Howto reproduce: after enabling userstats and waiting for a while (on a busy server it might not take that long ;)) several counters run to the 32bit counter maximum:
mysql> SELECT ... FROM INFORMATION_SCHEMA.USER_STATISTICS WHERE (...)\G
*************************** 1. row ***************************
BYTES_RECEIVED: 2147483647
BYTES_SENT: 2147483647
TABLE_ROWS_READ: 2147483647
This issue still exists in 5.5.18.
Howto reproduce: after enabling userstats and waiting for a while (on a busy server it might not take that long ;)) several counters run to the 32bit counter maximum:
mysql> SELECT ... FROM INFORMATION_ SCHEMA. USER_STATISTICS WHERE (...)\G ******* ******* ****** 1. row ******* ******* ******* ******
*******
BYTES_RECEIVED: 2147483647
BYTES_SENT: 2147483647
TABLE_ROWS_READ: 2147483647
etc.