-Cllvm-args=-fanalyzer reports uses of uninitialized values

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#781 创建于 2025年10月21日 13 条评论 0 个 reaction 已指派 0 人在 GitHub 查看

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难度: 4/5
预计耗时: 3-5 天
新手友好度: 35/100

Issue 类型: 缺陷
描述清晰度: 需要澄清
活跃度: 停滞
技术栈: rust
领域: compilers

调研方向

使用所示的 Box::new(42) 程序和 -Cllvm-args=-fanalyzer 重现该警告，然后通过 rustc_codegen_gcc 构建的 sysroot 文件跟踪报告的路径，包括 core/src/alloc/layout.rs、core/src/ub_checks.rs、alloc/src/alloc.rs 和 alloc/src/boxed.rs。当重现过程不再报告这些未初始化值警告，并且受影响的分配和布局路径具有适当的覆盖率时，即视为完成。

由索引模型根据 Issue 内容生成。

描述

bug

#[unsafe(no_mangle)]
fn main() {
    let _ = Box::new(42);
}

and then compile with -Cllvm-args=-fanalyzer results in

libgccjit.so: warning: : use of uninitialized value 'undefined' [CWE-457] [-Wanalyzer-use-of-uninitialized-value]
  '_ZN4core5alloc6layout6Layout25from_size_align_unchecked17h70ce6625d1a2bfa4E': event 1
    │
    │ (1): entry to '_ZN4core5alloc6layout6Layout25from_size_align_unchecked17h70ce6625d1a2bfa4E'
    │
  '_ZN4core5alloc6layout6Layout25from_size_align_unchecked17h70ce6625d1a2bfa4E': event 2
    │
    │/root/build-rustc-cg-gcc/rustc_codegen_gcc/build/build_sysroot/sysroot_src/library/core/src/ub_checks.rs:78:17:
    │
    └──> '_ZN4core5alloc6layout6Layout25from_size_align_unchecked18precondition_check17h7567f7e907a542e2E': event 3
           │
           │libgccjit.so:
           │ (3): entry to '_ZN4core5alloc6layout6Layout25from_size_align_unchecked18precondition_check17h7567f7e907a542e2E'
           │
         '_ZN4core5alloc6layout6Layout25from_size_align_unchecked18precondition_check17h7567f7e907a542e2E': event 4
           │
           │/root/build-rustc-cg-gcc/rustc_codegen_gcc/build/build_sysroot/sysroot_src/library/core/src/alloc/layout.rs:138:18:
           │
         '_ZN4core5alloc6layout6Layout25from_size_align_unchecked18precondition_check17h7567f7e907a542e2E': event 5
           │
           │/root/build-rustc-cg-gcc/rustc_codegen_gcc/build/build_sysroot/sysroot_src/library/core/src/ub_checks.rs:75:14:
           │
    <──────┘
    │
  '_ZN4core5alloc6layout6Layout25from_size_align_unchecked17h70ce6625d1a2bfa4E': event 6
    │
    │
  '_ZN4core5alloc6layout6Layout25from_size_align_unchecked17h70ce6625d1a2bfa4E': event 7
    │
    │libgccjit.so:
    │ (7): use of uninitialized value 'undefined' here
    │
libgccjit.so: warning: : use of uninitialized value 'undefined' [CWE-457] [-Wanalyzer-use-of-uninitialized-value]
  '_ZN5alloc5alloc15exchange_malloc17h3ccaf01f6c22a3acE': event 1
    │
    │libgccjit.so:
    │ (1): entry to '_ZN5alloc5alloc15exchange_malloc17h3ccaf01f6c22a3acE'
    │
  '_ZN5alloc5alloc15exchange_malloc17h3ccaf01f6c22a3acE': event 2
    │
    │/root/build-rustc-cg-gcc/rustc_codegen_gcc/build/build_sysroot/sysroot_src/library/alloc/src/alloc.rs:351:27:
    │
    └──> '_ZN4core5alloc6layout6Layout25from_size_align_unchecked17h70ce6625d1a2bfa4E': event 3
           │
           │libgccjit.so:
           │ (3): entry to '_ZN4core5alloc6layout6Layout25from_size_align_unchecked17h70ce6625d1a2bfa4E'
           │
         '_ZN4core5alloc6layout6Layout25from_size_align_unchecked17h70ce6625d1a2bfa4E': event 4
           │
           │/root/build-rustc-cg-gcc/rustc_codegen_gcc/build/build_sysroot/sysroot_src/library/core/src/ub_checks.rs:78:17:
           │
           └──> '_ZN4core5alloc6layout6Layout25from_size_align_unchecked18precondition_check17h7567f7e907a542e2E': event 5
                  │
                  │libgccjit.so:
                  │ (5): entry to '_ZN4core5alloc6layout6Layout25from_size_align_unchecked18precondition_check17h7567f7e907a542e2E'
                  │
                '_ZN4core5alloc6layout6Layout25from_size_align_unchecked18precondition_check17h7567f7e907a542e2E': event 6
                  │
                  │/root/build-rustc-cg-gcc/rustc_codegen_gcc/build/build_sysroot/sysroot_src/library/core/src/alloc/layout.rs:138:18:
                  │
                '_ZN4core5alloc6layout6Layout25from_size_align_unchecked18precondition_check17h7567f7e907a542e2E': event 7
                  │
                  │/root/build-rustc-cg-gcc/rustc_codegen_gcc/build/build_sysroot/sysroot_src/library/core/src/ub_checks.rs:75:14:
                  │
           <──────┘
           │
         '_ZN4core5alloc6layout6Layout25from_size_align_unchecked17h70ce6625d1a2bfa4E': event 8
           │
           │
         '_ZN4core5alloc6layout6Layout25from_size_align_unchecked17h70ce6625d1a2bfa4E': event 9
           │
           │libgccjit.so:
           │ (9): use of uninitialized value 'undefined' here
           │
libgccjit.so: warning: : use of uninitialized value 'undefined' [CWE-457] [-Wanalyzer-use-of-uninitialized-value]
  'main': event 1
    │
    │libgccjit.so:
    │ (1): entry to 'main'
    │
  'main': event 2
    │
    │<source>:3:13:
    │    3 |     let _ = Box::new(42);
    │      |             ^
    │      |             |
    │      |             (2) inlined call to '_ZN5alloc5boxed12Box$LT$T$GT$3new17h4d326128f3fc6045E' from 'main'
    │
    └──> '_ZN5alloc5boxed12Box$LT$T$GT$3new17h4d326128f3fc6045E': event 3
           │
           │/root/build-rustc-cg-gcc/rustc_codegen_gcc/build/build_sysroot/sysroot_src/library/alloc/src/boxed.rs:261:16:
           │
         '_ZN5alloc5alloc15exchange_malloc17h3ccaf01f6c22a3acE': event 4
           │
           │libgccjit.so:
           │ (4): entry to '_ZN5alloc5alloc15exchange_malloc17h3ccaf01f6c22a3acE'
           │
         '_ZN5alloc5alloc15exchange_malloc17h3ccaf01f6c22a3acE': event 5
           │
           │/root/build-rustc-cg-gcc/rustc_codegen_gcc/build/build_sysroot/sysroot_src/library/alloc/src/alloc.rs:351:27:
           │
           └──> '_ZN4core5alloc6layout6Layout25from_size_align_unchecked17h70ce6625d1a2bfa4E': event 6
                  │
                  │libgccjit.so:
                  │ (6): entry to '_ZN4core5alloc6layout6Layout25from_size_align_unchecked17h70ce6625d1a2bfa4E'
                  │
                '_ZN4core5alloc6layout6Layout25from_size_align_unchecked17h70ce6625d1a2bfa4E': event 7
                  │
                  │/root/build-rustc-cg-gcc/rustc_codegen_gcc/build/build_sysroot/sysroot_src/library/core/src/ub_checks.rs:78:17:
                  │
                  └──> '_ZN4core5alloc6layout6Layout25from_size_align_unchecked18precondition_check17h7567f7e907a542e2E': event 8
                         │
                         │libgccjit.so:
                         │ (8): entry to '_ZN4core5alloc6layout6Layout25from_size_align_unchecked18precondition_check17h7567f7e907a542e2E'
                         │
                       '_ZN4core5alloc6layout6Layout25from_size_align_unchecked18precondition_check17h7567f7e907a542e2E': event 9
                         │
                         │/root/build-rustc-cg-gcc/rustc_codegen_gcc/build/build_sysroot/sysroot_src/library/core/src/alloc/layout.rs:138:18:
                         │
                       '_ZN4core5alloc6layout6Layout25from_size_align_unchecked18precondition_check17h7567f7e907a542e2E': event 10
                         │
                         │/root/build-rustc-cg-gcc/rustc_codegen_gcc/build/build_sysroot/sysroot_src/library/core/src/ub_checks.rs:75:14:
                         │
                  <──────┘
                  │
                '_ZN4core5alloc6layout6Layout25from_size_align_unchecked17h70ce6625d1a2bfa4E': event 11
                  │
                  │
                '_ZN4core5alloc6layout6Layout25from_size_align_unchecked17h70ce6625d1a2bfa4E': event 12
                  │
                  │libgccjit.so:
                  │ (12): use of uninitialized value 'undefined' here
                  │
libgccjit.so: warning: : use of uninitialized value 'undefined' [CWE-457] [-Wanalyzer-use-of-uninitialized-value]
  '_ZN5alloc5alloc6Global10alloc_impl17h0be00c1c456dfa5cE': events 1-2
/root/build-rustc-cg-gcc/rustc_codegen_gcc/build/build_sysroot/sysroot_src/library/alloc/src/alloc.rs:186:9:
  '_ZN5alloc5alloc6Global10alloc_impl17h0be00c1c456dfa5cE': event 3
libgccjit.so:
 (3): use of uninitialized value 'undefined' here
libgccjit.so: warning: : use of uninitialized value 'undefined' [CWE-457] [-Wanalyzer-use-of-uninitialized-value]
  '_ZN63_$LT$alloc..alloc..Global$u20$as$u20$core..alloc..Allocator$GT$8allocate17h69f42b4c603da6acE': event 1
    │
    │libgccjit.so:
    │ (1): entry to '_ZN63_$LT$alloc..alloc..Global$u20$as$u20$core..alloc..Allocator$GT$8allocate17h69f42b4c603da6acE'
    │
  '_ZN63_$LT$alloc..alloc..Global$u20$as$u20$core..alloc..Allocator$GT$8allocate17h69f42b4c603da6acE': event 2
    │
    │
    └──> '_ZN5alloc5alloc6Global10alloc_impl17h0be00c1c456dfa5cE': event 3
           │
           │libgccjit.so:
           │ (3): entry to '_ZN5alloc5alloc6Global10alloc_impl17h0be00c1c456dfa5cE'
           │
         '_ZN5alloc5alloc6Global10alloc_impl17h0be00c1c456dfa5cE': events 4-5
           │
           │
         '_ZN5alloc5alloc6Global10alloc_impl17h0be00c1c456dfa5cE': event 6
           │
           │libgccjit.so:
           │ (6): use of uninitialized value 'undefined' here
           │
libgccjit.so: warning: : use of uninitialized value 'undefined' [CWE-457] [-Wanalyzer-use-of-uninitialized-value]
  '_ZN4core5alloc6layout6Layout13for_value_raw17hfb84ae9010274903E': event 1
    │
    │libgccjit.so:
    │ (1): entry to '_ZN4core5alloc6layout6Layout13for_value_raw17hfb84ae9010274903E'
    │
  '_ZN4core5alloc6layout6Layout13for_value_raw17hfb84ae9010274903E': event 2
    │
    │/root/build-rustc-cg-gcc/rustc_codegen_gcc/build/build_sysroot/sysroot_src/library/core/src/alloc/layout.rs:224:18:
    │
    └──> '_ZN4core5alloc6layout6Layout25from_size_align_unchecked17h70ce6625d1a2bfa4E': event 3
           │
           │libgccjit.so:
           │ (3): entry to '_ZN4core5alloc6layout6Layout25from_size_align_unchecked17h70ce6625d1a2bfa4E'
           │
         '_ZN4core5alloc6layout6Layout25from_size_align_unchecked17h70ce6625d1a2bfa4E': event 4
           │
           │/root/build-rustc-cg-gcc/rustc_codegen_gcc/build/build_sysroot/sysroot_src/library/core/src/ub_checks.rs:78:17:
           │
           └──> '_ZN4core5alloc6layout6Layout25from_size_align_unchecked18precondition_check17h7567f7e907a542e2E': event 5
                  │
                  │libgccjit.so:
                  │ (5): entry to '_ZN4core5alloc6layout6Layout25from_size_align_unchecked18precondition_check17h7567f7e907a542e2E'
                  │
                '_ZN4core5alloc6layout6Layout25from_size_align_unchecked18precondition_check17h7567f7e907a542e2E': event 6
                  │
                  │/root/build-rustc-cg-gcc/rustc_codegen_gcc/build/build_sysroot/sysroot_src/library/core/src/alloc/layout.rs:138:18:
                  │
                '_ZN4core5alloc6layout6Layout25from_size_align_unchecked18precondition_check17h7567f7e907a542e2E': event 7
                  │
                  │/root/build-rustc-cg-gcc/rustc_codegen_gcc/build/build_sysroot/sysroot_src/library/core/src/ub_checks.rs:75:14:
                  │
           <──────┘
           │
         '_ZN4core5alloc6layout6Layout25from_size_align_unchecked17h70ce6625d1a2bfa4E': event 8
           │
           │
         '_ZN4core5alloc6layout6Layout25from_size_align_unchecked17h70ce6625d1a2bfa4E': event 9
           │
           │libgccjit.so:
           │ (9): use of uninitialized value 'undefined' here
           │
libgccjit.so: warning: : use of uninitialized value 'undefined' [CWE-457] [-Wanalyzer-use-of-uninitialized-value]
  '_ZN72_$LT$alloc..boxed..Box$LT$T$C$A$GT$$u20$as$u20$core..ops..drop..Drop$GT$4drop17h7863c2941af28a7cE': event 1
    │
    │libgccjit.so:
    │ (1): entry to '_ZN72_$LT$alloc..boxed..Box$LT$T$C$A$GT$$u20$as$u20$core..ops..drop..Drop$GT$4drop17h7863c2941af28a7cE'
    │
  '_ZN72_$LT$alloc..boxed..Box$LT$T$C$A$GT$$u20$as$u20$core..ops..drop..Drop$GT$4drop17h7863c2941af28a7cE': event 2
    │
    │/root/build-rustc-cg-gcc/rustc_codegen_gcc/build/build_sysroot/sysroot_src/library/alloc/src/boxed.rs:1652:26:
    │
    └──> '_ZN4core5alloc6layout6Layout13for_value_raw17hfb84ae9010274903E': event 3
           │
           │libgccjit.so:
           │ (3): entry to '_ZN4core5alloc6layout6Layout13for_value_raw17hfb84ae9010274903E'
           │
         '_ZN4core5alloc6layout6Layout13for_value_raw17hfb84ae9010274903E': event 4
           │
           │/root/build-rustc-cg-gcc/rustc_codegen_gcc/build/build_sysroot/sysroot_src/library/core/src/alloc/layout.rs:224:18:
           │
           └──> '_ZN4core5alloc6layout6Layout25from_size_align_unchecked17h70ce6625d1a2bfa4E': event 5
                  │
                  │libgccjit.so:
                  │ (5): entry to '_ZN4core5alloc6layout6Layout25from_size_align_unchecked17h70ce6625d1a2bfa4E'
                  │
                '_ZN4core5alloc6layout6Layout25from_size_align_unchecked17h70ce6625d1a2bfa4E': event 6
                  │
                  │/root/build-rustc-cg-gcc/rustc_codegen_gcc/build/build_sysroot/sysroot_src/library/core/src/ub_checks.rs:78:17:
                  │
                  └──> '_ZN4core5alloc6layout6Layout25from_size_align_unchecked18precondition_check17h7567f7e907a542e2E': event 7
                         │
                         │libgccjit.so:
                         │ (7): entry to '_ZN4core5alloc6layout6Layout25from_size_align_unchecked18precondition_check17h7567f7e907a542e2E'
                         │
                       '_ZN4core5alloc6layout6Layout25from_size_align_unchecked18precondition_check17h7567f7e907a542e2E': event 8
                         │
                         │/root/build-rustc-cg-gcc/rustc_codegen_gcc/build/build_sysroot/sysroot_src/library/core/src/alloc/layout.rs:138:18:
                         │
                       '_ZN4core5alloc6layout6Layout25from_size_align_unchecked18precondition_check17h7567f7e907a542e2E': event 9
                         │
                         │/root/build-rustc-cg-gcc/rustc_codegen_gcc/build/build_sysroot/sysroot_src/library/core/src/ub_checks.rs:75:14:
                         │
                  <──────┘
                  │
                '_ZN4core5alloc6layout6Layout25from_size_align_unchecked17h70ce6625d1a2bfa4E': event 10
                  │
                  │
                '_ZN4core5alloc6layout6Layout25from_size_align_unchecked17h70ce6625d1a2bfa4E': event 11
                  │
                  │libgccjit.so:
                  │ (11): use of uninitialized value 'undefined' here
                  │
libgccjit.so: warning: : use of uninitialized value 'undefined' [CWE-457] [-Wanalyzer-use-of-uninitialized-value]
  '_ZN4core3ptr49drop_in_place$LT$alloc..boxed..Box$LT$i32$GT$$GT$17h2d9920e239d4edd1E': event 1
    │
    │libgccjit.so:
    │ (1): entry to '_ZN4core3ptr49drop_in_place$LT$alloc..boxed..Box$LT$i32$GT$$GT$17h2d9920e239d4edd1E'
    │
  '_ZN4core3ptr49drop_in_place$LT$alloc..boxed..Box$LT$i32$GT$$GT$17h2d9920e239d4edd1E': event 2
    │
    │/root/build-rustc-cg-gcc/rustc_codegen_gcc/build/build_sysroot/sysroot_src/library/core/src/ptr/mod.rs:804:1:
    │
    └──> '_ZN72_$LT$alloc..boxed..Box$LT$T$C$A$GT$$u20$as$u20$core..ops..drop..Drop$GT$4drop17h7863c2941af28a7cE': event 3
           │
           │libgccjit.so:
           │ (3): entry to '_ZN72_$LT$alloc..boxed..Box$LT$T$C$A$GT$$u20$as$u20$core..ops..drop..Drop$GT$4drop17h7863c2941af28a7cE'
           │
         '_ZN72_$LT$alloc..boxed..Box$LT$T$C$A$GT$$u20$as$u20$core..ops..drop..Drop$GT$4drop17h7863c2941af28a7cE': event 4
           │
           │/root/build-rustc-cg-gcc/rustc_codegen_gcc/build/build_sysroot/sysroot_src/library/alloc/src/boxed.rs:1652:26:
           │
           └──> '_ZN4core5alloc6layout6Layout13for_value_raw17hfb84ae9010274903E': event 5
                  │
                  │libgccjit.so:
                  │ (5): entry to '_ZN4core5alloc6layout6Layout13for_value_raw17hfb84ae9010274903E'
                  │
                '_ZN4core5alloc6layout6Layout13for_value_raw17hfb84ae9010274903E': event 6
                  │
                  │/root/build-rustc-cg-gcc/rustc_codegen_gcc/build/build_sysroot/sysroot_src/library/core/src/alloc/layout.rs:224:18:
                  │
                  └──> '_ZN4core5alloc6layout6Layout25from_size_align_unchecked17h70ce6625d1a2bfa4E': event 7
                         │
                         │libgccjit.so:
                         │ (7): entry to '_ZN4core5alloc6layout6Layout25from_size_align_unchecked17h70ce6625d1a2bfa4E'
                         │
                       '_ZN4core5alloc6layout6Layout25from_size_align_unchecked17h70ce6625d1a2bfa4E': event 8
                         │
                         │/root/build-rustc-cg-gcc/rustc_codegen_gcc/build/build_sysroot/sysroot_src/library/core/src/ub_checks.rs:78:17:
                         │
                         └──> '_ZN4core5alloc6layout6Layout25from_size_align_unchecked18precondition_check17h7567f7e907a542e2E': event 9
                                │
                                │libgccjit.so:
                                │ (9): entry to '_ZN4core5alloc6layout6Layout25from_size_align_unchecked18precondition_check17h7567f7e907a542e2E'
                                │
                              '_ZN4core5alloc6layout6Layout25from_size_align_unchecked18precondition_check17h7567f7e907a542e2E': event 10
                                │
                                │/root/build-rustc-cg-gcc/rustc_codegen_gcc/build/build_sysroot/sysroot_src/library/core/src/alloc/layout.rs:138:18:
                                │
                              '_ZN4core5alloc6layout6Layout25from_size_align_unchecked18precondition_check17h7567f7e907a542e2E': event 11
                                │
                                │/root/build-rustc-cg-gcc/rustc_codegen_gcc/build/build_sysroot/sysroot_src/library/core/src/ub_checks.rs:75:14:
                                │
                         <──────┘
                         │
                       '_ZN4core5alloc6layout6Layout25from_size_align_unchecked17h70ce6625d1a2bfa4E': event 12
                         │
                         │
                       '_ZN4core5alloc6layout6Layout25from_size_align_unchecked17h70ce6625d1a2bfa4E': event 13
                         │
                         │libgccjit.so:
                         │ (13): use of uninitialized value 'undefined' here
                         │

simple true UB things like

#[unsafe(no_mangle)]
fn main() {
    unsafe { *core::ptr::null_mut() = 42; }
}

are correctly reported with -Cllvm-args=-fanalyzer -O though, so -fanalyzer is not completely broken:


libgccjit.so: <source>:3:14: warning: : dereference of NULL '0B' [CWE-476] [-Wanalyzer-null-dereference]
  'main': event 1
<source>:3:14:
    3 |     unsafe { *core::ptr::null_mut() = 42; }
      |              ^
      |              |
      |              (1) ⚠️  dereference of NULL '0B'

but something like

#[unsafe(no_mangle)]
fn main() {
    let x = 42;
    let bad_box = unsafe { std::mem::transmute::<&i32, Box<i32>>(&x) };
    drop(bad_box);
}

doesn't get any errors with -Cllvm-args=-fanalyzer -O (likely because __rust_dealloc is not recognized as free function by GCC, while without -O it produces the same warnings about uninitialized values.

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Re-enable -fno-lto test
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rust-lang/rustc_codegen_gcc#993 · 2026年10月8日创建

维护者通常 1 天内回复
Cannot compile sysroot if having a build.build-dir cargo config
可能已有人在做 @GuillaumeGomez 于 8 天前认领。未关闭
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rust-lang/rustc_codegen_gcc#1011 · 1 条评论 · 已指派 1 人 · 2026年10月20日创建

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Enable librsvg tests on Aarch64
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tests

难度 4/5 3-5 天新手友好度 30/100

rust-lang/rustc_codegen_gcc#992 · 2026年10月8日创建

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[AI] Bunch of bugs found by autonomous scanner
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bug

难度 5/5 一周以上新手友好度 35/100

rust-lang/rustc_codegen_gcc#970 · 5 条评论 · 2026年9月2日创建

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Support `#[no_builtin]`
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难度 5/5 一周以上新手友好度 20/100

rust-lang/rustc_codegen_gcc#943 · 2026年8月4日创建

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haowjy/mars-agents#295 · 2026年10月29日创建

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Docs fail to build on macOS with -D warnings (fake_cf link in manguebyte-au)
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bug

难度 1/5 1 小时以内新手友好度 85/100

alessonqueirozdev-hub/manguebyte#28 · 2026年10月29日创建
rivetkit 3.0: HTTP 400 overloaded on node pool upsert is treated as fatal and exits the process
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难度 2/5 1-3 小时新手友好度 78/100

rivet-dev/rivet#5933 · 1 条评论 · 2026年10月29日创建

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verify: the tag build runs the installer step and its symbol checks (nevr-install.exe)
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needs-verification

难度 2/5 1-3 小时新手友好度 72/100

EchoTools/nevr-runtime#1272 · 2026年10月28日创建

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Add a `--skip-readme` option to `gleam new`
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难度 2/5 1-3 小时新手友好度 79/100

gleam-lang/gleam#6458 · 1 个 reaction · 2026年10月28日创建

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