[llvm-bugs] [Bug 26364] New: Segmentation fault at -Os and above on x86_64-linux-gnu in 32-bit and 64-bit modes

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=26364

            Bug ID: 26364
           Summary: Segmentation fault at -Os and above on
                    x86_64-linux-gnu in 32-bit and 64-bit modes
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: chengniansun at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

The following code causes a segmentation fault in clang-trunk at -Os and above
on x86_64-linux-gnu in 32-bit and 64-bit modes.


$: clang-trunk -v
clang version 3.9.0 (trunk 258958)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.3.0
Found candidate GCC installation:
/usr/local/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.6.3
Found candidate GCC installation:
/usr/local/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.7.4
Found candidate GCC installation:
/usr/local/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.8.2
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$: 
$: clang-trunk -Os small.c
small.c:20:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^
small.c:22:29: warning: control reaches end of non-void function
[-Wreturn-type]
static short fn2() { fn1(); }
                            ^
clang-3.9: error: unable to execute command: Segmentation fault (core dumped)
clang-3.9: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 3.9.0 (trunk 258958)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
clang-3.9: note: diagnostic msg: PLEASE submit a bug report to
http://llvm.org/bugs/ and include the crash backtrace, preprocessed source, and
associated run script.
clang-3.9: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-3.9: note: diagnostic msg: /tmp/small-8cb392.c
clang-3.9: note: diagnostic msg: /tmp/small-8cb392.sh
clang-3.9: note: diagnostic msg: 

********************
$: clang-trunk -O2 small.c
small.c:20:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^
small.c:22:29: warning: control reaches end of non-void function
[-Wreturn-type]
static short fn2() { fn1(); }
                            ^
clang-3.9: error: unable to execute command: Segmentation fault (core dumped)
clang-3.9: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 3.9.0 (trunk 258958)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
clang-3.9: note: diagnostic msg: PLEASE submit a bug report to
http://llvm.org/bugs/ and include the crash backtrace, preprocessed source, and
associated run script.
clang-3.9: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-3.9: note: diagnostic msg: /tmp/small-f9ae95.c
clang-3.9: note: diagnostic msg: /tmp/small-f9ae95.sh
clang-3.9: note: diagnostic msg: 

********************
$: clang-trunk -O3 small.c
small.c:20:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^
small.c:22:29: warning: control reaches end of non-void function
[-Wreturn-type]
static short fn2() { fn1(); }
                            ^
clang-3.9: error: unable to execute command: Segmentation fault (core dumped)
clang-3.9: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 3.9.0 (trunk 258958)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
clang-3.9: note: diagnostic msg: PLEASE submit a bug report to
http://llvm.org/bugs/ and include the crash backtrace, preprocessed source, and
associated run script.
clang-3.9: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-3.9: note: diagnostic msg: /tmp/small-4ba728.c
clang-3.9: note: diagnostic msg: /tmp/small-4ba728.sh
clang-3.9: note: diagnostic msg: 

********************
$: 
$: cat small.c
static int a;
int b;
int c;
int d;
static int fn1() {
  int k;
  for (; b;) {
    int e = 1;
    for (; c;) {
      for (; d;) {
        e = k = 0;
        for (; k < 8; k++)
          ;
        break;
      }
      e &= c;
      short f = k;
    }
  }
}

static short fn2() { fn1(); }

int main() {
  a = 8;
  for (; a == 3;)
    fn2();
  return 0;
}
$:

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