This probably means the server terminated abnormally

Hi Team,

I am facing unexpected termination on different processes:

2026-02-04 11:47:27.282318 CST,"myuser","mydb",p570503,th1268955328,"10.10.247.124","58584",2026-02-04 04:34:59 CST,0,con2459,cmd1,seg-1,,,,sx1,"ERROR","58M01","Error on receive from seg0 10.10.247.122:50000 pid=570505: server closed the connection unexpectedly
This probably means the server terminated abnormally
before or while processing the request.",,,,,,"set optimizer=off",0,,"cdbdispatchresult.c",510,"Stack trace:
1 0x7f1a4d50d918 libpostgres.so errstart + 0x258
2 0x7f1a4d513676 libpostgres.so ThrowErrorData + 0x16
3 0x7f1a4d590a15 libpostgres.so CdbDispatchSetCommand + 0x285
4 0x7f1a4d52ea03 libpostgres.so + 0x4d52ea03
5 0x7f1a4d52f017 libpostgres.so ExecSetVariableStmt + 0x4c7
6 0x7f1a4d3c2392 libpostgres.so standard_ProcessUtility + 0xb02
7 0x7f1a4d3c27a3 libpostgres.so ProcessUtility + 0x113
8 0x7f1a4d3c0185 libpostgres.so + 0x4d3c0185
9 0x7f1a4d3c02ab libpostgres.so + 0x4d3c02ab
10 0x7f1a4d3c08b3 libpostgres.so PortalRun + 0x2a3
11 0x7f1a4d3bd826 libpostgres.so PostgresMain + 0x1556
12 0x7f1a4d31c5f0 libpostgres.so + 0x4d31c5f0
13 0x7f1a4d31d5f3 libpostgres.so PostmasterMain + 0xe03
14 0x4027db postgres main + 0x56b
15 0x7f1a4c62a610 libc.so.6 + 0x4c62a610
16 0x7f1a4c62a6c0 libc.so.6 __libc_start_main + 0x80
17 0x402975 postgres _start + 0x25

Kindly can you support me in this regard.

The report points to cdbdispatchresult.c:510 and the ExecSetVariableStmt path, with the failing command shown as set optimizer=off. Start by reproducing that command with the reported segment setup and inspect the segment/server logs. Done means identifying the cause of the abnormal termination and verifying that the command no longer closes the connection.

Written by the indexing model from the issue text.