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Description of problem:
$subject

Version-Release number of selected component (if applicable):
systemd-219-30.el7_3.6.x86_64

How reproducible:
always

Steps to Reproduce:
1. Have following unit file,

$ cat /etc/systemd/system/crasher.service
[Service]
ExecStartPre=/bin/sleep 10
ExecStart=/bin/true

2. Reload systemd
$ systemctl daemon-reload

3. Start the service, remove unit file and reload systemd
$ systemctl --no-block start crasher.service && rm -f /etc/systemd/system/crasher.service && systemctl daemon-reload

4. Wait for 10 seconds

Actual results:
Feb 13 06:30:16 qeos-82.lab.eng.rdu2.redhat.com systemd[1]: Caught <ABRT>, dumped core as pid 1377.
Feb 13 06:30:16 qeos-82.lab.eng.rdu2.redhat.com systemd[1]: Freezing execution.

Above messages in journal, systemd is not responding to requests.

Expected results:
systemd can handle situation gracefully

Additional info:
upstream fix, 

https://github.com/systemd/systemd/commit/47fffb3530af3e3ad4048570611685635fde062e

https://github.com/lnykryn/systemd-rhel/pull/92

fix merged to upstream staging branch ->
                https://github.com/lnykryn/systemd-rhel/commit/a66f97acac8b99a49aac58adf6d652cad7e4be38
                -> post

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2017:2297