[llvm-bugs] [Bug 45568] New: Crash in pass "Simple Register Coalescing" when building Linux kernel's powerpc allyesconfig

Wed Apr 15 22:57:42 PDT 2020

https://bugs.llvm.org/show_bug.cgi?id=45568

            Bug ID: 45568
           Summary: Crash in pass "Simple Register Coalescing" when
                    building Linux kernel's powerpc allyesconfig
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: PowerPC
          Assignee: unassignedbugs at nondot.org
          Reporter: natechancellor at gmail.com
                CC: llvm-bugs at lists.llvm.org, nemanja.i.ibm at gmail.com

When building the 'allyesconfig' target for the Linux kernel with ARCH=powerpc,
I see the following crash:

Stack dump:
0.      Program arguments: /home/nathan/src/tc-build/install/bin/clang-11 -cc1
-triple powerpc64-unknown-linux-gnu -S -disable-free -disable-llvm-verifier
-discard-value-names -main-file-name cavium.c -mrelocation-model static
-mthread-model posix -fno-delete-null-pointer-checks -mllvm
-warn-stack-size=2048 -mframe-pointer=all -relaxed-aliasing -fmath-errno
-fno-rounding-math -no-integrated-as -mconstructor-aliases -mcmodel=medium
-target-cpu
pwr5 -target-feature -altivec -target-feature -vsx -target-feature -spe
-target-feature -hard-float -msoft-float -mfloat-abi soft -target-abi elfv1
-dwarf-column-info -fno-split-dwarf-inlining -debugger-tuning=gdb
-ffunction-sections -fdata-sections -nostdsysteminc -nobuiltininc -resource-dir
/home/nathan/src/tc-build/install/lib/clang/11.0.0 -dependency-file
drivers/mmc/host/.cavium.o.d -MT drivers/mmc/host/.tmp_cavium.o
-sys-header-deps -isystem
/home/nathan/src/tc-build/install/lib/clang/11.0.0/include -include
/home/nathan/src/linux-stable/include/linux/kconfig.h -include
/home/nathan/src/linux-stable/include/linux/compiler_types.h -I
/home/nathan/src/linux-stable/arch/powerpc/include -I
./arch/powerpc/include/generated -I /home/nathan/src/linux-stable/include -I
./include -I /home/nathan/src/linux-stable/arch/powerpc/include/uapi -I
./arch/powerpc/include/generated/uapi -I
/home/nathan/src/linux-stable/include/uapi -I ./include/generated/uapi -I
/home/nathan/src/linux-stable/drivers/mmc/host -I drivers/mmc/host -D
__KERNEL__ -I /home/nathan/src/linux-stable/arch/powerpc -D HAVE_AS_ATHIGH=1 -I
/home/nathan/src/linux-stable/arch/powerpc -D KBUILD_BASENAME="cavium" -D
KBUILD_MODNAME="thunderx_mmc"
-fmacro-prefix-map=/home/nathan/src/linux-stable/= -O2 -Wall -Wundef
-Wstrict-prototypes -Wno-trigraphs -Werror-implicit-function-declaration
-Wno-format-security -Werror=unknown-warning-option -Wno-frame-address
-Wno-int-in-bool-context -Wno-address-of-packed-member
-Wno-format-invalid-specifier -Wno-gnu -Wno-tautological-compare
-Wno-unused-const-variable -Wdeclaration-after-statement -Wno-pointer-sign
-Werror=implicit-int -Werror=strict-prototypes -Werror=date-time
-Werror=incompatible-pointer-types -Wno-initializer-overrides -Wno-unused-value
-Wno-format -Wno-sign-compare -Wno-format-zero-length -Wno-uninitialized
-Wno-pointer-to-enum-cast -std=gnu89 -fno-dwarf-directory-asm
-fdebug-compilation-dir /home/nathan/src/linux-stable/out/ppc64 -ferror-limit
19 -pg -fwrapv -fno-signed-char -fwchar-type=short -fno-signed-wchar
-fgnuc-version=4.2.1 -fcolor-diagnostics -vectorize-loops -vectorize-slp -o
/tmp/cavium-394fad.s -x c
/home/nathan/src/linux-stable/drivers/mmc/host/cavium.c
1.      <eof> parser at end of file
2.      Code generation
3.      Running pass 'Function Pass Manager' on module
'/home/nathan/src/linux-stable/drivers/mmc/host/cavium.c'.
4.      Running pass 'Simple Register Coalescing' on function
'@cvm_mmc_request'
 #0 0x00000000018c0d14 PrintStackTraceSignalHandler(void*)
(/home/nathan/src/tc-build/install/bin/clang-11+0x18c0d14)
 #1 0x00000000018beaae llvm::sys::RunSignalHandlers()
(/home/nathan/src/tc-build/install/bin/clang-11+0x18beaae)
 #2 0x00000000018c100c SignalHandler(int)
(/home/nathan/src/tc-build/install/bin/clang-11+0x18c100c)
 #3 0x00007f2a7039b890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
 #4 0x000000000112b375 (anonymous
namespace)::JoinVals::computeAssignment(unsigned int, (anonymous
namespace)::JoinVals&)
(/home/nathan/src/tc-build/install/bin/clang-11+0x112b375)
 #5 0x00000000011222bd (anonymous
namespace)::RegisterCoalescer::joinCopy(llvm::MachineInstr*, bool&)
(/home/nathan/src/tc-build/install/bin/clang-11+0x11222bd)
 #6 0x000000000111d186 (anonymous
namespace)::RegisterCoalescer::runOnMachineFunction(llvm::MachineFunction&)
(/home/nathan/src/tc-build/install/bin/clang-11+0x111d186)
 #7 0x000000000106a8d4
llvm::MachineFunctionPass::runOnFunction(llvm::Function&)
(/home/nathan/src/tc-build/install/bin/clang-11+0x106a8d4)
 #8 0x00000000013892f3 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/home/nathan/src/tc-build/install/bin/clang-11+0x13892f3)
 #9 0x0000000001389603 llvm::FPPassManager::runOnModule(llvm::Module&)
(/home/nathan/src/tc-build/install/bin/clang-11+0x1389603)
#10 0x0000000001389b8f llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/nathan/src/tc-build/install/bin/clang-11+0x1389b8f)
#11 0x0000000001a5b176 clang::EmitBackendOutput(clang::DiagnosticsEngine&,
clang::HeaderSearchOptions const&, clang::CodeGenOptions const&,
clang::TargetOptions const&, clang::LangOptions const&, llvm::DataLayout
const&, llvm::Module*, clang::BackendAction,
std::unique_ptr<llvm::raw_pwrite_stream,
std::default_delete<llvm::raw_pwrite_stream> >)
(/home/nathan/src/tc-build/install/bin/clang-11+0x1a5b176)
#12 0x000000000219f5cf
clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&)
(/home/nathan/src/tc-build/install/bin/clang-11+0x219f5cf)
#13 0x000000000278a563 clang::ParseAST(clang::Sema&, bool, bool)
(/home/nathan/src/tc-build/install/bin/clang-11+0x278a563)
#14 0x0000000002110725 clang::FrontendAction::Execute()
(/home/nathan/src/tc-build/install/bin/clang-11+0x2110725)
#15 0x000000000207252b
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/home/nathan/src/tc-build/install/bin/clang-11+0x207252b)
#16 0x000000000219a4cf
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/home/nathan/src/tc-build/install/bin/clang-11+0x219a4cf)
#17 0x0000000000a8adaa cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/home/nathan/src/tc-build/install/bin/clang-11+0xa8adaa)
#18 0x0000000000a8937b ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&)
(/home/nathan/src/tc-build/install/bin/clang-11+0xa8937b)
#19 0x0000000000a88e60 main
(/home/nathan/src/tc-build/install/bin/clang-11+0xa88e60)
#20 0x00007f2a6f051b97 __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x21b97)
#21 0x0000000000a8602a _start
(/home/nathan/src/tc-build/install/bin/clang-11+0xa8602a)
clang-11: error: unable to execute command: Segmentation fault
clang-11: error: clang frontend command failed due to signal (use -v to see
invocation)
ClangBuiltLinux clang version 11.0.0 (git://github.com/llvm/llvm-project
7aaaea5acd09c4a437bca93874eae13d880d51fd)
Target: powerpc64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/nathan/src/tc-build/install/bin
clang-11: note: diagnostic msg:
********************

creduce spits out:

struct {
  int arg
} * f;
struct b {
  int c;
  int d
};
static e[] = {0, 0};
g, h, i;
j() {
  struct b *a;
  int k;
  a = e + g;
  k = a->c;
  if (f)
    k = f->arg ?: 2;
  i = k;
  h = a->d;
}

when built with just 'clang -O2 --target=powerpc64-linux-gnu -c -o /dev/null
cavium.i'.

I have uploaded the raw preprocessed source here:
https://gist.github.com/3c2fe356d383dac766c7f3f30a04472e

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