Memory error during "new Gtk.RGBA"

[ghost]

When I run the code below, I get an error about 70000 iterations.

const GNode = require('node-gtk')
const Gdk = GNode.require('Gdk', '3.0')

let i = 0;
for(let i = 0; ; i++) {
    console.log(i)
    new Gdk.RGBA({red: 255/255, green: 235/255, blue: 51/255, alpha: 1})
}

Output 1:
....
76352
76353
76354
76355
76356
76357
Segmentation fault
$

Output 2:
....
71441
71442
71443
71444
71445
71446
71447
71448

MEMORY-ERROR: [16117]: GSlice: assertion failed: sinfo->n_allocated > 0
Aborted
$

[romgrk]

Thanks for the report, I had already seen a few of these errors but wasn't sure where they were coming from. I'll investigate what's going on.

[ghost]

https://github.com/romgrk/node-gtk/issues/213

The error does not occur as a result of trying "G_SLICE=always-malloc", the solution in the above article.

[romgrk]

Got it. We can probably skip the issue by using malloc directly rather than g_slice_alloc.

[romgrk]

Update on this, it seems that we had already migrated away from g_slice_alloc to malloc.

node-gtk/src/boxed.cc

Line 186 in c3dc55d

void *boxedCopy = malloc(size);

This is bad news because it means the bug is upstream. After some debugging, it appears that GLib's slice allocator is choking at various points in this method, usually when handling the SlabInfo struct:

https://github.com/GNOME/glib/blob/c0b339372cf3cf29cc8fee212a2debc41ea93cd2/glib/gslice.c#L1386

Here is one place where it aborts:

https://github.com/GNOME/glib/blob/c0b339372cf3cf29cc8fee212a2debc41ea93cd2/glib/gslice.c#L1398

I'll see if I can get some feedback from GLib or I'll open an issue with them soon.