[Bug 1797324] Re: Software Updater show empty panels, stuck in ProblemResolver.resolve of apt_pkg.cpython-36m-x86_64-linux-gnu.so

Thu Oct 11 09:49:59 UTC 2018

In straces everything seems to spin on:
python3    3736         paelzer    3u     unix 0xffff8fe4a2ba5000      0t0   2092674 type=STREAM
But that might just be GTK refreshs or such.
Yep that is only
u_str             ESTAB               0                    0                                                                          @/tmp/.X11-unix/X0 2091383                                         * 2092674

I'd need to see how to debug the actual resolve call.
PkgProblemResolverResolve of python-apt-1.7.0~rc1/python/depcache.cc is the implementation of this.
So fra trying to py-* in gdb's python support didn't grant me a lot useful things :-/

While still hanging in that resolve call threads look like this:

  Id   Target Id         Frame 
* 1    Thread 0x7feada74a740 (LWP 3736) "python3" 0x00007feada28dbf9 in __GI___poll (fds=0xf2e670, nfds=5, timeout=-1)
    at ../sysdeps/unix/sysv/linux/poll.c:29
  2    Thread 0x7feac9396700 (LWP 3737) "dconf worker" 0x00007feada28dbf9 in __GI___poll (fds=0x1105250, nfds=1, timeout=-1)
    at ../sysdeps/unix/sysv/linux/poll.c:29
  3    Thread 0x7feac8b95700 (LWP 3738) "gmain" 0x00007feada28dbf9 in __GI___poll (fds=0x7feac4006880, nfds=2, timeout=-1)
    at ../sysdeps/unix/sysv/linux/poll.c:29
  4    Thread 0x7feac3fff700 (LWP 3739) "gdbus" 0x00007feada28dbf9 in __GI___poll (fds=0x7feac4021b30, nfds=3, timeout=-1)
    at ../sysdeps/unix/sysv/linux/poll.c:29

Thread 3+4 are of GTK and seem not interesting.
Thread 1 is pythin, but it seems to spin in Gtk.main()

(gdb) py-bt-full 
#11 Frame 0xb6bc78, for file /usr/bin/update-manager, line 118, in <module> ()
    Gtk.main()

(gdb) py-list 
 113      settings.set_int64("launch-time", int(time.time()))
 114      init_proxy(settings)
 115    
 116      app = UpdateManager(data_dir, options)
 117      app.start_update()
>118      Gtk.main()

That is not where the resolver is stuck.
Which leaves Thread 2
  2    Thread 0x7feac9396700 (LWP 3737) "dconf worker" 0x00007feada28dbf9 in __GI___poll (fds=0x1105250, nfds=1, timeout=-1)
    at ../sysdeps/unix/sysv/linux/poll.c:29

But I'm not sure if this is the right thread, it doesn't seem to by
python more like Gnome-Settings related.

I'm not an cpython debug expert at all, but would want to know what to
look further before the situation resolves and I can't check it anymore.

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https://bugs.launchpad.net/bugs/1797324

Title:
  Software Updater show empty panels, stuck in ProblemResolver.resolve
  of apt_pkg.cpython-36m-x86_64-linux-gnu.so

Status in python-apt package in Ubuntu:
  New
Status in update-manager package in Ubuntu:
  New

Bug description:
  I just happened to see that Software Updater popped up with an actually empty window:
  1. nothing in "install or remove"
  2. obviously no details for changes/descriptions

  But at the same time it says "26.3 MB will be downloaded"
  I'll attach a screenshot of that to show what I mean.

  At the same time there are upgradable packages:
  $ apt list --upgradable
  Listing... Done
  apturl/bionic-updates 0.5.2ubuntu14.2 amd64 [upgradable from: 0.5.2ubuntu14]
  apturl-common/bionic-updates 0.5.2ubuntu14.2 amd64 [upgradable from: 0.5.2ubuntu14]
  flashplugin-installer/bionic-updates,bionic-security 31.0.0.122ubuntu0.18.04.1 amd64 [upgradable from: 31.0.0.108ubuntu0.18.04.1]
  gir1.2-javascriptcoregtk-4.0/bionic-updates,bionic-security 2.22.2-0ubuntu0.18.04.2 amd64 [upgradable from: 2.22.2-0ubuntu0.18.04.1]
  [...]

  And that matches the 26.3MB
  $ sudo apt upgrade
  [...]
  22 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
  Need to get 26,3 MB of archives.

  I can restart it to get the same symptom, done in console one indicator of a problem is:
  $ /usr/bin/python3 /usr/bin/update-manager --no-update --no-focus-on-map
  Failed to connect to https://changelogs.ubuntu.com/meta-release-lts. Check your Internet connection or proxy settings

  Also https://changelogs.ubuntu.com/meta-release-lts is reachable for
  me.

  But even if it would be not reachable, why then "26.3MB will be
  downloaded" - it seems to know some things?

  I'd either expect a user visible error (UI) or listing the packages apt knows about to upgrade.
  But not "nothing"

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: update-manager 1:18.04.11.5
  ProcVersionSignature: Ubuntu 4.15.0-36.39-generic 4.15.18
  Uname: Linux 4.15.0-36-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.9-0ubuntu7.4
  Aptdaemon:

  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Oct 11 09:36:19 2018
  ExecutablePath: /usr/bin/update-manager
  GsettingsChanges:
   b'com.ubuntu.update-manager' b'show-details' b'true'
   b'com.ubuntu.update-manager' b'window-height' b'625'
   b'com.ubuntu.update-manager' b'first-run' b'false'
   b'com.ubuntu.update-manager' b'window-width' b'645'
   b'com.ubuntu.update-manager' b'launch-time' b'int64 1539243337'
  InstallationDate: Installed on 2016-02-19 (964 days ago)
  InstallationMedia: Kubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  InterpreterPath: /usr/bin/python3.6
  PackageArchitecture: all
  Python3Details: /usr/bin/python3.6, Python 3.6.6, python3-minimal, 3.6.5-3ubuntu1
  PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
  SourcePackage: update-manager
  UpgradeStatus: Upgraded to bionic on 2018-05-03 (160 days ago)

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