/ file system is full, but du does not show that it's full

[c0re]

> why not to restart your httpd and mysqld?
> This may release your unused filehandles.
As I said I've restarted whole server, so nothing there to release at all.

> Another place to look for wasted space is filesystem snapshots, if any. They
> can be created implicitly, e. g., by fsck.
Yeah, I checked /.snap - nothing there.

> And... why lsof and not fstat(1)?
As I mentioned - fstat does not show full path including filename like
lsof does.