Hi
i digged a little more this weird bug :
In attachment you'll find
- a simple patch that fix this (or more probably a workaround)
- the backtrack from gdb (on latest svn)
(game map is bounded by (0,0) < (x,y) < (100,100) )
I just don't understand why this bug does not happen all the time,
and stayed hidden for so long (it appears in a very stable part of
the code, untouched for years)
I'll try to have a deeper understanding later.
Cheers
Alain
Index: src/lincity-ng/GameView.cpp
===================================================================
--- src/lincity-ng/GameView.cpp (révision 1604)
+++ src/lincity-ng/GameView.cpp (copie de travail)
@@ -1777,6 +1777,9 @@
int GameView::bulldozeCost( MapPoint tile ){
int group;
int prize = 0;
+ if ( (tile.x < 0) || (tile.x >= WORLD_SIDE_LEN) || (tile.y < 0) || (tile.y >= WORLD_SIDE_LEN) )
+ return 0;
+
if (MP_TYPE( tile.x, tile.y) == CST_USED)
group = MP_GROUP( MP_INFO(tile.x,tile.y).int_1,
MP_INFO(tile.x,tile.y).int_2 );
Program received signal SIGSEGV, Segmentation fault.
0x0000000000431502 in GameView::bulldozeCost (this=0x9993e0, tile=...) at
src/lincity-ng/GameView.cpp:1780
1780 if (MP_TYPE( tile.x, tile.y) == CST_USED)
(gdb) bt
#0 0x0000000000431502 in GameView::bulldozeCost (this=0x9993e0, tile=...) at
src/lincity-ng/GameView.cpp:1780
#1 0x0000000000430b7a in GameView::draw (this=0x9993e0, painter=...) at
src/lincity-ng/GameView.cpp:1683
#2 0x000000000046c6fa in Component::drawChild (this=0x9ad650, child=...,
painter=...) at src/gui/Component.cpp:66
#3 0x000000000046c7b9 in Component::draw (this=0x9ad650, painter=...) at
src/gui/Component.cpp:81
#4 0x0000000000480c83 in Desktop::draw (this=0x9ad650, painter=...) at
src/gui/Desktop.cpp:108
#5 0x0000000000434020 in Game::run (this=0x884d00) at
src/lincity-ng/Game.cpp:238
#6 0x000000000040b2d1 in mainLoop () at src/lincity-ng/main.cpp:409
#7 0x000000000040bf1d in main (argc=1, argv=0x7fffffffe588) at
src/lincity-ng/main.cpp:557
(gdb) p tile.x
$1 = -102
(gdb) p tile.y
$2 = -36
(gdb) p MP_TYPE(-102,-36)
Cannot access memory at address 0x70f568
