janl commented on PR #5507:
URL: https://github.com/apache/couchdb/pull/5507#issuecomment-2815266331
My local testing box (macOS 16.4.1/latest, arm64) with OTP-28-rc3 makes this
test fail:
```
module 'chttpd_socket_buffer_size_test'
chttpd socket_buffer_size_test
chttpd_socket_buffer_size_test:67: -default_buffer/2-fun-1-...[0.023 s]
ok
chttpd_socket_buffer_size_test:51: -small_recbuf/2-fun-1-...*failed*
in function chttpd_socket_buffer_size_test:'-small_recbuf/2-fun-1-'/1
(test/eunit/chttpd_socket_buffer_size_test.erl, line 54)
in call from eunit_test:run_testfun/1 (eunit_test.erl, line 83)
in call from eunit_proc:run_test/1 (eunit_proc.erl, line 554)
in call from eunit_proc:with_timeout/3 (eunit_proc.erl, line 379)
in call from eunit_proc:handle_test/2 (eunit_proc.erl, line 537)
in call from eunit_proc:tests_inorder/3 (eunit_proc.erl, line 479)
in call from eunit_proc:with_timeout/3 (eunit_proc.erl, line 369)
in call from eunit_proc:run_group/2 (eunit_proc.erl, line 593)
**error:{assert,[{module,chttpd_socket_buffer_size_test},
{line,54},
{expression,"Response =:= 400 orelse Response =:= request_failed"},
{expected,true},
{value,false}]}
output:<<"">>
```
In the logs, the expected-to-fail request shows a 201:
```
[notice] 2025-04-18T10:09:29.375779Z nonode@nohost <0.639.0> 8925f5c766
127.0.0.1:60869 127.0.0.1 chttpd_db_socket_buffer_size_test_admin PUT
/eunit-test-db-145c735070a4bad74540e819cebb134e/xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
201 ok 17
```
The [relevant test
bits](https://github.com/apache/couchdb/blob/f997e718a52d501072fcbe7f0c700520bf428ec8/src/chttpd/test/eunit/chttpd_socket_buffer_size_test.erl#L43-L55)
are just:
```
{"[{recbuf, 1024}]", fun small_recbuf/2},
```
```
small_recbuf(_, {_, Db}) ->
{timeout, 30,
?_test(begin
Id = data(2048),
Response = put_req(url(Db) ++ "/" ++ Id, "{}"),
?assert(Response =:= 400 orelse Response =:= request_failed)
end)}.
```
I couldn’t find anything obvious in our or the OTP commits that could cause
this.
The test passes with OTP-25 and -27 and -28-rc2.
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