[systemd-bugs] [Bug 87603] New: systemd pid 1 breaks after receiving sigquit

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87603

            Bug ID: 87603
           Summary: systemd pid 1 breaks after receiving sigquit
           Product: systemd
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: general
          Assignee: systemd-bugs at lists.freedesktop.org
          Reporter: grossws at gmail.com
        QA Contact: systemd-bugs at lists.freedesktop.org

Component: systemd pid 1

OS: centos 7.0

Summary: systemd --system dbus interface not working after systemd received
SIGQUIT (3) from root.

E. g. `kill -SIGQUIT 1` by root leads to logging something like this:

Dec 22 20:31:39 test systemd[1]: Caught <QUIT>, dumped core as pid 3871.
Dec 22 20:31:39 test systemd[1]: Freezing execution.


After that `systemctl` is useless since systemd isn't responding to dbus
interface:

[root at test ~]# systemctl reboot
Failed to get D-Bus connection: Failed to connect to socket
/run/systemd/private: Connection refused

Also, `reboot` doesn't work:

[root at test ~]# reboot
Failed to open /dev/initctl: No such device or address
Failed to talk to init daemon.


Reproduce: run `kill -SIGQUIT 1` under root.

Env: 
- Linux test 3.10.0-123.9.3.el7.x86_64 #1 SMP Thu Nov 6 15:06:03 UTC 2014
x86_64 x86_64 x86_64 GNU/Linux
- systemd-208-11.el7_0.5.x86_64

See also: https://gist.github.com/grossws/545fdcbc2c5d2703c89c

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