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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - opt crashes with "with "opt -instsimplify -flattencfg" : Assertion `Val && "isa<> used on a null pointer"' failed."
href="https://bugs.llvm.org/show_bug.cgi?id=40925">40925</a>
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<tr>
<th>Summary</th>
<td>opt crashes with "with "opt -instsimplify -flattencfg" : Assertion `Val && "isa<> used on a null pointer"' failed.
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>cszide@163.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=21538" name="attach_21538" title=".bc file of the source code">attachment 21538</a> <a href="attachment.cgi?id=21538&action=edit" title=".bc file of the source code">[details]</a></span>
.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 -instsimplify -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 -instsimplify
-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 '@d'
#0 0x000055791eea0b7b llvm::sys::PrintStackTrace(llvm::raw_ostream&)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/Support/Unix/Signals.inc:494:0
#1 0x000055791eea0c0e PrintStackTraceSignalHandler(void*)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/Support/Unix/Signals.inc:558:0
#2 0x000055791ee9eb92 llvm::sys::RunSignalHandlers()
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/Support/Signals.cpp:68:0
#3 0x000055791eea059d SignalHandler(int)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/Support/Unix/Signals.inc:357:0
#4 0x00007fda7cd80890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
#5 0x00007fda7ba32e97 gsignal
/build/glibc-OTsEL5/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
#6 0x00007fda7ba34801 abort /build/glibc-OTsEL5/glibc-2.27/stdlib/abort.c:81:0
#7 0x00007fda7ba2439a __assert_fail_base
/build/glibc-OTsEL5/glibc-2.27/assert/assert.c:89:0
#8 0x00007fda7ba24412 (/lib/x86_64-linux-gnu/libc.so.6+0x30412)
#9 0x000055791ca4df98 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 0x000055791ca4d902 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 0x000055791cc248e0 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 0x000055791cc2461f 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 0x000055791cc23f8e 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 0x000055791eebf3a9 llvm::GetIfCondition(llvm::BasicBlock*,
llvm::BasicBlock*&, llvm::BasicBlock*&)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp:826:0
#15 0x000055791eeed6b0 (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 0x000055791eeedbf1 (anonymous
namespace)::FlattenCFGOpt::run(llvm::BasicBlock*)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/Transforms/Utils/FlattenCFG.cpp:481:0
#17 0x000055791eeedc7f llvm::FlattenCFG(llvm::BasicBlock*, llvm::AAResults*)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/Transforms/Utils/FlattenCFG.cpp:491:0
#18 0x000055791eb4bb6b iterativelyFlattenCFG(llvm::Function&, llvm::AAResults*)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/Transforms/Scalar/FlattenCFGPass.cpp:61:0
#19 0x000055791eb4bbe6 (anonymous
namespace)::FlattenCFGPass::runOnFunction(llvm::Function&)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/Transforms/Scalar/FlattenCFGPass.cpp:74:0
#20 0x000055791e6211fc llvm::FPPassManager::runOnFunction(llvm::Function&)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/IR/LegacyPassManager.cpp:1643:0
#21 0x000055791e621473 llvm::FPPassManager::runOnModule(llvm::Module&)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/IR/LegacyPassManager.cpp:1678:0
#22 0x000055791e621844 (anonymous
namespace)::MPPassManager::runOnModule(llvm::Module&)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/IR/LegacyPassManager.cpp:1743:0
#23 0x000055791e621fd3 llvm::legacy::PassManagerImpl::run(llvm::Module&)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/IR/LegacyPassManager.cpp:1856:0
#24 0x000055791e6221c5 llvm::legacy::PassManager::run(llvm::Module&)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/IR/LegacyPassManager.cpp:1888:0
#25 0x000055791c87f15f main
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/tools/opt/opt.cpp:862:0
#26 0x00007fda7ba15b97 __libc_start_main
/build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0
#27 0x000055791c840cba _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).
a, b;
d() { int c = (b && c, a) && 10; }</pre>
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