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

[Guido Serra]

$ file sublime_text 
sublime_text: ELF 64-bit LSB  executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.15, BuildID[sha1]=17ad7e4cfbc3c3c7919f99584a922b7c8ceea690, stripped

$ ldd sublime_text
	linux-vdso.so.1 =>  (0x00007fff3c2d2000)
	libgobject-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 (0x00007f44e654f000)
	librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f44e6347000)
	libglib-2.0.so.0 => /lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007f44e603e000)
	libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f44e5e20000)
	libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f44e5c1c000)
	libutil.so.1 => /lib/x86_64-linux-gnu/libutil.so.1 (0x00007f44e5a18000)
	libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 (0x00007f44e56e3000)
	libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f44e53df000)
	libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f44e50d8000)
	libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f44e4ec2000)
	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f44e4afc000)
	libffi.so.6 => /usr/lib/x86_64-linux-gnu/libffi.so.6 (0x00007f44e48f3000)
	libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007f44e46b5000)
	/lib64/ld-linux-x86-64.so.2 (0x00007f44e67c5000)
	libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f44e4495000)
	libXau.so.6 => /usr/lib/x86_64-linux-gnu/libXau.so.6 (0x00007f44e4291000)
	libXdmcp.so.6 => /usr/lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f44e408b000)

$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 14.04 LTS
Release:	14.04
Codename:	trusty

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https://bugs.launchpad.net/bugs/1313042

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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