md2 write failed: user block quota too long on PHP compile??

[Richard G]

Last night I was swapping php versions on the servers. So php1_release and php3_release.
This ment changing them in custombuild and then running the da build update and da build php commands afterwards.

Now on 1 server, during the compiling of php or imagick or just after the compiling in between, I've seen this message appearing.
What could be the cause of this as I have way enough free space:

Filesystem      Size  Used Avail Use% Mounted on
devtmpfs        4.0M     0  4.0M   0% /dev
tmpfs            32G     0   32G   0% /dev/shm
tmpfs            13G   17M   13G   1% /run
/dev/md2        847G  298G  506G  38% /
/dev/md1        1.5G  585M  815M  42% /boot
/dev/loop0      9.3G  320K  8.8G   1% /tmp
/dev/sdb        1.8T   76G  1.7T   5% /backupdrive
tmpfs           6.3G  4.0K  6.3G   1% /run/user/0

and I checked, both user root and user diradmin do not have any quota's.
The /tmp is 8 GB but I can't imagine that getting totally full.
Also I have set the /tmp for directadmin in the directadmin.conf file to /datemp directory, so that could not be full during rebuild either.

Raid-check was mondaymorning early and no errors, SSD's are both fine in disk monitoring.

Do I need to worry or what could have caused this error? Only on 1 server, not on others.
I also do not know what is not written now. All seems fine, but still.... I don't like that kind of errors.