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Reading symbols from /usr/local/bin/etr...done.
(gdb) run
Starting program: /usr/local/bin/etr
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".

----------- Extreme Tux Racer 0.6.0 ----------------
----------- (C) 2010-2013 Extreme Tuxracer Team  --------

[New Thread 0xb6c93b40 (LWP 15673)]
No function available for obtaining GL proc addresses
[New Thread 0xaebd4b40 (LWP 15679)]
[Thread 0xaebd4b40 (LWP 15679) exited]
[New Thread 0xaebd4b40 (LWP 15680)]
[New Thread 0xb3090b40 (LWP 15681)]
[New Thread 0xaceffb40 (LWP 15682)]

Program received signal SIGSEGV, Segmentation fault.
CControl::CheckTreeCollisions (this=this@entry=0x8bc0fb8, pos=..., tree_loc=tree_loc@entry=0xbffff1f8, tree_diam=tree_diam@entry=0xbffff1f0) at physics.cpp:128
warning: Source file is more recent than executable.
128         size_t tree_type = trees[0].tree_type;
(gdb) backtrace
#0  CControl::CheckTreeCollisions (this=this@entry=0x8bc0fb8, pos=..., tree_loc=tree_loc@entry=0xbffff1f8, tree_diam=tree_diam@entry=0xbffff1f0)
    at physics.cpp:128
#1  0x0808ed70 in CControl::AdjustTreeCollision (this=0x8bc0fb8, pos=..., vel=vel@entry=0xbffff380) at physics.cpp:179
#2  0x08090d4d in CControl::SolveOdeSystem (this=this@entry=0x8bc0fb8, timestep=timestep@entry=0,0050001144409179688) at physics.cpp:627
#3  0x0809132c in CControl::UpdatePlayerPos (this=this@entry=0x8bc0fb8, timestep=timestep@entry=0,0050001144409179688) at physics.cpp:670
#4  0x080986ad in CRacing::Loop (this=0x80cfff0 <Racing>, time_step=0,0050001144409179688) at racing.cpp:320
#5  0x080a3158 in State::Manager::CallLoopFunction (this=this@entry=0x80d0268 <State::manager>) at states.cpp:130
#6  0x080a31af in State::Manager::Run (this=0x80d0268 <State::manager>, entranceState=...) at states.cpp:40
#7  0x0804dfbe in main (argc=1, argv=0xbffff654) at main.cpp:98