Prepare v1.48.0

[Darksonn]

1.48.0 (October 14th, 2025)

The MSRV is increased to 1.71.

Added

• fs: add File::max_buf_size (#7594)
• io: export Chain of AsyncReadExt::chain (#7599)
• net: add SocketAddr::as_abstract_name (#7491)
• net: add TcpStream::quickack and TcpStream::set_quickack (#7490)
• net: implement AsRef<Self> for TcpStream and UnixStream (#7573)
• task: add LocalKey::try_get (#7666)
• task: implement Ord for task::Id (#7530)

Changed

• deps: bump windows-sys to version 0.61 (#7645)
• fs: preserve max_buf_size when cloning a File (#7593)
• macros: suppress clippy::unwrap_in_result in #[tokio::main] (#7651)
• net: remove PollEvented noise from Debug formats (#7675)
• process: upgrade Command::spawn_with to use FnOnce (#7511)
• sync: remove inner mutex in SetOnce (#7554)
• sync: use UnsafeCell::get_mut in Mutex::get_mut and RwLock::get_mut (#7569)
• time: reduce the generated code size of Timeout<T>::poll (#7535)

Fixed

• macros: fix hygiene issue in join! and try_join! (#7638)
• net: fix copy/paste errors in udp peek methods (#7604)
• process: fix error when runtime is shut down on nightly-2025-10-12 (#7672)
• runtime: use release ordering in wake_by_ref() even if already woken (#7622)
• sync: close the broadcast::Sender in broadcast::Sender::new() (#7629)
• sync: fix implementation of unused RwLock::try_* methods (#7587)

Unstable

• tokio: use cargo features instead of --cfg flags for taskdump and io_uring (#7655, #7621)
• fs: support io_uring in fs::write (#7567)
• fs: support io_uring with File::open() (#7617)
• fs: support io_uring with OpenOptions (#7321)
• macros: add local runtime flavor (#7375, #7597)

Documented

• io: clarify the zero capacity case of AsyncRead::poll_read (#7580)
• io: fix typos in the docs of AsyncFd readiness guards (#7583)
• net: clarify socket gets closed on drop (#7526)
• net: clarify the behavior of UCred::pid() on Cygwin (#7611)
• net: clarify the supported platform of set_reuseport() and reuseport() (#7628)
• net: qualify that SO_REUSEADDR is only set on Unix (#7533)
• runtime: add guide for choosing between runtime types (#7635)
• runtime: clarify the behavior of Handle::block_on (#7665)
• runtime: clarify the edge case of Builder::global_queue_interval() (#7605)
• sync: clarify bounded channel panic behavior (#7641)
• sync: clarify the behavior of tokio::sync::watch::Receiver (#7584)
• sync: document cancel safety on SetOnce::wait (#7506)
• sync: fix the docs of parking_lot feature flag (#7663)
• sync: improve the docs of UnboundedSender::send (#7661)
• sync: improve the docs of sync::watch (#7601)
• sync: reword allocation failure paragraph in broadcast docs (#7595)
• task: clarify the behavior of several spawn_local methods (#7669)
• task: clarify the task ID reuse guarantees (#7577)
• task: improve the example of poll_proceed (#7586)

[Darksonn]

Depends on #7676.

[seanmonstar]

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