[llvm-bugs] [Bug 43506] New: licm crashes: Assertion `It->second == nullptr && "Block is marked as having special instructions but in fact it has " "none!"' failed.

Mon Sep 30 06:18:01 PDT 2019

https://bugs.llvm.org/show_bug.cgi?id=43506

            Bug ID: 43506
           Summary: licm crashes: Assertion `It->second == nullptr &&
                    "Block is marked as having special instructions but in
                    fact it  has " "none!"' failed.
           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 22606
  --> https://bugs.llvm.org/attachment.cgi?id=22606&action=edit
bugpoint-reduced-simplified.bc

This bug is triggered by the program "ghostscript" from cbench.

$clang -v
clang version 10.0.0 (trunk 373174)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/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

$opt bugpoint-reduced-simplified.bc -licm
WARNING: You're attempting to print out a bitcode file.
This is inadvisable as it may cause display problems. If
you REALLY want to taste LLVM bitcode first-hand, you
can force output with the `-f' option.

opt:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/lib/Analysis/InstructionPrecedenceTracking.cpp:92:
void llvm::InstructionPrecedenceTracking::validate(const llvm::BasicBlock*)
const: Assertion `It->second == nullptr && "Block is marked as having special
instructions but in fact it  has " "none!"' failed.
Stack dump:
0.      Program arguments:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt
bugpoint-reduced-simplified.bc -licm 
1.      Running pass 'Function Pass Manager' on module
'bugpoint-reduced-simplified.bc'.
2.      Running pass 'Loop Pass Manager' on function
'@cc_ptr_element_reloc_ptrs'
3.      Running pass 'Loop Invariant Code Motion' on basic block '%for.cond'
 #0 0x000055fe64406a7a llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x2780a7a)
 #1 0x000055fe64404754 llvm::sys::RunSignalHandlers()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x277e754)
 #2 0x000055fe64404892 SignalHandler(int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x277e892)
 #3 0x00007fc11929f890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
 #4 0x00007fc117f51e97 raise
/build/glibc-OTsEL5/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
 #5 0x00007fc117f53801 abort /build/glibc-OTsEL5/glibc-2.27/stdlib/abort.c:81:0
 #6 0x00007fc117f4339a __assert_fail_base
/build/glibc-OTsEL5/glibc-2.27/assert/assert.c:89:0
 #7 0x00007fc117f43412 (/lib/x86_64-linux-gnu/libc.so.6+0x30412)
 #8 0x000055fe6381a6b8
llvm::InstructionPrecedenceTracking::validate(llvm::BasicBlock const*) const
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x1b946b8)
 #9 0x000055fe6381aa65
llvm::InstructionPrecedenceTracking::getFirstSpecialInstruction(llvm::BasicBlock
const*)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x1b94a65)
#10 0x000055fe6381b1b5
llvm::InstructionPrecedenceTracking::isPreceededBySpecialInstruction(llvm::Instruction
const*)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x1b951b5)
#11 0x000055fe6372d9df
llvm::ICFLoopSafetyInfo::isGuaranteedToExecute(llvm::Instruction const&,
llvm::DominatorTree const*, llvm::Loop const*) const
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x1aa79df)
#12 0x000055fe641c747c
llvm::hoistRegion(llvm::DomTreeNodeBase<llvm::BasicBlock>*, llvm::AAResults*,
llvm::LoopInfo*, llvm::DominatorTree*, llvm::TargetLibraryInfo*, llvm::Loop*,
llvm::AliasSetTracker*, llvm::MemorySSAUpdater*, llvm::ICFLoopSafetyInfo*,
llvm::SinkAndHoistLICMFlags&, llvm::OptimizationRemarkEmitter*)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x254147c)
#13 0x000055fe641cbefd (anonymous
namespace)::LoopInvariantCodeMotion::runOnLoop(llvm::Loop*, llvm::AAResults*,
llvm::LoopInfo*, llvm::DominatorTree*, llvm::TargetLibraryInfo*,
llvm::TargetTransformInfo*, llvm::ScalarEvolution*, llvm::MemorySSA*,
llvm::OptimizationRemarkEmitter*, bool)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x2545efd)
#14 0x000055fe641cda9a (anonymous
namespace)::LegacyLICMPass::runOnLoop(llvm::Loop*, llvm::LPPassManager&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x2547a9a)
#15 0x000055fe636d561b llvm::LPPassManager::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x1a4f61b)
#16 0x000055fe63d43109 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x20bd109)
#17 0x000055fe63d431d9 llvm::FPPassManager::runOnModule(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x20bd1d9)
#18 0x000055fe63d42361 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x20bc361)
#19 0x000055fe62518aff main
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x892aff)
#20 0x00007fc117f34b97 __libc_start_main
/build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0
#21 0x000055fe62590c6a _start
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x90ac6a)
Aborted

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