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The test innodb.page_cleaner would occasionally time out like this:
@@ -2,6 +2,11 @@
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SET @save_pct_lwm= @@GLOBAL.innodb_max_dirty_pages_pct_lwm;
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SET GLOBAL innodb_max_dirty_pages_pct_lwm=0.0;
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SET GLOBAL innodb_max_dirty_pages_pct=0.0;
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+Timeout in wait_condition.inc for SELECT variable_value = 0
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+FROM information_schema.global_status
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+WHERE variable_name = 'INNODB_BUFFER_POOL_PAGES_DIRTY'
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+Id User Host db Command Time State Info Progress
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+28 root localhost test Query 0 starting show full processlist 0.000
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SET GLOBAL innodb_max_dirty_pages_pct=90.0;
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CREATE TABLE t ENGINE=InnoDB SELECT * FROM seq_1_to_10000;
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SELECT variable_value>0 FROM information_schema.global_status
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The reason is that we fail to wake up the buf_pool_page_cleaner from pthread_cond_wait() when innodb_max_dirty_pages_pct is assigned. Invoking pthread_cond_signal() on the condition variable is not enough, not even while holding buf_pool.flush_list_mutex.
Invoking buf_pool.page_cleaner_wakeup() seems to do the trick. With that fix, the test will execute several hundred times without failures.
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