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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Crash in GetNeonType"
href="https://bugs.llvm.org/show_bug.cgi?id=42775">42775</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Crash in GetNeonType
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>8.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Windows NT
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>dmajor@mozilla.com
</td>
</tr>
<tr>
<th>CC</th>
<td>hans@chromium.org, htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Blocks</th>
<td>42474
</td>
</tr></table>
<p>
<div>
<pre>Clang-cl from the release_90 branch crashes while compiling Firefox for
aarch64-windows.
Unfortunately I couldn't reproduce this locally, it only crashes with Mozilla
automation's clang builds, which don't publish debug symbols. By tracing
execution side-by-side with the crashy build and my own build that has symbols,
I narrowed this down to an unhandled switch case in `GetNeonType`. The
`TypeFlags.Flags` are -1.
Reduced buffer.c:
foo() {
_InterlockedExchangeAdd64(0, -1);
}
Command line from the reproducer script:
"clang-cl.exe" "-cc1" "-triple" "aarch64-unknown-windows-msvc19.16.27026"
"-emit-obj" "-mincremental-linker-compatible" "-disable-free"
"-disable-llvm-verifier" "-discard-value-names" "-main-file-name" "buffer.c"
"-mrelocation-model" "static" "-mthread-model" "posix" "-mdisable-fp-elim"
"-relaxed-aliasing" "-fmath-errno" "-masm-verbose" "-mconstructor-aliases"
"-munwind-tables" "-target-cpu" "generic" "-target-feature" "+neon"
"-target-abi" "aapcs" "-fallow-half-arguments-and-returns" "-D_MT" "-D_DLL"
"--dependent-lib=msvcrt" "--dependent-lib=oldnames" "-stack-protector" "2"
"-fdiagnostics-format" "msvc" "-gcodeview" "-debug-info-kind=limited"
"-ffunction-sections" "-fdata-sections" "-coverage-notes-file"
"z:\\build\\build\\src\\obj-firefox\\media\\ffvpx\\libavutil\\buffer.gcno" "-D"
"DEBUG=1" "-D" "_USE_MATH_DEFINES" "-D" "inline=__inline" "-D"
"HAVE_AV_CONFIG_H" "-D" "ASSERT_LEVEL=2" "-D" "MOZILLA_CLIENT" "-D"
"_HAS_EXCEPTIONS=0" "-O2" "-Wall" "-Wno-unknown-pragmas" "-Wno-ignored-pragmas"
"-Wno-deprecated-declarations" "-Wno-invalid-noreturn" "-Wno-parentheses"
"-Wno-pointer-sign" "-Wno-sign-compare" "-Wno-switch" "-Wno-type-limits"
"-Wno-unused-function" "-Wno-deprecated-declarations" "-Wno-absolute-value"
"-Wno-incompatible-pointer-types" "-Wno-string-conversion" "-Wno-visibility"
"-Wno-inconsistent-dllimport" "-Wno-macro-redefined" "-ferror-limit" "19"
"-fmessage-length" "0" "-fno-use-cxa-atexit" "-fms-extensions"
"-fms-compatibility" "-fms-compatibility-version=19.16.27026"
"-fdelayed-template-parsing" "-fobjc-runtime=gcc" "-fdiagnostics-show-option"
"-vectorize-loops" "-vectorize-slp" "-std=gnu99" "-faddrsig" "-x" "c"
"buffer.c"
Stack (the top frame is actually GetNeonType, the symbols are missing):
00 clang_cl!clang::CodeGen::CodeGenFunction::EmitCommonNeonBuiltinExpr
01 clang_cl!clang::CodeGen::CodeGenFunction::EmitAArch64BuiltinExpr
02 clang_cl!clang::CodeGen::CodeGenFunction::EmitBuiltinExpr
03 clang_cl!clang::CodeGen::CodeGenFunction::EmitCallExpr
04 clang_cl!clang::CodeGen::CodeGenFunction::EmitCheckedInBoundsGEP
05 clang_cl!clang::CodeGen::CodeGenFunction::EmitScalarExpr
06 clang_cl!clang::CodeGen::CodeGenFunction::EmitAnyExpr
07 clang_cl!clang::CodeGen::CodeGenFunction::EmitIgnoredExpr
08 clang_cl!clang::CodeGen::CodeGenFunction::EmitStmt
09 clang_cl!clang::CodeGen::CodeGenFunction::EmitCompoundStmtWithoutScope
0a clang_cl!clang::CodeGen::CodeGenFunction::EmitFunctionBody
0b clang_cl!clang::CodeGen::CodeGenFunction::GenerateCode
0c clang_cl!clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition
0d clang_cl!clang::CodeGen::CodeGenModule::EmitGlobalDefinition
0e clang_cl!clang::CodeGen::CodeGenModule::EmitGlobal
0f clang_cl!clang::CodeGen::CodeGenModule::EmitTopLevelDecl
10 clang_cl!clang::CreateLLVMCodeGen
11 clang_cl!clang::BackendConsumer::HandleTopLevelDecl
12 clang_cl!clang::ParseAST
13 clang_cl!clang::FrontendAction::Execute
14 clang_cl!clang::CompilerInstance::ExecuteAction
15 clang_cl!clang::ExecuteCompilerInvocation
16 clang_cl!clang::ChainedDiagnosticConsumer::HandleDiagnostic
17 clang_cl
18 clang_cl!llvm::itanium_demangle::OutputStream::writeUnsigned
19 KERNEL32!BaseThreadInitThunk
1a ntdll!RtlUserThreadStart</pre>
</div>
</p>
<div id="referenced">
<hr style="border: 1px dashed #969696">
<b>Referenced Bugs:</b>
<ul>
<li>
[<a class="bz_bug_link
bz_status_NEW "
title="NEW - [meta] 9.0.0 Release Blockers"
href="https://bugs.llvm.org/show_bug.cgi?id=42474">Bug 42474</a>] [meta] 9.0.0 Release Blockers
</li>
</ul>
</div>
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