This is happening to me each 15 minutes on Docker for Mac 1.11.0 beta9. Unusable. OSX 10.11.4
May 3 22:21:43 AfraHackintosh Docker[30687] <Notice>: dockerState = running
May 3 22:21:57 AfraHackintosh Docker[85607] <Notice>: Creating resource Entry(259689ec8a6d0d073cad850a2c49435954770d9af4e8147db4f2cd68b1b85a60)
May 3 22:21:57 AfraHackintosh Docker[85607] <Notice>: Write offset=0 data=[259689ec8a6d0d073cad850a2c49435954770d9af4e8147db4f2cd68b1b85a60:/Users/alan/sources/apt-current/packaging/ubuntu-trusty/out:/Users/alan/sources/apt-current/packaging/ubuntu-trusty/build-inside:/Users/alan/sources/apt-current/packaging/ubuntu-trusty/../../] to file
May 3 22:21:57 AfraHackintosh Docker[85607] <Notice>: Volume.start 259689ec8a6d0d073cad850a2c49435954770d9af4e8147db4f2cd68b1b85a60 (paths = [/Users/alan/sources/apt-current/packaging/ubuntu-trusty/out, /Users/alan/sources/apt-current/packaging/ubuntu-trusty/build-inside, /Users/alan/sources/apt-current/packaging/ubuntu-trusty/../../])
May 3 22:21:57 AfraHackintosh Docker[85607] <Notice>: Created instance 259689ec8a6d0d073cad850a2c49435954770d9af4e8147db4f2cd68b1b85a60
May 3 22:21:58 AfraHackintosh Docker[85607] <Notice>: Volume.stop 259689ec8a6d0d073cad850a2c49435954770d9af4e8147db4f2cd68b1b85a60 (paths = [/Users/alan/sources/apt-current/packaging/ubuntu-trusty/out, /Users/alan/sources/apt-current/packaging/ubuntu-trusty/build-inside, /Users/alan/sources/apt-current/packaging/ubuntu-trusty/../../])
May 3 22:21:58 AfraHackintosh Docker[85607] <Error>: WATCH SUBSCRIBER REMOVAL INVARIANT VIOLATED
May 3 22:22:01 AfraHackintosh Docker[85607] <Notice>: Creating resource Entry(eff0047dcc840430a39b15a09bd7ef5bb465a3e285b16c1e0e89dd1907785c0c)
May 3 22:22:01 AfraHackintosh Docker[85607] <Notice>: Write offset=0 data=[eff0047dcc840430a39b15a09bd7ef5bb465a3e285b16c1e0e89dd1907785c0c:/Users/alan/sources/apt-current/packaging/ubuntu-trusty/test-inside:/Users/alan/sources/apt-current/packaging/ubuntu-trusty/out:/Users/alan/sources/apt-current/packaging/ubuntu-trusty/test-logs] to file
May 3 22:22:01 AfraHackintosh Docker[85607] <Notice>: Volume.start eff0047dcc840430a39b15a09bd7ef5bb465a3e285b16c1e0e89dd1907785c0c (paths = [/Users/alan/sources/apt-current/packaging/ubuntu-trusty/test-inside, /Users/alan/sources/apt-current/packaging/ubuntu-trusty/out, /Users/alan/sources/apt-current/packaging/ubuntu-trusty/test-logs])
May 3 22:22:01 AfraHackintosh Docker[85607] <Notice>: Created instance eff0047dcc840430a39b15a09bd7ef5bb465a3e285b16c1e0e89dd1907785c0c
May 3 22:24:00 AfraHackintosh Docker[85607] <Notice>: Volume.stop eff0047dcc840430a39b15a09bd7ef5bb465a3e285b16c1e0e89dd1907785c0c (paths = [/Users/alan/sources/apt-current/packaging/ubuntu-trusty/test-inside, /Users/alan/sources/apt-current/packaging/ubuntu-trusty/out, /Users/alan/sources/apt-current/packaging/ubuntu-trusty/test-logs])
May 3 22:42:31 AfraHackintosh Docker[85607] <Notice>: Creating resource Entry(6004ac3218496e7f52a9ffc5f716a92a017d0c18e02ac526bc644ce6d9fc294b)
May 3 22:42:31 AfraHackintosh Docker[85607] <Notice>: Write offset=0 data=[6004ac3218496e7f52a9ffc5f716a92a017d0c18e02ac526bc644ce6d9fc294b:/Users/alan/sources/apt-current/packaging/ubuntu-trusty/build-inside:/Users/alan/sources/apt-current/packaging/ubuntu-trusty/../../:/Users/alan/sources/apt-current/packaging/ubuntu-trusty/out] to file
May 3 22:42:31 AfraHackintosh Docker[85607] <Notice>: Volume.start 6004ac3218496e7f52a9ffc5f716a92a017d0c18e02ac526bc644ce6d9fc294b (paths = [/Users/alan/sources/apt-current/packaging/ubuntu-trusty/build-inside, /Users/alan/sources/apt-current/packaging/ubuntu-trusty/../../, /Users/alan/sources/apt-current/packaging/ubuntu-trusty/out])
May 3 22:42:31 AfraHackintosh Docker[85607] <Notice>: Created instance 6004ac3218496e7f52a9ffc5f716a92a017d0c18e02ac526bc644ce6d9fc294b
May 3 22:42:31 AfraHackintosh Docker[85607] <Error>: Fatal unexpected exception: Invalid_argument("String.sub / Bytes.sub")
May 3 22:42:31 AfraHackintosh Docker[30707] <Notice>: Reap com.docker.driver.amd64-linux (pid 85607): exit status 1
May 3 22:42:33 AfraHackintosh Docker[30707] <Notice>: Stop 1 children with order 1: com.docker.driver.amd64-linux (pid 85609)
May 3 22:42:33 AfraHackintosh Docker[30707] <Notice>: Signal terminated to com.docker.driver.amd64-linux (pid 85609)
May 3 22:42:33 AfraHackintosh Docker[85609] <Notice>: sending SIGTERM to xhyve pid 85611
May 3 22:42:34 AfraHackintosh Docker[85609] <Notice>: virtio-net-ipc: initialising uuid=baa19ea3-0faf-4438-b408-6f558ce5103c,path=/var/tmp/com.docker.slirp.socket,macfile=/Users/alan/Library/Containers/com.docker.docker/Data/com.docker.driver.amd64-linux/mac.0
May 3 22:42:34 AfraHackintosh Docker[85609] <Notice>: Interface will have uuid baa19ea3-0faf-4438-b408-6f558ce5103c
May 3 22:42:34 AfraHackintosh Docker[85609] <Notice>: Connection established with MAC=c0:ff:ee:c0:ff:ee and MTU 1500
May 3 22:42:34 AfraHackintosh Docker[85609] <Notice>: virtio-9p: initialising path=/var/tmp/com.docker.db.socket,tag=db
May 3 22:42:34 AfraHackintosh Docker[85609] <Notice>: virtio-9p: initialising path=/var/tmp/com.docker.port.socket,tag=port
May 3 22:42:34 AfraHackintosh Docker[85609] <Notice>: linkname /Users/alan/Library/Containers/com.docker.docker/Data/com.docker.driver.amd64-linux/tty
May 3 22:42:34 AfraHackintosh Docker[85609] <Notice>: COM1 connected to /dev/ttys000
May 3 22:42:34 AfraHackintosh Docker[85609] <Notice>: COM1 linked to /Users/alan/Library/Containers/com.docker.docker/Data/com.docker.driver.amd64-linux/tty
May 3 22:42:34 AfraHackintosh Docker[85609] <Notice>: rdmsr to register 0x34 on vcpu 1
May 3 22:42:34 AfraHackintosh Docker[85608] <Notice>: PPP.listen: closing connection
May 3 22:42:34 AfraHackintosh Docker[85609] <Notice>:
May 3 22:42:34 AfraHackintosh Docker[81397] <Notice>: VM has shutdown at 2016-05-03 22:42:34 +0200 CEST
May 3 22:42:34 AfraHackintosh Docker[30707] <Notice>: Reap com.docker.driver.amd64-linux (pid 85609): exit status 0
May 3 22:42:34 AfraHackintosh Docker[30687] <Notice>: dockerState = starting
May 3 22:42:34 AfraHackintosh Docker[30707] <Notice>: Stop 2 children with order 2: com.docker.osxfs (pid 85607), com.docker.slirp (pid 85608)
May 3 22:42:34 AfraHackintosh Docker[30707] <Notice>: Signal terminated to com.docker.slirp (pid 85608)
May 3 22:42:34 AfraHackintosh Docker[30707] <Notice>: Reap com.docker.driver.amd64-linux (pid 85608): signal: terminated
May 3 22:42:34 AfraHackintosh Docker[30707] <Notice>: Starting com.docker.osxfs, com.docker.slirp, com.docker.driver.amd64-linux
May 3 22:42:34 AfraHackintosh Docker[30707] <Notice>: Start com.docker.osxfs (pid 86170)
May 3 22:42:34 AfraHackintosh Docker[30707] <Notice>: Start com.docker.slirp (pid 86171)
May 3 22:42:34 AfraHackintosh Docker[30707] <Notice>: Start com.docker.driver.amd64-linux (pid 86172)
May 3 22:42:34 AfraHackintosh Docker[86170] <Notice>: Logging to Apple System Log
May 3 22:42:34 AfraHackintosh Docker[86171] <Notice>: Logging to Apple System Log
May 3 22:42:34 AfraHackintosh Docker[86171] <Notice>: Setting handler to ignore all SIGPIPE signals
May 3 22:42:34 AfraHackintosh Docker[86171] <Notice>: attempting to reconnect to database
May 3 22:42:34 AfraHackintosh Docker[86171] <Notice>: reconnected transport layer
May 3 22:42:34 AfraHackintosh Docker[86171] <Notice>: allowing binds to any IP addresses
May 3 22:42:34 AfraHackintosh Docker[86171] <Notice>: starting in native mode port_control_path:fd:4 vsock_path:/var/tmp/com.docker.vsock/connect
May 3 22:42:34 AfraHackintosh Docker[86171] <Notice>: Starting slirp server socket_path:fd:3 port_control_path:fd:4 vsock_path:/var/tmp/com.docker.vsock/connect pcap_settings:disabled peer_ip:192.168.65.2 local_ip:192.168.65.1
May 3 22:42:34 AfraHackintosh Docker[86171] <Notice>: Starting slirp network stack on fd:3
May 3 22:42:34 AfraHackintosh Docker[86172] <Notice>: Acquired hypervisor lock
May 3 22:42:34 AfraHackintosh Docker[86172] <Notice>: Docker is not responding: waiting 0.5s
May 3 22:42:34 AfraHackintosh Docker[86172] <Notice>: hypervisor: native
May 3 22:42:34 AfraHackintosh Docker[86172] <Notice>: filesystem: osxfs
May 3 22:42:34 AfraHackintosh Docker[86172] <Notice>: Hypervisor: native; BootProtocol: direct; UefiBootDisk: /Users/alan/UefiBoot.qcow2
May 3 22:42:34 AfraHackintosh Docker[86174] <Notice>: exec[86174]: /Applications/Docker.app/Contents/MacOS/com.docker.xhyve []string{"/Applications/Docker.app/Contents/MacOS/com.docker.xhyve", "-A", "-m", "2G", "-c", "2", "-u", "-s", "0:0,hostbridge", "-s", "31,lpc", "-s", "2:0,virtio-ipc,uuid=baa19ea3-0faf-4438-b408-6f558ce5103c,path=/var/tmp/com.docker.slirp.socket,macfile=/Users/alan/Library/Containers/com.docker.docker/Data/com.docker.driver.amd64-linux/mac.0", "-s", "3,virtio-blk,file:///Users/alan/Lib