I had the same GTK_IS_TREE_MODEL message in 2.6 (i don't remember 
gimp_wire_read being part of my problem)
in 2.8 I had "gimp-2.8 crashed with SIGSEGV in completion_match_func"
both were immediately after Save As (2.6) or Export As (2.8) a PNG input file 
as a PNG (with a new name)

It seems that my issue may have been related to my Xauthority system.
For some reason, my login screen had been replaced with gdm and lightdm,
although installed, was not default.  Reinstalling lightdm and
reconfiguring it while wiping out my .Xauthority file seems to have
cured my woes.  Now 2.8 works like a charm.

Before I cleared out my /home/username/.Xauthority I had some problems
logging in as my default user, so you may want to have a spare account
to log into.

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https://bugs.launchpad.net/bugs/1048657

Title:
  Ubuntu 12.04 / Gimp - Consistent crash after saving file

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