[LLVMbugs] [Bug 9634] New: likely improper segfault

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Tue Apr 5 23:48:49 PDT 2011


           Summary: likely improper segfault
           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

This program, as far as I can tell, should not crash.

regehr at home:~/volatile/bugs/tmp011$ clang -Os small.c -o small
regehr at home:~/volatile/bugs/tmp011$ ./small
Segmentation fault
regehr at home:~/volatile/bugs/tmp011$ clang -v
clang version 3.0 (trunk 128982)
Target: i386-pc-linux-gnu
Thread model: posix
regehr at home:~/volatile/bugs/tmp011$ cat small.c
extern int printf (const char *, ...);

int g_58;
int *g_116;

short func_82 (void);
short func_82 (void)
  short l_87[9];
  int i;
  for (i = 0; i < 9; i++) l_87[i] = 0xDCDEL;
  return l_87[6];

int main (void)
  int p_45;
  for (p_45 = 0; p_45 < 4; p_45++)
      g_116 = &g_58;
      *g_116 |= func_82 ();
  printf ("checksum = 0\n");
  return 0;

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