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

[Presskopp]

How to Reproduce

While doing a GET operation on /report/21, Trac issued an internal error.

(please provide additional details here)

Request parameters:

{'id': u'21'}

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/local/lib/python2.7/dist-packages/Trac-1.0.1-py2.7.egg/trac/web/main.py", line 497, in _dispatch_request
    dispatcher.dispatch(req)
  File "/usr/local/lib/python2.7/dist-packages/Trac-1.0.1-py2.7.egg/trac/web/main.py", line 234, in dispatch
    req.send(output, content_type or 'text/html')
  File "/usr/local/lib/python2.7/dist-packages/Trac-1.0.1-py2.7.egg/trac/web/api.py", line 490, in send
    self.send_response(status)
  File "/usr/local/lib/python2.7/dist-packages/Trac-1.0.1-py2.7.egg/trac/web/main.py", line 79, in send_response
    self.session.save()
  File "/usr/local/lib/python2.7/dist-packages/Trac-1.0.1-py2.7.egg/trac/web/session.py", line 183, in save
    """, (mintime,))
  File "/usr/local/lib/python2.7/dist-packages/Trac-1.0.1-py2.7.egg/trac/db/util.py", line 121, in execute
    cursor.execute(query, params)
  File "/usr/local/lib/python2.7/dist-packages/Trac-1.0.1-py2.7.egg/trac/db/util.py", line 65, in execute
    return self.cursor.execute(sql_escape_percent(sql), args)
  File "/usr/lib/python2.7/dist-packages/MySQLdb/cursors.py", line 174, in execute
    self.errorhandler(self, exc, value)
  File "/usr/lib/python2.7/dist-packages/MySQLdb/connections.py", line 36, in defaulterrorhandler
    raise errorclass, errorvalue
OperationalError: (1213, 'Deadlock found when trying to get lock; try restarting transaction')

[ocean90]

There is no need to create tickets for such reports. It happens sometimes and should work after an reload again.

[Presskopp]

Ok, I had no clue, just followed the instruction on the screen :)