RE: FW: query pg_stat_ssl hang 100%cpu

(gdb) bt
#0 ensure_record_cache_typmod_slot_exists (typmod=0) at typcache.c:1714
#1 0x000000000091185b in assign_record_type_typmod (tupDesc=<optimized out>, tupDesc(at)entry=0x27bc738) at typcache.c:2001
#2 0x000000000091df03 in internal_get_result_type (funcid=<optimized out>, call_expr=<optimized out>, rsinfo=<optimized out>,
resultTypeId=<optimized out>, resultTupleDesc=0x7ffc9dff8cd0) at funcapi.c:393
#3 0x000000000091e263 in get_expr_result_type (expr=expr(at)entry=0x2792798, resultTypeId=resultTypeId(at)entry=0x7ffc9dff8ccc,
resultTupleDesc=resultTupleDesc(at)entry=0x7ffc9dff8cd0) at funcapi.c:230
#4 0x00000000006a2fa5 in ExecInitFunctionScan (node=node(at)entry=0x273afa8, estate=estate(at)entry=0x269e948, eflags=eflags(at)entry=16)
at nodeFunctionscan.c:370
#5 0x000000000069084e in ExecInitNode (node=node(at)entry=0x273afa8, estate=estate(at)entry=0x269e948, eflags=eflags(at)entry=16)
at execProcnode.c:255
#6 0x000000000068a96d in InitPlan (eflags=16, queryDesc=0x273b2d8) at execMain.c:936
#7 standard_ExecutorStart (queryDesc=0x273b2d8, eflags=16) at execMain.c:263
#8 0x00007f67c2821d5d in pgss_ExecutorStart (queryDesc=0x273b2d8, eflags=<optimized out>) at pg_stat_statements.c:965
#9 0x00000000007fc226 in PortalStart (portal=portal(at)entry=0x26848b8, params=params(at)entry=0x0, eflags=eflags(at)entry=0,
snapshot=snapshot(at)entry=0x0) at pquery.c:514
#10 0x00000000007fa27f in exec_bind_message (input_message=0x7ffc9dff90d0) at postgres.c:1995
#11 PostgresMain (argc=argc(at)entry=1, argv=argv(at)entry=0x7ffc9dff9370, dbname=<optimized out>, username=<optimized out>)
at postgres.c:4552
#12 0x000000000077a4ea in BackendRun (port=<optimized out>, port=<optimized out>) at postmaster.c:4537
#13 BackendStartup (port=<optimized out>) at postmaster.c:4259
#14 ServerLoop () at postmaster.c:1745
#15 0x000000000077b363 in PostmasterMain (argc=argc(at)entry=5, argv=argv(at)entry=0x256abc0) at postmaster.c:1417
#16 0x00000000004fec63 in main (argc=5, argv=0x256abc0) at main.c:209
(gdb) p RecordCacheArrayLen
$3 = 0

-----Original Message-----
From: Thomas Munro <thomas(dot)munro(at)gmail(dot)com>
Sent: Thursday, September 7, 2023 5:31 PM
To: James Pang (chaolpan) <chaolpan(at)cisco(dot)com>
Cc: Michael Paquier <michael(at)paquier(dot)xyz>; PostgreSQL mailing lists <pgsql-bugs(at)lists(dot)postgresql(dot)org>
Subject: Re: FW: query pg_stat_ssl hang 100%cpu

> #0 ensure_record_cache_typmod_slot_exists (typmod=0) at
> typcache.c:1714

Are you able to print out the value of global variable RecordCacheArrayLen? I wonder if this loop in
ensure_record_cache_typmod_slot_exists() is not terminating:

int32 newlen = RecordCacheArrayLen * 2;

while (typmod >= newlen)
newlen *= 2;