[Bug 1316582] [NEW] juju command spontaneously hangs/crashes while running on armhf

[Oleg Strikov]

Public bug reported:

ubuntu at mw01-02:~$ juju --version
1.18.1-trusty-armhf

ubuntu at mw01-02:~$ uname -a
Linux mw01-02 3.13.0-24-generic-lpae #46-Ubuntu SMP Thu Apr 10 21:01:14 UTC 2014 armv7l armv7l armv7l GNU/Linux

ubuntu at mw01-02:~$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=14.04
DISTRIB_CODENAME=trusty
DISTRIB_DESCRIPTION="Ubuntu 14.04 LTS"

ubuntu at mw01-02:~$ juju bootstrap --constraints arch=armhf --debug
<...>
Running apt-get update
Installing package: git
Installing package: curl
Installing package: cpu-checker
Installing package: bridge-utils
Installing package: rsyslog-gnutls
Installing package: juju-mongodb
Fetching tools: curl -sSfw 'tools from %{url_effective} downloaded: HTTP %{http_code}; time %{time_total}s; size %{size_download} bytes; speed %{speed_download} bytes/s ' -o $bin/tools.tar.gz 'https://streams.canonical.com/juju/tools/releases/juju-1.18.2-trusty-armhf.tgz'
Starting MongoDB server (juju-db)
Bootstrapping Juju machine agent
Starting Juju machine agent (jujud-machine-0)
2014-05-06 11:15:50 INFO juju.cmd supercommand.go:306 command finished
<HANGS>

ubuntu at mw01-02:~$ juju status
environment: maas
machines:
  "0":
    agent-state: started
    agent-version: 1.18.2
    dns-name: mw01-04.1ss
    instance-id: /MAAS/api/1.0/nodes/node-8cd85c4e-d062-11e3-bdfd-000173020cf5/
    series: trusty
services:
  mysql:
    charm: local:trusty/mysql-311
    exposed: false
    relations:
      cluster:
      - mysql
    units:
      mysql/0:
        agent-state: started
        agent-version: 1.18.2
        machine: "0"
        public-address: mw01-04.1ss
  wordpress:
    charm: local:trusty/wordpress-93
    exposed: false
    relations:
      loadbalancer:
      - wordpress
    units:
      wordpress/0:
        agent-state: pending
        agent-version: 1.18.2
        machine: "0"
        public-address: mw01-04.1ss
<HANGS>

When application hangs I observe the following issue in ps:
ubuntu at mw01-02:~$ ps aux | grep juju
ubuntu    9696 47.7  0.0      0     0 pts/0    Zl+  12:11   3:38 [juju] <defunct>

** Affects: juju-core (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1316582

Title:
  juju command spontaneously hangs/crashes while running on armhf

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