Docker restarts infinitely: "Failed to fork child process"

[ripper17]

Reproducible: Always

Steps to reproduce:

docker pull collabora/code
docker run -l debug -t -d -p My.IP.Add.ress:9980:9980 -e "domain=www\\.my\\-domain\\.tld\|my\-domain\\.tld" --restart always --cap-add MKNOD collabora/code

Expected result: Docker should start up fine

Actual result: Docker will restart over and over (filling up HDD space)

Logs: docker -l debug logs -f DOCKERID

Generating RSA private key, 2048 bit long modulus .......................................+++ ......................................................................................................................+++ e is 65537 (0x10001) Signature ok subject=/C=DE/ST=BW/L=Stuttgart/O=Dummy Authority/CN=localhost Getting CA Private Key loolforkit version details: 2.1.0 - b2e736a3 wsd-00024-00024 06:54:08.272296 [ loolwsd ] FTL Failed to fork child processes.| wsd/LOOLWSD.cpp:2405 Failed to fork child processes. wsd-00024-00024 06:54:08.274339 [ loolwsd ] FTL Failed to fork child processes.| wsd/LOOLWSD.cpp:2551 Failed to fork child processes. wsd-00024-00024 06:54:08.278844 [ loolwsd ] WRN Waking up dead poll thread [admin], started: false, finished: false| ./net/Socket.hpp:445 wsd-00024-00024 06:54:08.279161 [ loolwsd ] WRN Waking up dead poll thread [admin], started: false, finished: false| ./net/Socket.hpp:445 -00024 06:54:08.283357 [ loolwsd ] WRN Waking up dead poll thread [accept_poll], started: false, finished: false| ./net/Socket.hpp:445 -00024 06:54:08.283444 [ loolwsd ] WRN Waking up dead poll thread [accept_poll], started: false, finished: false| ./net/Socket.hpp:445 -00024 06:54:08.283526 [ loolwsd ] WRN Waking up dead poll thread [websrv_poll], started: false, finished: false| ./net/Socket.hpp:445 -00024 06:54:08.283566 [ loolwsd ] WRN Waking up dead poll thread [websrv_poll], started: false, finished: false| ./net/Socket.hpp:445 -00024 06:54:08.283630 [ loolwsd ] WRN Waking up dead poll thread [accept_poll], started: false, finished: false| ./net/Socket.hpp:445 -00024 06:54:08.283705 [ loolwsd ] WRN Waking up dead poll thread [accept_poll], started: false, finished: false| ./net/Socket.hpp:445 -00024 06:54:08.284083 [ loolwsd ] WRN Waking up dead poll thread [websrv_poll], started: false, finished: false| ./net/Socket.hpp:445 -00024 06:54:08.284149 [ loolwsd ] WRN Waking up dead poll thread [websrv_poll], started: false, finished: false| ./net/Socket.hpp:445 frk-00026-00026 06:54:08.289767 [ forkit ] FTL Pipe closed.| common/IoUtil.cpp:309

System information uname -a

4.4.0-78-generic #99-Ubuntu SMP Thu Apr 27 15:29:09 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

free -m

           total        used        free      shared  buff/cache   available

Mem: 3951 289 924 46 2737 3299 Swap: 1023 0 1023

This is more or less a cross-post from https://help.nextcloud.com/t/restarting-docker-results-in-failed-to-fork-child-processes/12209