[llvm-bugs] [Bug 42275] New: segmentation fault of target program caused by loop-unroll with "opt -sroa -indvars -loop-rotate -simplifycfg -inline -loop-reroll -loop-unroll"

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42275

            Bug ID: 42275
           Summary: segmentation fault of target program caused by
                    loop-unroll with "opt -sroa -indvars -loop-rotate
                    -simplifycfg -inline -loop-reroll -loop-unroll"
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: cszide at 163.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 22098
  --> https://bugs.llvm.org/attachment.cgi?id=22098&action=edit
.bc file of the source code

$clang -v
clang version 9.0.0 (trunk 362492)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.4.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.4.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64

$clang -O3 -c -emit-llvm  -mllvm -disable-llvm-optzns small.c

$opt -sroa -indvars -loop-rotate -simplifycfg -inline -loop-reroll -loop-unroll
small.bc -o small-opt.bc

$clang small-opt.bc -o small.out && ./small.out
Segmentation fault (core dumped)

without loop-unroll pass, the target program is fine.
$opt -sroa -indvars -loop-rotate -simplifycfg -inline -loop-reroll small.bc -o
small-opt1.bc

$clang small-opt1.bc -o small1.out && ./small1.out

--------------------------------
void a() {
  short b[6][2][7];
  int c, d, e;
  for (c = 0; c < 6; c++) {
    for (d = 0; d < 2; d++) {
      for (e = 0; e < 7; e++)
        b[c][d][e] = 1;
    }
  }
}
void main() { a(); }

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