[CLOBBER_CACHE]Server crashed with segfault 11 while executing clusterdb

Hello,

While executing the below test case server crashed with Segfault 11 on
master branch.
I have enabled the CLOBBER_CACHE_ALWAYS in src/include/pg_config_manual.h

Issue is only reproducing on master branch.

*Test Case:*
CREATE TABLE sm_5_323_table (col1 numeric);
CREATE INDEX sm_5_323_idx ON sm_5_323_table(col1);

CLUSTER sm_5_323_table USING sm_5_323_idx;

\! /PGClobber_build/postgresql/inst/bin/clusterdb -t sm_5_323_table -U edb
-h localhost -p 5432 -d postgres

*Test case output:*
edb(at)edb:~/PGClobber_build/postgresql/inst/bin$ ./psql postgres
psql (14devel)
Type "help" for help.

postgres=# CREATE TABLE sm_5_323_table (col1 numeric);
CREATE TABLE
postgres=# CREATE INDEX sm_5_323_idx ON sm_5_323_table(col1);
CREATE INDEX
postgres=# CLUSTER sm_5_323_table USING sm_5_323_idx;
CLUSTER
postgres=# \! /PGClobber_build/postgresql/inst/bin/clusterdb -t
sm_5_323_table -U edb -h localhost -p 5432 -d postgres
clusterdb: error: clustering of table "sm_5_323_table" in database
"postgres" failed: server closed the connection unexpectedly
This probably means the server terminated abnormally
before or while processing the request.

*Stack Trace:*
Core was generated by `postgres: edb postgres 127.0.0.1(50978) CLUSTER
'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x000055e5c85ea0b4 in mdopenfork (reln=0x0, forknum=MAIN_FORKNUM,
behavior=1) at md.c:485
485 if (reln->md_num_open_segs[forknum] > 0)
(gdb) bt
#0 0x000055e5c85ea0b4 in mdopenfork (reln=0x0, forknum=MAIN_FORKNUM,
behavior=1) at md.c:485
#1 0x000055e5c85eb2f0 in mdnblocks (reln=0x0, forknum=MAIN_FORKNUM) at
md.c:768
#2 0x000055e5c85eb61b in mdimmedsync (reln=0x0,
forknum=forknum(at)entry=MAIN_FORKNUM)
at md.c:930
#3 0x000055e5c85ec6e5 in smgrimmedsync (reln=<optimized out>,
forknum=forknum(at)entry=MAIN_FORKNUM) at smgr.c:662
#4 0x000055e5c81ae28b in end_heap_rewrite (state=state(at)entry=0x55e5ca5d1d70)
at rewriteheap.c:342
#5 0x000055e5c81a32ea in heapam_relation_copy_for_cluster
(OldHeap=0x7f212ce41ba0, NewHeap=0x7f212ce41058, OldIndex=<optimized out>,
use_sort=<optimized out>, OldestXmin=<optimized out>,
xid_cutoff=<optimized out>, multi_cutoff=0x7ffcba6ebe64,
num_tuples=0x7ffcba6ebe68, tups_vacuumed=0x7ffcba6ebe70,
tups_recently_dead=0x7ffcba6ebe78) at heapam_handler.c:984
#6 0x000055e5c82f218a in table_relation_copy_for_cluster
(tups_recently_dead=0x7ffcba6ebe78, tups_vacuumed=0x7ffcba6ebe70,
num_tuples=0x7ffcba6ebe68, multi_cutoff=0x7ffcba6ebe64,
xid_cutoff=0x7ffcba6ebe60, OldestXmin=<optimized out>,
use_sort=<optimized out>, OldIndex=0x7f212ce40670, NewTable=0x7f212ce41058,
OldTable=0x7f212ce41ba0)
at ../../../src/include/access/tableam.h:1656
#7 copy_table_data (pCutoffMulti=<synthetic pointer>,
pFreezeXid=<synthetic pointer>, pSwapToastByContent=<synthetic pointer>,
verbose=<optimized out>, OIDOldIndex=<optimized out>,
OIDOldHeap=16384, OIDNewHeap=<optimized out>) at cluster.c:908
#8 rebuild_relation (verbose=<optimized out>, indexOid=<optimized out>,
OldHeap=<optimized out>) at cluster.c:604
#9 cluster_rel (tableOid=<optimized out>, indexOid=<optimized out>,
params=<optimized out>) at cluster.c:427
#10 0x000055e5c82f2b7f in cluster (pstate=pstate(at)entry=0x55e5ca5315c0,
stmt=stmt(at)entry=0x55e5ca510368, isTopLevel=isTopLevel(at)entry=true) at
cluster.c:195
#11 0x000055e5c85fcbc6 in standard_ProcessUtility (pstmt=0x55e5ca510430,
queryString=0x55e5ca50f850 "CLUSTER public.sm_5_323_table;",
context=PROCESS_UTILITY_TOPLEVEL, params=0x0,
queryEnv=0x0, dest=0x55e5ca510710, qc=0x7ffcba6ec340) at utility.c:822
#12 0x000055e5c85fd436 in ProcessUtility (pstmt=pstmt(at)entry=0x55e5ca510430,
queryString=<optimized out>, context=context(at)entry=PROCESS_UTILITY_TOPLEVEL,
params=<optimized out>,
queryEnv=<optimized out>, dest=dest(at)entry=0x55e5ca510710,
qc=0x7ffcba6ec340) at utility.c:525
#13 0x000055e5c85f6148 in PortalRunUtility (portal=portal(at)entry=0x55e5ca570d70,
pstmt=pstmt(at)entry=0x55e5ca510430, isTopLevel=isTopLevel(at)entry=true,
setHoldSnapshot=setHoldSnapshot(at)entry=false,
dest=dest(at)entry=0x55e5ca510710,
qc=qc(at)entry=0x7ffcba6ec340) at pquery.c:1159
#14 0x000055e5c85f71a4 in PortalRunMulti (portal=portal(at)entry=0x55e5ca570d70,
isTopLevel=isTopLevel(at)entry=true, setHoldSnapshot=setHoldSnapshot(at)entry=false,

dest=dest(at)entry=0x55e5ca510710, altdest=altdest(at)entry=0x55e5ca510710,
qc=qc(at)entry=0x7ffcba6ec340) at pquery.c:1305
#15 0x000055e5c85f8823 in PortalRun (portal=portal(at)entry=0x55e5ca570d70,
count=count(at)entry=9223372036854775807, isTopLevel=isTopLevel(at)entry=true,
run_once=run_once(at)entry=true,
dest=dest(at)entry=0x55e5ca510710, altdest=altdest(at)entry=0x55e5ca510710,
qc=0x7ffcba6ec340) at pquery.c:779
#16 0x000055e5c85f389e in exec_simple_query (query_string=0x55e5ca50f850
"CLUSTER public.sm_5_323_table;") at postgres.c:1185
#17 0x000055e5c85f51cf in PostgresMain (argc=argc(at)entry=1,
argv=argv(at)entry=0x7ffcba6ec670,
dbname=<optimized out>, username=<optimized out>) at postgres.c:4415
#18 0x000055e5c8522240 in BackendRun (port=<optimized out>, port=<optimized
out>) at postmaster.c:4470
#19 BackendStartup (port=<optimized out>) at postmaster.c:4192
#20 ServerLoop () at postmaster.c:1737
#21 0x000055e5c85237ec in PostmasterMain (argc=<optimized out>,
argv=0x55e5ca508fe0) at postmaster.c:1409
#22 0x000055e5c811a2cf in main (argc=3, argv=0x55e5ca508fe0) at main.c:209

Thanks.
--
Regards,
Neha Sharma