OperationalError: (1213, 'Deadlock found when trying to get lock; try restarting transaction')

[Perry G]

How to Reproduce

While doing a GET operation on /timeline, Trac issued an internal error.

(please provide additional details here)

Request parameters:

{'wiki': u'off', 'changeset': u'on', 'daysback': u'7'}

User agent: #USER_AGENT#

System Information

System information not available

Enabled Plugins

Plugin information not available

Python Traceback

Traceback (most recent call last):
  File "/usr/lib/python2.4/site-packages/trac/web/main.py", line 513, in _dispatch_request
    dispatcher.dispatch(req)
  File "/usr/lib/python2.4/site-packages/trac/web/main.py", line 258, in dispatch
    req.session.save()
  File "/usr/lib/python2.4/site-packages/trac/web/session.py", line 88, in save
    @self.env.with_transaction()
  File "/usr/lib/python2.4/site-packages/trac/db/api.py", line 77, in transaction_wrapper
    fn(ldb)
  File "/usr/lib/python2.4/site-packages/trac/web/session.py", line 137, in delete_session_cookie
    cursor.execute("""
  File "/usr/lib/python2.4/site-packages/trac/db/util.py", line 65, in execute
    return self.cursor.execute(sql_escape_percent(sql), args)
  File "/usr/lib64/python2.4/site-packages/MySQL_python-1.2.4b4-py2.4-linux-x86_64.egg/MySQLdb/cursors.py", line 202, in execute
    self.errorhandler(self, exc, value)
  File "/usr/lib64/python2.4/site-packages/MySQL_python-1.2.4b4-py2.4-linux-x86_64.egg/MySQLdb/connections.py", line 36, in defaulterrorhandler
    raise errorclass, errorvalue
OperationalError: (1213, 'Deadlock found when trying to get lock; try restarting transaction')