mikkl@faulpelz ~/work/ardour-3.9999/gtk2_ardour $ ./ardbg
GNU gdb (Gentoo 7.4.1 p1) 7.4.1
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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This GDB was configured as "x86_64-pc-linux-gnu".
For bug reporting instructions, please see:
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Reading symbols from /home/mikkl/work/ardour-3.9999/build/gtk2_ardour/ardour-3.0...done.
(gdb) run
Starting program: /home/mikkl/work/ardour-3.9999/build/gtk2_ardour/ardour-3.0 
warning: Could not load shared library symbols for linux-vdso.so.1.
Do you need "set solib-search-path" or "set sysroot"?
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Ardour3.0beta4a (built using 12954 and GCC version 4.6.3)
ardour: [INFO]: Loading default ui configuration file ./../gtk2_ardour/ardour3_ui_default.conf
Loading ui configuration file ./../build/gtk2_ardour/ardour3_ui_dark.rc
ardour: [INFO]: Ardour will be limited to 4096 open files
[New Thread 0x7fffe2a4b700 (LWP 10170)]
ardour: [INFO]: Loading system configuration file ./../build/ardour_system.rc
Loading user configuration file /home/mikkl/.config/ardour3/ardour.rc
Using SSE optimized routines
[New Thread 0x7fffe224a700 (LWP 10171)]
[New Thread 0x7fffe1a49700 (LWP 10172)]
[New Thread 0x7fffe1248700 (LWP 10173)]
[New Thread 0x7fffc7eb9700 (LWP 10174)]
[New Thread 0x7fffc76b8700 (LWP 10175)]
[New Thread 0x7fffc6eb7700 (LWP 10176)]
[New Thread 0x7fffc66b6700 (LWP 10177)]
[New Thread 0x7fffc5eb5700 (LWP 10178)]
[New Thread 0x7fffc56b4700 (LWP 10179)]
[New Thread 0x7fffe018e700 (LWP 10180)]
[New Thread 0x7fffe010d700 (LWP 10181)]
[Thread 0x7fffe010d700 (LWP 10181) exited]
[Thread 0x7fffe018e700 (LWP 10180) exited]
[Thread 0x7fffc56b4700 (LWP 10179) exited]
[Thread 0x7fffc66b6700 (LWP 10177) exited]
[Thread 0x7fffc6eb7700 (LWP 10176) exited]
[Thread 0x7fffc76b8700 (LWP 10175) exited]
[Thread 0x7fffc7eb9700 (LWP 10174) exited]
[New Thread 0x7fffc7eb9700 (LWP 10182)]
[Thread 0x7fffc7eb9700 (LWP 10182) exited]
[New Thread 0x7fffc56b4700 (LWP 10184)]
[New Thread 0x7fffc5633700 (LWP 10185)]
[Thread 0x7fffc5eb5700 (LWP 10178) exited]
[New Thread 0x7fffc5fbe700 (LWP 10188)]
[New Thread 0x7fffc5f3d700 (LWP 10189)]
[New Thread 0x7fffc40ca700 (LWP 10190)]
[New Thread 0x7fff96f83700 (LWP 10191)]
[New Thread 0x7fff96f01800 (LWP 10192)]
[New Thread 0x7fffc5eb5700 (LWP 10193)]
ardour-3.0: /usr/include/boost/smart_ptr/shared_ptr.hpp:424: T* boost::shared_ptr<T>::operator->() const [with T = ARDOUR::AudioFileSource]: Assertion `px != 0' failed.

Program received signal SIGABRT, Aborted.
0x00007fffec7f1b85 in raise () from /lib64/libc.so.6