Public bug reported:

Since upgrading to Ubuntu 16.04, LibreOffice (1:5.1.1-0ubuntu3) hangs
with the logo is displayed.  If I launch LibreOffice with a document
argument then it actually does open, and I can see the content of the
document, before it hangs.  Messages printed to the console don't seem
to be helpful:

** (soffice:23839): WARNING **: Couldn't connect to accessibility bus: Failed 
to connect to socket /tmp/dbus-2dm4QTMT9Q: Connection refused
(soffice:23839): Gdk-WARNING **: gdk_window_set_icon_list: icons too large
(soffice:23839): Gdk-WARNING **: gdk_window_set_icon_list: icons too large

I've tried running it with both SAL_NO_XINITTHREADS=true and
SAL_NOOPENGL=true but it made no difference.  I'm not quite sure how to
isolate what it is actually hanging on.  If I run libreoffice with
--backtrace, I'm not able to interrupt gdb once it's hung to actually
get a backtrace.  I've attached the output of libreoffice --strace.  You
can see the section near the end where it is hung:

24038 14:05:16.708771 futex(0x7f9cf7b006e0, FUTEX_WAKE_PRIVATE, 1) = 0
24038 14:05:16.708805 futex(0x7f9cf7b0094c, 
FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 5, {1459969526, 708762000}, 
ffffffff <unfinished ...>
24045 14:05:16.792103 <... futex resumed> ) = -1 ETIMEDOUT (Connection timed 
out)

This just repeats indefinitely.  After that is what happens when I
manually kill (ctrl-c in this case) the process.

Update: I removed my ~/.config/libreoffice directory, and it started
right up.  Must be something in the upgrade process causing this.  I
still have the old config directory if we want to debug this further.

** Affects: libreoffice (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "strace.log"
   https://bugs.launchpad.net/bugs/1567034/+attachment/4626435/+files/strace.log

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https://bugs.launchpad.net/bugs/1567034

Title:
  LibreOffice 5.1 hangs on startup

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