[llvm-bugs] [Bug 43423] New: globalopt crashes: Assertion `use_empty() && "Uses remain when a value is destroyed!"' failed.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=43423

            Bug ID: 43423
           Summary: globalopt crashes: Assertion `use_empty() && "Uses
                    remain when a value is destroyed!"' failed.
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Interprocedural Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: cszide at 163.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 22552
  --> https://bugs.llvm.org/attachment.cgi?id=22552&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 -loop-rotate -licm -jump-threading -loop-versioning -globalopt small.bc -o
small-opt.bc
While deleting: i32 %inc
Use still stuck around after Def is destroyed:  %inc.lcssa6.lver.orig = phi i32
[ 0, %for.body.lver.orig ], [ %inc, %for.inc ]
opt: /home/jack-zhou/Documents/llvm/llvm_truck/llvm2/lib/IR/Value.cpp:91:
llvm::Value::~Value(): Assertion `use_empty() && "Uses remain when a value is
destroyed!"' failed.
Stack dump:
0.      Program arguments:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt -loop-rotate
-licm -jump-threading -loop-versioning -globalopt small.bc -o small-opt.bc 
1.      Running pass 'Global Variable Optimizer' on module 'small.bc'.
 #0 0x0000558e55916dca llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x277adca)
 #1 0x0000558e55914aa4 llvm::sys::RunSignalHandlers()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x2778aa4)
 #2 0x0000558e55914be2 SignalHandler(int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x2778be2)
 #3 0x00007f4b89210890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
 #4 0x00007f4b87ec2e97 raise
/build/glibc-OTsEL5/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
 #5 0x00007f4b87ec4801 abort /build/glibc-OTsEL5/glibc-2.27/stdlib/abort.c:81:0
 #6 0x00007f4b87eb439a __assert_fail_base
/build/glibc-OTsEL5/glibc-2.27/assert/assert.c:89:0
 #7 0x00007f4b87eb4412 (/lib/x86_64-linux-gnu/libc.so.6+0x30412)
 #8 0x0000558e552b3635
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x2117635)
 #9 0x0000558e552b3690 llvm::Value::deleteValue()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x2117690)
#10 0x0000558e5516bd92 llvm::BasicBlock::~BasicBlock()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x1fcfd92)
#11 0x0000558e559a5180 llvm::removeUnreachableBlocks(llvm::Function&,
llvm::LazyValueInfo*, llvm::DomTreeUpdater*, llvm::MemorySSAUpdater*)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x2809180)
#12 0x0000558e55364ebc optimizeGlobalsInModule(llvm::Module&, llvm::DataLayout
const&, llvm::function_ref<llvm::TargetLibraryInfo& (llvm::Function&)>,
llvm::function_ref<llvm::TargetTransformInfo& (llvm::Function&)>,
llvm::function_ref<llvm::BlockFrequencyInfo& (llvm::Function&)>,
llvm::function_ref<llvm::DominatorTree& (llvm::Function&)>)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x21c8ebc)
#13 0x0000558e55365e4c (anonymous
namespace)::GlobalOptLegacyPass::runOnModule(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x21c9e4c)
#14 0x0000558e55255541 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x20b9541)
#15 0x0000558e53a29aef main
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x88daef)
#16 0x00007f4b87ea5b97 __libc_start_main
/build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0
#17 0x0000558e53aa17ca _start
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x9057ca)
Aborted (core dumped)

Bugpoint cannot reproduce this bug.
-------------------------------------------------
int a, c;
char b;
void d() {
  for (; b != 9; ++b) {
    c = 0;
    for (; c; ++c)
      for (; a;)
        ;
  }
}

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