I don't have any reproducible code but just trying to see any possibilities why happened. it was originally reported at https://bugzilla.redhat.com/show_bug.cgi?id=768580

The backtrace says:

+ Trace 231417

It was segfault there. content_type should be came from g_content_type_guess() in get_content_type() in glocalfileinfo.c.

the code in question is this:

  /* Got an extension match, and no conflicts. This is it. */
  if (n_name_mimetypes == 1)
    {
      G_UNLOCK (gio_xdgmime);
      return g_strdup (name_mimetypes[0]);
    }

name_mimetypes might be broken after Mutex is unlocked if another thread enters into it. shouldn't it be:

  /* Got an extension match, and no conflicts. This is it. */
  if (n_name_mimetypes == 1)
    {
      gchar *r = g_strdup (name_mimetypes[0]);
      G_UNLOCK (gio_xdgmime);
      return r;
    }

or something like that?