Clang UndefinedBehaviorSanitize (Postgres14) Detected undefined-behavior

Hi,

Per Clang UBSan

Clang 10 (64 bits)

Postgres 14 (latest)

2020-08-27 01:02:14.930 -03 client backend[42432] pg_regress/create_table STATEMENT:  create table defcheck_0 partition of defcheck for values in (0);
indexcmds.c:1162:22: runtime error: null pointer passed as argument 2, which is declared to never be null
/usr/include/string.h:44:28: note: nonnull attribute specified here
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior indexcmds.c:1162:22 in
clog.c:299:10: runtime error: null pointer passed as argument 1, which is declared to never be null
/usr/include/string.h:65:33: note: nonnull attribute specified here
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior clog.c:299:10 in 

indexcmds.c (1162):

memcpy(part_oids, partdesc->oids, sizeof(Oid) * nparts);

clog.c (299):

memcmp(subxids, MyProc->subxids.xids,
  nsubxids * sizeof(TransactionId)) == 0)

xact.c (5285)

memcpy(&workspace[i], s->childXids,
  s->nChildXids * sizeof(TransactionId));

snapmgr.c (590)

memcpy(CurrentSnapshot->xip, sourcesnap->xip,
  sourcesnap->xcnt * sizeof(TransactionId));

copyfuncs.c:1190

COPY_POINTER_FIELD(uniqColIdx, from->uniqNumCols * sizeof(AttrNumber));

1.STATEMENT:  CREATE TABLESPACE regress_tblspacewith LOCATION '/usr/src/postgres/src/test/regress/testtablespace' WITH (some_nonexistent_parameter = true);
clog.c:299:10: runtime error: null pointer passed as argument 1, which is declared to never be null

2.STATEMENT:  CREATE TABLE testschema.dflt (a int PRIMARY KEY USING INDEX TABLESPACE regress_tblspace) PARTITION BY LIST (a);
indexcmds.c:1162:22: runtime error: null pointer passed as argument 2, which is declared to never be null

3.STATEMENT:  SELECT bool 'nay' AS error;
clog.c:299:10: runtime error: null pointer passed as argument 1, which is declared to never be null

4.STATEMENT:  SELECT U&'wrong: +0061' UESCAPE '+';
clog.c:299:10: runtime error: null pointer passed as argument 1, which is declared to never be null

5. STATEMENT:  ALTER TABLE circles ADD EXCLUDE USING gist
 (c1 WITH &&, (c2::circle) WITH &&);
xact.c:5285:25: runtime error: null pointer passed as argument 2, which is declared to never be null

6.STATEMENT:  COMMENT ON CONSTRAINT the_constraint ON DOMAIN no_comments_dom IS 'another bad comment';
snapmgr.c:590:31: runtime error: null pointer passed as argument 2, which is declared to never be null

7.STATEMENT:  create trigger my_table_col_update_trig
 after update of b on my_table referencing new table as new_table
 for each statement execute procedure dump_insert();
clog.c:299:10: runtime error: null pointer passed as argument 1, which is declared to never be null
/usr/include/string.h:65:33: note: nonnull attribute specified here
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior clog.c:299:10 in
xact.c:5285:25: runtime error: null pointer passed as argument 2, which is declared to never be null
/usr/include/string.h:44:28: note: nonnull attribute specified here
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior xact.c:5285:25 in
snapmgr.c:590:31: runtime error: null pointer passed as argument 2, which is declared to never be null
/usr/include/string.h:44:28: note: nonnull attribute specified here
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior snapmgr.c:590:31 in
snapmgr.c:594:34: runtime error: null pointer passed as argument 2, which is declared to never be null
/usr/include/string.h:44:28: note: nonnull attribute specified here
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior snapmgr.c:594:34 in
clog.c:299:10: runtime error: null pointer passed as argument 1, which is declared to never be null
/usr/include/string.h:65:33: note: nonnull attribute specified here
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior clog.c:299:10 in
clog.c:299:10: runtime error: null pointer passed as argument 1, which is declared to never be null
/usr/include/string.h:65:33: note: nonnull attribute specified here
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior clog.c:299:10 in 8.
clog.c:299:10: runtime error: null pointer passed as argument 1, which is declared to never be null
/usr/include/string.h:65:33: note: nonnull attribute specified here
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior clog.c:299:10 in
clog.c:299:10: runtime error: null pointer passed as argument 1, which is declared to never be null
/usr/include/string.h:65:33: note: nonnull attribute specified here
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior clog.c:299:10 in

8.STATEMENT:  select array_fill(1, array[[1,2],[3,4]]);
copyfuncs.c:1190:2: runtime error: null pointer passed as argument 2, which is declared to never be null

I stopped counting clog.c (299).

If anyone wants, the full report, it has 2mb.

Ranier Vilela