[llvm-bugs] [Bug 49947] New: Crash after using tasking on Mac M1

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=49947

            Bug ID: 49947
           Summary: Crash after using tasking on Mac M1
           Product: OpenMP
           Version: unspecified
          Hardware: Macintosh
                OS: MacOS X
            Status: NEW
          Severity: release blocker
          Priority: P
         Component: Clang Compiler Support
          Assignee: unassignedclangbugs at nondot.org
          Reporter: jcownie at gmail.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 24747
  --> https://bugs.llvm.org/attachment.cgi?id=24747&action=edit
Failing code

The attached, trivial, code SEGVs after returning from main on 
$ uname -a
Darwin Mac-mini.local 20.3.0 Darwin Kernel Version 20.3.0: Thu Jan 21 00:06:51
PST 2021; root:xnu-7195.81.3~1/RELEASE_ARM64_T8101 arm64

$ clang++ -v -fopenmp omp_tasks.cc 
clang version 13.0.0 (https://github.com/llvm/llvm-project.git
58f3201a20f7c51393ef4509b69515cb9c4b32bf)
Target: aarch64-apple-darwin20.3.0
Thread model: posix
InstalledDir: /Users/jcownie/software/clang-12.0.0/arm64/bin
 "/Users/jcownie/software/clang-12.0.0/arm64/bin/clang-13" -cc1 -triple
arm64-apple-macosx11.0.0 -Wundef-prefix=TARGET_OS_ -Werror=undef-prefix
-Wdeprecated-objc-isa-usage -Werror=deprecated-objc-isa-usage -emit-obj
-mrelax-all --mrelax-relocations -disable-free -main-file-name omp_tasks.cc
-mrelocation-model pic -pic-level 2 -mframe-pointer=non-leaf -fno-rounding-math
-munwind-tables -fcompatibility-qualified-id-block-type-checking
-fvisibility-inlines-hidden-static-local-var -target-cpu apple-a13
-target-feature +v8.4a -target-feature +fp-armv8 -target-feature +neon
-target-feature +crc -target-feature +crypto -target-feature +dotprod
-target-feature +fullfp16 -target-feature +ras -target-feature +lse
-target-feature +rdm -target-feature +rcpc -target-feature +zcm -target-feature
+zcz -target-feature +fp16fml -target-feature +sm4 -target-feature +sha3
-target-feature +sha2 -target-feature +aes -target-abi darwinpcs
-fallow-half-arguments-and-returns -debugger-tuning=lldb -target-linker-version
609.8 -v -fcoverage-compilation-dir=/Users/jcownie/tmp -resource-dir
/Users/jcownie/software/clang-12.0.0/arm64/lib/clang/13.0.0 -isysroot
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk
-stdlib=libc++ -internal-isystem
/Users/jcownie/software/clang-12.0.0/arm64/bin/../include/c++/v1
-internal-isystem
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/local/include
-internal-isystem
/Users/jcownie/software/clang-12.0.0/arm64/lib/clang/13.0.0/include
-internal-externc-isystem
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include
-fdeprecated-macro -fdebug-compilation-dir=/Users/jcownie/tmp -ferror-limit 19
-fmessage-length=160 -fopenmp -fopenmp-cuda-parallel-target-regions
-stack-protector 1 -fblocks -fencode-extended-block-signature
-fregister-global-dtors-with-atexit -fgnuc-version=4.2.1 -fcxx-exceptions
-fexceptions -fmax-type-align=16 -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o
/var/folders/lt/nf3dtk8j16qfsl97d_vgv4dw000lts/T/omp_tasks-63de8e.o -x c++
omp_tasks.cc
clang -cc1 version 13.0.0 based upon LLVM 13.0.0git default target
aarch64-apple-darwin20.3.0
ignoring nonexistent directory
"/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/local/include"
ignoring nonexistent directory
"/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/Library/Frameworks"
#include "..." search starts here:
#include <...> search starts here:
 /Users/jcownie/software/clang-12.0.0/arm64/bin/../include/c++/v1
 /Users/jcownie/software/clang-12.0.0/arm64/lib/clang/13.0.0/include

/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include

/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks
(framework directory)
End of search list.

"/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld"
-demangle -lto_library
/Users/jcownie/software/clang-12.0.0/arm64/lib/libLTO.dylib -no_deduplicate
-dynamic -arch arm64 -platform_version macos 11.0.0 0.0.0 -syslibroot
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk
-o a.out -L/Users/jcownie/software/clang-12.0.0/arm64/lib
/var/folders/lt/nf3dtk8j16qfsl97d_vgv4dw000lts/T/omp_tasks-63de8e.o -rpath
/Users/jcownie/software/clang-12.0.0/arm64/lib -lomp -lc++ -lSystem

$ ./a.out
./a.out
Returning from main
Segmentation fault: 11
$ 

The code works with g++ (in this environment) and with clang++ (11.0) on other
machines (including other Linux/AARCH64 ones).

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