From e19a494287037b24b272b0a88cb48baf80a1df09 Mon Sep 17 00:00:00 2001 From: Sunny Bains Date: Thu, 5 Aug 2010 19:18:17 +1000 Subject: [PATCH] Fix bug# 55543 - InnoDB Plugin: Signal 6: Assertion failure in file fil/fil0fil.c line 4306 The bug is due to a double delete of a BLOB, once via: rollback -> btr_cur_pessimistic_delete() and the second time via purge. The bug is in row_upd_clust_rec_by_insert(). There we relinquish ownership of the non-updated BLOB columns in btr_cur_mark_extern_inherited_fields() before building the row entry that will be inserted and whose contents will be logged in the UNDO log. However, we don't set the BLOB column later to INHERITED so that a possible rollback will not free the original row's non-updated BLOB entries. This is because the condition that checks for that is in : if (node->upd_ext) {}. node->upd_ext is non-NULL only if a BLOB column was updated and that column is part of some key ordering (see row_upd_replace()). This results in the non-update BLOB columns being deleted during a rollback and subsequently by purge again. rb://413 --- storage/innodb_plugin/btr/btr0cur.c | 12 +++++++++--- storage/innodb_plugin/include/btr0cur.h | 5 +++-- storage/innodb_plugin/row/row0upd.c | 12 +++++++----- 3 files changed, 19 insertions(+), 10 deletions(-) diff --git a/storage/innodb_plugin/btr/btr0cur.c b/storage/innodb_plugin/btr/btr0cur.c index 7fa7d42320a..8db12a0bbb8 100644 --- a/storage/innodb_plugin/btr/btr0cur.c +++ b/storage/innodb_plugin/btr/btr0cur.c @@ -3484,9 +3484,10 @@ btr_cur_set_ownership_of_extern_field( Marks not updated extern fields as not-owned by this record. The ownership is transferred to the updated record which is inserted elsewhere in the index tree. In purge only the owner of externally stored field is allowed -to free the field. */ +to free the field. +@return TRUE if BLOB ownership was transferred */ UNIV_INTERN -void +ibool btr_cur_mark_extern_inherited_fields( /*=================================*/ page_zip_des_t* page_zip,/*!< in/out: compressed page whose uncompressed @@ -3500,13 +3501,14 @@ btr_cur_mark_extern_inherited_fields( ulint n; ulint j; ulint i; + ibool change_ownership = FALSE; ut_ad(rec_offs_validate(rec, NULL, offsets)); ut_ad(!rec_offs_comp(offsets) || !rec_get_node_ptr_flag(rec)); if (!rec_offs_any_extern(offsets)) { - return; + return(FALSE); } n = rec_offs_n_fields(offsets); @@ -3529,10 +3531,14 @@ btr_cur_mark_extern_inherited_fields( btr_cur_set_ownership_of_extern_field( page_zip, rec, index, offsets, i, FALSE, mtr); + + change_ownership = TRUE; updated: ; } } + + return(change_ownership); } /*******************************************************************//** diff --git a/storage/innodb_plugin/include/btr0cur.h b/storage/innodb_plugin/include/btr0cur.h index 7dc2eb63cf5..e151fdcb563 100644 --- a/storage/innodb_plugin/include/btr0cur.h +++ b/storage/innodb_plugin/include/btr0cur.h @@ -468,9 +468,10 @@ btr_estimate_number_of_different_key_vals( Marks not updated extern fields as not-owned by this record. The ownership is transferred to the updated record which is inserted elsewhere in the index tree. In purge only the owner of externally stored field is allowed -to free the field. */ +to free the field. +@return TRUE if BLOB ownership was transferred */ UNIV_INTERN -void +ibool btr_cur_mark_extern_inherited_fields( /*=================================*/ page_zip_des_t* page_zip,/*!< in/out: compressed page whose uncompressed diff --git a/storage/innodb_plugin/row/row0upd.c b/storage/innodb_plugin/row/row0upd.c index 397b117c067..04c3139fcc7 100644 --- a/storage/innodb_plugin/row/row0upd.c +++ b/storage/innodb_plugin/row/row0upd.c @@ -1598,6 +1598,7 @@ row_upd_clust_rec_by_insert( dict_table_t* table; dtuple_t* entry; ulint err; + ibool change_ownership = FALSE; ut_ad(node); ut_ad(dict_index_is_clust(index)); @@ -1630,9 +1631,9 @@ row_upd_clust_rec_by_insert( index = dict_table_get_first_index(table); offsets = rec_get_offsets(rec, index, offsets_, ULINT_UNDEFINED, &heap); - btr_cur_mark_extern_inherited_fields( - btr_cur_get_page_zip(btr_cur), - rec, index, offsets, node->update, mtr); + change_ownership = btr_cur_mark_extern_inherited_fields( + btr_cur_get_page_zip(btr_cur), rec, index, offsets, + node->update, mtr); if (check_ref) { /* NOTE that the following call loses the position of pcur ! */ @@ -1661,10 +1662,11 @@ row_upd_clust_rec_by_insert( row_upd_index_entry_sys_field(entry, index, DATA_TRX_ID, trx->id); - if (node->upd_ext) { + if (change_ownership) { /* If we return from a lock wait, for example, we may have extern fields marked as not-owned in entry (marked in the - if-branch above). We must unmark them. */ + if-branch above). We must unmark them, take the ownership + back. */ btr_cur_unmark_dtuple_extern_fields(entry);