Happening in VirtualBox during a race condition looks like.
sudo systemctl stop networking
sudo systemctl restart onion-grater
Log:
Aug 14 17:28:39 host systemd[1]: Starting Tor control port filter proxy...
Aug 14 17:28:39 host audit[18942]: AVC apparmor=“DENIED” operation=“open” profile=“/usr/lib/onion-grater” name=“/sys/devices/pci0000:00/0000:00:16.0/host4/port-4:0/end_device-4:0/target4:0:0/4:0:0:0/block/sda/queue/hw_sector_size” pid=18942 comm=“onion-grater” requested_mask=“r” denied_mask=“r” fsuid=114 ouid=0
Aug 14 17:28:39 host audit[18942]: SYSCALL arch=c000003e syscall=2 success=no exit=-13 a0=7f470c3c61b8 a1=80000 a2=1b6 a3=20 items=1 ppid=1 pid=18942 auid=4294967295 uid=114 gid=119 euid=114 suid=114 fsuid=114 egid=119 sgid=119 fsgid=119 tty=(none) ses=4294967295 comm="onion-grater" exe="/usr/bin/python3.5" key=(null)
Aug 14 17:28:39 host audit: CWD cwd="/"
Aug 14 17:28:39 host audit: PATH item=0 name="/sys/block/sda/queue/hw_sector_size" inode=7729 dev=00:10 mode=0100444 ouid=0 ogid=0 rdev=00:00 nametype=NORMAL
Aug 14 17:28:39 host audit: PROCTITLE proctitle=2F7573722F62696E2F707974686F6E33002D75002F7573722F6C69622F6F6E696F6E2D677261746572002D2D6465627567002D2D6C697374656E2D696E746572666163650065746831
Aug 14 17:28:39 host onion-grater[18942]: Traceback (most recent call last):
Aug 14 17:28:39 host onion-grater[18942]: File "/usr/lib/onion-grater", line 770, in <module>
Aug 14 17:28:39 host onion-grater[18942]: main()
Aug 14 17:28:39 host onion-grater[18942]: File "/usr/lib/onion-grater", line 752, in main
Aug 14 17:28:39 host onion-grater[18942]: ip_address = get_ip_address(global_args.listen_interface)
Aug 14 17:28:39 host onion-grater[18942]: File "/usr/lib/onion-grater", line 193, in get_ip_address
Aug 14 17:28:39 host onion-grater[18942]: struct.pack('256s', bytes(ifname[:15], 'utf-8'))
Aug 14 17:28:39 host onion-grater[18942]: OSError: [Errno 99] Cannot assign requested address
Aug 14 17:28:39 host systemd[1]: onion-grater.service: Main process exited, code=exited, status=1/FAILURE
Aug 14 17:28:39 host systemd[1]: Failed to start Tor control port filter proxy.