[LLVMbugs] [Bug 9017] New: Assertion `New != this && "this->replaceAllUsesWith(this) is NOT valid!"' failed.

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=9017

           Summary: Assertion `New != this &&
                    "this->replaceAllUsesWith(this) is NOT valid!"'
                    failed.
           Product: new-bugs
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: regehr at cs.utah.edu
                CC: llvmbugs at cs.uiuc.edu, chenyang at cs.utah.edu


regehr at home:~/volatile/bugs/tmp349$ clang -O2 -c small.c
clang: Value.cpp:312: void llvm::Value::replaceAllUsesWith(llvm::Value*):
Assertion `New != this && "this->replaceAllUsesWith(this) is NOT valid!"'
failed.
0  clang 0x09498118
Stack dump:
0.    Program arguments:
/mnt/z/z/compiler-install/llvm-gcc-r123968-install/bin/clang -cc1 -triple
i386-pc-linux-gnu -emit-obj -disable-free -main-file-name small.c
-mrelocation-model static -mdisable-fp-elim -masm-verbose -mconstructor-aliases
-target-cpu pentium4 -target-linker-version 2.20.51 -resource-dir
/mnt/z/z/compiler-install/llvm-gcc-r123968-install/bin/../lib/clang/2.9 -O2
-ferror-limit 19 -fmessage-length 80 -fgnu-runtime -fdiagnostics-show-option
-fcolor-diagnostics -o small.o -x c small.c 
1.    <eof> parser at end of file
2.    Per-module optimization passes
3.    Running pass 'CallGraph Pass Manager' on module 'small.c'.
4.    Running pass 'Scalar Replacement of Aggregates (SSAUp)' on function
'@int322'
clang: error: unable to execute command: Aborted
clang: error: clang frontend command failed due to signal 1 (use -v to see
invocation)

regehr at home:~/volatile/bugs/tmp349$ clang -v

clang version 2.9 (trunk 123968)
Target: i386-pc-linux-gnu
Thread model: posix

regehr at home:~/volatile/bugs/tmp349$ cat small.c


int g_85;

int func_75 (void)
{
 lbl_95:
  g_85 ^= 0;
  goto lbl_95;
}

int *func_80 (int **p_82)
{
  return *p_82;
}

void int322 (void)
{
  int l_34;
  int *l_72 = &l_34;
  if (func_75 ())
    for (;;)
      {
    int **l_144 = &l_72;
    *l_144 = func_80 (&l_72);
      }
}

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