[llvm-bugs] [Bug 43429] New: licm crashes with segmentation fault at llvm::BasicBlock::getModule()

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=43429

            Bug ID: 43429
           Summary: licm crashes with segmentation fault at
                    llvm::BasicBlock::getModule()
           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 22562
  --> https://bugs.llvm.org/attachment.cgi?id=22562&action=edit
.bc file of the source code

$clang -v
clang version 10.0.0 (trunk 372364)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/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 -femit-all-decls -mllvm -disable-llvm-optzns small.c

$opt  -early-cse -simple-loop-unswitch -die -licm small.bc -o small-opt.bc
Stack dump:
0.      Program arguments:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt -early-cse
-simple-loop-unswitch -die -licm small.bc -o small-opt.bc 
1.      Running pass 'Function Pass Manager' on module 'small.bc'.
2.      Running pass 'Loop Pass Manager' on function '@b'
3.      Running pass 'Loop Invariant Code Motion' on basic block '%for.cond'
 #0 0x000056234b9e7dca llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x277adca)
 #1 0x000056234b9e5aa4 llvm::sys::RunSignalHandlers()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x2778aa4)
 #2 0x000056234b9e5be2 SignalHandler(int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x2778be2)
 #3 0x00007fbb43a38890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
 #4 0x000056234b23c700 llvm::BasicBlock::getModule() const
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x1fcf700)
 #5 0x000056234acd6319 llvm::MemoryLocation::get(llvm::LoadInst const*)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x1a69319)
 #6 0x000056234ab967f8 llvm::AliasSetTracker::add(llvm::LoadInst*)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x19297f8)
 #7 0x000056234ab97121
llvm::AliasSetTracker::addAllInstructionsInLoopUsingMSSA()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x192a121)
 #8 0x000056234b7af747 (anonymous
namespace)::LoopInvariantCodeMotion::runOnLoop(llvm::Loop*, llvm::AAResults*,
llvm::LoopInfo*, llvm::DominatorTree*, llvm::TargetLibraryInfo*,
llvm::TargetTransformInfo*, llvm::ScalarEvolution*, llvm::MemorySSA*,
llvm::OptimizationRemarkEmitter*, bool)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x2542747)
 #9 0x000056234b7afd5a (anonymous
namespace)::LegacyLICMPass::runOnLoop(llvm::Loop*, llvm::LPPassManager&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x2542d5a)
#10 0x000056234acba18b llvm::LPPassManager::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x1a4d18b)
#11 0x000056234b3272e9 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x20ba2e9)
#12 0x000056234b3273e1 llvm::FPPassManager::runOnModule(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x20ba3e1)
#13 0x000056234b326541 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x20b9541)
#14 0x0000562349afaaef main
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x88daef)
#15 0x00007fbb426cdb97 __libc_start_main
/build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0
#16 0x0000562349b727ca _start
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x9057ca)
Segmentation fault (core dumped)

Bugpoint cannot reproduce this bug.

---------------------------------------------------
int *a;
void b() {
  for (;;)
    *a |= 0;
}

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