/bin/bash: line 1: 496655 Segmentation fault ld.lld -m elf_x86_64 -mllvm -import-instr-limit=5 --mllvm=-enable-fs-discriminator=true --mllvm=-improved-fs-discriminator=true -plugin-opt=thinlto -plugin-opt=-split-machine-functions -z noexecstack -r -o...

/bin/bash: line 1: 496655 Segmentation fault ld.lld -m elf_x86_64 -mllvm -import-instr-limit=5 --mllvm=-enable-fs-discriminator=true --mllvm=-improved-fs-discriminator=true -plugin-opt=thinlto -plugin-opt=-split-machine-functions -z noexecstack -r -o...

[kernel test robot]

:::::: 
:::::: Manual check reason: "clang compiler bug"
:::::: 

BCC: lkp@intel.com
CC: llvm@lists.linux.dev
CC: oe-kbuild-all@lists.linux.dev
CC: linux-kernel@vger.kernel.org
TO: Rong Xu <xur@google.com>
CC: Nathan Chancellor <nathan@kernel.org>
CC: Kees Cook <kees@kernel.org>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   bcc44b6785f216eb939226ade6e3910baa30516b
commit: e88b2fe8b9993c9cae856019b1c31c14b63cad7a kconfig: Remove the architecture specific config for AutoFDO
date:   9 weeks ago
:::::: branch date: 24 hours ago
:::::: commit date: 9 weeks ago
config: um-randconfig-002-20260809 (https://download.01.org/0day-ci/archive/20260809/202608090656.NQEMW00n-lkp@intel.com/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260809/202608090656.NQEMW00n-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Fixes: e88b2fe8b999 ("kconfig: Remove the architecture specific config for AutoFDO")
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/r/202608090656.NQEMW00n-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from kernel/rcu/rcutorture.c:25:
   In file included from include/linux/interrupt.h:11:
   In file included from include/linux/hardirq.h:11:
   In file included from arch/um/include/asm/hardirq.h:24:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:12:
   In file included from arch/um/include/asm/io.h:24:
   include/asm-generic/io.h:1209:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
    1209 |         return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port;
         |                                                   ~~~~~~~~~~ ^
   1 warning generated.
   PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
   Stack dump:
   0.	Running pass 'Function Pass Manager' on module 'kernel/rcu/rcutorture.o'.
   1.	Running pass 'Prologue/Epilogue Insertion & Frame Finalization' on function '@rcu_torture_cb'
    #0 0x0000559670c03f8b llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (lld+0x7dbf8b)
    #1 0x0000559670c0191b SignalHandler(int) Signals.cpp:0:0
    #2 0x00007f7a86b71df0 (/lib/x86_64-linux-gnu/libc.so.6+0x3fdf0)
    #3 0x0000559672feebf2 (anonymous namespace)::PEI::runOnMachineFunction(llvm::MachineFunction&) PrologEpilogInserter.cpp:0:0
    #4 0x0000559672ed3f15 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (.part.0) MachineFunctionPass.cpp:0:0
    #5 0x000055967475c8b9 llvm::FPPassManager::runOnFunction(llvm::Function&) (lld+0x43348b9)
    #6 0x000055967475c9ec llvm::FPPassManager::runOnModule(llvm::Module&) (lld+0x43349ec)
    #7 0x000055967475d318 llvm::legacy::PassManagerImpl::run(llvm::Module&) (lld+0x4335318)
    #8 0x0000559672c9027c codegen(llvm::lto::Config const&, llvm::TargetMachine*, std::function<llvm::Expected<std::unique_ptr<llvm::CachedFileStream, std::default_delete<llvm::CachedFileStream>>> (unsigned int, llvm::Twine const&)>, unsigned int, llvm::Module&, llvm::ModuleSummaryIndex const&) LTOBackend.cpp:0:0
    #9 0x0000559672c9178a llvm::lto::thinBackend(llvm::lto::Config const&, unsigned int, std::function<llvm::Expected<std::unique_ptr<llvm::CachedFileStream, std::default_delete<llvm::CachedFileStream>>> (unsigned int, llvm::Twine const&)>, llvm::Module&, llvm::ModuleSummaryIndex const&, llvm::StringMap<std::unordered_set<unsigned long, std::hash<unsigned long>, std::equal_to<unsigned long>, std::allocator<unsigned long>>, llvm::MallocAllocator> const&, llvm::DenseMap<unsigned long, llvm::GlobalValueSummary*, llvm::DenseMapInfo<unsigned long, void>, llvm::detail::DenseMapPair<unsigned long, llvm::GlobalValueSummary*>> const&, llvm::MapVector<llvm::StringRef, llvm::BitcodeModule, llvm::DenseMap<llvm::StringRef, unsigned int, llvm::DenseMapInfo<llvm::StringRef, void>, llvm::detail::DenseMapPair<llvm::StringRef, unsigned int>>, llvm::SmallVector<std::pair<llvm::StringRef, llvm::BitcodeModule>, 0u>>*, std::vector<unsigned char, std::allocator<unsigned char>> const&) (lld+0x286978a)
   #10 0x0000559672c81d2d std::_Function_handler<void (), std::_Bind<(anonymous namespace)::InProcessThinBackend::start(unsigned int, llvm::BitcodeModule, llvm::StringMap<std::unordered_set<unsigned long, std::hash<unsigned long>, std::equal_to<unsigned long>, std::allocator<unsigned long>>, llvm::MallocAllocator> const&, llvm::DenseSet<llvm::ValueInfo, llvm::DenseMapInfo<llvm::ValueInfo, void>> const&, std::map<unsigned long, llvm::GlobalValue::LinkageTypes, std::less<unsigned long>, std::allocator<std::pair<unsigned long const, llvm::GlobalValue::LinkageTypes>>> const&, llvm::MapVector<llvm::StringRef, llvm::BitcodeModule, llvm::DenseMap<llvm::StringRef, unsigned int, llvm::DenseMapInfo<llvm::StringRef, void>, llvm::detail::DenseMapPair<llvm::StringRef, unsigned int>>, llvm::SmallVector<std::pair<llvm::StringRef, llvm::BitcodeModule>, 0u>>&)::'lambda'(llvm::BitcodeModule, llvm::ModuleSummaryIndex&, llvm::StringMap<std::unordered_set<unsigned long, std::hash<unsigned long>, std::equal_to<unsigned long>, std::allocator<unsigned long>>, llvm::MallocAllocator> const&, llvm::DenseSet<llvm::ValueInfo, llvm::DenseMapInfo<llvm::ValueInfo, void>> const&, std::map<unsigned long, llvm::GlobalValue::LinkageTypes, std::less<unsigned long>, std::allocator<std::pair<unsigned long const, llvm::GlobalValue::LinkageTypes>>> const&, llvm::DenseMap<unsigned long, llvm::GlobalValueSummary*, llvm::DenseMapInfo<unsigned long, void>, llvm::detail::DenseMapPair<unsigned long, llvm::GlobalValueSummary*>> const&, llvm::MapVector<llvm::StringRef, llvm::BitcodeModule, llvm::DenseMap<llvm::StringRef, unsigned int, llvm::DenseMapInfo<llvm::StringRef, void>, llvm::detail::DenseMapPair<llvm::StringRef, unsigned int>>, llvm::SmallVector<std::pair<llvm::StringRef, llvm::BitcodeModule>, 0u>>&) (llvm::BitcodeModule, std::reference_wrapper<llvm::ModuleSummaryIndex>, std::reference_wrapper<llvm::StringMap<std::unordered_set<unsigned long, std::hash<unsigned long>, std::equal_to<unsigned long>, std::allocator<unsigned long>>, llvm::MallocAllocator> const>, std::reference_wrapper<llvm::DenseSet<llvm::ValueInfo, llvm::DenseMapInfo<llvm::ValueInfo, void>> const>, std::reference_wrapper<std::map<unsigned long, llvm::GlobalValue::LinkageTypes, std::less<unsigned long>, std::allocator<std::pair<unsigned long const, llvm::GlobalValue::LinkageTypes>>> const>, std::reference_wrapper<llvm::DenseMap<unsigned long, llvm::GlobalValueSummary*, llvm::DenseMapInfo<unsigned long, void>, llvm::detail::DenseMapPair<unsigned long, llvm::GlobalValueSummary*>> const>, std::reference_wrapper<llvm::MapVector<llvm::StringRef, llvm::BitcodeModule, llvm::DenseMap<llvm::StringRef, unsigned int, llvm::DenseMapInfo<llvm::StringRef, void>, llvm::detail::DenseMapPair<llvm::StringRef, unsigned int>>, llvm::SmallVector<std::pair<llvm::StringRef, llvm::BitcodeModule>, 0u>>>)>>::_M_invoke(std::_Any_data const&) LTO.cpp:0:0
   #11 0x0000559670f8b32b std::_Function_handler<void (), llvm::ThreadPool::createTaskAndFuture(std::function<void ()>)::'lambda'()>::_M_invoke(std::_Any_data const&) (lld+0xb6332b)
   #12 0x00005596748b5a9b llvm::ThreadPool::processTasks(llvm::ThreadPoolTaskGroup*) (lld+0x448da9b)
   #13 0x00005596748b63cc void* llvm::thread::ThreadProxy<std::tuple<llvm::ThreadPool::grow(int)::'lambda'()>>(void*) ThreadPool.cpp:0:0
   #14 0x00007f7a86bc4b7b (/lib/x86_64-linux-gnu/libc.so.6+0x92b7b)
   #15 0x00007f7a86c42630 clone (/lib/x86_64-linux-gnu/libc.so.6+0x110630)
>> /bin/bash: line 1: 496655 Segmentation fault      ld.lld -m elf_x86_64 -mllvm -import-instr-limit=5 --mllvm=-enable-fs-discriminator=true --mllvm=-improved-fs-discriminator=true -plugin-opt=thinlto -plugin-opt=-split-machine-functions -z noexecstack -r -o kernel/rcu/.tmp_rcutorture.o kernel/rcu/rcutorture.o

--
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https://github.com/intel/lkp-tests/wiki