Details
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Bug
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Status: Closed (View Workflow)
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Major
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Resolution: Fixed
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10.5
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None
Description
http://buildbot.askmonty.org/buildbot/builders/kvm-fulltest/builds/24098/steps/mtr_nm/logs/stdio
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10.5 ad5edf3c1582223a17abdcb6534cd7345767f4c8 |
multi_source.multi_source_slave_alias_replica w4 [ fail ]
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Test ended at 2020-06-14 04:47:07
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CURRENT_TEST: multi_source.multi_source_slave_alias_replica
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--- /mnt/buildbot/build/mariadb-10.5.4/mysql-test/suite/multi_source/multi_source_slave_alias_replica.result 2020-06-14 03:29:15.000000000 -0400
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+++ /mnt/buildbot/build/mariadb-10.5.4/mysql-test/suite/multi_source/multi_source_slave_alias_replica.reject 2020-06-14 04:47:07.603552059 -0400
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@@ -105,7 +105,7 @@
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Last_Error
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Skip_Counter 0
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Exec_Master_Log_Pos <read_master_log_pos>
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-Relay_Log_Space <relay_log_space1>
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+Relay_Log_Space 917
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Until_Condition None
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Until_Log_File
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Until_Log_Pos 0
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mysqltest: Result length mismatch
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Attachments
Issue Links
- duplicates
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- Closed
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Activity
| Field | Original Value | New Value |
|---|---|---|
| Assignee | Andrei Elkin [ elkin ] | Sujatha Sivakumar [ sujatha.sivakumar ] |
| Fix Version/s | 10.5.9 [ 25109 ] | |
| Fix Version/s | 10.5 [ 23123 ] | |
| Resolution | Fixed [ 1 ] | |
| Status | Open [ 1 ] | Closed [ 6 ] |
| Workflow | MariaDB v3 [ 110247 ] | MariaDB v4 [ 157991 ] |
This issue is duplicate of
MDEV-4633Writes to 'rli->log_space_total' needs to be synchronized. All modifications to 'rli->log_space_total' should be performed by holding 'rli->log_space_lock'. But IO thread doesn't acquire this mutex while writing events to relay log.
Hence there is a race condition between SQL THREAD and IO THREAD, when both try to modify the same variable. SQL_THREAD is trying to decrement 'rli->log_space_total' in 'purge_first_log' and IO_THREAD is trying to increment the 'rli->log_space_total' in 'queue_event' simultaneously . Hence test occasionally fails with result mismatch.