UI Demo sometimes crashes in display_cb_conn

[Jiri Svoboda]

Occasionally UI Demo can crash with a stack trace like:

Kill message: Page fault: 0x00000028.
[/srv/taskmon(16)] taskmon: Task 71 fault in thread 0x84d83c48.
[/srv/taskmon(16)] taskmon: Executing /app/taskdump -t 71
[/app/taskdump(72)] Task Dump Utility
[/app/taskdump(72)] Dumping task '/app/uidemo' (task ID 71).
[/app/taskdump(72)] Loaded symbol table from /app/uidemo
[/app/taskdump(72)] Threads:
[/app/taskdump(72)]  [1] hash: 0x84d83c48
[/app/taskdump(72)] Thread 0x84d83c48: PC = 0x7015e131 (_end+1745828365). FP = 0x08173e28
[/app/taskdump(72)]   0x08173e28: 0x7015e131 (_end+1745828365)
[/app/taskdump(72)]   0x08173e48: 0x7015e229 (_end+1745828613)
[/app/taskdump(72)]   0x08173e68: 0x08059729 (ui_unlock+20)
[/app/taskdump(72)]   0x08173e98: 0x0805b6b4 (dwnd_pos_event+87)
[/app/taskdump(72)]   0x08173ee8: 0x0806096e (display_ev_pending+351)
[/app/taskdump(72)]   0x08173f48: 0x08060a6e (display_cb_conn+95)
[/app/taskdump(72)]   0x08173fc8: 0x7016476e (_end+1745854538)
[/app/taskdump(72)]   0x08173ff8: 0x7015c16c (_end+1745820232)
[/app/taskdump(72)] Address space areas:

(this is compiled with -O0). This would typically happen when a menu entry is selected.