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In a 10.5-based branch, we got an assertion failure on the shutdown of mariabackup --prepare:
2020-09-18 6:37:20 0 [Note] InnoDB: Initializing buffer pool, total size = 104857600, chunk size = 104857600
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2020-09-18 6:37:20 0 [Note] InnoDB: Completed initialization of buffer pool
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2020-09-18 6:37:21 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
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2020-09-18 6:37:21 0 [Note] InnoDB: Starting crash recovery from checkpoint LSN=3423646
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2020-09-18 6:37:21 0 [Note] InnoDB: Starting final batch to recover 44 pages from redo log.
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2020-09-18 6:37:22 0 [Note] InnoDB: Last binlog file './mysql-bin.000001', position 970415
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[00] 2020-09-18 06:37:23 Last binlog file ./mysql-bin.000001, position 970415
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2020-09-18 06:37:23 0x2bf14d750800 InnoDB: Assertion failure in file /home/mleich/Server/bb-10.5-MDEV-23399B/storage/innobase/fil/fil0fil.cc line 508
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InnoDB: Failing assertion: n_pending_flushes == 0
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I believe that this failure is possible also during server shutdown.
The fix should be to check for pending flushes while closing files:
diff --git a/storage/innobase/fil/fil0fil.cc b/storage/innobase/fil/fil0fil.cc
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index f549938bfc2..84425e0d1b6 100644
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--- a/storage/innobase/fil/fil0fil.cc
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+++ b/storage/innobase/fil/fil0fil.cc
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@@ -1601,7 +1601,8 @@ void fil_close_all_files()
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if (!node->is_open()) {
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goto next;
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}
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- if (!node->n_pending) {
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+ if (!node->n_pending
|
+ && !node->n_pending_flushes) {
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node->close();
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goto next;
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}
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@@ -1609,7 +1610,9 @@ void fil_close_all_files()
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|
ib::error() << "File '" << node->name
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<< "' has " << node->n_pending
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- << " operations";
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+ << " operations and "
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+ << node->n_pending_flushes
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+ << " flushes";
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}
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space = UT_LIST_GET_NEXT(space_list, space);
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