MDEV-20688 Recovery crashes after unnecessarily reading a corrupted page

The test encryption.innodb-redo-badkey was accidentally disabled
until commit 23657a2 enabled
it recently. Once it was enabled, it started failing randomly.

recv_recover_corrupt_page(): Do not assume that any redo log exists
for the page. A page may be unnecessarily read by read-ahead.
When noting the corruption, reset recv_addr->state to RECV_PROCESSED,
so that even if the same page is re-read again, we will only
decrement recv_sys->n_addrs once.

Author: Thirunarayanan

mysql-test/suite/encryption/r/innodb-redo-badkey.result

@@ -1,9 +1,10 @@
 call mtr.add_suppression("Plugin 'file_key_management'");
 call mtr.add_suppression("Plugin 'InnoDB' init function returned error.");
-call mtr.add_suppression("InnoDB: The page \\[page id: space=[1-9][0-9]*, page number=[0-9]+\\] in file .*test/t[1-4]\\.ibd cannot be decrypted");
+call mtr.add_suppression("InnoDB: The page \\[page id: space=[1-9][0-9]*, page number=[0-9]+\\] in file '.*test/t[1-4]\\.ibd' cannot be decrypted");
 call mtr.add_suppression("failed to read or decrypt \\[page id: space=[1-9][0-9]*, page number=[1-9][0-9]*\\]");
-call mtr.add_suppression("InnoDB: Unable to decompress .*.test.t1\\.ibd\\[page id: space=[1-9][0-9]*, page number=[0-9]+\\]");
-call mtr.add_suppression("InnoDB: Database page corruption on disk or a failed file read of tablespace test/t1 page \\[page id: space=[1-9][0-9]*, page number=[0-9]*\\]");
+call mtr.add_suppression("InnoDB: Unable to decompress .*.test.t[12]\\.ibd\\[page id: space=[1-9][0-9]*, page number=[0-9]+\\]");
+call mtr.add_suppression("InnoDB: Database page corruption on disk or a failed file read of tablespace test/t[12] page \\[page id: space=[1-9][0-9]*, page number=[0-9]*\\]");
+call mtr.add_suppression("InnoDB: Failed to read file '.*' at offset .*");
 call mtr.add_suppression("InnoDB: Plugin initialization aborted");
 call mtr.add_suppression("Plugin 'InnoDB' registration as a STORAGE ENGINE failed");
 # Restart mysqld --file-key-management-filename=keys2.txt

mysql-test/suite/encryption/t/innodb-redo-badkey.test

@@ -5,10 +5,11 @@
 
 call mtr.add_suppression("Plugin 'file_key_management'");
 call mtr.add_suppression("Plugin 'InnoDB' init function returned error.");
-call mtr.add_suppression("InnoDB: The page \\[page id: space=[1-9][0-9]*, page number=[0-9]+\\] in file .*test/t[1-4]\\.ibd cannot be decrypted");
+call mtr.add_suppression("InnoDB: The page \\[page id: space=[1-9][0-9]*, page number=[0-9]+\\] in file '.*test/t[1-4]\\.ibd' cannot be decrypted");
 call mtr.add_suppression("failed to read or decrypt \\[page id: space=[1-9][0-9]*, page number=[1-9][0-9]*\\]");
-call mtr.add_suppression("InnoDB: Unable to decompress .*.test.t1\\.ibd\\[page id: space=[1-9][0-9]*, page number=[0-9]+\\]");
-call mtr.add_suppression("InnoDB: Database page corruption on disk or a failed file read of tablespace test/t1 page \\[page id: space=[1-9][0-9]*, page number=[0-9]*\\]");
+call mtr.add_suppression("InnoDB: Unable to decompress .*.test.t[12]\\.ibd\\[page id: space=[1-9][0-9]*, page number=[0-9]+\\]");
+call mtr.add_suppression("InnoDB: Database page corruption on disk or a failed file read of tablespace test/t[12] page \\[page id: space=[1-9][0-9]*, page number=[0-9]*\\]");
+call mtr.add_suppression("InnoDB: Failed to read file '.*' at offset .*");
 call mtr.add_suppression("InnoDB: Plugin initialization aborted");
 call mtr.add_suppression("Plugin 'InnoDB' registration as a STORAGE ENGINE failed");
 

storage/innobase/log/log0recv.cc

@@ -2221,18 +2221,20 @@ void recv_recover_corrupt_page(page_id_t page_id)
 	mutex_enter(&recv_sys->mutex);
 
 	if (!recv_sys->apply_log_recs) {
-		mutex_exit(&recv_sys->mutex);
-		return;
-	}
-
-	recv_addr_t* recv_addr = recv_get_fil_addr_struct(
-			page_id.space(), page_id.page_no());
-
-	ut_ad(recv_addr->state != RECV_WILL_NOT_READ);
-
-	if (recv_addr->state != RECV_BEING_PROCESSED
-	    && recv_addr->state != RECV_PROCESSED) {
-		recv_sys->n_addrs--;
+	} else if (recv_addr_t* recv_addr = recv_get_fil_addr_struct(
+			   page_id.space(), page_id.page_no())) {
+		switch (recv_addr->state) {
+		case RECV_WILL_NOT_READ:
+			ut_ad(!"wrong state");
+			break;
+		case RECV_BEING_PROCESSED:
+		case RECV_PROCESSED:
+			break;
+		default:
+			recv_addr->state = RECV_PROCESSED;
+			ut_ad(recv_sys->n_addrs);
+			recv_sys->n_addrs--;
+		}
 	}
 
 	mutex_exit(&recv_sys->mutex);