[LLVMbugs] [Bug 13943] New: null deref in RegisterCoalescer::eliminateDeadDefs / LiveRangeEdit::allUsesAvailableAt
bugzilla-daemon at llvm.org
bugzilla-daemon at llvm.org
Thu Sep 27 06:59:55 PDT 2012
http://llvm.org/bugs/show_bug.cgi?id=13943
Bug #: 13943
Summary: null deref in RegisterCoalescer::eliminateDeadDefs /
LiveRangeEdit::allUsesAvailableAt
Product: libraries
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Common Code Generator Code
AssignedTo: unassignedbugs at nondot.org
ReportedBy: kcc at google.com
CC: llvmbugs at cs.uiuc.edu
Classification: Unclassified
test by csmith+creduce
clang r164773, 64-bit linux
//=================================
a;
b;
c;
***d;
e;
f;
void
fn1 () {
int *g[] = { 0, &a, 0, 0, 0, 0, 0, 0, 0 };
for (;; c) {
int **h = &g[6];
fn2 (0);
d = 0;
fn3 (e & f == (*h = g[1]) );
if (b)
return;
}
}
//=================================
clang x.c -c -w -O1
Program received signal SIGSEGV, Segmentation fault.
0x0000000000d0e64c in
llvm::LiveRangeEdit::allUsesAvailableAt(llvm::MachineInstr const*,
llvm::SlotIndex, llvm::SlotIndex) ()
(gdb) bt
#0 0x0000000000d0e64c in
llvm::LiveRangeEdit::allUsesAvailableAt(llvm::MachineInstr const*,
llvm::SlotIndex, llvm::SlotIndex) ()
#1 0x0000000000d0ec65 in llvm::LiveRangeEdit::foldAsLoad(llvm::LiveInterval*,
llvm::SmallVectorImpl<llvm::MachineInstr*>&) ()
#2 0x0000000000d0fa00 in
llvm::LiveRangeEdit::eliminateDeadDefs(llvm::SmallVectorImpl<llvm::MachineInstr*>&,
llvm::ArrayRef<unsigned int>) ()
#3 0x0000000000c621f9 in (anonymous
namespace)::RegisterCoalescer::eliminateDeadDefs() ()
#4 0x0000000000c66867 in (anonymous
namespace)::RegisterCoalescer::joinCopy(llvm::MachineInstr*, bool&) ()
#5 0x0000000000c67e53 in (anonymous
namespace)::RegisterCoalescer::copyCoalesceInMBB(llvm::MachineBasicBlock*) ()
#6 0x0000000000c68663 in (anonymous
namespace)::RegisterCoalescer::runOnMachineFunction(llvm::MachineFunction&) ()
#7 0x0000000001060a39 in llvm::FPPassManager::runOnFunction(llvm::Function&)
()
#8 0x0000000001060ad3 in llvm::FPPassManager::runOnModule(llvm::Module&) ()
#9 0x000000000106069e in llvm::MPPassManager::runOnModule(llvm::Module&) ()
#10 0x00000000010607ad in llvm::PassManagerImpl::run(llvm::Module&) ()
#11 0x000000000114d5a8 in clang::EmitBackendOutput(clang::DiagnosticsEngine&,
clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions
const&, llvm::Module*, clang::BackendAction, llvm::raw_ostream*) ()
#12 0x000000000114ac7c in
clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) ()
#13 0x00000000013cbf2e in clang::ParseAST(clang::Sema&, bool, bool) ()
#14 0x0000000001149a13 in clang::CodeGenAction::ExecuteAction() ()
#15 0x000000000131dc39 in clang::FrontendAction::Execute() ()
#16 0x00000000012fac81 in
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) ()
#17 0x000000000112def4 in
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) ()
#18 0x000000000063aef8 in cc1_main(char const**, char const**, char const*,
void*) ()
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