[llvm-bugs] [Bug 40928] New: opt crashes with "opt -instcombine -flattencfg"

via llvm-bugs llvm-bugs at lists.llvm.org
Fri Mar 1 22:53:44 PST 2019 

https://bugs.llvm.org/show_bug.cgi?id=40928

            Bug ID: 40928
           Summary: opt crashes with "opt -instcombine -flattencfg"
           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 21541
  --> https://bugs.llvm.org/attachment.cgi?id=21541&action=edit
.bc file of the source code

$clang -v
clang version 9.0.0 (trunk 354742)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm/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/7.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.3.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64

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

$opt -instcombine -flattencfg small.bc -o small-opt.bc
opt:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/include/llvm/Support/Casting.h:105:
static bool llvm::isa_impl_cl<To, const From*>::doit(const From*) [with To =
llvm::BranchInst; From = llvm::Instruction]: Assertion `Val && "isa<> used on a
null pointer"' failed.
Stack dump:
0.      Program arguments:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/build2/bin/opt -instcombine
-flattencfg small.bc -o small-opt.bc 
1.      Running pass 'Function Pass Manager' on module 'small.bc'.
2.      Running pass 'Flatten the CFG' on function '@a'
 #0 0x000055e91f4ecb7b llvm::sys::PrintStackTrace(llvm::raw_ostream&)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/Support/Unix/Signals.inc:494:0
 #1 0x000055e91f4ecc0e PrintStackTraceSignalHandler(void*)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/Support/Unix/Signals.inc:558:0
 #2 0x000055e91f4eab92 llvm::sys::RunSignalHandlers()
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/Support/Signals.cpp:68:0
 #3 0x000055e91f4ec59d SignalHandler(int)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/Support/Unix/Signals.inc:357:0
 #4 0x00007f37ae106890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
 #5 0x00007f37acdb8e97 gsignal
/build/glibc-OTsEL5/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
 #6 0x00007f37acdba801 abort /build/glibc-OTsEL5/glibc-2.27/stdlib/abort.c:81:0
 #7 0x00007f37acdaa39a __assert_fail_base
/build/glibc-OTsEL5/glibc-2.27/assert/assert.c:89:0
 #8 0x00007f37acdaa412 (/lib/x86_64-linux-gnu/libc.so.6+0x30412)
 #9 0x000055e91d099f98 llvm::isa_impl_cl<llvm::BranchInst, llvm::Instruction
const*>::doit(llvm::Instruction const*)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/include/llvm/Support/Casting.h:106:0
#10 0x000055e91d099902 llvm::isa_impl_wrap<llvm::BranchInst, llvm::Instruction
const*, llvm::Instruction const*>::doit(llvm::Instruction const* const&)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/include/llvm/Support/Casting.h:133:0
#11 0x000055e91d2708e0 llvm::isa_impl_wrap<llvm::BranchInst, llvm::Instruction*
const, llvm::Instruction const*>::doit(llvm::Instruction* const&)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/include/llvm/Support/Casting.h:125:0
#12 0x000055e91d27061f bool llvm::isa<llvm::BranchInst,
llvm::Instruction*>(llvm::Instruction* const&)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/include/llvm/Support/Casting.h:144:0
#13 0x000055e91d26ff8e llvm::cast_retty<llvm::BranchInst,
llvm::Instruction*>::ret_type llvm::dyn_cast<llvm::BranchInst,
llvm::Instruction>(llvm::Instruction*)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/include/llvm/Support/Casting.h:333:0
#14 0x000055e91f50b3a9 llvm::GetIfCondition(llvm::BasicBlock*,
llvm::BasicBlock*&, llvm::BasicBlock*&)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp:826:0
#15 0x000055e91f5396b0 (anonymous
namespace)::FlattenCFGOpt::MergeIfRegion(llvm::BasicBlock*,
llvm::IRBuilder<llvm::ConstantFolder, llvm::IRBuilderDefaultInserter>&)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/Transforms/Utils/FlattenCFG.cpp:400:0
#16 0x000055e91f539bf1 (anonymous
namespace)::FlattenCFGOpt::run(llvm::BasicBlock*)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/Transforms/Utils/FlattenCFG.cpp:481:0
#17 0x000055e91f539c7f llvm::FlattenCFG(llvm::BasicBlock*, llvm::AAResults*)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/Transforms/Utils/FlattenCFG.cpp:491:0
#18 0x000055e91f197b6b iterativelyFlattenCFG(llvm::Function&, llvm::AAResults*)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/Transforms/Scalar/FlattenCFGPass.cpp:61:0
#19 0x000055e91f197be6 (anonymous
namespace)::FlattenCFGPass::runOnFunction(llvm::Function&)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/Transforms/Scalar/FlattenCFGPass.cpp:74:0
#20 0x000055e91ec6d1fc llvm::FPPassManager::runOnFunction(llvm::Function&)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/IR/LegacyPassManager.cpp:1643:0
#21 0x000055e91ec6d473 llvm::FPPassManager::runOnModule(llvm::Module&)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/IR/LegacyPassManager.cpp:1678:0
#22 0x000055e91ec6d844 (anonymous
namespace)::MPPassManager::runOnModule(llvm::Module&)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/IR/LegacyPassManager.cpp:1743:0
#23 0x000055e91ec6dfd3 llvm::legacy::PassManagerImpl::run(llvm::Module&)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/IR/LegacyPassManager.cpp:1856:0
#24 0x000055e91ec6e1c5 llvm::legacy::PassManager::run(llvm::Module&)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/IR/LegacyPassManager.cpp:1888:0
#25 0x000055e91cecb15f main
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/tools/opt/opt.cpp:862:0
#26 0x00007f37acd9bb97 __libc_start_main
/build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0
#27 0x000055e91ce8ccba _start
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm/build2/bin/opt+0x1808cba)
Aborted (core dumped)

The following is the source code of small.c, which is generated by csmith 2.4.0
and reduced by creduce 2.9.0 (eca4f38).

#include "csmith.h"
a() { int16_t b = (b || 5) >= b && 1; }

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