-0703/someotherpath/reporter-output.html”
28/11/18 08:52 DEBUG HT: Copying file: “/var/docker/data/urbackup-server/datas//ct01.zzz[jj]/181128-0703/someotherpath/testng.xml.html”
28/11/18 08:52 DEBUG HT: Copying file: “/var/docker/data/urbackup-server/datas//ct01.zzz[jj]/181128-0703/someotherpath/toc.html”
28/11/18 08:52 DEBUG HT: Copying file: “/var/docker/data/urbackup-server/datas//ct01.zzz[jj]/181128-0703/somepath/junit/helpers/TestJavaTools.class”