Bug #91396 Sys Schema reports negative memory use by session
Submitted: 24 Jun 2018 23:47 Modified: 25 Jun 2018 5:00
Reporter: Peter Zaitsev Email Updates:
Status: Duplicate Impact on me:
Category:MySQL Server: Performance Schema Severity:S3 (Non-critical)
Version:8.0.11 OS:Linux
Assigned to: CPU Architecture:Any
Tags: sys_schema

[24 Jun 2018 23:47] Peter Zaitsev
running select * from sys.session  I observe many negative memory usage:

*************************** 128. row ***************************
                thd_id: 254
               conn_id: 214
                  user: root@localhost
                    db: tpcc
               command: Query
                 state: update
                  time: 0
     current_statement: INSERT INTO orders3            ... ES (3424,8,68,1773,NOW(),15,1)
     statement_latency: 14.53 ms
              progress: NULL
          lock_latency: 6.67 ms
         rows_examined: 0
             rows_sent: 0
         rows_affected: 0
            tmp_tables: 0
       tmp_disk_tables: 0
             full_scan: NO
        last_statement: NULL
last_statement_latency: NULL
        current_memory: -132145 bytes
             last_wait: NULL
     last_wait_latency: NULL
                source: NULL
           trx_latency: 22.15 ms
             trx_state: ACTIVE
        trx_autocommit: NO
                   pid: 3892
          program_name: NULL

How to repeat:
In this case I'm running sysbench_tpcc  but  I have seen it with other workloads too.
[25 Jun 2018 5:00] MySQL Verification Team
Hello Peter,

Thank you for the report and feedback.
This is already reported by our Shane Bug #80523, please see Bug #80523.
Marking as duplicate for now.