Segfault with async methods

[rcoup]

The following reliably segfaults within 10 iterations under Linux, Node v0.10.24, GEOS 3.3.3.

Using .intersects() synchronously doesn't appear to segfault...

var geos = require('../src');

var WKT1 = "MULTIPOLYGON (((-20037508 -307339, -12022505 -307339, -12022505 -7114301, -15760404 -7114301, -15760404 -7792636, -15779537 -7827998, -17263217 -7827998, -17263217 -14879925, -20037508 -14879925, -20037508 -307339)), ((15807367 -3245709, 17506729 -3245709, 17506729 -2487462, 17525862 -2466868, 18167688 -2466868, 18167688 -307339, 20037508 -307339, 20037508 -8411006, 18470338 -8411006, 18470338 -9891468, 19508740 -9891468, 19527873 -9938767, 19527873 -14879925, 18299880 -14879925, 18299880 -12026586, 17922438 -12026586, 17903304 -11962397, 17903304 -9986389, 17790246 -9986389, 17771113 -9938767, 17771113 -8411006, 17525862 -8411006, 17506729 -8372781, 17506729 -7114301, 15807367 -7114301, 15807367 -3245709)))";
var WKT2 = "POLYGON ((11271098 626172, 11271098 1252344, 11897270 1252344, 11897270 626172, 11271098 626172))";

var geom = (new geos.WKTReader()).read(WKT1);

var i=0;
function x() {
  var geom2 = (new geos.WKTReader()).read(WKT2);

  console.log(i, "calling");
  geom.intersects(geom2, function(err, intersects) {
    console.log(i, "callback", intersects);
    i++;
    x(i);
  });
}
x();

GDB backtrace:

Program received signal SIGSEGV, Segmentation fault.
0xb7ce9926 in Geometry::_ref (this=0x87dee78) at ../src/cpp/geometry.hpp:164
warning: Source file is more recent than executable.
164     static Handle<Value> New(geos::geom::Geometry* geometry);
(gdb) bt
#0  0xb7ce9926 in Geometry::_ref (this=0x87dee78) at ../src/cpp/geometry.hpp:164
#1  0xb7ce6187 in Geometry::Intersects (args=...) at ../src/cpp/geometry.cpp:166
#2  0x0821bb25 in ?? ()
#3  0x3da0a236 in ?? ()
#4  0x3da5a630 in ?? ()
#5  0x3da536bd in ?? ()
#6  0x3da141a5 in ?? ()
#7  0x3da53017 in ?? ()
#8  0x3da4f119 in ?? ()
#9  0x3da4c0bf in ?? ()
#10 0x3da3f337 in ?? ()
#11 0x3da3ee93 in ?? ()
#12 0x3da298f6 in ?? ()
#13 0x3da2910b in ?? ()
#14 0x3da0fe19 in ?? ()
#15 0x3da0a0aa in ?? ()
#16 0x08247b7e in ?? ()
#17 0x082482dd in v8::internal::Execution::Call(v8::internal::Handle<v8::internal::Object>, v8::internal::Handle<v8::internal::Object>, int, v8::internal::Handle<v8::internal::Object>*, bool*, bool) ()
#18 0x081e9da2 in v8::Function::Call(v8::Handle<v8::Object>, int, v8::Handle<v8::Value>*) ()
#19 0x084982c3 in node::Load(v8::Handle<v8::Object>) ()
#20 0x08498488 in node::Start(int, char**) ()
#21 0x084b0a5b in main ()

[kashif]

Thanks @rcoup I will have a look at it. Report back soon!

[kashif]

Ok under OSX, node v0.10.30 and geos 3.4.2 it does not crash:

...
20446 'calling'
20446 'callback' false
20447 'calling'
20447 'callback' false
20448 'calling'
20448 'callback' false
20449 'calling'
20449 'callback' false
20450 'calling'
20450 'callback' false
20451 'calling'
20451 'callback' false
^C

[rcoup]

Interesting. Will see if I can reproduce with Geos 3.4.2 or Node 0.10.30.