[llvm-bugs] [Bug 41695] New: 'Memory SSA' pass crashes with "opt -jump-threading -gvn -loop-unswitch -loop-rotate -structurizecfg -licm -ipsccp -loop-extract-single -gvn -inline -early-cse-memssa"

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41695

            Bug ID: 41695
           Summary: 'Memory SSA' pass crashes with "opt -jump-threading
                    -gvn -loop-unswitch -loop-rotate -structurizecfg -licm
                    -ipsccp -loop-extract-single -gvn -inline
                    -early-cse-memssa"
           Product: libraries
           Version: 8.0
          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 21860
  --> https://bugs.llvm.org/attachment.cgi?id=21860&action=edit
.bc file of the source code

$clang -v
clang version 8.0.0 (tags/RELEASE_800/final)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir:
/home/jack-zhou/clang+llvm-8.0.0-x86_64-linux-gnu-ubuntu-18.04/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 -o small.bc

$opt -jump-threading -gvn -loop-unswitch -loop-rotate -structurizecfg -licm
-ipsccp -loop-extract-single -gvn -inline -early-cse-memssa small.bc -o
small-opt.bc
Stack dump:
0.      Program arguments:
/home/jack-zhou/clang+llvm-8.0.0-x86_64-linux-gnu-ubuntu-18.04/bin/opt
-jump-threading -gvn -loop-unswitch -loop-rotate -structurizecfg -licm -ipsccp
-loop-extract-single -gvn -inline -early-cse-memssa small.bc -o small-opt.bc 
1.      Running pass 'CallGraph Pass Manager' on module 'small.bc'.
2.      Running pass 'Memory SSA' on function '@e'
 #0 0x0000000001da98f4 PrintStackTraceSignalHandler(void*)
(/home/jack-zhou/clang+llvm-8.0.0-x86_64-linux-gnu-ubuntu-18.04/bin/opt+0x1da98f4)
 #1 0x0000000001da781e llvm::sys::RunSignalHandlers()
(/home/jack-zhou/clang+llvm-8.0.0-x86_64-linux-gnu-ubuntu-18.04/bin/opt+0x1da781e)
 #2 0x0000000001da9cf8 SignalHandler(int)
(/home/jack-zhou/clang+llvm-8.0.0-x86_64-linux-gnu-ubuntu-18.04/bin/opt+0x1da9cf8)
 #3 0x00007fde53658890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
 #4 0x00000000013329cf llvm::BasicAAResult::aliasCheck(llvm::Value const*,
llvm::LocationSize, llvm::AAMDNodes, llvm::Value const*, llvm::LocationSize,
llvm::AAMDNodes, llvm::Value const*, llvm::Value const*)
(/home/jack-zhou/clang+llvm-8.0.0-x86_64-linux-gnu-ubuntu-18.04/bin/opt+0x13329cf)
 #5 0x00000000013328b8 llvm::BasicAAResult::alias(llvm::MemoryLocation const&,
llvm::MemoryLocation const&)
(/home/jack-zhou/clang+llvm-8.0.0-x86_64-linux-gnu-ubuntu-18.04/bin/opt+0x13328b8)
 #6 0x000000000131d9af llvm::AAResults::alias(llvm::MemoryLocation const&,
llvm::MemoryLocation const&)
(/home/jack-zhou/clang+llvm-8.0.0-x86_64-linux-gnu-ubuntu-18.04/bin/opt+0x131d9af)
 #7 0x0000000001422510 instructionClobbersQuery(llvm::MemoryDef const*,
llvm::MemoryLocation const&, llvm::Instruction const*, llvm::AAResults&)
(/home/jack-zhou/clang+llvm-8.0.0-x86_64-linux-gnu-ubuntu-18.04/bin/opt+0x1422510)
 #8 0x000000000141d1dc llvm::MemorySSA::OptimizeUses::optimizeUses()
(/home/jack-zhou/clang+llvm-8.0.0-x86_64-linux-gnu-ubuntu-18.04/bin/opt+0x141d1dc)
 #9 0x000000000141bfda llvm::MemorySSA::buildMemorySSA()
(/home/jack-zhou/clang+llvm-8.0.0-x86_64-linux-gnu-ubuntu-18.04/bin/opt+0x141bfda)
#10 0x00000000014206f8
llvm::MemorySSAWrapperPass::runOnFunction(llvm::Function&)
(/home/jack-zhou/clang+llvm-8.0.0-x86_64-linux-gnu-ubuntu-18.04/bin/opt+0x14206f8)
#11 0x00000000018b37da llvm::FPPassManager::runOnFunction(llvm::Function&)
(/home/jack-zhou/clang+llvm-8.0.0-x86_64-linux-gnu-ubuntu-18.04/bin/opt+0x18b37da)
#12 0x0000000001369994 (anonymous
namespace)::CGPassManager::runOnModule(llvm::Module&)
(/home/jack-zhou/clang+llvm-8.0.0-x86_64-linux-gnu-ubuntu-18.04/bin/opt+0x1369994)
#13 0x00000000018b40df llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/jack-zhou/clang+llvm-8.0.0-x86_64-linux-gnu-ubuntu-18.04/bin/opt+0x18b40df)
#14 0x00000000007e0bb1 main
(/home/jack-zhou/clang+llvm-8.0.0-x86_64-linux-gnu-ubuntu-18.04/bin/opt+0x7e0bb1)
#15 0x00007fde520e5b97 __libc_start_main
/build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0
#16 0x00000000007cac0a _start
(/home/jack-zhou/clang+llvm-8.0.0-x86_64-linux-gnu-ubuntu-18.04/bin/opt+0x7cac0a)
Segmentation fault (core dumped)

---------------------------------------------
int a, b, c;
int *d;
int e(int f, int g) {
h:
  for (a = 0; 0;)
    ;
  if (g) {
    b = 0;
    for (; b != 2;) {
      *d = c;
      if (d) {
        int i[0];
        if (f)
          if (a)
            goto h;
      }
    }
  }
}

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