pg15b1: FailedAssertion("val > base", File: "...src/include/utils/relptr.h", Line: 67, PID: 30485)

./tmp_install/usr/local/pgsql/bin/postgres -D ./src/test/regress/tmp_check/data -c min_dynamic_shared_memory=1MB

TRAP: FailedAssertion("val > base", File: "../../../../src/include/utils/relptr.h", Line: 67, PID: 21912)
./tmp_install/usr/local/pgsql/bin/postgres(ExceptionalCondition+0xa0)[0x55af5c9c463e]
./tmp_install/usr/local/pgsql/bin/postgres(FreePageManagerInitialize+0x94)[0x55af5c9f4478]
./tmp_install/usr/local/pgsql/bin/postgres(dsm_shmem_init+0x87)[0x55af5c841532]
./tmp_install/usr/local/pgsql/bin/postgres(CreateSharedMemoryAndSemaphores+0x8d)[0x55af5c843f30]
./tmp_install/usr/local/pgsql/bin/postgres(+0x41805c)[0x55af5c7c605c]
./tmp_install/usr/local/pgsql/bin/postgres(PostmasterMain+0x959)[0x55af5c7ca8e7]
./tmp_install/usr/local/pgsql/bin/postgres(main+0x229)[0x55af5c70af7f]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7)[0x7f736d6e1b97]
./tmp_install/usr/local/pgsql/bin/postgres(_start+0x2a)[0x55af5c4794fa]

It looks like this may be pre-existing problem exposed by

commit e07d4ddc55fdcf82082950b3eb0cd8f728284c9d
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date:   Sat Mar 26 14:29:29 2022 -0400

    Suppress compiler warning in relptr_store().