glib assertion failure after calling tree-view-columns

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This occurs during gc after calling tree-view-columns

Can be reproduced with testgtk.lisp by adding this=20
(print (tree-view-columns tree))
to the list example


GLib-GObject: g_object_unref: assertion `G_IS_OBJECT (object)' failed
   [Condition of type GLIB:CRITICAL-LOG-LEVEL]

Restarts:
  0: [ABORT-REQUEST] Abort handling SLIME request.
  1: [ABORT] Return to Top-Level.

Backtrace:
  0: (GLIB::LOG-HANDLER 268430975 268430971)
  1: ("call_into_lisp+#x8C [#x8054D3C] /home/srolls/cl/cmucl/bin/lisp")
  2: ("funcall3+#x29 [#x8054B4F] /home/srolls/cl/cmucl/bin/lisp")
  3: ("Foreign function call land")
  4: ("g_logv+#x1D0 [#xB7BF2563] /home/srolls/local/gtk/lib/libglib-2.0.s=
o")
  5: ("g_log+#x29 [#xB7BF27D3] /home/srolls/local/gtk/lib/libglib-2.0.so"=
)
  6: ("g_return_if_fail_warning+#x57 [#xB7BF28A3] /home/srolls/local/gtk/=
lib/libglib-2.0.so")
  7: ("g_object_unref+#x9D [#xB7B94453] /home/srolls/local/gtk/lib/libgob=
ject-2.0.so")
  8: (GLIB::%OBJECT-UNREF #.(SYSTEM:INT-SAP #x08250BB8))
  9: ("DEFUN FINALIZE-CORPSES" (#<Broken Weak Pointer {5958E357}> . #<Clo=
sure Over Function "DEFMETHOD INSTANCE-FINALIZER AROUND (PROXY)" {5958E36=
9}>))
 10: (DELETE-IF #<Function "DEFUN FINALIZE-CORPSES" {10570F69}> ((# . #) =
(# . #) (# . #) (# . #) (# . #) ...) :FROM-END NIL ...)
 11: (EXTENSIONS::FINALIZE-CORPSES)
 12: ((FLET #:G5 LISP::SUB-GC))
 13: (LISP::SUB-GC :VERBOSE-P T :FORCE-P T ...)
 14: (SWANK::EVAL-REGION "(gc)


      =20
---------------------------------
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This occurs during gc after calling tree-view-columns<br><br>Can be repro=
duced with testgtk.lisp by adding this <br>(print (tree-view-columns tree=
))<br>to the list example<br><br><br>GLib-GObject: g_object_unref: assert=
ion `G_IS_OBJECT (object)' failed<br>&nbsp;&nbsp; [Condition of type GLIB=
:CRITICAL-LOG-LEVEL]<br><br>Restarts:<br>&nbsp; 0: [ABORT-REQUEST] Abort =
handling SLIME request.<br>&nbsp; 1: [ABORT] Return to Top-Level.<br><br>=
Backtrace:<br>&nbsp; 0: (GLIB::LOG-HANDLER 268430975 268430971)<br>&nbsp;=
 1: ("call_into_lisp+#x8C [#x8054D3C] /home/srolls/cl/cmucl/bin/lisp")<br=
>&nbsp; 2: ("funcall3+#x29 [#x8054B4F] /home/srolls/cl/cmucl/bin/lisp")<b=
r>&nbsp; 3: ("Foreign function call land")<br>&nbsp; 4: ("g_logv+#x1D0 [#=
xB7BF2563] /home/srolls/local/gtk/lib/libglib-2.0.so")<br>&nbsp; 5: ("g_l=
og+#x29 [#xB7BF27D3] /home/srolls/local/gtk/lib/libglib-2.0.so")<br>&nbsp=
; 6: ("g_return_if_fail_warning+#x57 [#xB7BF28A3] /home/srolls/local/gtk/=
lib/libglib-2.0.so")<br>&nbsp; 7:
 ("g_object_unref+#x9D [#xB7B94453] /home/srolls/local/gtk/lib/libgobject=
-2.0.so")<br>&nbsp; 8: (GLIB::%OBJECT-UNREF #.(SYSTEM:INT-SAP #x08250BB8)=
)<br>&nbsp; 9: ("DEFUN FINALIZE-CORPSES" (#&lt;Broken Weak Pointer {5958E=
357}&gt; . #&lt;Closure Over Function "DEFMETHOD INSTANCE-FINALIZER AROUN=
D (PROXY)" {5958E369}&gt;))<br>&nbsp;10: (DELETE-IF #&lt;Function "DEFUN =
FINALIZE-CORPSES" {10570F69}&gt; ((# . #) (# . #) (# . #) (# . #) (# . #)=
 ...) :FROM-END NIL ...)<br>&nbsp;11: (EXTENSIONS::FINALIZE-CORPSES)<br>&=
nbsp;12: ((FLET #:G5 LISP::SUB-GC))<br>&nbsp;13: (LISP::SUB-GC :VERBOSE-P=
 T :FORCE-P T ...)<br>&nbsp;14: (SWANK::EVAL-REGION "(gc)<br><br><p>&#32;



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