"Disk Full" After a rsync failure?

So I ran an rsync over night in a tmux sessions. It was to copy contents from one mount to another (USB disks).

Rsync command was:

rsync --info=progress2 /mnt/wdpassport /mnt/wdredpro

When I woke up this morning I saw that my / is completely full. While I'm actually sure it is not.

What can I do to solve this?

Output of: df at the moment of unmounted wdredpro 4tb

Filesystem 1K-blocks Used Available Use% Mounted on
udev 8086632 0 8086632 0% /dev
tmpfs 1626320 5056 1621264 1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv 118882128 118746796 0 100% /
tmpfs 8131596 0 8131596 0% /dev/shm
tmpfs 5120 0 5120 0% /run/lock
tmpfs 8131596 0 8131596 0% /sys/fs/cgroup
/dev/nvme0n1p2 999320 207296 723212 23% /boot
/dev/nvme0n1p1 523248 8036 515212 2% /boot/efi
/dev/loop1 101760 101760 0 100% /snap/core/11606
/dev/loop2 56832 56832 0 100% /snap/core18/2074
/dev/loop0 101888 101888 0 100% /snap/core/11420
/dev/loop3 69248 69248 0 100% /snap/lxd/20326
/dev/loop4 33152 33152 0 100% /snap/snapd/12704
/dev/loop6 103424 103424 0 100% /snap/kotlin/61
/dev/loop5 33152 33152 0 100% /snap/snapd/12883
/dev/loop7 72064 72064 0 100% /snap/lxd/21029
/dev/loop8 56832 56832 0 100% /snap/core18/2128
/dev/loop9 102912 102912 0 100% /snap/kotlin/60
/dev/sdc2 1953214336 435989632 1517224704 23% /mnt/wdpassport
tmpfs 1626316 4 1626312 1% /run/user/1000

Output of: sudo fdisk -l

Disk /dev/loop0: 99.39 MiB, 104210432 bytes, 203536 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/loop1: 99.35 MiB, 104169472 bytes, 203456 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/loop2: 55.45 MiB, 58134528 bytes, 113544 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/loop3: 67.58 MiB, 70848512 bytes, 138376 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/loop4: 32.3 MiB, 33865728 bytes, 66144 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/loop5: 32.31 MiB, 33869824 bytes, 66152 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/loop6: 100.101 MiB, 105889792 bytes, 206816 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/loop7: 70.32 MiB, 73728000 bytes, 144000 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/nvme0n1: 232.91 GiB, 250059350016 bytes, 488397168 sectors
Disk model: Samsung SSD 970 EVO Plus 250GB
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: BB4634C4-D47E-49AA-8AC6-E576A2308C1A
Device Start End Sectors Size Type
/dev/nvme0n1p1 2048 1050623 1048576 512M EFI System
/dev/nvme0n1p2 1050624 3147775 2097152 1G Linux filesystem
/dev/nvme0n1p3 3147776 488394751 485246976 231.4G Linux filesystem
Disk /dev/mapper/ubuntu--vg-ubuntu--lv: 115.71 GiB, 124222701568 bytes, 242622464 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/sdb: 3.65 TiB, 4000787030016 bytes, 7814037168 sectors
Disk model: QuickPort Duo Cl
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 1FE11356-27C4-4CA4-9B4F-C41E4875C283
Device Start End Sectors Size Type
/dev/sdb1 2048 7814035455 7814033408 3.7T Microsoft basic data
Disk /dev/sda: 232.91 GiB, 250059350016 bytes, 488397168 sectors
Disk model: QuickPort Duo Cl
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 1FE11356-27C4-4CA4-9B4F-C41E4875C283
Device Start End Sectors Size Type
/dev/sda1 40 409639 409600 200M EFI System
/dev/sda2 409640 488392063 487982424 232.7G Microsoft basic data
Disk /dev/sdc: 1.84 TiB, 2000365289472 bytes, 3906963456 sectors
Disk model: My Passport 2626
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 192E2120-52C4-42F8-876B-92EB5E186258
Device Start End Sectors Size Type
/dev/sdc1 40 409639 409600 200M EFI System
/dev/sdc2 409640 3906961407 3906551768 1.8T Microsoft basic data
Disk /dev/loop8: 55.45 MiB, 58130432 bytes, 113536 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/loop9: 100.49 MiB, 105361408 bytes, 205784 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

Something is not right with the /dev/mapper/ubuntu but not sure how to fix.

When I try to run sudo du -a /home | sort -n -r | head -n 20 to see where the biggest files are coming from I'm getting this output:

sort: write failed: /tmp/sortDfVeHU: No space left on device

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