(Re-submitting/formatting to get under the 40K message size limit) The coredump @565 is due to tp being NULL. Since it just got past the assertion @563, the problem has to be down in cs_add(). 563 assert(tp); 564 cs_add(&t->tables, tp, TR_OLD); 565 tp->p = t; I've dug down into cs_add(), but it isn't obvious to me where tp is getting set to NULL. Since it looks like you have a fairly straightforward test case, I would submit a bug report. From: users-list [mailto:users-list-bounces+david.b.anderson=citi.com@monetdb.org] On Behalf Of Ariel Abadi Sent: Monday, July 18, 2016 1:25 PM To: Communication channel for MonetDB users Subject: Re: MERGE TABLE ERROR Finally I make it to start it on debugger... Here is the trace... Can someone help us ? Thks in advance! gdb --args /usr/local/bin/mserver5 --dbpath=/opt/monetdb/db_error/sb_traf --set merovingian_uri=mapi:monetdb://monetbd-test:54321/sb_traf --set mapi_open=false --set mapi_port=0 --set mapi_usock=/opt/monetdb/db_error/sb_traf/.mapi.sock --set monet_vault_key=/opt/monetdb/db_error/sb_traf/.vaultkey --set gdk_nr_threads=8 --set max_clients=64 --set sql_optimizer=default_pipe --set monet_daemon=yes --dbinit="sql.start();" GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-80.el7 Copyright (C) 2013 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl.html This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-redhat-linux-gnu". For bug reporting instructions, please see: http://www.gnu.org/software/gdb/bugs/... Reading symbols from /usr/local/bin/mserver5...done. (gdb) r Starting program: /usr/local/bin/mserver5 --dbpath=/opt/monetdb/db_error/sb_traf --set merovingian_uri=mapi:monetdb://monetbd-test:54321/sb_traf --set mapi_open=false --set mapi_port=0 --set mapi_usock=/opt/monetdb/db_error/sb_traf/.mapi.sock --set monet_vault_key=/opt/monetdb/db_error/sb_traf/.vaultkey --set gdk_nr_threads=8 --set max_clients=64 --set sql_optimizer=default_pipe --set monet_daemon=yes --dbinit=sql.start\(\)\; [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib64/libthread_db.so.1". # MonetDB 5 server v11.23.3 "Jun2016" # Serving database 'sb_traf', using 8 threads # Compiled for x86_64-unknown-linux-gnu/64bit with 64bit OIDs and 128bit integers dynamically linked # Found 30.000 GiB available main-memory. # Copyright (c) 1993-July 2008 CWI. # Copyright (c) August 2008-2016 MonetDB B.V., all rights reserved # Visit http://www.monetdb.org/ for further information [New Thread 0x7fffeb66b700 (LWP 23533)] [New Thread 0x7fffea7eb700 (LWP 23534)] # Listening for UNIX domain connection requests on mapi:monetdb:///opt/monetdb/db_error/sb_traf/.mapi.sock Program received signal SIGSEGV, Segmentation fault. 0x00007fffeb155e97 in load_table_parts (tr=0x4e59780, t=0x4ff02c0, rid=44) at ../../../MonetDB-11.23.3/sql/storage/store.c:565 565 tp->p = t; (gdb) where #0 0x00007fffeb155e97 in load_table_parts (tr=0x4e59780, t=0x4ff02c0, rid=44) at ../../../MonetDB-11.23.3/sql/storage/store.c:565 #1 0x00007fffeb155ffa in load_tables_of_tables (tr=0x4e59780, s=0x4fd1790) at ../../../MonetDB-11.23.3/sql/storage/store.c:587 #2 0x00007fffeb158088 in load_schema (tr=0x4e59780, id=2155, rid=9223372036854775808) at ../../../MonetDB-11.23.3/sql/storage/store.c:934 #3 0x00007fffeb15863f in load_trans (tr=0x4e59780, id=2155) at ../../../MonetDB-11.23.3/sql/storage/store.c:1003 #4 0x00007fffeb15acd0 in store_load () at ../../../MonetDB-11.23.3/sql/storage/store.c:1552 #5 0x00007fffeb15af07 in store_init (debug=0, store=store_bat, readonly=0, singleuser=0, log_settings=0x7fffffffd300, stk=0) at ../../../MonetDB-11.23.3/sql/storage/store.c:1615 #6 0x00007fffeb0d7a24 in mvc_init (debug=0, store=store_bat, ro=0, su=0, stk=0) at ../../../MonetDB-11.23.3/sql/server/sql_mvc.c:60 #7 0x00007fffeb04cdce in SQLinit () at ../../../../MonetDB-11.23.3/sql/backends/monet5/sql_scenario.c:252 #8 0x00007fffeb04cb0e in SQLprelude (ret=0x4cf6840) at ../../../../MonetDB-11.23.3/sql/backends/monet5/sql_scenario.c:178 #9 0x00007ffff79d1403 in malCommandCall (stk=0x4cf6630, pci=0x4bca750) at ../../../MonetDB-11.23.3/monetdb5/mal/mal_interpreter.c:77 #10 0x00007ffff79d3a29 in runMALsequence (cntxt=0x7fffeb66c020, mb=0x609660, startpc=1, stoppc=0, stk=0x4cf6630, env=0x0, pcicaller=0x0) at ../../../MonetDB-11.23.3/monetdb5/mal/mal_interpreter.c:658 #11 0x00007ffff79d2c3c in runMAL (cntxt=0x7fffeb66c020, mb=0x609660, mbcaller=0x0, env=0x0) at ../../../MonetDB-11.23.3/monetdb5/mal/mal_interpreter.c:354 #12 0x00007ffff79f23cb in MALengine (c=0x7fffeb66c020) at ../../../MonetDB-11.23.3/monetdb5/mal/mal_session.c:650 #13 0x00007ffff79f0a8c in malBootstrap () at ../../../MonetDB-11.23.3/monetdb5/mal/mal_session.c:62 #14 0x00007ffff79b7ff9 in mal_init () at ../../../MonetDB-11.23.3/monetdb5/mal/mal.c:103 #15 0x00000000004036c8 in main (argc=21, av=0x7fffffffe478) at ../../../MonetDB-11.23.3/tools/mserver/mserver5.c:658 (gdb) l 560 void *v = table_funcs.column_find_value(tr, find_sql_column(objects, "name"), rid); 561 sql_table *tp = find_sql_table(t->s, v); _DELETE(v); 562 563 assert(tp); 564 cs_add(&t->tables, tp, TR_OLD); 565 tp->p = t; 566 } 567 568 static void 569 load_tables_of_tables(sql_trans *tr, sql_schema *s) (gdb) p tp $1 = (sql_table *) 0x0 (gdb) p &t $2 = (sql_table **) 0x7fffffffcfd0