No space left on device - but there is plenty of space

[WoJWoJ]

Hello

I run Transmission 2.92 from within a systemd-nspawn container (Ubuntu 16.10 host and guest) and for a few days now torrents are blocked because of a

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`No space left on device`

error. There has been no changes (updates) neither on the host nor in the guest OK.

There is plenty of space:

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root@delug:~/completed# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda1       451G  113G  316G  27% /
tmpfs           3.9G     0  3.9G   0% /sys
tmpfs           3.9G     0  3.9G   0% /sys/fs/cgroup
tmpfs           3.9G     0  3.9G   0% /dev
tmpfs           3.9G     0  3.9G   0% /dev/shm
tmpfs           3.9G  148K  3.9G   1% /run
tmpfs           787M   34M  753M   5% /run/systemd/nspawn/incoming
tmpfs           3.9G  3.7G  235M  95% /tmp
/dev/sdb1       1.9T  960G  904G  52% /mnt/2TB/Media
tmpfs           5.0M     0  5.0M   0% /run/lock

Just for the sake of double-checking, I ran in the directory where the downloaded files arrive

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root@delug:~/completed# dd if=/dev/zero of=hello.bin bs=100 count=10000000
10000000+0 records in
10000000+0 records out
1000000000 bytes (1.0 GB, 954 MiB) copied, 10.284 s, 97.2 MB/s

so the amount of space is really not a problem.

When does exactly Transmission raises this error?