Program received signal SIGSEGV, Segmentation fault.
sphere_distance (s=0x8eda188, e=0x65726774) at lwgeodetic.c:758
758		double d_lon = e->lon - s->lon;

(gdb) bt
#0  sphere_distance (s=0x8eda188, e=0x65726774) at lwgeodetic.c:758
#1  0x0019ed04 in circ_node_min_distance (n1=0x8eda188, n2=0x65726774, 
    threshold=1.5696101447650194e-19, min_dist=0xbfc25098, max_dist=0xbfc25090, 
    closest1=0xbfc25080, closest2=0xbfc25070) at lwgeodetic_tree.c:458
#2  circ_tree_distance_tree_internal (n1=0x8eda188, n2=0x65726774, 
    threshold=1.5696101447650194e-19, min_dist=0xbfc25098, max_dist=0xbfc25090, 
    closest1=0xbfc25080, closest2=0xbfc25070) at lwgeodetic_tree.c:505
#3  0x0019f65c in circ_tree_distance_tree (n1=0x8eda188, n2=0x65726774, spheroid=0xbfc25158, 
    threshold=9.9999999999999998e-13) at lwgeodetic_tree.c:483
#4  0x00173c04 in geography_distance_cache (fcinfo=0x8ee0f84, g1=0x8ed64d8, g2=0x8ee5c30, 
    s=0xbfc25158, distance=0xbfc25130) at geography_measurement_trees.c:198
#5  0x00171cd8 in geography_distance (fcinfo=0x8ee0f84) at geography_measurement.c:147
#6  0x081b6ff8 in ExecMakeFunctionResultNoSets (fcache=0x8ee0f48, econtext=0x8ed8270, 
    isNull=0xbfc2528f "", isDone=0x0) at execQual.c:1890
#7  0x001200fb in exec_eval_simple_expr (estate=0xbfc2559c, expr=0x8ebbce8, isNull=0xbfc2528f "", 
    rettype=0xbfc25288) at pl_exec.c:4890
#8  exec_eval_expr (estate=0xbfc2559c, expr=0x8ebbce8, isNull=0xbfc2528f "", rettype=0xbfc25288)
    at pl_exec.c:4476
#9  0x00121ba6 in exec_assign_expr (estate=0xbfc2559c, target=0x8ed6328, expr=0x8ebbce8)
    at pl_exec.c:3675
#10 0x001236c2 in exec_stmt_assign (estate=<value optimized out>, stmts=<value optimized out>)
    at pl_exec.c:1397
#11 exec_stmt (estate=<value optimized out>, stmts=<value optimized out>) at pl_exec.c:1285
#12 exec_stmts (estate=<value optimized out>, stmts=<value optimized out>) at pl_exec.c:1248
#13 0x00123c62 in exec_stmt_fori (estate=<value optimized out>, stmts=<value optimized out>)
    at pl_exec.c:1797
#14 exec_stmt (estate=<value optimized out>, stmts=<value optimized out>) at pl_exec.c:1313
#15 exec_stmts (estate=<value optimized out>, stmts=<value optimized out>) at pl_exec.c:1248
#16 0x0012669a in exec_stmt_block (estate=0xbfc2559c, block=0x8ebbe78) at pl_exec.c:1186
#17 0x001270f3 in plpgsql_exec_function (func=0x8ea77f8, fcinfo=0x8ece27c) at pl_exec.c:324
#18 0x0011ac74 in plpgsql_call_handler (fcinfo=0x8ece27c) at pl_handler.c:122
#19 0x081b8500 in ExecMakeFunctionResult (fcache=0x8ece240, econtext=0x8ece648, 
    isNull=0xbfc2581f "\bH\236\340\b$", isDone=0x0) at execQual.c:1824
#20 0x081b9554 in ExecEvalExprSwitchContext (expression=0x8ece240, econtext=0x8ece648, 
    isNull=0xbfc2581f "\bH\236\340\b$", isDone=0x0) at execQual.c:4179
#21 0x08227807 in evaluate_expr (expr=<value optimized out>, result_type=23, result_typmod=-1, 
    result_collation=0) at clauses.c:4212
#22 0x08229869 in evaluate_function (funcid=798567, result_type=23, result_typmod=-1, 
    result_collid=0, input_collid=0, args=0xbfc25938, has_named_args=0 '\000', 
    allow_inline=1 '\001', context=0xbfc25afc) at clauses.c:3774
#23 simplify_function (funcid=798567, result_type=23, result_typmod=-1, result_collid=0, 
    input_collid=0, args=0xbfc25938, has_named_args=0 '\000', allow_inline=1 '\001', 
    context=0xbfc25afc) at clauses.c:3432
#24 0x08229cea in eval_const_expressions_mutator (node=0x8e8ea70, context=0xbfc25afc)
    at clauses.c:2191
#25 0x081e4371 in expression_tree_mutator (node=0x8e8ebd8, 
    mutator=0x8229a50 <eval_const_expressions_mutator>, context=0xbfc25afc) at nodeFuncs.c:2194
#26 0x08229b4d in eval_const_expressions_mutator (node=0x8e8ebd8, context=0xbfc25afc)
    at clauses.c:3101
#27 0x081e4a2e in expression_tree_mutator (node=0x8e8e9d0, 
    mutator=0x8229a50 <eval_const_expressions_mutator>, context=0xbfc25afc) at nodeFuncs.c:2442
#28 0x08229b4d in eval_const_expressions_mutator (node=0x8e8e9d0, context=0xbfc25afc)
    at clauses.c:3101
#29 0x0822b76d in eval_const_expressions (root=0x8e8ec78, node=0x8e8e9d0) at clauses.c:2074
#30 0x0821a3b3 in preprocess_expression (root=0x8e8ec78, expr=<value optimized out>, kind=1)
    at planner.c:632
#31 0x0821d2cf in subquery_planner (glob=0x8e8eab8, parse=0x8e8e948, parent_root=0x0, 
    hasRecursion=0 '\000', tuple_fraction=0, subroot=0xbfc25cac) at planner.c:422
#32 0x0821da64 in standard_planner (parse=0x8e8e948, cursorOptions=0, boundParams=0x0)
    at planner.c:202
#33 0x0827f621 in pg_plan_query (querytree=0x8e8e948, cursorOptions=0, boundParams=0x0)
    at postgres.c:725
#34 0x0827f6f3 in pg_plan_queries (querytrees=0x8e8ec60, cursorOptions=0, boundParams=0x0)
    at postgres.c:784
#35 0x08280171 in exec_simple_query (argc=2, argv=0x8e34b98, username=0x8e2d038 "em")
    at postgres.c:949
#36 PostgresMain (argc=2, argv=0x8e34b98, username=0x8e2d038 "em") at postgres.c:3968
#37 0x08241c90 in BackendRun () at postmaster.c:3611
#38 BackendStartup () at postmaster.c:3296
#39 ServerLoop () at postmaster.c:1460
#40 0x08242727 in PostmasterMain (argc=3, argv=0x8e09318) at postmaster.c:1121
#41 0x081e2858 in main (argc=3, argv=0x8e09318) at main.c:199