/bin/bash: line 1: 1095456 Segmentation fault clang -Wp,-MMD,net/ipv6/.sit.o.d -nostdinc -Iarch/mips/include -I./arch/mips/include/generated -Iinclude -I./include -Iarch/mips/include/uapi -I./arch/mips/include/generated/uapi -Iinclude/uapi -I./includ...

[kernel test robot <lkp@intel.com>]

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

BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
CC: linux-kernel@vger.kernel.org
TO: Mateusz Guzik <mjguzik@gmail.com>
CC: Christian Brauner <brauner@kernel.org>
CC: Jan Kara <jack@suse.cz>

Hi Mateusz,

FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   dd3210c47e8d3ac6b4e9141fc68acc03b38c0ba3
commit: ac8bcfc07d0ba68721a4ff750e7df12d203ae6ac fs: relocate and tidy up ihold()
date:   9 weeks ago
:::::: branch date: 18 hours ago
:::::: commit date: 9 weeks ago
config: mips-randconfig-r062-20260707 (https://download.01.org/0day-ci/archive/20260712/202607120443.9PdOP0WC-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 0a2fb2a2269da0e2a3e230beb6cad39ca314db33)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260712/202607120443.9PdOP0WC-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: ac8bcfc07d0b ("fs: relocate and tidy up ihold()")
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/r/202607120443.9PdOP0WC-lkp@intel.com/

Note: functions only called from assembly code should be annotated with the asmlinkage attribute
All errors (new ones prefixed by >>):

   PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace and dumped files.
   Stack dump:
   0.	Program arguments: clang -Wp,-MMD,net/ipv6/.sit.o.d -nostdinc -Iarch/mips/include -I./arch/mips/include/generated -Iinclude -I./include -Iarch/mips/include/uapi -I./arch/mips/include/generated/uapi -Iinclude/uapi -I./include/generated/uapi -include include/linux/compiler-version.h -include include/linux/kconfig.h -include include/linux/compiler_types.h -D__KERNEL__ --target=mipsel-linux-gnu -fintegrated-as -Werror=unknown-warning-option -Werror=ignored-optimization-argument -Werror=option-ignored -Werror=unused-command-line-argument -DVMLINUX_LOAD_ADDRESS=0xffffffff84000000 -DLINKER_LOAD_ADDRESS=0x84000000 -DDATAOFFSET=0 -fmacro-prefix-map== -Wundef -DKBUILD_EXTRA_WARN1 -fshort-wchar -funsigned-char -fno-common -fno-PIE -fno-strict-aliasing -std=gnu11 -fms-anonymous-structs -Wno-gnu -Wno-microsoft-anon-tag -mno-check-zero-division -mabi=32 -G 0 -mno-abicalls -fno-pic -pipe -msoft-float -Wa,-msoft-float -ffreestanding -EL -fno-stack-check -march=mips4 -Wa,--trap -DTOOLCHAIN_SUPPORTS_VIRT -Iarch/mips/include/asm/mach-rm -Iarch/mips/include/asm/mach-generic -fno-asynchronous-unwind-tables -fno-delete-null-pointer-checks -Os -fstack-protector-strong -ftrivial-auto-var-init=pattern -fexperimental-late-parse-attributes -fdiagnostics-show-inlining-chain -pg -fstrict-flex-arrays=3 -fno-strict-overflow -fno-stack-check -fno-builtin-wcslen -Wall -Wextra -Wundef -Werror=implicit-function-declaration -Werror=implicit-int -Werror=return-type -Werror=strict-prototypes -Wno-format-security -Wno-trigraphs -Wno-frame-address -Wno-address-of-packed-member -Wmissing-declarations -Wmissing-prototypes -Wno-format-overflow-non-kprintf -Wno-format-truncation-non-kprintf -Wno-default-const-init-unsafe -Wno-type-limits -Wno-pointer-sign -Wcast-function-type -Wno-unterminated-string-initialization -Wimplicit-fallthrough -Werror=date-time -Werror=incompatible-pointer-types -Wenum-conversion -Wunused -Wmissing-format-attribute -Wmissing-include-dirs -Wunused-const-variable -Wno-missing-field-initializers -Wno-shift-negative-value -Wno-enum-enum-conversion -Wno-sign-compare -Wno-unused-parameter -g -gdwarf-5 -DRANDSTRUCT -frandomize-layout-seed-file=./scripts/basic/randstruct.seed -fno-crash-diagnostics -Wno-error=return-type -Wreturn-type -funsigned-char -Wundef -falign-functions=64 -fsanitize=array-bounds -fsanitize=shift -fsanitize=unreachable -fsanitize=bool -Inet/ipv6 -Inet/ipv6 -DKBUILD_MODFILE=\"net/ipv6/sit\" -DKBUILD_BASENAME=\"sit\" -DKBUILD_MODNAME=\"sit\" -D__KBUILD_MODNAME=sit -c -o net/ipv6/sit.o net/ipv6/sit.c
   1.	<eof> parser at end of file
   2.	Code generation
   3.	Running pass 'Function Pass Manager' on module 'net/ipv6/sit.c'.
   4.	Running pass 'Branch Probability Basic Block Placement' on function '@ipip6_rcv'
    #0 0x000055c1f34f76da llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (clang-23+0x3e266da)
    #1 0x000055c1f34f52a4 llvm::sys::CleanupOnSignal(unsigned long) (clang-23+0x3e242a4)
    #2 0x000055c1f342aa00 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
    #3 0x00007fc0f9d3edf0 (/lib/x86_64-linux-gnu/libc.so.6+0x3fdf0)
    #4 0x000055c1f2b1b24f llvm::TailDuplicator::shouldTailDuplicate(bool, llvm::MachineBasicBlock&) (.part.0) TailDuplicator.cpp:0:0
    #5 0x000055c1f286228e (anonymous namespace)::MachineBlockPlacement::precomputeTriangleChains() MachineBlockPlacement.cpp:0:0
    #6 0x000055c1f286febb (anonymous namespace)::MachineBlockPlacement::run(llvm::MachineFunction&) MachineBlockPlacement.cpp:0:0
    #7 0x000055c1f28732cc (anonymous namespace)::MachineBlockPlacementLegacy::runOnMachineFunction(llvm::MachineFunction&) (.part.0) MachineBlockPlacement.cpp:0:0
    #8 0x000055c1f28b56b3 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (clang-23+0x31e46b3)
    #9 0x000055c1f2e04979 llvm::FPPassManager::runOnFunction(llvm::Function&) (clang-23+0x3733979)
   #10 0x000055c1f2e04dac llvm::FPPassManager::runOnModule(llvm::Module&) (clang-23+0x3733dac)
   #11 0x000055c1f2e0594a (anonymous namespace)::MPPassManager::runOnModule(llvm::Module&) LegacyPassManager.cpp:0:0
   #12 0x000055c1f2e0601c llvm::legacy::PassManagerImpl::run(llvm::Module&) (clang-23+0x373501c)
   #13 0x000055c1f38a11af (anonymous namespace)::EmitAssemblyHelper::TimeCodegenPasses(llvm::function_ref<void ()>) BackendUtil.cpp:0:0
   #14 0x000055c1f38b29f2 (anonymous namespace)::EmitAssemblyHelper::emitAssembly(clang::BackendAction, std::unique_ptr<llvm::raw_pwrite_stream, std::default_delete<llvm::raw_pwrite_stream>>, clang::BackendConsumer*) (.constprop.0) BackendUtil.cpp:0:0
   #15 0x000055c1f38b2c2f clang::emitBackendOutput(clang::CompilerInstance&, clang::CodeGenOptions&, llvm::StringRef, llvm::Module*, clang::BackendAction, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>, std::unique_ptr<llvm::raw_pwrite_stream, std::default_delete<llvm::raw_pwrite_stream>>, clang::BackendConsumer*) (clang-23+0x41e1c2f)
   #16 0x000055c1f3ee8907 clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (clang-23+0x4817907)
   #17 0x000055c1f58f2a8c clang::ParseAST(clang::Sema&, bool, bool) (clang-23+0x6221a8c)
   #18 0x000055c1f424b35e clang::FrontendAction::Execute() (clang-23+0x4b7a35e)
   #19 0x000055c1f41d675e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (clang-23+0x4b0575e)
   #20 0x000055c1f4334a07 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (clang-23+0x4c63a07)
   #21 0x000055c1f053f4c8 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (clang-23+0xe6e4c8)
   #22 0x000055c1f0537193 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>) driver.cpp:0:0
   #23 0x000055c1f05371d3 int llvm::function_ref<int (llvm::SmallVectorImpl<char const*>&)>::callback_fn<clang_main(int, char**, llvm::ToolContext const&)::'lambda'(llvm::SmallVectorImpl<char const*>&)>(long, llvm::SmallVectorImpl<char const*>&) driver.cpp:0:0
   #24 0x000055c1f3f61ff9 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const::'lambda'()>(long) Job.cpp:0:0
   #25 0x000055c1f342ad63 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (clang-23+0x3d59d63)
   #26 0x000055c1f3f6354c clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const (.part.0) Job.cpp:0:0
   #27 0x000055c1f3f1e848 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (clang-23+0x484d848)
   #28 0x000055c1f3f1f7e2 clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (clang-23+0x484e7e2)
   #29 0x000055c1f3f3303c clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (clang-23+0x486203c)
   #30 0x000055c1f053be52 clang_main(int, char**, llvm::ToolContext const&) (clang-23+0xe6ae52)
   #31 0x000055c1f04573f9 main (clang-23+0xd863f9)
   #32 0x00007fc0f9d28ca8 (/lib/x86_64-linux-gnu/libc.so.6+0x29ca8)
   #33 0x00007fc0f9d28d65 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29d65)
   #34 0x000055c1f0536bf1 _start (clang-23+0xe65bf1)
   clang: error: clang frontend command failed due to signal (use -v to see invocation)
>> /bin/bash: line 1: 1095456 Segmentation fault      clang -Wp,-MMD,net/ipv6/.sit.o.d -nostdinc -Iarch/mips/include -I./arch/mips/include/generated -Iinclude -I./include -Iarch/mips/include/uapi -I./arch/mips/include/generated/uapi -Iinclude/uapi -I./include/generated/uapi -include include/linux/compiler-version.h -include include/linux/kconfig.h -include include/linux/compiler_types.h -D__KERNEL__ --target=mipsel-linux-gnu -fintegrated-as -Werror=unknown-warning-option -Werror=ignored-optimization-argument -Werror=option-ignored -Werror=unused-command-line-argument -DVMLINUX_LOAD_ADDRESS=0xffffffff84000000 -DLINKER_LOAD_ADDRESS=0x84000000 -DDATAOFFSET=0 -fmacro-prefix-map== -Wundef -DKBUILD_EXTRA_WARN1 -fshort-wchar -funsigned-char -fno-common -fno-PIE -fno-strict-aliasing -std=gnu11 -fms-anonymous-structs -Wno-gnu -Wno-microsoft-anon-tag -mno-check-zero-division -mabi=32 -G 0 -mno-abicalls -fno-pic -pipe -msoft-float -Wa,-msoft-float -ffreestanding -EL -fno-stack-check -march=mips4 -Wa,--trap -DTOOLCHAIN_SUPPORTS_VIRT -Iarch/mips/include/asm/mach-rm -Iarch/mips/include/asm/mach-generic -fno-asynchronous-unwind-tables -fno-delete-null-pointer-checks -Os -fstack-protector-strong -ftrivial-auto-var-init=pattern -fexperimental-late-parse-attributes -fdiagnostics-show-inlining-chain -pg -fstrict-flex-arrays=3 -fno-strict-overflow -fno-stack-check -fno-builtin-wcslen -Wall -Wextra -Wundef -Werror=implicit-function-declaration -Werror=implicit-int -Werror=return-type -Werror=strict-prototypes -Wno-format-security -Wno-trigraphs -Wno-frame-address -Wno-address-of-packed-member -Wmissing-declarations -Wmissing-prototypes -Wno-format-overflow-non-kprintf -Wno-format-truncation-non-kprintf -Wno-default-const-init-unsafe -Wno-type-limits -Wno-pointer-sign -Wcast-function-type -Wno-unterminated-string-initialization -Wimplicit-fallthrough -Werror=date-time -Werror=incompatible-pointer-types -Wenum-conversion -Wunused -Wmissing-format-attribute -Wmissing-include-dirs -Wunused-const-variable -Wno-missing-field-initializers -Wno-shift-negative-value -Wno-enum-enum-conversion -Wno-sign-compare -Wno-unused-parameter -g -gdwarf-5 -DRANDSTRUCT -frandomize-layout-seed-file=./scripts/basic/randstruct.seed -fno-crash-diagnostics -Wno-error=return-type -Wreturn-type -funsigned-char -Wundef -falign-functions=64 -fsanitize=array-bounds -fsanitize=shift -fsanitize=unreachable -fsanitize=bool -Inet/ipv6 -Inet/ipv6 -DKBUILD_MODFILE='"net/ipv6/sit"' -DKBUILD_BASENAME='"sit"' -DKBUILD_MODNAME='"sit"' -D__KBUILD_MODNAME=sit -c -o net/ipv6/sit.o net/ipv6/sit.c

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