Hello,
we run gdb and this is the result:
*(gdb) run
*Starting program: /usr/bin/urbackupsrv run -v debug
*[Thread debugging using libthread_db enabled]
*Using host libthread_db library “/lib/x86_64-linux-gnu/libthread_db.so.1”.
*2020-06-26 10:07:36: Starting HTTP-Server on port 55414
*2020-06-26 10:07:36: HTTP: Server started up successfully!
*[New Thread 0x7236b1b8c700 (LWP 3985)]
*[New Thread 0x7236b12e8700 (LWP 3986)]
*2020-06-26 10:07:36: SQLite: recovered 4834 frames from WAL file /var/urbackup/backup_server.db-wal code: 283
*2020-06-26 10:07:36: SQLite: recovered 174942 frames from WAL file /var/urbackup/backup_server_files.db-wal code: 283
*2020-06-26 10:07:36: SQLite: recovered 15282 frames from WAL file /var/urbackup/backup_server_link_journal.db-wal code: 283
*2020-06-26 10:07:36: SQLite: recovered 64523 frames from WAL file /var/urbackup/backup_server_links.db-wal code: 283
*2020-06-26 10:07:36: SQLite: recovered 2 frames from WAL file /var/urbackup/backup_server_settings.db-wal code: 283
*2020-06-26 10:07:37: SQLite: recovered 4834 frames from WAL file /var/urbackup/backup_server.db-wal code: 283
*2020-06-26 10:07:37: SQLite: recovered 2 frames from WAL file /var/urbackup/backup_server_settings.db-wal code: 283
*2020-06-26 10:07:37: SQLite: recovered 174942 frames from WAL file /var/urbackup/backup_server_files.db-wal code: 283
*2020-06-26 10:07:37: SQLite: recovered 64523 frames from WAL file /var/urbackup/backup_server_links.db-wal code: 283
*2020-06-26 10:07:37: SQLite: recovered 15282 frames from WAL file /var/urbackup/backup_server_link_journal.db-wal code: 283
*[New Thread 0x72368bfe3700 (LWP 3987)]
*2020-06-26 10:07:37: Started UrBackup…
*[New Thread 0x72368b745700 (LWP 3988)]
*2020-06-26 10:07:37: Removing temporary files…
*2020-06-26 10:07:37: Recreating temporary folder…
*MOUNT TEST OK
*2020-06-26 10:07:37: Testing if backup destination can handle subvolumes and snapshots…
*Testing for btrfs…
*ERROR: not a btrfs filesystem: /home/BACKUP/urbackup/testA54hj5luZtlorr494
*TEST FAILED: Creating test btrfs subvolume failed
*Testing for zfs…
*TEST FAILED: Dataset is not set via /etc/urbackup/dataset
*2020-06-26 10:07:37: Backup destination cannot handle subvolumes and snapshots. Snapshots disabled.
*2020-06-26 10:07:37: Testing if backup destination can handle filesystem transactions…
*2020-06-26 10:07:37: Testing for hardlinks in backup destination…
*2020-06-26 10:07:37: Could create hardlink at backup destination. Hardlinks enabled.
*2020-06-26 10:07:37: Testing for reflinks in backup destination…
*2020-06-26 10:07:37: Reflink ioctl failed. errno=25
*2020-06-26 10:07:37: Could not create reflink at backup destination. Reflinks disabled. Inappropriate ioctl for device (code: 25)
*Thread 5 “urbackupsrv” received signal SIGSEGV, Segmentation fault.
*[Switching to Thread 0x72368b745700 (LWP 3988)]
*0x000000000056c658 in ?? ()
*(gdb) bt
*#0 0x000000000056c658 in ?? ()
*#1 0x000000000056ee8a in ?? ()
*#2 0x00000000005cb791 in ?? ()
*#3 0x000000000045b04a in ?? ()
*#4 0x00007236b73156ba in start_thread (arg=0x72368b745700)
*at pthread_create.c:333
*#5 0x00007236b704b41d in clone ()
*at …/sysdeps/unix/sysv/linux/x86_64/clone.S:109
The OS is Ubuntu 16.04.6 LTS; Urbackup is 2.4.10 version. File System is ext4.
Thanks