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<base href="https://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - clang crashes on valid code on x86_64-linux-gnu with message "Unknown mismatch""
href="https://llvm.org/bugs/show_bug.cgi?id=26588">26588</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>clang crashes on valid code on x86_64-linux-gnu with message "Unknown mismatch"
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>LLVM Codegen
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>helloqirun@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The current clang trunk crashes when compiling the following test case on
x86_64-linux-gnu in both 32-bit and 64-bit modes.
It crashes every release starting from 2.9 (I do not have earlier versions
available on my machine).
It might be related to <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - llc crashes instead of giving an error message when inline assembly references an illegal register"
href="show_bug.cgi?id=26353">bug 26353</a>.
$ clang-trunk -v
clang version 3.9.0 (trunk 260639)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.3.0
Found candidate GCC installation:
/usr/local/bin/../lib/gcc/x86_64-unknown-linux-gnu/5.3.0
Selected GCC installation:
/usr/local/bin/../lib/gcc/x86_64-unknown-linux-gnu/5.3.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Selected multilib: .;@m64
$ clang-trunk abc.c
Unknown mismatch!
UNREACHABLE executed at
/home/absozero/trunk/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp:236!
#0 0x0000000002d8f867 llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/absozero/trunk/root-clang/bin/clang-3.9+0x2d8f867)
#1 0x0000000002d8fbe4 PrintStackTraceSignalHandler(void*)
(/home/absozero/trunk/root-clang/bin/clang-3.9+0x2d8fbe4)
#2 0x0000000002d8e275 llvm::sys::RunSignalHandlers()
(/home/absozero/trunk/root-clang/bin/clang-3.9+0x2d8e275)
#3 0x0000000002d8f2b4 SignalHandler(int)
(/home/absozero/trunk/root-clang/bin/clang-3.9+0x2d8f2b4)
#4 0x00007f0450c1f340 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x10340)
#5 0x00007f044fdd1cc9 gsignal
/build/buildd/eglibc-2.19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0
#6 0x00007f044fdd50d8 abort /build/buildd/eglibc-2.19/stdlib/abort.c:91:0
#7 0x0000000002d2e336 bindingsErrorHandler(void*,
std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >
const&, bool) (/home/absozero/trunk/root-clang/bin/clang-3.9+0x2d2e336)
#8 0x0000000003672d56 getCopyFromParts(llvm::SelectionDAG&, llvm::SDLoc,
llvm::SDValue const*, unsigned int, llvm::MVT, llvm::EVT, llvm::Value const*,
llvm::ISD::NodeType) (/home/absozero/trunk/root-clang/bin/clang-3.9+0x3672d56)
#9 0x0000000003676955 llvm::RegsForValue::getCopyFromRegs(llvm::SelectionDAG&,
llvm::FunctionLoweringInfo&, llvm::SDLoc, llvm::SDValue&, llvm::SDValue*,
llvm::Value const*) const
(/home/absozero/trunk/root-clang/bin/clang-3.9+0x3676955)
#10 0x000000000369edb0
llvm::SelectionDAGBuilder::visitInlineAsm(llvm::ImmutableCallSite)
(/home/absozero/trunk/root-clang/bin/clang-3.9+0x369edb0)
#11 0x000000000369ade7 llvm::SelectionDAGBuilder::visitCall(llvm::CallInst
const&) (/home/absozero/trunk/root-clang/bin/clang-3.9+0x369ade7)
#12 0x00000000036788a0 llvm::SelectionDAGBuilder::visit(unsigned int,
llvm::User const&) (/home/absozero/trunk/root-clang/bin/clang-3.9+0x36788a0)
#13 0x000000000367829a llvm::SelectionDAGBuilder::visit(llvm::Instruction
const&) (/home/absozero/trunk/root-clang/bin/clang-3.9+0x367829a)
#14 0x000000000370752d
llvm::SelectionDAGISel::SelectBasicBlock(llvm::ilist_iterator<llvm::Instruction
const>, llvm::ilist_iterator<llvm::Instruction const>, bool&)
(/home/absozero/trunk/root-clang/bin/clang-3.9+0x370752d)
#15 0x000000000370a68e
llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&)
(/home/absozero/trunk/root-clang/bin/clang-3.9+0x370a68e)
#16 0x00000000037065e4
llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&)
(/home/absozero/trunk/root-clang/bin/clang-3.9+0x37065e4)
#17 0x00000000020e43b7 (anonymous
namespace)::X86DAGToDAGISel::runOnMachineFunction(llvm::MachineFunction&)
(/home/absozero/trunk/root-clang/bin/clang-3.9+0x20e43b7)
#18 0x00000000025b1c53
llvm::MachineFunctionPass::runOnFunction(llvm::Function&)
(/home/absozero/trunk/root-clang/bin/clang-3.9+0x25b1c53)
#19 0x00000000028d3c0d llvm::FPPassManager::runOnFunction(llvm::Function&)
(/home/absozero/trunk/root-clang/bin/clang-3.9+0x28d3c0d)
#20 0x00000000028d3d84 llvm::FPPassManager::runOnModule(llvm::Module&)
(/home/absozero/trunk/root-clang/bin/clang-3.9+0x28d3d84)
#21 0x00000000028d40d1 (anonymous
namespace)::MPPassManager::runOnModule(llvm::Module&)
(/home/absozero/trunk/root-clang/bin/clang-3.9+0x28d40d1)
#22 0x00000000028d479f llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/absozero/trunk/root-clang/bin/clang-3.9+0x28d479f)
#23 0x00000000028d49ab llvm::legacy::PassManager::run(llvm::Module&)
(/home/absozero/trunk/root-clang/bin/clang-3.9+0x28d49ab)
#24 0x0000000002f82e74 (anonymous
namespace)::EmitAssemblyHelper::EmitAssembly(clang::BackendAction,
llvm::raw_pwrite_stream*)
(/home/absozero/trunk/root-clang/bin/clang-3.9+0x2f82e74)
#25 0x0000000002f82f49 clang::EmitBackendOutput(clang::DiagnosticsEngine&,
clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions
const&, llvm::StringRef, llvm::Module*, clang::BackendAction,
llvm::raw_pwrite_stream*)
(/home/absozero/trunk/root-clang/bin/clang-3.9+0x2f82f49)
#26 0x00000000037c7496
clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&)
(/home/absozero/trunk/root-clang/bin/clang-3.9+0x37c7496)
#27 0x000000000403f9b9 clang::ParseAST(clang::Sema&, bool, bool)
(/home/absozero/trunk/root-clang/bin/clang-3.9+0x403f9b9)
#28 0x000000000342404f clang::ASTFrontendAction::ExecuteAction()
(/home/absozero/trunk/root-clang/bin/clang-3.9+0x342404f)
#29 0x00000000037ca35c clang::CodeGenAction::ExecuteAction()
(/home/absozero/trunk/root-clang/bin/clang-3.9+0x37ca35c)
#30 0x0000000003423ae5 clang::FrontendAction::Execute()
(/home/absozero/trunk/root-clang/bin/clang-3.9+0x3423ae5)
#31 0x00000000033dc47d
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/home/absozero/trunk/root-clang/bin/clang-3.9+0x33dc47d)
#32 0x000000000351d601
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/home/absozero/trunk/root-clang/bin/clang-3.9+0x351d601)
#33 0x0000000001630c6b cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/home/absozero/trunk/root-clang/bin/clang-3.9+0x1630c6b)
#34 0x0000000001627a13 ExecuteCC1Tool(llvm::ArrayRef<char const*>,
llvm::StringRef) (/home/absozero/trunk/root-clang/bin/clang-3.9+0x1627a13)
#35 0x000000000162849b main
(/home/absozero/trunk/root-clang/bin/clang-3.9+0x162849b)
#36 0x00007f044fdbcec5 __libc_start_main
/build/buildd/eglibc-2.19/csu/libc-start.c:321:0
#37 0x0000000001623d89 _start
(/home/absozero/trunk/root-clang/bin/clang-3.9+0x1623d89)
Stack dump:
0. Program arguments: /home/absozero/trunk/root-clang/bin/clang-3.9 -cc1
-triple x86_64-unknown-linux-gnu -emit-obj -mrelax-all -disable-free
-main-file-name abc.c -mrelocation-model static -mthread-model posix
-mdisable-fp-elim -fmath-errno -masm-verbose -mconstructor-aliases
-munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info
-debugger-tuning=gdb -resource-dir
/home/absozero/trunk/root-clang/bin/../lib/clang/3.9.0 -internal-isystem
/usr/local/include -internal-isystem
/home/absozero/trunk/root-clang/bin/../lib/clang/3.9.0/include
-internal-externc-isystem /usr/include/x86_64-linux-gnu
-internal-externc-isystem /include -internal-externc-isystem /usr/include
-fdebug-compilation-dir /home/absozero/projects/reduction/crash -ferror-limit
19 -fmessage-length 142 -fobjc-runtime=gcc -fdiagnostics-show-option
-fcolor-diagnostics -o /tmp/abc-05243d.o -x c abc.c
1. <eof> parser at end of file
2. Code generation
3. Running pass 'Function Pass Manager' on module 'abc.c'.
4. Running pass 'X86 DAG->DAG Instruction Selection' on function '@fn1'
clang-3.9: error: unable to execute command: Aborted (core dumped)
clang-3.9: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 3.9.0 (trunk 260639)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
clang-3.9: note: diagnostic msg: PLEASE submit a bug report to
<a href="http://llvm.org/bugs/">http://llvm.org/bugs/</a> and include the crash backtrace, preprocessed source, and
associated run script.
clang-3.9: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-3.9: note: diagnostic msg: /tmp/abc-f765fa.c
clang-3.9: note: diagnostic msg: /tmp/abc-f765fa.sh
clang-3.9: note: diagnostic msg:
********************
------
$ cat abc.c
int a;
void fn1() { __asm("" : "+y"(a)); }</pre>
</div>
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