innodb.log_file_size '4k,innodb'         w5 [ fail ]

…

2022-02-14 17:45:38 0 [Note] InnoDB: Starting final batch to recover 4 pages from redo log.

2022-02-14 17:45:38 0 [Note] InnoDB: Resizing redo log from 12.000MiB to 5.000MiB; LSN=24674766

mariadbd: /home/buildbot/maria-slave/fulltest-debug-big-only/build/storage/innobase/srv/srv0start.cc:852: lsn_t srv_prepare_to_delete_redo_log_file(): Assertion `!buf_pool.any_io_pending()' failed.

diff --git a/storage/innobase/include/buf0buf.h b/storage/innobase/include/buf0buf.h

index 89987b05fdb..fec8dcb4e2a 100644

--- a/storage/innobase/include/buf0buf.h

+++ b/storage/innobase/include/buf0buf.h

@@ -2042,9 +2042,14 @@ class buf_pool_t

   buf_tmp_buffer_t *io_buf_reserve() { return io_buf.reserve(); }

   /** @return whether any I/O is pending */

-  bool any_io_pending() const

+  bool any_io_pending()

   {

-    return n_pend_reads || n_flush_LRU() || n_flush_list();

+    if (n_pend_reads)

+      return true;

+    mysql_mutex_lock(&mutex);

+    const bool any_pending{n_flush_LRU_ || n_flush_list_};

+    mysql_mutex_unlock(&mutex);

+    return any_pending;

   }

   /** @return total amount of pending I/O */

   ulint io_pending() const