GNU gdb 6.6-debian
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This GDB was configured as "x86_64-linux-gnu"...
Using host libthread_db library "/lib/libthread_db.so.1".
Reading symbols from /usr/lib/libX11.so.6...done.
Loaded symbols for /usr/lib/libX11.so.6
Reading symbols from /usr/lib/libXext.so.6...done.
Loaded symbols for /usr/lib/libXext.so.6
Reading symbols from /usr/lib/liblua5.1.so.0...done.
Loaded symbols for /usr/lib/liblua5.1.so.0
Reading symbols from /lib/libdl.so.2...done.
Loaded symbols for /lib/libdl.so.2
Reading symbols from /lib/libm.so.6...done.
Loaded symbols for /lib/libm.so.6
Reading symbols from /lib/libc.so.6...done.
Loaded symbols for /lib/libc.so.6
Reading symbols from /usr/lib/libXau.so.6...done.
Loaded symbols for /usr/lib/libXau.so.6
Reading symbols from /usr/lib/libXdmcp.so.6...done.
Loaded symbols for /usr/lib/libXdmcp.so.6
Reading symbols from /lib/ld-linux-x86-64.so.2...done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
Reading symbols from /usr/lib/libXcursor.so.1...done.
Loaded symbols for /usr/lib/libXcursor.so.1
Reading symbols from /usr/lib/libXrender.so.1...done.
Loaded symbols for /usr/lib/libXrender.so.1
Reading symbols from /usr/lib/libXfixes.so.3...done.
Loaded symbols for /usr/lib/libXfixes.so.3
Reading symbols from /usr/lib/ion3/de.so...done.
Loaded symbols for /usr/lib/ion3/de.so
Reading symbols from /usr/lib/ion3/mod_query.so...done.
Loaded symbols for /usr/lib/ion3/mod_query.so
Reading symbols from /usr/lib/ion3/mod_menu.so...done.
Loaded symbols for /usr/lib/ion3/mod_menu.so
Reading symbols from /usr/lib/ion3/mod_tiling.so...done.
Loaded symbols for /usr/lib/ion3/mod_tiling.so
Reading symbols from /usr/lib/ion3/mod_statusbar.so...done.
Loaded symbols for /usr/lib/ion3/mod_statusbar.so
Reading symbols from /usr/lib/ion3/mod_sp.so...done.
Loaded symbols for /usr/lib/ion3/mod_sp.so
Core was generated by `ion3'.
Program terminated with signal 11, Segmentation fault.
#0  0x000000000042ebc7 in group_find_stacking (ws=0x682300, r=0x80)
    at group.c:1135
	in group.c
(gdb) bt
#0  0x000000000042ebc7 in group_find_stacking (ws=0x682300, r=0x80)
    at group.c:1135
#1  0x000000000042fccd in group_do_attach_final (ws=0x682300, reg=0x71d9f0, 
    param=0x7fffed5c9b50) at group.c:616
#2  0x000000000042136e in doit_new (mgr=0x682300, par=<value optimized out>, 
    fp=<value optimized out>, cont=0x42fca8 <group_do_attach_final>, 
    cont_param=0x7fffed5c9b50, fn=<value optimized out>, fn_param=0x0)
    at attach.c:37
#3  0x000000000042159a in region_attach_helper (mgr=0x682300, par=0x6a5db0, 
    fp=0x7fffed5c9af0, fn=0x42fca8 <group_do_attach_final>, 
    fn_param=0x7fffed5c9b50, data=<value optimized out>) at attach.c:148
#4  0x000000000042ef61 in group_do_attach (ws=0x682300, param=0x7fffed5c9b50, 
    data=0x7fffed5c9b80) at group.c:723
#5  0x00002ba7bfa8d429 in create_scratchws (parent=<value optimized out>, 
    fp=0x7fffed5c9c40, unused=<value optimized out>) at main.c:95
#6  0x000000000042135a in doit_new (mgr=0x6a5db0, par=0x80, fp=0x80, 
    cont=0x1ca0000027e, cont_param=0x0, fn=0x1, fn_param=0x0) at attach.c:32
#7  0x000000000042159a in region_attach_helper (mgr=0x6a5db0, par=0x6a5db0, 
    fp=0x7fffed5c9c40, fn=0x428fe8 <mplex_do_attach_final>, fn_param=0x745840, 
    data=<value optimized out>) at attach.c:148
#8  0x00000000004277c6 in mplex_do_attach_pholder (mplex=0x6a5db0, 
    ph=0x745840, data=0x7fffed5c9cb0) at mplex.c:1324
#9  0x0000000000427801 in mplex_do_attach (mplex=0x6a5db0, 
---Type <return> to continue, or q <return> to quit---
    param=<value optimized out>, data=0x7fffed5c9cb0) at mplex.c:1342
#10 0x0000000000427a19 in mplex_do_attach_new (mplex=0x80, param=0x80, 
    fn=<value optimized out>, fn_param=0x1ca0000027e) at mplex.c:1359
#11 0x00002ba7bfa8d170 in create (mplex=0x80, flags=<value optimized out>)
    at main.c:119
#12 0x00002ba7bfa8d1fd in check_and_create () at main.c:224
#13 0x0000000000435483 in marshall_v (fn=0x80, param=0x80) at hooks.c:275
#14 0x0000000000435503 in hook_call (hk=<value optimized out>, p=0x0, 
    m=0x43547b <marshall_v>, em=0x435634 <marshall_extl_v>) at hooks.c:355
#15 0x000000000041cb8f in ioncore_startup (display=0x0, 
    cfgfile=0x43e9bc "cfg_ion", stflags=<value optimized out>) at ioncore.c:593
#16 0x0000000000416fae in main (argc=<value optimized out>, 
    argv=<value optimized out>) at ion.c:225