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The following intermittent result difference was observed immediately after MDEV-16678 was pushed to 10.5.
CURRENT_TEST: main.backup_interaction
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--- /usr/share/mysql/mysql-test/main/backup_interaction.result 2019-12-10 14:25:41.000000000 -0500
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+++ /dev/shm/var/4/log/backup_interaction.reject 2019-12-10 16:16:44.997159774 -0500
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@@ -105,6 +105,7 @@
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select lock_mode from information_schema.metadata_lock_info;
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lock_mode
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MDL_BACKUP_START
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+MDL_SHARED
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backup stage block_commit;
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commit;
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backup stage end;
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According to the buildbot cross-reference, this is the very first time the failure was observed. There were 2 failures on the very first push:
http://buildbot.askmonty.org/buildbot/builders/kvm-deb-bionic-ppc64le/builds/2948/steps/mtr/logs/stdio
http://buildbot.askmonty.org/buildbot/builders/kvm-deb-eoan-amd64/builds/234/steps/mtr/logs/stdio
I am able to repeat it locally:
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10.5 adb117cf6901a0e0da7577267be1209359892207
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main.backup_interaction 'innodb' w6 [ 7 fail ]
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Test ended at 2019-12-11 09:15:35
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CURRENT_TEST: main.backup_interaction
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--- /mariadb/10.5/mysql-test/main/backup_interaction.result 2019-10-28 17:09:53.002690675 +0200
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+++ /mariadb/10.5/mysql-test/main/backup_interaction.reject 2019-12-11 09:15:35.661386904 +0200
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@@ -105,6 +105,7 @@
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select lock_mode from information_schema.metadata_lock_info;
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lock_mode
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MDL_BACKUP_START
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+MDL_SHARED
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backup stage block_commit;
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commit;
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backup stage end;
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This was an optimized ASAN debug build with
ASAN_OPTIONS=abort_on_error=1 ./mtr --repeat=100 --parallel=auto main.backup_interaction{,,,,,,,,,,,}
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