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Tue, 15 Sep 2026 09:42:07 -0700 (PDT) X-Received: by 2002:a05:6402:324f:b0:6a9:a0ab:d470 with SMTP id 4fb4d7f45d1cf-6a9f63d1633mr4354708a12.26.1789490527231; Tue, 15 Sep 2026 09:42:07 -0700 (PDT) MIME-Version: 1.0 From: Max Gilmour <max.gilmour@canonical.com> Date: Tue, 15 Sep 2026 09:41:55 -0700 X-Gm-Features: AcwNN1UPBus-AUwnfw_bwjjMgbW3VV7nH97dMkKEo_jeu1J4h4eT8_r4158qn6o Message-ID: <CALYDzCMQVOaNDtyxD=mxDA5YmGupKe9kRhrRPh=_=BHqAd5MKg@mail.gmail.com> Subject: rust-tracing-core: Niche optimization assumption will fail for newer Rust To: submit@bugs.debian.org Content-Type: multipart/mixed; boundary="00000000000034a8f6065b883b5c" Delivered-To: submit@bugs.debian.org --00000000000034a8f6065b883b5c Content-Type: multipart/alternative; boundary="00000000000034a8f5065b883b5a" --00000000000034a8f5065b883b5a Content-Type: text/plain; charset="UTF-8" Source: rust-tracing-core Version: 0.1.36-1 Severity: normal Tags: patch upstream Dear rust-tracing-core maintainers, Currently, rust-tracing-core assumes that Rust niche optimization[1] remains the same, even though Rust makes no such guarantee. As of Rust 1.97, this hardcoded assumption is no longer true, meaning that the metadata::tests::level_filter_reprs test will break[2]: 167s ---- metadata::tests::level_filter_reprs stdout ---- 167s 167s thread 'metadata::tests::level_filter_reprs' (5315) panicked at src/metadata.rs:1119:13: 167s assertion `left == right` failed: repr changed for LevelFilter::OFF 167s left: 5 167s right: 18446744073709551615 167s stack backtrace: 167s 0: __rustc::rust_begin_unwind 167s at /usr/src/rustc-1.97.1/library/std/src/panicking.rs:689:5 167s 1: core::panicking::panic_fmt 167s at /usr/src/rustc-1.97.1/library/core/src/panicking.rs:80:14 167s 2: core::panicking::assert_failed_inner 167s at /usr/src/rustc-1.97.1/library/core/src/panicking.rs:434:23 167s 3: core::panicking::assert_failed::<usize, usize> 167s at /usr/src/rustc-1.97.1/library/core/src/panicking.rs:394:5 167s 4: tracing_core::metadata::tests::level_filter_reprs 167s at ./src/metadata.rs:1119:13 167s 5: tracing_core::metadata::tests::level_filter_reprs::{closure#0} 167s at ./src/metadata.rs:1102:28 167s 6: <tracing_core::metadata::tests::level_filter_reprs::{closure#0} as core::ops::function::FnOnce<()>>::call_once 167s at /usr/src/rustc-1.97.1/library/core/src/ops/function.rs:250:5 167s 7: <fn() -> core::result::Result<(), alloc::string::String> as core::ops::function::FnOnce<()>>::call_once 167s at /usr/src/rustc-1.97.1/library/core/src/ops/function.rs:250:5 167s note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace. Naturally, this bug will not impact Debian until Rust is updated to 1.97. However, it is affecting Ubuntu and being tracked as LP: #2167368. I have attached a patch which cherry-picks the upstream fix[3]. The fix makes it so the crate works with all Rust versions past the MSRV -- I successfully ran all tests with both 1.93.1 and 1.97.1, and I verified that the package builds against Debian unstable. Please let me know if you need anything else. Best wishes, Max [1]: https://www.0xatticus.com/posts/understanding_rust_niche/ [2]: https://autopkgtest.ubuntu.com/results/autopkgtest-stonking/stonking/amd64/r/rust-tracing-core/20260912_123714_a8bc3@/log.gz [3]: https://github.com/tokio-rs/tracing/pull/3537 --00000000000034a8f5065b883b5a Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr"><p>Source: rust-tracing-core<br>Version: 0.1.36-1<br>Sever= ity: normal<br>Tags: patch upstream<br><br></p><p>Dear rust-tracing-core ma= intainers,</p><p>Currently, rust-tracing-core assumes that Rust niche optim= ization[1] remains the<br> same, even though Rust makes no such guarantee. As of Rust 1.97, this hardc= oded<br> assumption is no longer true, meaning that the metadata::tests::level_filte= r_reprs<br> test will break[2]:</p> <p>167s ---- metadata::tests::level_filter_reprs stdout ----<br> 167s<br> 167s thread 'metadata::tests::level_filter_reprs' (5315) panicked a= t src/metadata.rs:1119:13:<br> 167s assertion `left =3D=3D right` failed: repr changed for LevelFilter::OF= F<br> 167s left: 5<br> 167s right: 18446744073709551615<br> 167s stack backtrace:<br> 167s 0: __rustc::rust_begin_unwind<br> 167s at /usr/src/rustc-1.97.1/library/std/src/panicking.rs:689= :5<br> 167s 1: core::panicking::panic_fmt<br> 167s at /usr/src/rustc-1.97.1/library/core/src/panicking.rs:80= :14<br> 167s 2: core::panicking::assert_failed_inner<br> 167s at /usr/src/rustc-1.97.1/library/core/src/panicking.rs:43= 4:23<br> 167s 3: core::panicking::assert_failed::<usize, usize><br> 167s at /usr/src/rustc-1.97.1/library/core/src/panicking.rs:39= 4:5<br> 167s 4: tracing_core::metadata::tests::level_filter_reprs<br> 167s at ./src/metadata.rs:1119:13<br> 167s 5: tracing_core::metadata::tests::level_filter_reprs::{closure#0}<b= r> 167s at ./src/metadata.rs:1102:28<br> 167s 6: <tracing_core::metadata::tests::level_filter_reprs::{closure#= 0} as core::ops::function::FnOnce<()>>::call_once<br> 167s at /usr/src/rustc-1.97.1/library/core/src/ops/function.rs= :250:5<br> 167s 7: <fn() -> core::result::Result<(), alloc::string::String= > as core::ops::function::FnOnce<()>>::call_once<br> 167s at /usr/src/rustc-1.97.1/library/core/src/ops/function.rs= :250:5<br> 167s note: Some details are omitted, run with `RUST_BACKTRACE=3Dfull` for a= verbose backtrace.</p><p>Naturally, this bug will not impact Debian until = Rust is updated to 1.97. However, it is affecting Ubuntu and being tracked = as LP: #2167368.</p><p>I have attached a patch which cherry-picks the upstr= eam fix[3]. The fix makes it so the crate works with all Rust versions past= the MSRV -- I successfully ran all tests with both 1.93.1 and 1.97.1, and = I verified that the package builds against Debian unstable.</p><p>Please le= t me know if you need anything else.</p><p>Best wishes,</p><p>Max</p><p>[1]= : <a rel=3D"nofollow" href=3D"https://www.0xatticus.com/posts/understanding= _rust_niche/">https://www.0xatticus.com/posts/understanding_rust_niche/</a>= <br> [2]: <a rel=3D"nofollow" href=3D"https://autopkgtest.ubuntu.com/results/aut= opkgtest-stonking/stonking/amd64/r/rust-tracing-core/20260912_123714_a8bc3@= /log.gz">https://autopkgtest.ubuntu.com/results/autopkgtest-stonking/stonki= ng/amd64/r/rust-tracing-core/20260912_123714_a8bc3@/log.gz</a></p><p>[3]:= =C2=A0<a href=3D"https://github.com/tokio-rs/tracing/pull/3537">https://git= hub.com/tokio-rs/tracing/pull/3537</a></p></div> --00000000000034a8f5065b883b5a-- --00000000000034a8f6065b883b5c Content-Type: text/x-patch; charset="US-ASCII"; 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