Description:
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We experienced lost data because the mysqli::commit() function does not throw under some conditions if mysqlnd is used. We configured mysqli to use report_mode = MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT.

We use a MySQL Galera cluster setup and during reboots of nodes deadlocks in the commit query can occur.

However, these deadlocks do not cause an exception to be thrown if the ::commit() method is used. Instead, false is returned. In practice, the call fails silently. 

Sending COMMIT queries manually works as expected (an exception is thrown on a dead lock).

You can see in https://github.com/php/php-src/blob/5f54f48024783df739dd5bbec64cb74063fefa06/ext/mysqli/mysqli_api.c#L741 that the error handling is missing for mysqlnd if you compare to https://github.com/php/php-src/blob/5f54f48024783df739dd5bbec64cb74063fefa06/ext/mysqli/mysqli_api.c#L1579. I'd guess that the MYSQLI_REPORT_MYSQL_ERROR macro is missing. 






Expected result:
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If the commit() method encounters a "Deadlock found when trying to get lock; try restarting transaction" error (1213 code), with report_mode = MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT we expect it to throw mysqli_sql_exception.

Actual result:
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False is returned, e.g. the report_mode is ignored.