Docker for Mac 1.12.0-a locked up after exiting from a "docker exec" into a sytemd container

[jamshid]

Expected behavior

I can use a container that runs systemd (/usr/sbin/init).

Actual behavior

My sytem hung while I was trying to exit from a "docker exec" into a systemd / centos7 container. Seems to have locked up docker.

Docker and systemd tear linux apart.

Information

Diagnostic ID: ABD74BC9-C727-4923-9615-D27B17A1ADB4
Docker for Mac: 1.12.0-a (Build 11213)
macOS: Version 10.11.6 (Build 15G31)
[ERROR] docker-cli
docker ps failed
[OK] app
[OK] moby-syslog
[OK] disk
[OK] virtualization
[OK] system
[OK] menubar
[OK] osxfs
[OK] db
[OK] slirp
[OK] moby-console
[OK] logs
[OK] vmnetd
[OK] env
[OK] moby
[OK] driver.amd64-linux

Steps to reproduce

1. Sorry don't know, hopefully the logs are useful, run a systemd container and exec into it.

[mchiang0610]

Merging with #119

[dsheets]

Does this happen every time? Could you post a specific reproduction if so?

[docker-robott]

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