[llvm-bugs] [Bug 42613] New: ipconstprop crashes: Assertion `!contains(New, this) && "this->replaceAllUsesWith(expr(this)) is NOT valid!"' failed.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42613

            Bug ID: 42613
           Summary: ipconstprop crashes: Assertion `!contains(New, this)
                    && "this->replaceAllUsesWith(expr(this)) is NOT
                    valid!"' 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 22241
  --> https://bugs.llvm.org/attachment.cgi?id=22241&action=edit
.bc file of the source code

$clang -v
clang version 9.0.0 (trunk 364630)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build2/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 -mem2reg -jump-threading -ipconstprop small.bc -o small-opt.bc
opt: /home/jack-zhou/Documents/llvm/llvm_truck/llvm2/lib/IR/Value.cpp:401: void
llvm::Value::doRAUW(llvm::Value*, llvm::Value::ReplaceMetadataUses): Assertion
`!contains(New, this) && "this->replaceAllUsesWith(expr(this)) is NOT valid!"'
failed.
Stack dump:
0.      Program arguments:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build2/bin/opt -mem2reg
-jump-threading -ipconstprop small.bc -o small-opt.bc 
1.      Running pass 'Interprocedural constant propagation' on module
'small.bc'.
 #0 0x00005622136010ca llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build2/bin/opt+0x25ce0ca)
 #1 0x00005622135fed84 llvm::sys::RunSignalHandlers()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build2/bin/opt+0x25cbd84)
 #2 0x00005622135feec2 SignalHandler(int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build2/bin/opt+0x25cbec2)
 #3 0x00007f24acf85890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
 #4 0x00007f24abc37e97 raise
/build/glibc-OTsEL5/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
 #5 0x00007f24abc39801 abort /build/glibc-OTsEL5/glibc-2.27/stdlib/abort.c:81:0
 #6 0x00007f24abc2939a __assert_fail_base
/build/glibc-OTsEL5/glibc-2.27/assert/assert.c:89:0
 #7 0x00007f24abc29412 (/lib/x86_64-linux-gnu/libc.so.6+0x30412)
 #8 0x000056221300783b llvm::Value::doRAUW(llvm::Value*,
llvm::Value::ReplaceMetadataUses)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build2/bin/opt+0x1fd483b)
 #9 0x0000562213099b09 (anonymous namespace)::IPCP::runOnModule(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build2/bin/opt+0x2066b09)
#10 0x0000562212fabb91 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build2/bin/opt+0x1f78b91)
#11 0x000056221185c694 main
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build2/bin/opt+0x829694)
#12 0x00007f24abc1ab97 __libc_start_main
/build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0
#13 0x00005622118e242a _start
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build2/bin/opt+0x8af42a)
Aborted (core dumped)

------------------------------------------------------------
int a;
int *b(int *c) { return c; }
void d() {
  a = 1;
  if (a)
    ;
  else {
    int *e;
    for (;;) {
      int **f = &e;
      *f = b(e);
    }
  }
}

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