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Note: It's a continuation of MDEV-13475 and is probably a side-effect of it; but I want to have the assertion failure filed for the record, to have it searchable.
After the scenario in MDEV-13475 is executed and the failure described there occurs, start the server again, now without innodb-read-only (it starts all right), and try to execute some DML on a table, e.g. INSERT INTO t1 VALUES (2) on the datadir attached to MDEV-13475.
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bb-10.3-monty 6baa5e56f1
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mysqld: /data/src/bb-10.3-monty/storage/innobase/trx/trx0rec.cc:473: ulint trx_undo_page_report_insert(ib_page_t*, trx_t*, dict_index_t*, const dtuple_t*, mtr_t*): Assertion `*reinterpret_cast<uint16*>(38U + 0 + undo_page) =
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= 0' failed.
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170809 1:21:08 [ERROR] mysqld got signal 6 ;
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#7 0x00007f142f09aee2 in __assert_fail () from /lib/x86_64-linux-gnu/libc.so.6
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#8 0x000056167a37e241 in trx_undo_page_report_insert (undo_page=0x7f140c050000 "\245K", <incomplete sequence \350>, trx=0x7f14198ddca8, index=0x7f13c0029fe8, clust_entry=0x7f13c0007eb8, mtr=0x7f14198d8580) at /data/src/bb-10.3-monty/storage/innobase/trx/trx0rec.cc:472
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#9 0x000056167a381be0 in trx_undo_report_row_operation (thr=0x7f13c0021500, index=0x7f13c0029fe8, clust_entry=0x7f13c0007eb8, update=0x0, cmpl_info=0, rec=0x0, offsets=0x0, roll_ptr=0x7f14198d8b30) at /data/src/bb-10.3-monty/storage/innobase/trx/trx0rec.cc:1933
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#10 0x000056167a3d6c76 in btr_cur_ins_lock_and_undo (flags=0, cursor=0x7f14198d8fe0, entry=0x7f13c0007eb8, thr=0x7f13c0021500, mtr=0x7f14198d9400, inherit=0x7f14198d8bc0) at /data/src/bb-10.3-monty/storage/innobase/btr/btr0cur.cc:2827
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#11 0x000056167a3d75b6 in btr_cur_optimistic_insert (flags=0, cursor=0x7f14198d8fe0, offsets=0x7f14198d8f80, heap=0x7f14198d8f78, entry=0x7f13c0007eb8, rec=0x7f14198d8f88, big_rec=0x7f14198d8f70, n_ext=0, thr=0x7f13c0021500, mtr=0x7f14198d9400) at /data/src/bb-10.3-monty/storage/innobase/btr/btr0cur.cc:3040
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#12 0x000056167a2aee25 in row_ins_clust_index_entry_low (flags=0, mode=2, index=0x7f13c0029fe8, n_uniq=0, entry=0x7f13c0007eb8, n_ext=0, thr=0x7f13c0021500, dup_chk_only=false) at /data/src/bb-10.3-monty/storage/innobase/row/row0ins.cc:2719
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#13 0x000056167a2b04c5 in row_ins_clust_index_entry (index=0x7f13c0029fe8, entry=0x7f13c0007eb8, thr=0x7f13c0021500, n_ext=0, dup_chk_only=false) at /data/src/bb-10.3-monty/storage/innobase/row/row0ins.cc:3215
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#14 0x000056167a2b088f in row_ins_index_entry (index=0x7f13c0029fe8, entry=0x7f13c0007eb8, thr=0x7f13c0021500) at /data/src/bb-10.3-monty/storage/innobase/row/row0ins.cc:3322
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#15 0x000056167a2b0da1 in row_ins_index_entry_step (node=0x7f13c00212a8, thr=0x7f13c0021500) at /data/src/bb-10.3-monty/storage/innobase/row/row0ins.cc:3472
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#16 0x000056167a2b1160 in row_ins (node=0x7f13c00212a8, thr=0x7f13c0021500) at /data/src/bb-10.3-monty/storage/innobase/row/row0ins.cc:3614
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#17 0x000056167a2b18f5 in row_ins_step (thr=0x7f13c0021500) at /data/src/bb-10.3-monty/storage/innobase/row/row0ins.cc:3818
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#18 0x000056167a2cf529 in row_insert_for_mysql (mysql_rec=0x7f13c000e708 "\375\002", prebuilt=0x7f13c0020af8) at /data/src/bb-10.3-monty/storage/innobase/row/row0mysql.cc:1484
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#19 0x000056167a18e816 in ha_innobase::write_row (this=0x7f13c0020308, record=0x7f13c000e708 "\375\002") at /data/src/bb-10.3-monty/storage/innobase/handler/ha_innodb.cc:8444
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#20 0x0000561679e83680 in handler::ha_write_row (this=0x7f13c0020308, buf=0x7f13c000e708 "\375\002") at /data/src/bb-10.3-monty/sql/handler.cc:5982
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#21 0x0000561679b9c009 in write_record (thd=0x7f13c0000b00, table=0x7f13c001f700, info=0x7f14198da200) at /data/src/bb-10.3-monty/sql/sql_insert.cc:1929
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#22 0x0000561679b99a8b in mysql_insert (thd=0x7f13c0000b00, table_list=0x7f13c0013528, fields=..., values_list=..., update_fields=..., update_values=..., duplic=DUP_ERROR, ignore=false) at /data/src/bb-10.3-monty/sql/sql_insert.cc:1057
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#23 0x0000561679bcafcc in mysql_execute_command (thd=0x7f13c0000b00) at /data/src/bb-10.3-monty/sql/sql_parse.cc:4621
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#24 0x0000561679bd56b6 in mysql_parse (thd=0x7f13c0000b00, rawbuf=0x7f13c0013448 "insert into t1 values (2)", length=25, parser_state=0x7f14198db660, is_com_multi=false, is_next_command=false) at /data/src/bb-10.3-monty/sql/sql_parse.cc:7919
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#25 0x0000561679bc383f in dispatch_command (command=COM_QUERY, thd=0x7f13c0000b00, packet=0x7f13c001a571 "insert into t1 values (2)", packet_length=25, is_com_multi=false, is_next_command=false) at /data/src/bb-10.3-monty/sql/sql_parse.cc:1829
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#26 0x0000561679bc22e1 in do_command (thd=0x7f13c0000b00) at /data/src/bb-10.3-monty/sql/sql_parse.cc:1380
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#27 0x0000561679d115cc in do_handle_one_connection (connect=0x56167dc22240) at /data/src/bb-10.3-monty/sql/sql_connect.cc:1354
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#28 0x0000561679d11359 in handle_one_connection (arg=0x56167dc22240) at /data/src/bb-10.3-monty/sql/sql_connect.cc:1260
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#29 0x00007f1430fdf494 in start_thread (arg=0x7f14198dc700) at pthread_create.c:333
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#30 0x00007f142f15793f in clone () from /lib/x86_64-linux-gnu/libc.so.6
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