<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/101381>101381</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            clang segfault when printing function candidates for compile error
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            clang
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          Majeux
      </td>
    </tr>
</table>

<pre>
    I ran into a specific compilation error that triggered a segfault in clang when calling a template function with specific arguments. It seems to segfault when trying to output candidates for the function.

Minimum working example:
```cpp
struct A { };

template <typename T, class... Types>
void test(T t, Types... args) { }

int main() {
 test<A, int, A>(A(42), 1, 42);       // Segfault
    return 1;
}
```
I originally encountered it on clang 18.1.6. On Godbolt (https://godbolt.org/z/sbGdaddPb) I found it produces a segfault on 18.1.0 and 17.0.1, but not on 16.0.0.

Not all calls to `test` cause a segfault. The following outputted a diagnostic message as expected:
```cpp
struct A { };

template <typename T, class... Types>
void test(T t, Types... args) { }

int main() {
 test<A, A>(A(42), 42);               // Ok, diagnostic 
    test<A, A, int>(A(42), 42, 1);       // Ok, diagnostic 
    test<A, int, A>(A(42), 1, A(42));    // Ok, diagnostic
 test<A, int, A>(A(42), 1, 42);       // Segfault
    return 1;
}
```

Output:
```
crash.cpp:7:21: error: no matching conversion for functional-style cast from 'int' to 'A'
    7 |     test<A, int, A>(A(42), 1, 42);       // Segfault
      | ^~~~~
crash.cpp:1:8: note: candidate constructor (the implicit copy constructor) not viable: no known conversion from 'int' to 'const A' for 1st argument
    1 | struct A { };
      |        ^
crash.cpp:1:8: note: candidate constructor (the implicit move constructor) not viable: no known conversion from 'int' to 'A' for 1st argument
    1 | struct A { };
 |        ^
crash.cpp:1:8: note: candidate constructor (the implicit default constructor) not viable: requires 0 arguments, but 1 was provided
crash.cpp:7:5: error: no matching function for call to 'test'
 7 |     test<A, int, A>(A(42), 1, 42);       // Segfault
      | ^~~~~~~~~~~~~~~
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0. Program arguments: /usr/lib/llvm-18/bin/clang -cc1 -triple x86_64-pc-linux-gnu -emit-obj -mrelax-all -dumpdir a- -disable-free -clear-ast-before-backend -disable-llvm-
verifier -discard-value-names -main-file-name crash.cpp -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=all -fmath-errno -ffp-contract=on -fno-rounding-math -m
constructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/home/max/Documents/notes/tuple/clang -fcoverage-compil
ation-dir=/home/max/Documents/notes/tuple/clang -resource-dir /usr/lib/llvm-18/lib/clang/18 -internal-isystem /usr/bin/../lib/gcc/x86_64-linux-gnu/14/../../../../include/c++/1
4 -internal-isystem /usr/bin/../lib/gcc/x86_64-linux-gnu/14/../../../../include/x86_64-linux-gnu/c++/14 -internal-isystem /usr/bin/../lib/gcc/x86_64-linux-gnu/14/../../../../i
nclude/c++/14/backward -internal-isystem /usr/lib/llvm-18/lib/clang/18/include -internal-isystem /usr/local/include -internal-isystem /usr/bin/../lib/gcc/x86_64-linux-gnu/14/.
./../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -fdepreca
ted-macro -ferror-limit 19 -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -fcxx-exceptions -fexceptions -fcolor-diagnostics -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/crash
-c0e064.o -x c++ crash.cpp
1.      crash.cpp:7:33: current parser token ')'
2. crash.cpp:6:12: parsing function body 'main'
3.      crash.cpp:6:12: in compound statement ('{}')
 #0 0x00007af6917a103a llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/usr/lib/llvm-18/bin/../lib/libLLVM.so.18.1+0xda103a)
 #1 0x00007af69179f064 llvm::sys::RunSignalHandlers() (/usr/lib/llvm-18/bin/../lib/libLLVM.so.18.1+0xd9f064)
 #2 0x00007af6917a16fb (/usr/lib/llvm-18/bin/../lib/libLLVM.so.18.1+0xda16fb)
 #3 0x00007af690245320 (/lib/x86_64-linux-gnu/libc.so.6+0x45320)
 #4 0x00007af699bcaf4e (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18.1+0x19caf4e)
 #5 0x00007af699b9f8a0 clang::OverloadCandidateSet::NoteCandidates(clang::Sema&, llvm::ArrayRef<clang::Expr*>, llvm::ArrayRef<clang::OverloadCandidate*>, llvm::StringRef, clan
g::SourceLocation) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18.1+0x199f8a0)
 #6 0x00007af699bb3adc clang::OverloadCandidateSet::NoteCandidates(std::pair<clang::SourceLocation, clang::PartialDiagnostic>, clang::Sema&, clang::OverloadCandidateDisplayKin
d, llvm::ArrayRef<clang::Expr*>, llvm::StringRef, clang::SourceLocation, llvm::function_ref<bool (clang::OverloadCandidate&)>) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18.
1+0x19b3adc)
 #7 0x00007af699bb9ca6 (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18.1+0x19b9ca6)
 #8 0x00007af699bb947f clang::Sema::BuildOverloadedCallExpr(clang::Scope*, clang::Expr*, clang::UnresolvedLookupExpr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr
*>, clang::SourceLocation, clang::Expr*, bool, bool) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18.1+0x19b947f)
 #9 0x00007af6998bf5cd clang::Sema::BuildCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*,
 bool, bool) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18.1+0x16bf5cd)
#10 0x00007af6998d92b3 clang::Sema::ActOnCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*)
 (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18.1+0x16d92b3)
#11 0x00007af698ddcaba clang::Parser::ParsePostfixExpressionSuffix(clang::ActionResult<clang::Expr*, true>) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18.1+0xbdcaba)
#12 0x00007af698de0094 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/usr/lib/llvm-18/bin/../lib/li
bclang-cpp.so.18.1+0xbe0094)
#13 0x00007af698dd9b62 clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18.1+0xbd9b62)
#14 0x00007af698dd9a3d clang::Parser::ParseExpression(clang::Parser::TypeCastState) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18.1+0xbd9a3d)
#15 0x00007af698e3c529 clang::Parser::ParseExprStatement(clang::Parser::ParsedStmtContext) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18.1+0xc3c529)
#16 0x00007af698e3a846 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation
*, clang::ParsedAttributes&, clang::ParsedAttributes&) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18.1+0xc3a846)
#17 0x00007af698e3a21f clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/usr/lib/ll
vm-18/bin/../lib/libclang-cpp.so.18.1+0xc3a21f)
#18 0x00007af698e42a90 clang::Parser::ParseCompoundStatementBody(bool) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18.1+0xc42a90)
#19 0x00007af698e43b93 clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18.1+0xc43b93)
#20 0x00007af698e5ec55 clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/usr/li
b/llvm-18/bin/../lib/libclang-cpp.so.18.1+0xc5ec55)
#21 0x00007af698da7f48 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::SourceLocation*, clang::Parser::ForRan
geInit*) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18.1+0xba7f48)
#22 0x00007af698e5dccf clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/usr
/lib/llvm-18/bin/../lib/libclang-cpp.so.18.1+0xc5dccf)
#23 0x00007af698e5d697 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier)
 (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18.1+0xc5d697)
#24 0x00007af698e5c8eb clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/usr/lib/llvm-18/bin/../lib/libcla
ng-cpp.so.18.1+0xc5c8eb)
#25 0x00007af698e5ad5a clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.1
8.1+0xc5ad5a)
#26 0x00007af698d922de clang::ParseAST(clang::Sema&, bool, bool) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18.1+0xb922de)
#27 0x00007af69abf3189 clang::FrontendAction::Execute() (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18.1+0x29f3189)
#28 0x00007af69ab6aa44 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18.1+0x296aa44)
#29 0x00007af69ac6eb1e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18.1+0x2a6eb1e)
#30 0x0000573e9efb1686 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/usr/lib/llvm-18/bin/clang+0x14686)
#31 0x0000573e9efae935 (/usr/lib/llvm-18/bin/clang+0x11935)
#32 0x0000573e9efadae8 clang_main(int, char**, llvm::ToolContext const&) (/usr/lib/llvm-18/bin/clang+0x10ae8)
#33 0x0000573e9efbb8ba main (/usr/lib/llvm-18/bin/clang+0x1e8ba)
#34 0x00007af69022a1ca __libc_start_call_main ./csu/../sysdeps/nptl/libc_start_call_main.h:74:3
#35 0x00007af69022a28b call_init ./csu/../csu/libc-start.c:128:20
#36 0x00007af69022a28b __libc_start_main ./csu/../csu/libc-start.c:347:5
#37 0x0000573e9efab295 _start (/usr/lib/llvm-18/bin/clang+0xe295)
clang: error: unable to execute command: Segmentation fault (core dumped)
clang: error: clang frontend command failed due to signal (use -v to see invocation)
Ubuntu clang version 18.1.6 (++20240518023429+1118c2e05e67-1~exp1~20240518143527.144)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
clang: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang: note: diagnostic msg: /tmp/crash-2fd7d8.cpp
clang: note: diagnostic msg: /tmp/crash-2fd7d8.sh
clang: note: diagnostic msg: 

********************
```

Source and run script:
[crash.zip](https://github.com/user-attachments/files/16445463/crash.zip)

</pre>
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