[Bug 1835354] Re: disco: ceph-mgr unable to load crash module under py3

[Michael Skalka]

Confirming this is present in Bionic-stein as well:

root at juju-1101fd-18-lxd-0:~# dpkg -l|grep ceph

ii  ceph                           13.2.6-0ubuntu0.19.04.1~cloud0                amd64        distributed storage and file system
ii  ceph-base                      13.2.6-0ubuntu0.19.04.1~cloud0                amd64        common ceph daemon libraries and management tools
ii  ceph-common                    13.2.6-0ubuntu0.19.04.1~cloud0                amd64        common utilities to mount and interact with a ceph storage cluster
ii  ceph-mgr                       13.2.6-0ubuntu0.19.04.1~cloud0                amd64        manager for the ceph distributed file system
ii  ceph-mon                       13.2.6-0ubuntu0.19.04.1~cloud0                amd64        monitor server for the ceph storage system
ii  ceph-osd                       13.2.6-0ubuntu0.19.04.1~cloud0                amd64        OSD server for the ceph storage system
ii  libcephfs2                     13.2.6-0ubuntu0.19.04.1~cloud0                amd64        Ceph distributed file system client library
ii  python3-cephfs                 13.2.6-0ubuntu0.19.04.1~cloud0                amd64        Python 3 libraries for the Ceph libcephfs library 

root at juju-1101fd-18-lxd-0:~# lsb_release -a  
No LSB modules are available. 
Distributor ID: Ubuntu  
Description:    Ubuntu 18.04.2 LTS 
Release:        18.04
Codename:       bionic  
root at juju-1101fd-18-lxd-0:~# ceph status
  cluster:      
    id:     832cb0a6-a3e7-11e9-bedc-00163e7eca36  
    health: HEALTH_WARN
            Module 'crash' has failed dependency: invalid syntax (module.py, line 48)  

  services:  
    mon: 3 daemons, quorum juju-1101fd-19-lxd-0,juju-1101fd-18-lxd-0,juju-1101fd-20-lxd-0
    mgr: juju-1101fd-18-lxd-0(active), standbys: juju-1101fd-19-lxd-0, juju-1101fd-20-lxd-0    
    osd: 72 osds: 72 up, 72 in    
    rgw: 3 daemons active 
          
  data:  
    pools:   18 pools, 2040 pgs  
    objects: 578  objects, 577 MiB 
    usage:   74 GiB used, 251 TiB / 252 TiB avail 
    pgs:     2040 active+clean   
             
  io:    
    client:   3.6 KiB/s rd, 3 op/s rd, 0 op/s wr

root at juju-1101fd-18-lxd-0:~# cat /var/log/ceph/ceph-mgr.juju-1101fd-18-lxd-0.log |grep -C10 syntax
2019-07-11 14:34:03.118 7fa37dd89300  0 pidfile_write: ignore empty --pid-file
2019-07-11 14:34:03.146 7fa37dd89300  1 mgr[py] Loading python module 'balancer'
2019-07-11 14:34:03.202 7fa37dd89300  1 mgr[py] Loading python module 'crash'
2019-07-11 14:34:03.242 7fa37dd89300 -1 mgr[py] Module not found: 'crash'
2019-07-11 14:34:03.242 7fa37dd89300 -1 mgr[py] Traceback (most recent call last):
  File "/usr/lib/x86_64-linux-gnu/ceph/mgr/crash/__init__.py", line 1, in <module> 
    from .module import Module    
  File "/usr/lib/x86_64-linux-gnu/ceph/mgr/crash/module.py", line 48
    def inner((_, meta)):
              ^ 
SyntaxError: invalid syntax
                  
2019-07-11 14:34:03.242 7fa37dd89300 -1 mgr[py] Class not found in module 'crash'
2019-07-11 14:34:03.242 7fa37dd89300 -1 mgr[py] Error loading module 'crash': (2) No such file or directory

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https://bugs.launchpad.net/bugs/1835354

Title:
  disco: ceph-mgr unable to load crash module under py3

Status in ceph package in Ubuntu:
  Fix Released
Status in ceph source package in Disco:
  Triaged
Status in ceph source package in Eoan:
  Fix Released

Bug description:
  [Impact]
  ceph-mgr daemon is unable to load the crash module due.

  [Test Case]
  Deploy ceph
  Check ceph-mgr log file
  Syntax error will be seen

  [Regression Potential]
  Minimal; python 3 syntax changes are well understood and this fix is already in the newer ceph release in eoan.

  [Original Bug Report]
  On startup the ceph-mgr daemon fails to load the crash module due to invalid Python 3 syntax:

  2019-07-04 04:11:54.533 7f1af75ab300  1 mgr[py] Loading python module 'crash'
  2019-07-04 04:11:54.605 7f1af75ab300 -1 mgr[py] Module not found: 'crash'
  2019-07-04 04:11:54.605 7f1af75ab300 -1 mgr[py] Traceback (most recent call last):

    File "/usr/lib/x86_64-linux-gnu/ceph/mgr/crash/__init__.py", line 1, in <module>
      from .module import Module
    File "/usr/lib/x86_64-linux-gnu/ceph/mgr/crash/module.py", line 48
      def inner((_, meta)):
                ^
  SyntaxError: invalid syntax

  Looking at the history for this module there are a number of
  syntax/compat fixes for Python3:

  https://github.com/ceph/ceph/commit/9aa1d49583ae8fb658967c054247cac6ec2125ab#diff-9433ab33e8bbf1048734205a3a1141ed
  https://github.com/ceph/ceph/commit/bcf0f4df2db8b51c58e5ca4d411d05e2a4d081ab#diff-9433ab33e8bbf1048734205a3a1141ed
  https://github.com/ceph/ceph/commit/6dc95544512362c202535139c323717ec867e20b#diff-9433ab33e8bbf1048734205a3a1141ed

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