15beta1 crash on mips64el in pg_regress/triggers

Debian unstable mips64el:

2022-05-18 22:57:34.436 UTC client backend[19222] pg_regress/triggers STATEMENT: drop trigger trg1 on trigpart3;
...
2022-05-18 22:57:39.110 UTC postmaster[7864] LOG: server process (PID 19222) was terminated by signal 11: Segmentation fault
2022-05-18 22:57:39.110 UTC postmaster[7864] DETAIL: Failed process was running: SELECT a.attname,
pg_catalog.format_type(a.atttypid, a.atttypmod),
(SELECT pg_catalog.pg_get_expr(d.adbin, d.adrelid, true)
FROM pg_catalog.pg_attrdef d
WHERE d.adrelid = a.attrelid AND d.adnum = a.attnum AND a.atthasdef),
a.attnotnull,
(SELECT c.collname FROM pg_catalog.pg_collation c, pg_catalog.pg_type t
WHERE c.oid = a.attcollation AND t.oid = a.atttypid AND a.attcollation <> t.typcollation) AS attcollation,
a.attidentity,
a.attgenerated
FROM pg_catalog.pg_attribute a
WHERE a.attrelid = '21816' AND a.attnum > 0 AND NOT a.attisdropped
ORDER BY a.attnum;

******** build/src/test/regress/tmp_check/data/core ********

warning: Can't open file /dev/shm/PostgreSQL.387042440 during file-backed mapping note processing

warning: Can't open file /dev/shm/PostgreSQL.4014890228 during file-backed mapping note processing

warning: Can't open file /dev/zero (deleted) during file-backed mapping note processing

warning: Can't open file /SYSV035e8a2e (deleted) during file-backed mapping note processing
[New LWP 19222]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/mips64el-linux-gnuabi64/libthread_db.so.1".
Core was generated by `postgres: buildd regression [local] SELECT '.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x000000ffd000565c in ?? ()
#0 0x000000ffd000565c in ?? ()
No symbol table info available.
#1 0x000000aaad76b730 in ExecEvalExprSwitchContext (isNull=0xfffb9e85e7, econtext=0xaab20e9f90, state=0xaab20ea108) at ./build/../src/include/executor/executor.h:343
retDatum = <optimized out>
oldContext = 0xaab1fabb10
retDatum = <optimized out>
oldContext = <optimized out>
#2 ExecProject (projInfo=0xaab20ea100) at ./build/../src/include/executor/executor.h:377
econtext = 0xaab20e9f90
state = 0xaab20ea108
slot = 0xaab20ea5b0
isnull = false
#3 ExecScan (node=0xaab20ea100, accessMtd=0xaaad78b6d0 <IndexNext>, recheckMtd=0xaaad78bf08 <IndexRecheck>) at ./build/../src/backend/executor/execScan.c:238
slot = <optimized out>
econtext = <optimized out>
qual = <optimized out>
projInfo = 0xaab20ea100
#4 0x000000aaad76b730 in ExecEvalExprSwitchContext (isNull=0xaab20ea450, econtext=0xaab20e9f90, state=0x1208) at ./build/../src/include/executor/executor.h:343
retDatum = <optimized out>
oldContext = 0xaab20ea6c8
retDatum = <optimized out>
oldContext = <optimized out>
#5 ExecProject (projInfo=0x1200) at ./build/../src/include/executor/executor.h:377
econtext = 0xaab20e9f90
state = 0x1208
slot = 0xaab20ea638
isnull = false
#6 ExecScan (node=0xaab20ea6d0, accessMtd=0xaab20ea6cd, recheckMtd=0xaab20ea310) at ./build/../src/backend/executor/execScan.c:238
slot = <optimized out>
econtext = <optimized out>
qual = <optimized out>
projInfo = 0x1200
#7 0xffffffffffffffff in ?? ()
No symbol table info available.
Backtrace stopped: frame did not save the PC

Full build log:
https://buildd.debian.org/status/fetch.php?pkg=postgresql-15&arch=mips64el&ver=15%7Ebeta1-1&stamp=1652916002&raw=0

Christoph