Re: [Proposal] Global temporary tables

Hi Wenjing,

Please check below scenario, we are getting a server crash with "ALTER
TABLE" add column with default value as sequence:

-- Create gtt, exit and re-connect the psql prompt, create sequence, alter
table add a column with sequence.
postgres=# create global temporary table gtt1 (c1 int);
CREATE TABLE
postgres=# \q
[edb(at)localhost bin]$ ./psql postgres
psql (13devel)
Type "help" for help.

postgres=# create sequence seq;
CREATE SEQUENCE
postgres=# alter table gtt1 add c2 int default nextval('seq');
server closed the connection unexpectedly
This probably means the server terminated abnormally
before or while processing the request.
The connection to the server was lost. Attempting reset: Failed.
!?> \q

-- Stack trace:
[edb(at)localhost bin]$ gdb -q -c data/core.70358 postgres
Reading symbols from
/home/edb/PG/PGsrcNew/postgresql/inst/bin/postgres...done.
[New LWP 70358]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Core was generated by `postgres: edb postgres [local] ALTER TABLE
'.
Program terminated with signal 6, Aborted.
#0 0x00007f150223b337 in raise () from /lib64/libc.so.6
Missing separate debuginfos, use: debuginfo-install
glibc-2.17-292.el7.x86_64 keyutils-libs-1.5.8-3.el7.x86_64
krb5-libs-1.15.1-37.el7_7.2.x86_64 libcom_err-1.42.9-16.el7.x86_64
libgcc-4.8.5-39.el7.x86_64 libselinux-2.5-14.1.el7.x86_64
openssl-libs-1.0.2k-19.el7.x86_64 pcre-8.32-17.el7.x86_64
zlib-1.2.7-18.el7.x86_64
(gdb) bt
#0 0x00007f150223b337 in raise () from /lib64/libc.so.6
#1 0x00007f150223ca28 in abort () from /lib64/libc.so.6
#2 0x0000000000ab2cdd in ExceptionalCondition (conditionName=0xc03ab8
"OidIsValid(relfilenode1) && OidIsValid(relfilenode2)",
errorType=0xc0371f "FailedAssertion", fileName=0xc03492 "cluster.c",
lineNumber=1637) at assert.c:67
#3 0x000000000065e200 in gtt_swap_relation_files (r1=16384, r2=16390,
target_is_pg_class=false, swap_toast_by_content=false, is_internal=true,
frozenXid=490, cutoffMulti=1, mapped_tables=0x7ffd841f7ee0) at
cluster.c:1637
#4 0x000000000065dcd9 in finish_heap_swap (OIDOldHeap=16384,
OIDNewHeap=16390, is_system_catalog=false, swap_toast_by_content=false,
check_constraints=true, is_internal=true, frozenXid=490, cutoffMulti=1,
newrelpersistence=103 'g') at cluster.c:1395
#5 0x00000000006bca18 in ATRewriteTables (parsetree=0x1deab80,
wqueue=0x7ffd841f80c8, lockmode=8, context=0x7ffd841f8260) at
tablecmds.c:4991
#6 0x00000000006ba890 in ATController (parsetree=0x1deab80,
rel=0x7f150378f330, cmds=0x1deab28, recurse=true, lockmode=8,
context=0x7ffd841f8260)
at tablecmds.c:3991
#7 0x00000000006ba4f8 in AlterTable (stmt=0x1deab80, lockmode=8,
context=0x7ffd841f8260) at tablecmds.c:3644
#8 0x000000000093b62a in ProcessUtilitySlow (pstate=0x1e0d6d0,
pstmt=0x1deac48,
queryString=0x1de9b30 "alter table gtt1 add c2 int default
nextval('seq');", context=PROCESS_UTILITY_TOPLEVEL, params=0x0,
queryEnv=0x0, dest=0x1deaf28,
qc=0x7ffd841f8830) at utility.c:1267
#9 0x000000000093b141 in standard_ProcessUtility (pstmt=0x1deac48,
queryString=0x1de9b30 "alter table gtt1 add c2 int default
nextval('seq');",
context=PROCESS_UTILITY_TOPLEVEL, params=0x0, queryEnv=0x0,
dest=0x1deaf28, qc=0x7ffd841f8830) at utility.c:1067
#10 0x000000000093a22b in ProcessUtility (pstmt=0x1deac48,
queryString=0x1de9b30 "alter table gtt1 add c2 int default
nextval('seq');",
context=PROCESS_UTILITY_TOPLEVEL, params=0x0, queryEnv=0x0,
dest=0x1deaf28, qc=0x7ffd841f8830) at utility.c:522
#11 0x000000000093909d in PortalRunUtility (portal=0x1e4fba0,
pstmt=0x1deac48, isTopLevel=true, setHoldSnapshot=false, dest=0x1deaf28,
qc=0x7ffd841f8830)
at pquery.c:1157
#12 0x00000000009392b3 in PortalRunMulti (portal=0x1e4fba0,
isTopLevel=true, setHoldSnapshot=false, dest=0x1deaf28, altdest=0x1deaf28,
qc=0x7ffd841f8830)
at pquery.c:1303
#13 0x00000000009387d1 in PortalRun (portal=0x1e4fba0,
count=9223372036854775807, isTopLevel=true, run_once=true, dest=0x1deaf28,
altdest=0x1deaf28,
qc=0x7ffd841f8830) at pquery.c:779
#14 0x000000000093298b in exec_simple_query (query_string=0x1de9b30 "alter
table gtt1 add c2 int default nextval('seq');") at postgres.c:1239
#15 0x0000000000936997 in PostgresMain (argc=1, argv=0x1e13b80,
dbname=0x1e13a78 "postgres", username=0x1e13a58 "edb") at postgres.c:4315
#16 0x00000000008868b3 in BackendRun (port=0x1e0bb50) at postmaster.c:4510
#17 0x00000000008860a8 in BackendStartup (port=0x1e0bb50) at
postmaster.c:4202
#18 0x0000000000882626 in ServerLoop () at postmaster.c:1727
#19 0x0000000000881efd in PostmasterMain (argc=3, argv=0x1de4460) at
postmaster.c:1400
#20 0x0000000000789288 in main (argc=3, argv=0x1de4460) at main.c:210
(gdb)

--

With Regards,
Prabhat Kumar Sahu
EnterpriseDB: http://www.enterprisedb.com