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  1. MariaDB Server
  2. MDEV-11738

Mariadb uses 100% of several of my 8 cpus doing nothing

    Details

    • Type: Bug
    • Status: Closed (View Workflow)
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 10.1.20
    • Fix Version/s: 10.1.23
    • Component/s: Encryption, Storage Engine - InnoDB, Storage Engine - XtraDB
    • Labels:
      None
    • Environment:
      Linux 4.8.0-32-generic #34-Ubuntu SMP Tue Dec 13 14:30:43 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

      Ubuntu 16.10
      7.5 GB memory. Core™ i7-4770T CPU @ 2.50GHz × 8. 64 bit.
      Intel® Haswell Desktop

    • Sprint:
      10.1.22

      Description

      I use mariadb purely for a local sql database (via LibreOffice Base). There are no other users.

      Periodically the mysql process (still called that) take 37% (sometimes more) of the total available cpu, even though I am not doing anything at all, and the local database is not being used. If I restart the service the usage drops to 0%. I have not found any specific trigger for this behaviour.

      mysql.txt attached is the result of 'show engine innodb status;'
      my.cnf is the configuration file. Note that I use encryption for some tables - the key is itself encrypted and held in a part of my user space which is itself encrypted (I had to allow the service to access this in the mysql.service file). I then only start the mariadb/mysql service when I decrypt that part of my user space, so that it can get the key it needs. All this works without trouble.
      The conf.d file mariadb.cnf only contain character set info.

        Attachments

        1. my.cnf
          5 kB
        2. mysql.txt
          6 kB

          Issue Links

          causes

          Bug - A problem which impairs or prevents the functions of the product. MDEV-12428 SIGSEGV in buf_page_decrypt_after_read() during DDL

          • Blocker - Blocks development and/or testing work, production could not run.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-12467 encryption.create_or_replace hangs during DROP TABLE

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-13639 Server crashes in prepare_inplace_alter_table_dict upon altering a table with discarded tablespace

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-19111 Unused field INFORMATION_SCHEMA.INNODB_TABLESPACES_SCRUBBING.ROTATING_OR_FLUSHING

          • Major - Major loss of function.
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-12602 InnoDB: Failing assertion: space->n_pending_ops == 0

          • Blocker - Blocks development and/or testing work, production could not run.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-15016 multiple page cleaner threads use a lot of CPU on idle server

          • Blocker - Blocks development and/or testing work, production could not run.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-11581 Mariadb starts innodb encryption threads when key has not changed or data scrubbing turned off

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-17757 MariaDB 10.1 encryption threads consume CPU 100%

          • Major - Major loss of function.
          • Open

          Bug - A problem which impairs or prevents the functions of the product. MDEV-11420 encryption.innodb_encryption-page-compression failed in buildbot

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-11222 encryption.encrypt_and_grep failed in buildbot on P8

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-11929 During delete: InnoDB: Assertion failure in thread 139757855127296 in file buf0buf.cc line 4803

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Closed

            Activity

              People

              • Assignee:
                jplindst Jan Lindström
                Reporter:
                pastim Tim Passingham
              • Votes:
                0 Vote for this issue
                Watchers:
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                Dates

                • Created:
                  Updated:
                  Resolved: