[llvm-bugs] [Bug 42751] New: inline crashes: Assertion `NumReferences == 0 && "Node deleted while references remain"' failed.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42751

            Bug ID: 42751
           Summary: inline crashes: Assertion `NumReferences == 0 && "Node
                    deleted while references remain"' 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 22286
  --> https://bugs.llvm.org/attachment.cgi?id=22286&action=edit
.bc file of the source code

$clang -v
clang version 9.0.0 (https://github.com/llvm/llvm-project.git
1e393064fa2732e721524f95a12348b0fd981167)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/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 -femit-all-decls -mllvm -disable-llvm-optzns small.c

opt -functionattrs -rpo-functionattrs -die -inline small.bc -o small-opt.bc
opt:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/llvm/include/llvm/Analysis/CallGraph.h:180:
llvm::CallGraphNode::~CallGraphNode(): Assertion `NumReferences == 0 && "Node
deleted while references remain"' failed.
Stack dump:
0.      Program arguments:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/build/bin/opt
-functionattrs -rpo-functionattrs -die -inline small.bc -o small-opt.bc 
1.      Running pass 'CallGraph Pass Manager' on module 'small.bc'.
 #0 0x000055f0f85396ca llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/build/bin/opt+0x25316ca)
 #1 0x000055f0f8537554 llvm::sys::RunSignalHandlers()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/build/bin/opt+0x252f554)
 #2 0x000055f0f8537692 SignalHandler(int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/build/bin/opt+0x252f692)
 #3 0x00007f120a3e7890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
 #4 0x00007f1209099e97 raise
/build/glibc-OTsEL5/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
 #5 0x00007f120909b801 abort /build/glibc-OTsEL5/glibc-2.27/stdlib/abort.c:81:0
 #6 0x00007f120908b39a __assert_fail_base
/build/glibc-OTsEL5/glibc-2.27/assert/assert.c:89:0
 #7 0x00007f120908b412 (/lib/x86_64-linux-gnu/libc.so.6+0x30412)
 #8 0x000055f0f77fa137
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/build/bin/opt+0x17f2137)
 #9 0x000055f0f77fa198
llvm::CallGraph::removeFunctionFromModule(llvm::CallGraphNode*)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/build/bin/opt+0x17f2198)
#10 0x000055f0f7fdc5d3
llvm::LegacyInlinerBase::removeDeadFunctions(llvm::CallGraph&, bool)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/build/bin/opt+0x1fd45d3)
#11 0x000055f0f7801391 (anonymous
namespace)::CGPassManager::runOnModule(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/build/bin/opt+0x17f9391)
#12 0x000055f0f7ef9631 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/build/bin/opt+0x1ef1631)
#13 0x000055f0f67ff80d main
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/build/bin/opt+0x7f780d)
#14 0x00007f120907cb97 __libc_start_main
/build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0
#15 0x000055f0f688cc1a _start
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/build/bin/opt+0x884c1a)
Aborted (core dumped)

---------------------------------------------------------
static void a() {}
void main() { a(); }

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