Percona Server moved to https://jira.percona.com/projects/PS

audit_log plugin contention on libc TZ conversion

  1. Series 5.7
  2. Bug #1612650
Bug #1612650 reported by Laurynas Biveinis
8
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Percona Server moved to https://jira.percona.com/projects/PS
Status tracked in 5.7
5.5
Won't Fix
Wishlist
Unassigned
5.6
Triaged
Wishlist
Unassigned
5.7
Triaged
Wishlist
Unassigned

Bug Description

PMP on a server with audit_log enabled shows the following aggregated stacktrace:

113 __lll_lock_wait_private(libc.so.6),__tz_convert(libc.so.6),audit_log_general_record(audit_log.so),audit_log_notify(audit_log.so),general_class_handler,mysql_audit_notify,dispatch_command,do_handle_one_connection,handle_one_connection,pfs_spawn_thread,start_thread(libpthread.so.0),clone(libc.so.6)

This is caused by UTC timestamp printing in make_timestamp function, the sequence of libc calls time(NULL) -> gmtime_r -> strftime.

Laurynas Biveinis (laurynas-biveinis)
tags: added: audit performance
Revision history for this message
Sergei Glushchenko (sergei.glushchenko) wrote :

Related glibc bug report:
https://sourceware.org/bugzilla/show_bug.cgi?id=16145

Revision history for this message
Shahriyar Rzayev (rzayev-sehriyar) wrote :

Percona now uses JIRA for bug reports so this bug report is migrated to: https://jira.percona.com/browse/PS-2481

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