JIT: Fix compiler warning from visibility attribute in typedef

[savannahostrowski]

/Users/runner/work/cpython/cpython/Tools/jit/trampoline.c:13:13: warning: 'visibility' attribute ignored [-Wignored-attributes]
13 | typedef DECLARE_TARGET((*jit_func));
| ^
/Users/runner/work/cpython/cpython/Tools/jit/jit.h:11:49: note: expanded from macro 'DECLARE_TARGET'
11 | _Py_CODEUNIT *__attribute__((preserve_none, visibility("hidden"))) \
|

This was introduced in #136528. The DECLARE_TARGET macro includes visibility("hidden"), which is valid for forward declarations but gets ignored when used in a typedef, so the compiler is yelling.

[chris-eibl]

LGTM. Basically the same as my PR #140286 I've just closed since @Fidget-Spinner made me aware of yours :)

Just a suggestion:

[chris-eibl]

Sorry for being such a pain, this is now merely for my understanding and I hope asking this question here is ok:

When playing with the above Godbolt link, I more or less get the same nice output for jit_stencils-x86_64-unknown-linux-gnu.h in WSL:

void
emit_trampoline(
unsigned char *code, unsigned char *data, _PyExecutorObject *executor,
const _PyUOpInstruction *instruction, jit_state *state)
{
// // trampoline.o: file format elf64-x86-64
// // Disassembly of section .text:
// // 0000000000000000 <_JIT_ENTRY>:
// 0: 41 57 pushq %r15
// 2: 41 56 pushq %r14
// 4: 41 55 pushq %r13
// 6: 41 54 pushq %r12
// 8: 53 pushq %rbx
// 9: 49 89 f4 movq %rsi, %r12
// c: 49 89 d5 movq %rdx, %r13
// f: 49 89 ce movq %rcx, %r14
// 12: ff 57 70 callq *0x70(%rdi)
// 15: 5b popq %rbx
// 16: 41 5c popq %r12
// 18: 41 5d popq %r13
// 1a: 41 5e popq %r14
// 1c: 41 5f popq %r15
// 1e: c3 retq
const unsigned char code_body[31] = {
0x41, 0x57, 0x41, 0x56, 0x41, 0x55, 0x41, 0x54,
0x53, 0x49, 0x89, 0xf4, 0x49, 0x89, 0xd5, 0x49,
0x89, 0xce, 0xff, 0x57, 0x70, 0x5b, 0x41, 0x5c,
0x41, 0x5d, 0x41, 0x5e, 0x41, 0x5f, 0xc3,
};
memcpy(code, code_body, sizeof(code_body));
}

whereas on Windows x86_64 I get

void
emit_trampoline(
unsigned char *code, unsigned char *data, _PyExecutorObject *executor,
const _PyUOpInstruction *instruction, jit_state *state)
{
// // trampoline.o: file format coff-x86-64
// // Disassembly of section .text:
// // 0000000000000000 <_JIT_ENTRY>:
// 0: 41 57 pushq %r15
// 2: 41 56 pushq %r14
// 4: 41 55 pushq %r13
// 6: 41 54 pushq %r12
// 8: 56 pushq %rsi
// 9: 57 pushq %rdi
// a: 53 pushq %rbx
// b: 48 81 ec a0 00 00 00 subq $0xa0, %rsp
// 12: 44 0f 29 bc 24 90 00 00 00 movaps %xmm15, 0x90(%rsp)
// 1b: 44 0f 29 b4 24 80 00 00 00 movaps %xmm14, 0x80(%rsp)
// 24: 44 0f 29 6c 24 70 movaps %xmm13, 0x70(%rsp)
// 2a: 44 0f 29 64 24 60 movaps %xmm12, 0x60(%rsp)
// 30: 44 0f 29 5c 24 50 movaps %xmm11, 0x50(%rsp)
// 36: 44 0f 29 54 24 40 movaps %xmm10, 0x40(%rsp)
// 3c: 44 0f 29 4c 24 30 movaps %xmm9, 0x30(%rsp)
// 42: 44 0f 29 44 24 20 movaps %xmm8, 0x20(%rsp)
// 48: 0f 29 7c 24 10 movaps %xmm7, 0x10(%rsp)
// 4d: 0f 29 34 24 movaps %xmm6, (%rsp)
// 51: 49 89 d4 movq %rdx, %r12
// 54: 4d 89 c5 movq %r8, %r13
// 57: 4d 89 ce movq %r9, %r14
// 5a: ff 51 70 callq *0x70(%rcx)
// 5d: 0f 28 34 24 movaps (%rsp), %xmm6
// 61: 0f 28 7c 24 10 movaps 0x10(%rsp), %xmm7
// 66: 44 0f 28 44 24 20 movaps 0x20(%rsp), %xmm8
// 6c: 44 0f 28 4c 24 30 movaps 0x30(%rsp), %xmm9
// 72: 44 0f 28 54 24 40 movaps 0x40(%rsp), %xmm10
// 78: 44 0f 28 5c 24 50 movaps 0x50(%rsp), %xmm11
// 7e: 44 0f 28 64 24 60 movaps 0x60(%rsp), %xmm12
// 84: 44 0f 28 6c 24 70 movaps 0x70(%rsp), %xmm13
// 8a: 44 0f 28 b4 24 80 00 00 00 movaps 0x80(%rsp), %xmm14
// 93: 44 0f 28 bc 24 90 00 00 00 movaps 0x90(%rsp), %xmm15
// 9c: 48 81 c4 a0 00 00 00 addq $0xa0, %rsp
// a3: 5b popq %rbx
// a4: 5f popq %rdi
// a5: 5e popq %rsi
// a6: 41 5c popq %r12
// a8: 41 5d popq %r13
// aa: 41 5e popq %r14
// ac: 41 5f popq %r15
// ae: c3 retq
const unsigned char code_body[175] = {
0x41, 0x57, 0x41, 0x56, 0x41, 0x55, 0x41, 0x54,
0x56, 0x57, 0x53, 0x48, 0x81, 0xec, 0xa0, 0x00,
0x00, 0x00, 0x44, 0x0f, 0x29, 0xbc, 0x24, 0x90,
0x00, 0x00, 0x00, 0x44, 0x0f, 0x29, 0xb4, 0x24,
0x80, 0x00, 0x00, 0x00, 0x44, 0x0f, 0x29, 0x6c,
0x24, 0x70, 0x44, 0x0f, 0x29, 0x64, 0x24, 0x60,
0x44, 0x0f, 0x29, 0x5c, 0x24, 0x50, 0x44, 0x0f,
0x29, 0x54, 0x24, 0x40, 0x44, 0x0f, 0x29, 0x4c,
0x24, 0x30, 0x44, 0x0f, 0x29, 0x44, 0x24, 0x20,
0x0f, 0x29, 0x7c, 0x24, 0x10, 0x0f, 0x29, 0x34,
0x24, 0x49, 0x89, 0xd4, 0x4d, 0x89, 0xc5, 0x4d,
0x89, 0xce, 0xff, 0x51, 0x70, 0x0f, 0x28, 0x34,
0x24, 0x0f, 0x28, 0x7c, 0x24, 0x10, 0x44, 0x0f,
0x28, 0x44, 0x24, 0x20, 0x44, 0x0f, 0x28, 0x4c,
0x24, 0x30, 0x44, 0x0f, 0x28, 0x54, 0x24, 0x40,
0x44, 0x0f, 0x28, 0x5c, 0x24, 0x50, 0x44, 0x0f,
0x28, 0x64, 0x24, 0x60, 0x44, 0x0f, 0x28, 0x6c,
0x24, 0x70, 0x44, 0x0f, 0x28, 0xb4, 0x24, 0x80,
0x00, 0x00, 0x00, 0x44, 0x0f, 0x28, 0xbc, 0x24,
0x90, 0x00, 0x00, 0x00, 0x48, 0x81, 0xc4, 0xa0,
0x00, 0x00, 0x00, 0x5b, 0x5f, 0x5e, 0x41, 0x5c,
0x41, 0x5d, 0x41, 0x5e, 0x41, 0x5f, 0xc3,
};
// 0: '\x00\x00\x00\x00'
// 4: 00 00 00 00
memcpy(code, code_body, sizeof(code_body));
}

which tells me, clang-cl is saving a ton more on the stack here.
Why that big difference? I wouldn't have assumed that from reading https://clang.llvm.org/docs/AttributeReference.html#preserve-none

On X86-64, only RSP and RBP are preserved by the callee. Registers R12, R13, R14, R15, RDI, RSI, RDX, RCX, R8, R9, R11, and RAX now can be used to pass function arguments. Floating-point registers (XMMs/YMMs) still follow the C calling convention.

[chris-eibl]

Oh, I think I've found the answer myself: adding __attribute__((ms_abi)) to the _JIT_ENTRY function results in similar code as in the stencil, so it is just following MS ABI ...

[chris-eibl]

Maybe also restore the comment

 // Note that this is *not* a tail call:

that got lost in #137961? Because it is utterly important that we use jit_func_preserve_none here and not jit_func, because this would result in a tail call.

[miss-islington-app]

Thanks @savannahostrowski for the PR 🌮🎉.. I'm working now to backport this PR to: 3.14.
🐍🍒⛏🤖 I'm not a witch! I'm not a witch!

[miss-islington-app]

Sorry, @savannahostrowski, I could not cleanly backport this to 3.14 due to a conflict.
Please backport using cherry_picker on command line.

cherry_picker 57f4d09a6fcfec229603f644c4254abdded00429 3.14

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot ARM64 macOS 3.x (tier-2) has failed when building commit 57f4d09.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/#/builders/725/builds/12253) and take a look at the build logs.
4. Check if the failure is related to this commit (57f4d09) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/#/builders/725/builds/12253

Summary of the results of the build (if available):

==

Click to see traceback logs

Traceback (most recent call last):
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/test/test_urllib2net.py", line 22, in _retry_thrice
last_exc = e
^^^^^^^^ResourceWarning: unclosed <socket.socket fd=7, family=2, type=1, proto=6, laddr=('192.168.0.101', 61508), raddr=('68.183.26.59', 21)>
Warning -- Unraisable exception
Exception ignored while finalizing socket <socket.socket fd=8, family=2, type=1, proto=6, laddr=('192.168.0.101', 61510), raddr=('68.183.26.59', 21)>:
Traceback (most recent call last):
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/urllib/request.py", line 1546, in ftp_open
fp, retrlen = fw.retrfile(file, type)
~~~~~~~~~~~^^^^^^^^^^^^
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/urllib/request.py", line 1826, in retrfile
conn, retrlen =self.ftp.ntransfercmd(cmd)
~~~~~~~~~~~~~~~~~~~~~^^^^^
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/ftplib.py", line 354, in ntransfercmd
conn = socket.create_connection((host, port), self.timeout,
source_address=self.source_address)
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/socket.py", line 879, in create_connectionraise exceptions[0]
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/socket.py", line 864, in create_connection
sock.connect(sa)
~~~~~~~~~~~~^^^^TimeoutError: [Errno 60] Operation timed out
Traceback (most recent call last):
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/test/test_urllib2net.py", line 22, in _retry_thrice
last_exc = e
^^^^^^^^ResourceWarning: unclosed <socket.socket fd=8, family=2, type=1, proto=6, laddr=('192.168.0.101', 61510), raddr=('68.183.26.59', 21)>
skipped "Resource 'ftp://www.pythontest.net/' is not available"
Traceback (most recent call last):
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/test/test_urllib2net.py", line 22, in _retry_thrice
last_exc = e
^^^^^^^^ResourceWarning: unclosed <socket.socket fd=11, family=2, type=1, proto=6, laddr=('192.168.0.101', 61529), raddr=('68.183.26.59', 21)>
skipped "Resource 'ftp://www.pythontest.net/' is not available"
Traceback (most recent call last):
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/test/support/__init__.py", line 847, in gc_collect
gc.collect()
~~~~~~~~~~^^ResourceWarning: unclosed <socket.socket fd=7, family=2, type=1, proto=6, laddr=('192.168.0.101', 57105), raddr=('68.183.26.59', 21)>
Traceback (most recent call last):
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/test/test_urllib2net.py", line 22, in _retry_thrice
last_exc = e
^^^^^^^^ResourceWarning: unclosed <socket.socket fd=9, family=2, type=1, proto=6, laddr=('192.168.0.101', 61520), raddr=('68.183.26.59', 21)>
Warning -- Unraisable exception
Exception ignored while finalizing socket <socket.socket fd=10, family=2, type=1, proto=6, laddr=('192.168.0.101', 61523), raddr=('68.183.26.59', 21)>:
Traceback (most recent call last):
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/urllib/request.py", line 1546, in ftp_open
fp, retrlen = fw.retrfile(file, type)
~~~~~~~~~~~^^^^^^^^^^^^
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/urllib/request.py", line 1826, in retrfile
conn, retrlen =self.ftp.ntransfercmd(cmd)
~~~~~~~~~~~~~~~~~~~~~^^^^^
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/ftplib.py", line 354, in ntransfercmd
conn = socket.create_connection((host, port), self.timeout,
source_address=self.source_address)
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/socket.py", line 879, in create_connectionraise exceptions[0]
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/socket.py", line 864, in create_connection
sock.connect(sa)
~~~~~~~~~~~~^^^^TimeoutError: [Errno 60] Operation timed out
Traceback (most recent call last):
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/test/test_urllib2net.py", line 22, in _retry_thrice
last_exc = e
^^^^^^^^ResourceWarning: unclosed <socket.socket fd=6, family=2, type=1, proto=6, laddr=('192.168.0.101', 56902), raddr=('68.183.26.59', 21)>
k
Traceback (most recent call last):
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/test/support/__init__.py", line 847, in gc_collect
gc.collect()
~~~~~~~~~~^^ResourceWarning: unclosed <socket.socket fd=7, family=2, type=1, proto=6, laddr=('192.168.0.101', 61512), raddr=('68.183.26.59', 21)>
Warning -- Unraisable exception
Exception ignored while finalizing socket <socket.socket fd=8, family=2, type=1, proto=6, laddr=('192.168.0.101', 61518), raddr=('68.183.26.59', 21)>:
Traceback (most recent call last):
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/test/support/__init__.py", line 847, in gc_collect
gc.collect()
~~~~~~~~~~^^ResourceWarning: unclosed <socket.socket fd=8, family=2, type=1, proto=6, laddr=('192.168.0.101', 61518), raddr=('68.183.26.59', 21)>
Warning -- Unraisable exception
Exception ignored while finalizing socket <socket.socket fd=9, family=2, type=1, proto=6, laddr=('192.168.0.101', 61525), raddr=('68.183.26.59', 21)>:
Traceback (most recent call last):
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/test/support/__init__.py", line 847, in gc_collect
gc.collect()
~~~~~~~~~~^^ResourceWarning: unclosed <socket.socket fd=9, family=2, type=1, proto=6, laddr=('192.168.0.101', 61525), raddr=('68.183.26.59', 21)>
Warning -- Unraisable exception
Exception ignored while finalizing socket <socket.socket fd=10, family=2, type=1, proto=6, laddr=('192.168.0.101', 61531), raddr=('68.183.26.59', 21)>:
Traceback (most recent call last):
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/test/support/__init__.py", line 847, in gc_collect
gc.collect()
~~~~~~~~~~^^ResourceWarning: unclosed <socket.socket fd=10, family=2, type=1, proto=6, laddr=('192.168.0.101', 61531), raddr=('68.183.26.59', 21)>
Traceback (most recent call last):
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/urllib/request.py", line 1546, in ftp_open
fp, retrlen = fw.retrfile(file, type)
~~~~~~~~~~~^^^^^^^^^^^^
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/urllib/request.py", line 1826, in retrfile
conn, retrlen =self.ftp.ntransfercmd(cmd)
~~~~~~~~~~~~~~~~~~~~~^^^^^
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/ftplib.py", line 354, in ntransfercmd
conn = socket.create_connection((host, port), self.timeout,
source_address=self.source_address)
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/socket.py", line 879, in create_connectionraise exceptions[0]
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/socket.py", line 864, in create_connection
sock.connect(sa)
~~~~~~~~~~~~^^^^TimeoutError: [Errno 60] Operation timed out
Traceback (most recent call last):
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/test/test_urllib2net.py", line 22, in _retry_thrice
last_exc = e
^^^^^^^^ResourceWarning: unclosed <socket.socket fd=10, family=2, type=1, proto=6, laddr=('192.168.0.101', 61527), raddr=('68.183.26.59', 21)>
Warning -- Unraisable exception
Exception ignored while finalizing socket <socket.socket fd=11, family=2, type=1, proto=6, laddr=('192.168.0.101', 61529), raddr=('68.183.26.59', 21)>:
Traceback (most recent call last):
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/urllib/request.py", line 1546, in ftp_open
fp, retrlen = fw.retrfile(file, type)
~~~~~~~~~~~^^^^^^^^^^^^
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/urllib/request.py", line 1826, in retrfile
conn, retrlen =self.ftp.ntransfercmd(cmd)
~~~~~~~~~~~~~~~~~~~~~^^^^^
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/ftplib.py", line 354, in ntransfercmd
conn = socket.create_connection((host, port), self.timeout,
source_address=self.source_address)
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/socket.py", line 879, in create_connectionraise exceptions[0]
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/socket.py", line 864, in create_connection
sock.connect(sa)
~~~~~~~~~~~~^^^^TimeoutError: [Errno 60] Operation timed out
Traceback (most recent call last):
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/test/test_urllib2net.py", line 22, in _retry_thrice
last_exc = e
^^^^^^^^ResourceWarning: unclosed <socket.socket fd=10, family=2, type=1, proto=6, laddr=('192.168.0.101', 61523), raddr=('68.183.26.59', 21)>
skipped "Resource 'ftp://www.pythontest.net/' is not available"
Traceback (most recent call last):
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/test/test_urllib2net.py", line 20, in _retry_thricereturn func(*args, **kwargs)
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/urllib/request.py", line 187, in urlopenreturn opener.open(url, data, timeout)
~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/urllib/request.py", line 487, in open
response =self._open(req, data)
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/urllib/request.py", line 504, in _open
result =self._call_chain(self.handle_open, protocol, protocol +'_open', req)
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/urllib/request.py", line 464, in _call_chain
result = func(*args)
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/urllib/request.py", line 1556, in ftp_openraise URLError(f"ftp error: {exp}") from exp
urllib.error.URLError: <urlopen error ftp error: [Errno 60] Operation timed out>
Traceback (most recent call last):
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/test/test_urllib2net.py", line 22, in _retry_thrice
last_exc = e
^^^^^^^^ResourceWarning: unclosed <socket.socket fd=8, family=2, type=1, proto=6, laddr=('192.168.0.101', 61514), raddr=('68.183.26.59', 21)>
Warning -- Unraisable exception
Exception ignored while finalizing socket <socket.socket fd=9, family=2, type=1, proto=6, laddr=('192.168.0.101', 61516), raddr=('68.183.26.59', 21)>:
Traceback (most recent call last):
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/urllib/request.py", line 1546, in ftp_open
fp, retrlen = fw.retrfile(file, type)
~~~~~~~~~~~^^^^^^^^^^^^
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/urllib/request.py", line 1826, in retrfile
conn, retrlen =self.ftp.ntransfercmd(cmd)
~~~~~~~~~~~~~~~~~~~~~^^^^^
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/ftplib.py", line 354, in ntransfercmd
conn = socket.create_connection((host, port), self.timeout,
source_address=self.source_address)
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/socket.py", line 879, in create_connectionraise exceptions[0]
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/socket.py", line 864, in create_connection
sock.connect(sa)
~~~~~~~~~~~~^^^^TimeoutError: [Errno 60] Operation timed out
Traceback (most recent call last):
File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/test/test_urllib2net.py", line 22, in _retry_thrice
last_exc = e
^^^^^^^^ResourceWarning: unclosed <socket.socket fd=9, family=2, type=1, proto=6, laddr=('192.168.0.101', 61516), raddr=('68.183.26.59', 21)>
skipped "Resource 'ftp://www.pythontest.net/' is not available"

[savannahostrowski]

1 - On second thought, I don't think this should be backported as trampoline.c was added in a8d9d94, which first appeared in 3.15.0a1.

2 - The buildbot failure is unrelated.