clamavとamavisd-newに以下のようなエラーログが出ていたので対応した。
Apr 18 11:28:26 hostname clamd[4731]: lstat() failed on: /var/lib/amavishome/tmp/amavis-20210418T112723-10120-wxSrl3Uw/parts Apr 18 11:28:26 hostname amavis[10120]: (10120-02-4) (!)run_av (ClamAV-clamd) FAILED - unexpected , output="/var/lib/amavishome/tmp/amavis-20210418T112723-10120-wxSrl3Uw/parts: lstat() failed: Permission denied. ERROR\n" Apr 18 11:28:26 hostname amavis[10120]: (10120-02-4) (!)ClamAV-clamd av-scanner FAILED: CODE(0x564868cfcda0) unexpected , output="/var/lib/amavishome/tmp/amavis-20210418T112723-10120-wxSrl3Uw/parts: lstat() failed: Permission denied. ERROR\n" at (eval 98) line 951. Apr 18 11:28:26 hostname amavis[10120]: (10120-02-4) (!)WARN: all primary virus scanners failed, considering backups