[19.1.0] clangd crashes while running boost-use-ranges clang-tidy check

[xb284524239]

My Environment：

OS: Windows 10
LLVM Version: 19.1.0 (include clangd、clang-tidy、clang++, etc.)
CMake Version: 3.30.3 
IDE: VSCode

Problem Description:
I have found after multiple attempts that when I configure the .clang-tidy file in the root directory of my project, the Clang Language Server frequently crashes to the point of being completely unusable. However, when I delete the .clang-tidy file, everything returns to normal.

The .clang-tidy file:

Checks: "
        *,
        -llvmlibc-*,
        -fuchsia-*,
"

[EugeneZelenko]

@xb284524239: Could you please try to run Clang-tidy standalone? Just to narrow down source of problem.

[xb284524239]

@xb284524239: Could you please try to run Clang-tidy standalone? Just to narrow down source of problem.

PS C:\Users\paul> clang-tidy --version
LLVM (http://llvm.org/):
  LLVM version 19.1.0
  Optimized build.
PS C:\Users\paul>

@EugeneZelenko Hello, I usually use it via VSCode. Could you please tell me how to use Clang-tidy standalone?

[EugeneZelenko]

See https://clang.llvm.org/extra/clang-tidy/. There is also run-clang-tidy script to run on compile database (could be generated by CMake).

[EugeneZelenko]

run-clang-tidy deals with compile database.

[xb284524239]

I would like to add that a few days ago, when I was using version 18.1.8 of LLVM, the Clang Language Server did not crash. The frequent crashes only started after I upgraded LLVM to version 19.1.0. Perhaps this information could be helpful in troubleshooting the problem.

run-clang-tidy:

PS C:\Workspace\VSCode_Workspace\Test004> python "C:\Program Files\LLVM\bin\run-clang-tidy" -p "./build"
Enabled checks:
    abseil-cleanup-ctad
    abseil-duration-addition
    abseil-duration-comparison
    abseil-duration-conversion-cast
    abseil-duration-division
    abseil-duration-factory-float
    abseil-duration-factory-scale
    abseil-duration-subtraction
    abseil-duration-unnecessary-conversion
    abseil-faster-strsplit-delimiter
    abseil-no-internal-dependencies
    abseil-no-namespace
    abseil-redundant-strcat-calls
    abseil-str-cat-append
    abseil-string-find-startswith
    abseil-string-find-str-contains
    abseil-time-comparison
    abseil-time-subtraction
    abseil-upgrade-duration-conversions
    altera-id-dependent-backward-branch
    altera-kernel-name-restriction
    altera-single-work-item-barrier
    altera-struct-pack-align
    altera-unroll-loops
    android-cloexec-accept
    android-cloexec-accept4
    android-cloexec-creat
    android-cloexec-dup
    android-cloexec-epoll-create
    android-cloexec-epoll-create1
    android-cloexec-fopen
    android-cloexec-inotify-init
    android-cloexec-inotify-init1
    android-cloexec-memfd-create
    android-cloexec-open
    android-cloexec-pipe
    android-cloexec-pipe2
    android-cloexec-socket
    android-comparison-in-temp-failure-retry
    boost-use-ranges
    boost-use-to-string
    bugprone-argument-comment
    bugprone-assert-side-effect
    bugprone-assignment-in-if-condition
    bugprone-bad-signal-to-kill-thread
    bugprone-bool-pointer-implicit-conversion
    bugprone-branch-clone
    bugprone-casting-through-void
    bugprone-chained-comparison
    bugprone-compare-pointer-to-member-virtual-function
    bugprone-copy-constructor-init
    bugprone-crtp-constructor-accessibility
    bugprone-dangling-handle
    bugprone-dynamic-static-initializers
    bugprone-easily-swappable-parameters
    bugprone-empty-catch
    bugprone-exception-escape
    bugprone-fold-init-type
    bugprone-forward-declaration-namespace
    bugprone-forwarding-reference-overload
    bugprone-implicit-widening-of-multiplication-result
    bugprone-inaccurate-erase
    bugprone-inc-dec-in-conditions
    bugprone-incorrect-enable-if
    bugprone-incorrect-roundings
    bugprone-infinite-loop
    bugprone-integer-division
    bugprone-lambda-function-name
    bugprone-macro-parentheses
    bugprone-macro-repeated-side-effects
    bugprone-misplaced-operator-in-strlen-in-alloc
    bugprone-misplaced-pointer-arithmetic-in-alloc
    bugprone-misplaced-widening-cast
    bugprone-move-forwarding-reference
    bugprone-multi-level-implicit-pointer-conversion
    bugprone-multiple-new-in-one-expression
    bugprone-multiple-statement-macro
    bugprone-narrowing-conversions
    bugprone-no-escape
    bugprone-non-zero-enum-to-bool-conversion
    bugprone-not-null-terminated-result
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    bugprone-parent-virtual-call
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    bugprone-posix-return
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    bugprone-sizeof-expression
    bugprone-spuriously-wake-up-functions
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    bugprone-string-constructor
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    bugprone-string-literal-with-embedded-nul
    bugprone-stringview-nullptr
    bugprone-suspicious-enum-usage
    bugprone-suspicious-include
    bugprone-suspicious-memory-comparison
    bugprone-suspicious-memset-usage
    bugprone-suspicious-missing-comma
    bugprone-suspicious-realloc-usage
    bugprone-suspicious-semicolon
    bugprone-suspicious-string-compare
    bugprone-suspicious-stringview-data-usage
    bugprone-swapped-arguments
    bugprone-switch-missing-default-case
    bugprone-terminating-continue
    bugprone-throw-keyword-missing
    bugprone-too-small-loop-variable
    bugprone-unchecked-optional-access
    bugprone-undefined-memory-manipulation
    bugprone-undelegated-constructor
    bugprone-unhandled-exception-at-new
    bugprone-unhandled-self-assignment
    bugprone-unique-ptr-array-mismatch
    bugprone-unsafe-functions
    bugprone-unused-local-non-trivial-variable
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    clang-analyzer-optin.performance.GCDAntipattern
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    clang-analyzer-optin.portability.UnixAPI
    clang-analyzer-optin.taint.TaintedAlloc
    clang-analyzer-osx.API
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    clang-analyzer-osx.NumberObjectConversion
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    clang-analyzer-osx.ObjCProperty
    clang-analyzer-osx.SecKeychainAPI
    clang-analyzer-osx.cocoa.AtSync
    clang-analyzer-osx.cocoa.AutoreleaseWrite
    clang-analyzer-osx.cocoa.ClassRelease
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    clang-analyzer-osx.cocoa.IncompatibleMethodTypes
    clang-analyzer-osx.cocoa.Loops
    clang-analyzer-osx.cocoa.MissingSuperCall
    clang-analyzer-osx.cocoa.NSAutoreleasePool
    clang-analyzer-osx.cocoa.NSError
    clang-analyzer-osx.cocoa.NilArg
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    clang-analyzer-osx.coreFoundation.CFError
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    clang-analyzer-osx.coreFoundation.containers.OutOfBounds
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    clang-analyzer-security.FloatLoopCounter
    clang-analyzer-security.PutenvStackArray
    clang-analyzer-security.SetgidSetuidOrder
    clang-analyzer-security.cert.env.InvalidPtr
    clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling
    clang-analyzer-security.insecureAPI.SecuritySyntaxChecker
    clang-analyzer-security.insecureAPI.UncheckedReturn
    clang-analyzer-security.insecureAPI.bcmp
    clang-analyzer-security.insecureAPI.bcopy
    clang-analyzer-security.insecureAPI.bzero
    clang-analyzer-security.insecureAPI.decodeValueOfObjCType
    clang-analyzer-security.insecureAPI.getpw
    clang-analyzer-security.insecureAPI.gets
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    clang-analyzer-security.insecureAPI.rand
    clang-analyzer-security.insecureAPI.strcpy
    clang-analyzer-security.insecureAPI.vfork
    clang-analyzer-unix.API
    clang-analyzer-unix.BlockInCriticalSection
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    clang-analyzer-unix.Stream
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    concurrency-mt-unsafe
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    cppcoreguidelines-init-variables
    cppcoreguidelines-interfaces-global-init
    cppcoreguidelines-macro-to-enum
    cppcoreguidelines-macro-usage
    cppcoreguidelines-misleading-capture-default-by-value
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    google-readability-avoid-underscore-in-googletest-name
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Running clang-tidy for 2 files out of 2 in compilation database ...
[1/2][0.1s] C:\Program Files\LLVM\bin\clang-tidy.EXE -p=./build C:\Workspace\VSCode_Workspace\Test004\main.cpp
C:\Workspace\VSCode_Workspace\Test004\main.cpp:23:5: warning: use a trailing return type for this function [modernize-use-trailing-return-type]
   23 | int main(int argc, char** argv) {
      | ~~~ ^
      | auto                            -> int
C:\Workspace\VSCode_Workspace\Test004\main.cpp:23:14: warning: parameter 'argc' is unused [misc-unused-parameters]
   23 | int main(int argc, char** argv) {
      |              ^~~~
      |               /*argc*/
C:\Workspace\VSCode_Workspace\Test004\main.cpp:23:27: warning: parameter 'argv' is unused [misc-unused-parameters]
   23 | int main(int argc, char** argv) {
      |                           ^~~~
      |                            /*argv*/
4 warnings generated.
Suppressed 1 warnings (1 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.

[2/2][18.4s] C:\Program Files\LLVM\bin\clang-tidy.EXE -p=./build C:\Workspace\VSCode_Workspace\Test004\test.cpp
93662 warnings generated.
Suppressed 93662 warnings (93662 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.

PS C:\Workspace\VSCode_Workspace\Test004>

[xb284524239]

@EugeneZelenko
Hello Sir,

After multiple tests, I have finally identified the cause of the Clang Language Server crashes. The specific reasons are as follows:

1. The following .clang-tidy configuration file causes the Clang Language Server to crash:

Checks: "
        *
"

2. The following .clang-tidy configuration file does not cause the Clang Language Server to crash:

Checks: "
        *,
        -boost-use-ranges
"

The only difference between the two configuration files is that the second one includes an additional -boost-use-ranges configuration. Therefore, I suspect that there is a bug in clang-tidy.exe when handling the boost-use-ranges check, which leads to the Clang Language Server crashing.

By the way, my project is a very simple Hello-World-level demo and does not use the Boost library. If needed, I can send you my demo code (for testing purposes).

[llvmbot]

@llvm/issue-subscribers-clang-tidy

Author: Paul Xu (xb284524239)

``` My Environment：

OS: Windows 10
LLVM Version: 19.1.0 (include clangd、clang-tidy、clang++, etc.)
CMake Version: 3.30.3
IDE: VSCode

Problem Description:
I have found after multiple attempts that when I configure the `.clang-tidy` file in the root directory of my project, the Clang Language Server frequently crashes to the point of being completely unusable. However, when I delete the `.clang-tidy` file, everything returns to normal.


The `.clang-tidy` file: 

Checks: "
,
-llvmlibc-,
-fuchsia-*,
"

![bbb](https://github.com/user-attachments/assets/640c6803-42aa-47d0-9784-41d51323a181)

![20240920111639](https://github.com/user-attachments/assets/07cd7050-0e65-4f7f-87dc-7714818e46e5)

</details>

[EugeneZelenko]

@xb284524239: Please provide reproducer. https://godbolt.org should be helpful.

[xb284524239]

@EugeneZelenko

Hello, here is my demo code, and I have recorded a video to reproduce the issue. In my video, there is only one check item in the .clang-tidy file: boost-use-ranges. If I delete this check item or modify it to -boost-use-ranges, then the Clang Language Server will not crash.

# CMakeLists.txt

cmake_minimum_required(VERSION 3.30)
project(Test006 VERSION 0.1.0 LANGUAGES C CXX)
add_executable(Test006 main.cpp test.cpp)

// main.cpp

#include "test.h"
int main(int, char **) { test(); }

// test.h

#pragma once
void test();

// test.cpp

#include "test.h"
#include <iostream>
void test() {
  std::cout << "Hello, I'm only use for testing clang-tidy!" << std::endl;
}

// .clang-tidy

Checks: "boost-use-ranges"

6ff8f55f853bc24005a656594593d8ac.mp4

[HighCommander4]

Thank you @xb284524239 for the reduced code example. I can reproduce the crash using this example.

The crash occurs when opening test.cpp, but interestingly, it seems to only happen if test.h has been opened previously.

I have not been able to reproduce the crash with clangd --check=test.cpp, or with clang-tidy on the command line, which suggests that even though the crash is in a clang-tidy checker, it may only occur when the checker is run via clangd.