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));
snapmgr.c (594)
memcpy(CurrentSnapshot->subxip, sourcesnap->subxip,
sourcesnap->subxcnt * 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