FailedAssertion("prev_first_lsn < cur_txn->first_lsn", File: "reorderbuffer.c", Line: 1173, ...

Hi,

I don't know what happened here, but I my little script that scrapes
for build farm assertion failures hasn't seen this one before now.
It's on a 15 year old macOS release and compiled with 15 year old GCC
version, for some added mystery.

https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=locust&dt=2022-02-12%2022%3A07%3A21

2022-02-13 00:09:52.859 CET [92423:92] pg_regress/replorigin
STATEMENT: SELECT data FROM
pg_logical_slot_get_changes('regression_slot', NULL, NULL,
'include-xids', '0', 'skip-empty-xacts', '1', 'include-sequences',
'0');
TRAP: FailedAssertion("prev_first_lsn < cur_txn->first_lsn", File:
"reorderbuffer.c", Line: 1173, PID: 92423)
0 postgres 0x00592dd0 ExceptionalCondition + 160\\0
1 postgres 0x00391c40
ReorderBufferGetRelids + 304\\0
2 postgres 0x00394794
ReorderBufferAllocate + 1044\\0
3 postgres 0x003834dc heap_decode + 76\\0
4 postgres 0x003829c8
LogicalDecodingProcessRecord + 168\\0
5 postgres 0x0038a1d4
pg_logical_emit_message_text + 1876\\0
6 postgres 0x00241810
ExecMakeTableFunctionResult + 576\\0
7 postgres 0x002576c4
ExecInitFunctionScan + 1444\\0
8 postgres 0x00242140 ExecScan + 896\\0
9 postgres 0x002397cc standard_ExecutorRun + 540\\0
10 postgres 0x00427940
EnsurePortalSnapshotExists + 832\\0
11 postgres 0x00428e84 PortalRun + 644\\0
12 postgres 0x004252e0 pg_plan_queries + 3232\\0
13 postgres 0x00426270 PostgresMain + 3424\\0
14 postgres 0x0036b9ec PostmasterMain + 8060\\0
15 postgres 0x0029f24c main + 1356\\0
16 postgres 0x00002524 start + 68\\0