[Bug 1313042] Re: console-kit-daemon related ssh session hang w/ Glib-CRITICAL warning

[Ariel Faigon]

The GLib-CRITICAL error applies to many applcations which call
g_source_remove() with garbage parameters.

libglib2 changed recently to check for this error, instead of silently
ignoring it, so the error started showing in multiple places.

The hang in consolekit happens  independently of the call to
g_source_remove() which is I suspect is simply a part of closing down
the session.

Also: turns out: ssh was just coincidental
I am now able to reproduce the hang _without the GLib error_ in a local konsole session too.

To try and reprodce (not always, only happens intermittently)
1) Upgrade to 14.04
2) Open a konsole window and create several tabs in it
3)  Run a command which is both CPU intensive on multiple cores, and generates output.  I was much more successful reproducing when the command takes more than a minute to run and generates several hundred lines of output.
4) When the command finishes the konsole window tab in which the command was run no longer accepts input

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Title:
  console-kit-daemon related ssh session hang w/ Glib-CRITICAL warning

Status in “consolekit” package in Ubuntu:
  Confirmed

Bug description:
  The day I upgraded from 13.10 to 14.04 some of my ssh sessions into
  the new system (server side is Ubuntu 14.04) started hanging.

  The symptom is: I run some command with a lot of output (say a few
  hundreds of lines) in an ssh session, and the second the command
  completes, and the shell displays a new  prompt, the shell stops
  responding to keyboard input.

  At  the exact time of the hang (to the second) I always see these 3
  warnings in syslog:

  Apr 21 18:15:25 xx console-kit-daemon[3357]: GLib-CRITICAL: Source ID 469 was not found when attempting to remove it
  Apr 21 18:15:25 xx console-kit-daemon[3357]: GLib-CRITICAL: Source ID 86 was not found when attempting to remove it
  Apr 21 18:15:25 xx console-kit-daemon[3357]: GLib-CRITICAL: Source ID 86 was not found when attempting to remove it

  The Source ID numbers vary, but the warnings always come in triplets
  at the time of the hang.   I was able to reproduce this about 10 times
  today.  Every time the session hangs, these warnings appear in the log
  and vice versa: every time they appear in the log, I have a hanged
  remote session.

  A quote from an upstream (bugzilla.gnome.org) comment:

  https://bugzilla.gnome.org/show_bug.cgi?id=721369

      GLib recently started throwing a warning when g_source_remove()
      is passed garbage (as per warning). Your applications have probably been broken
      for a while, and there's no telling what could actually have happened in the
      past when g_source_remove() would happily close any random source because the
      programmer got the wrong argument to g_source_remove().

  So based on this I'm opening a bug against  consolekit for bad calls
  to g_source_remove() which seem to be related to the ssh hang.

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