[LLVMbugs] [Bug 10222] New: llc -O0 crash somehow due to debug info

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=10222

           Summary: llc -O0 crash somehow due to debug info
           Product: new-bugs
           Version: 2.9
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: baldrick at free.fr
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=6798)
 --> (http://llvm.org/bugs/attachment.cgi?id=6798)
testcase .ll

$ llc -O0 921206-1.ll
...
3  llc       0x0000000000cc8394
__gnu_cxx::new_allocator<llvm::MachineBasicBlock*>::construct(llvm::MachineBasicBlock**,
llvm::MachineBasicBlock* const&) + 52
4  llc       0x0000000000cc79de std::vector<llvm::MachineBasicBlock*,
std::allocator<llvm::MachineBasicBlock*> >::push_back(llvm::MachineBasicBlock*
const&) + 64
5  llc       0x0000000001103b18
llvm::MachineBasicBlock::addSuccessor(llvm::MachineBasicBlock*, unsigned int) +
194

Here llc runs out of memory because it is trying to push an infinite number
of basic block successors into the vector.

I don't see how debug info could be causing this, but if you strip debug info
then the problem goes away.

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