[llvm-bugs] [Bug 49572] New: attributor pass crashes: Assertion `(!V || V == &NV || isa<UndefValue>(NV)) && "Use was registered twice for replacement with different values!"' failed.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=49572

            Bug ID: 49572
           Summary: attributor pass crashes: Assertion `(!V || V == &NV ||
                    isa<UndefValue>(NV)) && "Use was registered twice for
                    replacement with different values!"' 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 24637
  --> https://bugs.llvm.org/attachment.cgi?id=24637&action=edit
small.bc

$clang -v
clang version 13.0.0 (https://github.com/llvm/llvm-project.git
77394c12a48822bb7a9183408f922d90c1d563cd)
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/10
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.5
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/7.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/10
Candidate multilib: .;@m64
Selected multilib: .;@m64

$clang -O3 -c -emit-llvm -femit-all-decls -mllvm -disable-llvm-optzns small.c
-o small.bc

$opt -instcombine -jump-threading -structurizecfg -attributor small.bc -o
small-opt.bc
opt:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/llvm/include/llvm/Transforms/IPO/Attributor.h:1350:
bool llvm::Attributor::changeUseAfterManifest(llvm::Use&, llvm::Value&):
Assertion `(!V || V == &NV || isa<UndefValue>(NV)) && "Use was registered twice
for replacement with different values!"' failed.
PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash
backtrace.
Stack dump:
0.      Program arguments:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/build/bin/opt
-instcombine -jump-threading -structurizecfg -attributor small.bc -o
small-opt.bc
1.      Running pass 'Deduce and propagate attributes' on module 'small.bc'.
 #0 0x000055fb5f7855ec llvm::sys::PrintStackTrace(llvm::raw_ostream&, int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/build/bin/opt+0x2e865ec)
 #1 0x000055fb5f7832b4 llvm::sys::RunSignalHandlers()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/build/bin/opt+0x2e842b4)
 #2 0x000055fb5f783423 SignalHandler(int) Signals.cpp:0:0
 #3 0x00007fe553c2b8a0 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x128a0)
 #4 0x00007fe552892f47 raise
/build/glibc-2ORdQG/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
 #5 0x00007fe5528948b1 abort /build/glibc-2ORdQG/glibc-2.27/stdlib/abort.c:81:0
 #6 0x00007fe55288442a __assert_fail_base
/build/glibc-2ORdQG/glibc-2.27/assert/assert.c:89:0
 #7 0x00007fe5528844a2 (/lib/x86_64-linux-gnu/libc.so.6+0x304a2)
 #8 0x000055fb5f0393ee llvm::Attributor::changeUseAfterManifest(llvm::Use&,
llvm::Value&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/build/bin/opt+0x273a3ee)
 #9 0x000055fb5f03a09e (anonymous
namespace)::AAValueSimplifyImpl::manifest(llvm::Attributor&)
AttributorAttributes.cpp:0:0
#10 0x000055fb5f007bc2 llvm::Attributor::manifestAttributes()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/build/bin/opt+0x2708bc2)
#11 0x000055fb5f0172f9 llvm::Attributor::run()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/build/bin/opt+0x27182f9)
#12 0x000055fb5f017863 runAttributorOnFunctions(llvm::InformationCache&,
llvm::SetVector<llvm::Function*, std::vector<llvm::Function*,
std::allocator<llvm::Function*> >, llvm::DenseSet<llvm::Function*,
llvm::DenseMapInfo<llvm::Function*> > >&, llvm::AnalysisGetter&,
llvm::CallGraphUpdater&, bool) (.constprop.951) Attributor.cpp:0:0
#13 0x000055fb5f018a24 (anonymous
namespace)::AttributorLegacyPass::runOnModule(llvm::Module&) (.part.945)
Attributor.cpp:0:0
#14 0x000055fb5ef34196 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/build/bin/opt+0x2635196)
#15 0x000055fb5d275c0d main
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/build/bin/opt+0x976c0d)
#16 0x00007fe552875b97 __libc_start_main
/build/glibc-2ORdQG/glibc-2.27/csu/../csu/libc-start.c:344:0
#17 0x000055fb5d33eeaa _start
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/build/bin/opt+0xa3feaa)
Aborted (core dumped)

The source code of small.c is as follows.
--------------------------------------------------------
int a, b, c;
static char(e)(f) { return f < 0 ?: f; }
static short(g)(f) {
  int d = 0;
  return f > d ?: f << d;
}
static int h(int *, long i) { a = g(i); }
int *j(short) {}
static unsigned short l();
static long m() {
k:
  h(j((l(), e(0))), 8);
  goto k;
}
unsigned short l() {
  for (; b; b++)
    ;
  for (;;)
    return 1;
}
void main() { c &&m(); }

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