[Bug 55473] Aisleriot crashes with scheme error "GC missed a reference"

[Dagfinn Ilmari Mannsåker]

Public bug reported:

Occasionally, when moving a stack of cards in Aisleriot (Freecell), the game crashes with the following scheme backtrace.
Backtrace:
In unknown file:
   ?: 0* [droppable? 8 #<freed cell 0xb6e6a1d0; GC missed a reference> 9]
In /usr/share/sol-games/freecell.scm:
 375: 1* (and (not (= start-slot end-slot)) (cond (# #) (# #) (# #) ...))
 376: 2  (cond (# #) (# #) (# #) ...)
In unknown file:
   ...
   ?: 3  [movable-to-field? 8 #<freed cell 0xb6e6a1d0; GC missed a reference> 9]
In /usr/share/sol-games/freecell.scm:
 216: 4  (and (field-sequence? card-list) (<= (length card-list) (* # #)) ...)
 216: 5* [field-sequence? #<freed cell 0xb6e6a1d0; GC missed a reference>]
 165: 6  (or (null? card-list) (null? (cdr card-list)) ...)
 166: 7* [null? ...
 166: 8*  [cdr #<freed cell 0xb6e6a1d0; GC missed a reference>]

** Affects: gnome-games (Ubuntu)
     Importance: Untriaged
         Status: Unconfirmed

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Aisleriot crashes with scheme error "GC missed a reference"
https://launchpad.net/bugs/55473