[LLVMbugs] [Bug 13390] New: Clang segmentation fault

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Wed Jul 18 03:54:20 PDT 2012


             Bug #: 13390
           Summary: Clang segmentation fault
           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: merkil at savhon.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Hi !
The following testcase makes LLVM/Clang as of r160430 segfault (only at -O3).

$ cat segfault.c

int a, b, c;

void func(void)
    int i, j, d = 1, *e = 0;

        for(i = 0; i < 1; i++)
            for(j = 0; j < 1; j++)
                if(b = 0, (d || a) < (i++ ^ (j -= c)))
                    e = 1;

        if(b + i)
            *e = 0;

        d = 0;

$ clang -O3 -w segfault.c
clang: error: unable to execute command: Segmentation fault
clang: error: clang frontend command failed due to signal (use -v to see
clang version 3.2 (trunk 160430)
Target: x86_64-unknown-linux-gnu
Thread model: posix
clang: note: diagnostic msg: PLEASE submit a bug report to
http://llvm.org/bugs/ and include the crash backtrace, preprocessed source, and
associated run script.

This looks like a regression since I can't reproduce it with LLVM/Clang 3.1.
Please let me know if you need anything else !

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