I get this log many times in all odoo versions. is it postgres boundry or odoo code issue. I get this issue in default odoo also.

Please Help if any one have idea.

File "/opt/odoo-9.0/Internal-Odoo/openerp/api.py", line 250, in wrapper return old_api(self, *args, **kwargs) File "/opt/odoo-9.0/Internal-Odoo/openerp/addons/base/ir/ir_qweb.py", line 254, in render return self.render_node(element, qwebcontext, generated_attributes=qwebcontext.pop('generated_attributes', '')) File "/opt/odoo-9.0/Internal-Odoo/openerp/addons/base/ir/ir_qweb.py", line 297, in render_node result = self.render_element(element, template_attributes, generated_attributes, qwebcontext) File "/opt/odoo-9.0/Internal-Odoo/openerp/addons/base/ir/ir_qweb.py", line 320, in render_element generated_attributes= name == "t" and generated_attributes or '')) File "/opt/odoo-9.0/Internal-Odoo/openerp/addons/base/ir/ir_qweb.py", line 295, in render_node result = self._render_tag[t_render](self, element, template_attributes, generated_attributes, qwebcontext) File "/opt/odoo-9.0/Internal-Odoo/openerp/addons/base/ir/ir_qweb.py", line 448, in render_tag_call d[0] = self.render_element(element, template_attributes, generated_attributes, d) File "/opt/odoo-9.0/Internal-Odoo/openerp/addons/base/ir/ir_qweb.py", line 320, in render_element generated_attributes= name == "t" and generated_attributes or '')) File "/opt/odoo-9.0/Internal-Odoo/openerp/addons/base/ir/ir_qweb.py", line 295, in render_node result = self._render_tag[t_render](self, element, template_attributes, generated_attributes, qwebcontext) File "/opt/odoo-9.0/Internal-Odoo/openerp/addons/base/ir/ir_qweb.py", line 489, in render_tag_set qwebcontext[template_attributes["set"]] = self.render_element(element, template_attributes, generated_attributes, qwebcontext) File "/opt/odoo-9.0/Internal-Odoo/openerp/addons/base/ir/ir_qweb.py", line 325, in render_element raise_qweb_exception(message="Could not render element %r" % element.tag, node=element, template=template) File "/opt/odoo-9.0/Internal-Odoo/openerp/addons/base/ir/ir_qweb.py", line 320, in render_element generated_attributes= name == "t" and generated_attributes or '')) File "/opt/odoo-9.0/Internal-Odoo/openerp/addons/base/ir/ir_qweb.py", line 295, in render_node result = self._render_tag[t_render](self, element, template_attributes, generated_attributes, qwebcontext) File "/opt/odoo-9.0/Internal-Odoo/openerp/addons/base/ir/ir_qweb.py", line 481, in render_tag_call_assets return bundle.to_html(css=css, js=js, debug=bool(qwebcontext.get('debug')), async=async, qwebcontext=qwebcontext) File "/opt/odoo-9.0/Internal-Odoo/openerp/addons/base/ir/ir_qweb.py", line 1195, in to_html css_attachments = self.css() File "/opt/odoo-9.0/Internal-Odoo/openerp/addons/base/ir/ir_qweb.py", line 1326, in css self.save_attachment("css", ' '.join(page), inc=idx) File "/opt/odoo-9.0/Internal-Odoo/openerp/addons/base/ir/ir_qweb.py", line 1285, in save_attachment self.clean_attachments(type) File "/opt/odoo-9.0/Internal-Odoo/openerp/addons/base/ir/ir_qweb.py", line 1252, in clean_attachments return ira.unlink(self.cr, openerp.SUPERUSER_ID, attachment_ids, context=self.context) File "/opt/odoo-9.0/Internal-Odoo/openerp/api.py", line 250, in wrapper return old_api(self, *args, **kwargs) File "/opt/odoo-9.0/Internal-Odoo/openerp/addons/base/ir/ir_attachment.py", line 416, in unlink res = super(ir_attachment, self).unlink(cr, uid, ids, context) File "/opt/odoo-9.0/Internal-Odoo/openerp/api.py", line 250, in wrapper return old_api(self, *args, **kwargs) File "/opt/odoo-9.0/Internal-Odoo/openerp/models.py", line 3677, in unlink 'where id IN %s', (sub_ids,)) File "/opt/odoo-9.0/Internal-Odoo/openerp/sql_db.py", line 141, in wrapper return f(self, *args, **kwargs) File "/opt/odoo-9.0/Internal-Odoo/openerp/sql_db.py", line 220, in execute res = self._obj.execute(query, params)QWebException: could not serialize access due to concurrent update