[BUG] --debug-level full crashes when importing

[josiahls]

Bug description

Running a mojo script using the debugger seg faults, as opposed to when running regular mojo, which runs to completion (although I have noticed strange behavior in the regular script).

I've isolated this to specifically debug symbols from --debug-level full

Also even more specifically, this fails when importing the example module below. This works fine if running inside the same module file.

Steps to reproduce

• Include relevant code snippet or link to code that did not work as expected.

c_binder_mojo/c_binder_mojo/minimal_example.mojo

from collections import Optional,Dict,Set
from memory import UnsafePointer
from utils import Variant
from pathlib import Path
import os

struct AstNode(CollectionElement):
    var parent:   UnsafePointer[AstNode]

    fn __init__(mut self):
        self.parent   = UnsafePointer[Self]()

    fn __moveinit__(mut self, owned existing:Self):
        self.parent = existing.parent

    fn __copyinit__(mut self, read existing:Self):
        self.parent = existing.parent


fn make_graph(path:Path) raises -> UnsafePointer[AstNode]:
    return UnsafePointer[AstNode]() 

c_binder_mojo/tests/test_ast_node.mojo

import os 
from pathlib import Path
from memory import UnsafePointer
from c_binder_mojo.minimal_example import make_graph


fn test_ast_node() raises:
    num_mojo_path = Path('fdsfdas') # Works when debug-level is not full
    root_node = make_graph(num_mojo_path)
    print('done')


fn main():
    try:
        test_ast_node()
        print('succeeded')
    except e:
        print('failed')

Remove the --debug-level full and this will suceed. This is preventing me from going into the debugger to debug more complex issues.

/home/fastrl_mojo_user/.vscode-server/data/User/globalStorage/modular-mojotools.vscode-mojo-nightly/magic-data-home/envs/max/bin/mojo run --debug-level full -I c_binder_mojo /home/fastrl_mojo_user/fastrl_mojo/c_binder_mojo/tests/test_debugg_failure.mojo

*edit. Looks like specifically having:

struct AstNode:
    var parent:   UnsafePointer[Self]

Segfaults when static typed to a unsafe pointer, when importing from a separate file

System information

- What OS did you do install Mojo on ?
ubuntu:22.04 docker image
- Provide version information for Mojo by pasting the output of `mojo -v`
/home/fastrl_mojo_user/.vscode-server/data/User/globalStorage/modular-mojotools.vscode-mojo-nightly/magic-data-home/envs/max/bin/mojo -v
mojo 25.1.0.dev2024122805 (3497ff0b)
- Provide Magic CLI version by pasting the output of `magic -V` or `magic --version` 
magic --version
magic 0.5.1 - (based on pixi 0.37.0)
- Optionally, provide more information with `magic info`.

 magic info
     Magic version: 0.5.1
System
------------
      Pixi version: 0.37.0
          Platform: linux-64
  Virtual packages: __unix=0=0
                  : __linux=5.4.0=0
                  : __glibc=2.35=0
                  : __archspec=1=skylake
         Cache dir: /home/fastrl_mojo_user/.cache/rattler/cache
      Auth storage: /home/fastrl_mojo_user/.rattler/credentials.json
  Config locations: No config files found

Global
------------
           Bin dir: /home/fastrl_mojo_user/.modular/bin
   Environment dir: /home/fastrl_mojo_user/.modular/envs
      Manifest dir: /home/fastrl_mojo_user/.modular/manifests/pixi-global.toml

Stacktrace

Fails on debug symbols

_binder_mojo /home/fastrl_mojo_user/fastrl_mojo/c_binder_mojo/tests/test_debugg_failure.mojo
Failed to initialize Crashpad. Crash reporting will not be available. Cause: while locating crashpad handler: unable to locate crashpad handler executable
Please submit a bug report to https://github.com/modularml/mojo/issues and include the crash backtrace along with all the relevant source codes.
Stack dump:
0. Program arguments: /home/fastrl_mojo_user/.vscode-server/data/User/globalStorage/modular-mojotools.vscode-mojo-nightly/magic-data-home/envs/max/bin/mojo run --debug-level full -I c_binder_mojo /home/fastrl_mojo_user/fastrl_mojo/c_binder_mojo/tests/test_debugg_failure.mojo
#0 0x000055627fc89e4b llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) Signals.cpp:0:0
#1 0x000055627fc87da9 llvm::sys::RunSignalHandlers() Signals.cpp:0:0
#2 0x000055627fc8a4cd SignalHandler(int) Signals.cpp:0:0
#3 0x00007fd273088520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x000055627d33f7ca M::DebugInfo::DIMemberType::print(mlir::AsmPrinter&) const DebugInfoTypes.cpp:0:0
#5 0x000055627d3487fd ZN4llvm10interleaveIPKN1M9DebugInfo12DIMemberTypeEZN4mlir10AsmPrinter23printStrippedAttrOrTypeIS3_TnPNSt9enable_ifIXsr23detect_has_print_methodIT_EE5valueEvE4typeELPv0EEEvNS_8ArrayRefISA_EEEUlS3_E_ZNS_10interleaveINSF_IS3_EESH_NS_11raw_ostreamES4_EEvRKSA_RT1_T0_RKNS_9StringRefEEUlvE_vEEvSA_SA_SP_SN DebugInfoTypes.cpp:0:0
#6 0x000055627d340b34 M::DebugInfo::DIStructType::print(mlir::AsmPrinter&) const DebugInfoTypes.cpp:0:0
#7 0x000055627d344abc M::DebugInfo::DebugInfoDialect::printType(mlir::Type, mlir::DialectAsmPrinter&) const DebugInfoTypes.cpp:0:0
#8 0x000055627fb74de3 mlir::AsmPrinter::Impl::printDialectType(mlir::Type) AsmPrinter.cpp:0:0
#9 0x000055627d341879 M::DebugInfo::DITargetIndependentPointerType::print(mlir::AsmPrinter&) const DebugInfoTypes.cpp:0:0
#10 0x000055627d344b73 M::DebugInfo::DebugInfoDialect::printType(mlir::Type, mlir::DialectAsmPrinter&) const DebugInfoTypes.cpp:0:0
#11 0x000055627fb74de3 mlir::AsmPrinter::Impl::printDialectType(mlir::Type) AsmPrinter.cpp:0:0
#12 0x000055627d341879 M::DebugInfo::DITargetIndependentPointerType::print(mlir::AsmPrinter&) const DebugInfoTypes.cpp:0:0
#13 0x000055627d344b73 M::DebugInfo::DebugInfoDialect::printType(mlir::Type, mlir::DialectAsmPrinter&) const DebugInfoTypes.cpp:0:0
#14 0x000055627fb74de3 mlir::AsmPrinter::Impl::printDialectType(mlir::Type) AsmPrinter.cpp:0:0
#15 0x000055627fb76ab7 mlir::Type::print(llvm::raw_ostream&, mlir::AsmState&) const AsmPrinter.cpp:0:0
#16 0x000055627d877589 mlir::bytecode::detail::IRNumberingState::number(mlir::Type) IRNumbering.cpp:0:0
#17 0x000055627d337d6d (anonymous namespace)::DebugInfoDialectBytecodeInterface::writeType(mlir::Type, mlir::DialectBytecodeWriter&) const DebugInfoDialect.cpp:0:0
#18 0x000055627d87750d mlir::bytecode::detail::IRNumberingState::number(mlir::Type) IRNumbering.cpp:0:0
#19 0x000055627d337938 (anonymous namespace)::DebugInfoDialectBytecodeInterface::writeAttribute(mlir::Attribute, mlir::DialectBytecodeWriter&) const DebugInfoDialect.cpp:0:0
#20 0x000055627d8767cd mlir::bytecode::detail::IRNumberingState::number(mlir::Attribute) IRNumbering.cpp:0:0
#21 0x000055627d3377da (anonymous namespace)::DebugInfoDialectBytecodeInterface::writeAttribute(mlir::Attribute, mlir::DialectBytecodeWriter&) const DebugInfoDialect.cpp:0:0
#22 0x000055627d8767cd mlir::bytecode::detail::IRNumberingState::number(mlir::Attribute) IRNumbering.cpp:0:0
#23 0x000055627fbc3eda (anonymous namespace)::BuiltinDialectBytecodeInterface::writeAttribute(mlir::Attribute, mlir::DialectBytecodeWriter&) const BuiltinDialectBytecode.cpp:0:0
#24 0x000055627d8767cd mlir::bytecode::detail::IRNumberingState::number(mlir::Attribute) IRNumbering.cpp:0:0
#25 0x000055627d876287 mlir::bytecode::detail::IRNumberingState::number(mlir::Operation&) IRNumbering.cpp:0:0
#26 0x000055627d876f73 mlir::bytecode::detail::IRNumberingState::number(mlir::Block&) IRNumbering.cpp:0:0
#27 0x000055627d8763b4 mlir::bytecode::detail::IRNumberingState::number(mlir::Region&) IRNumbering.cpp:0:0
#28 0x000055627d875761 mlir::bytecode::detail::IRNumberingState::IRNumberingState(mlir::Operation*, mlir::BytecodeWriterConfig const&) IRNumbering.cpp:0:0
#29 0x000055627d86a312 mlir::writeBytecodeToFile(mlir::Operation*, llvm::raw_ostream&, mlir::BytecodeWriterConfig const&) BytecodeWriter.cpp:0:0
#30 0x000055627d30a109 void llvm::detail::UniqueFunctionBase<void, M::AsyncRT::AsyncValueRef<std::vector<mlir::Diagnostic, std::allocatormlir::Diagnostic > >&&>::CallImpl<M::Cache::cachedTransform(mlir::Operation*, M::RCRef<M::Cache::BlobCache<M::Cache::TransformCacheKey> >, M::AsyncRT::AnyAsyncValueRef, mlir::PassManager&, std::function<void (mlir::Operation*)> const&, std::function<void (mlir::Operation*)> const&)::$_0::operator()(mlir::Operation*, M::RCRef<M::WriteableBuffer>, M::AsyncRT::AnyAsyncValueRef) const::'lambda'(M::AsyncRT::AsyncValueRef<std::vector<mlir::Diagnostic, std::allocatormlir::Diagnostic > >&&)>(void*, M::AsyncRT::AsyncValueRef<std::vector<mlir::Diagnostic, std::allocatormlir::Diagnostic > >&) CachedTransform.cpp:0:0
#31 0x000055627d309c67 void M::AsyncRT::AsyncValueRef<std::vector<mlir::Diagnostic, std::allocatormlir::Diagnostic > >::andThen(llvm::unique_function<void (M::AsyncRT::AsyncValueRef<std::vector<mlir::Diagnostic, std::allocatormlir::Diagnostic > >&&)>&&) && CachedTransform.cpp:0:0
#32 0x000055627d309430 M::AsyncRT::AnyAsyncValueRef llvm::detail::UniqueFunctionBase<M::AsyncRT::AnyAsyncValueRef, M::RCRef<M::WriteableBuffer>, M::AsyncRT::AnyAsyncValueRef>::CallImpl<M::AsyncRT::AnyAsyncValueRef M::Cache::cachedTransform<M::Cache::cachedTransform(mlir::Operation*, M::RCRef<M::Cache::BlobCache<M::Cache::TransformCacheKey> >, M::AsyncRT::AnyAsyncValueRef, mlir::PassManager&, std::function<void (mlir::Operation*)> const&, std::function<void (mlir::Operation*)> const&)::$_0, M::Cache::cachedTransform(mlir::Operation*, M::RCRef<M::Cache::BlobCache<M::Cache::TransformCacheKey> >, M::AsyncRT::AnyAsyncValueRef, mlir::PassManager&, std::function<void (mlir::Operation*)> const&, std::function<void (mlir::Operation*)> const&)::$_1>(mlir::Operation*, M::RCRef<M::Cache::BlobCache<M::Cache::TransformCacheKey> >, M::AsyncRT::AnyAsyncValueRef, M::RCRef<M::WriteableBuffer>, M::Cache::cachedTransform(mlir::Operation*, M::RCRef<M::Cache::BlobCache<M::Cache::TransformCacheKey> >, M::AsyncRT::AnyAsyncValueRef, mlir::PassManager&, std::function<void (mlir::Operation*)> const&, std::function<void (mlir::Operation*)> const&)::$_0&&, M::Cache::cachedTransform(mlir::Operation*, M::RCRef<M::Cache::BlobCache<M::Cache::TransformCacheKey> >, M::AsyncRT::AnyAsyncValueRef, mlir::PassManager&, std::function<void (mlir::Operation*)> const&, std::function<void (mlir::Operation*)> const&)::$_1&&)::'lambda'(M::RCRef<M::WriteableBuffer>, M::AsyncRT::AnyAsyncValueRef)>(void*, M::RCRef<M::WriteableBuffer>&, M::AsyncRT::AnyAsyncValueRef&) CachedTransform.cpp:0:0
#33 0x000055627d308e2b void llvm::detail::UniqueFunctionBase<void, M::AsyncRT::AsyncValueRef<std::optional<M::RCRef<M::Buffer> > >&&>::CallImpl<M::AsyncRT::AnyAsyncValueRef M::Cache::cachedTransform<M::AsyncRT::AnyAsyncValueRef M::Cache::cachedTransform<M::Cache::cachedTransform(mlir::Operation*, M::RCRef<M::Cache::BlobCache<M::Cache::TransformCacheKey> >, M::AsyncRT::AnyAsyncValueRef, mlir::PassManager&, std::function<void (mlir::Operation*)> const&, std::function<void (mlir::Operation*)> const&)::$_0, M::Cache::cachedTransform(mlir::Operation*, M::RCRef<M::Cache::BlobCache<M::Cache::TransformCacheKey> >, M::AsyncRT::AnyAsyncValueRef, mlir::PassManager&, std::function<void (mlir::Operation*)> const&, std::function<void (mlir::Operation*)> const&)::$_1>(mlir::Operation*, M::RCRef<M::Cache::BlobCache<M::Cache::TransformCacheKey> >, M::AsyncRT::AnyAsyncValueRef, M::RCRef<M::WriteableBuffer>, M::Cache::cachedTransform(mlir::Operation*, M::RCRef<M::Cache::BlobCache<M::Cache::TransformCacheKey> >, M::AsyncRT::AnyAsyncValueRef, mlir::PassManager&, std::function<void (mlir::Operation*)> const&, std::function<void (mlir::Operation*)> const&)::$_0&&, M::Cache::cachedTransform(mlir::Operation*, M::RCRef<M::Cache::BlobCache<M::Cache::TransformCacheKey> >, M::AsyncRT::AnyAsyncValueRef, mlir::PassManager&, std::function<void (mlir::Operation*)> const&, std::function<void (mlir::Operation*)> const&)::$_1&&)::'lambda'(M::RCRef<M::WriteableBuffer>, M::AsyncRT::AnyAsyncValueRef)>(M::AsyncRT::EncodedLocation, M::RCRef<M::Cache::BlobCache<M::Cache::TransformCacheKey> > const&, M::AsyncRT::AnyAsyncValueRef, M::RCRef<M::WriteableBuffer>, M::Cache::cachedTransform(mlir::Operation*, M::RCRef<M::Cache::BlobCache<M::Cache::TransformCacheKey> >, M::AsyncRT::AnyAsyncValueRef, mlir::PassManager&, std::function<void (mlir::Operation*)> const&, std::function<void (mlir::Operation*)> const&)::$_0, llvm::unique_function<M::AsyncRT::AnyAsyncValueRef (M::RCRef<M::Buffer>)>, bool)::'lambda'(M::AsyncRT::AsyncValueRef<std::optional<M::RCRef<M::Buffer> > >&&)>(void*, M::AsyncRT::AsyncValueRef<std::optional<M::RCRef<M::Buffer> > >&) CachedTransform.cpp:0:0
#34 0x000055627d31297d void (anonymous namespace)::WorkQueueThread::runItemsImpl<(anonymous namespace)::ThreadPoolWorkQueue::await(llvm::ArrayRef<M::AsyncRT::AnyAsyncValueRef>)::$_2, (anonymous namespace)::ThreadPoolWorkQueue::await(llvm::ArrayRef<M::AsyncRT::AnyAsyncValueRef>)::$_3>((anonymous namespace)::ThreadPoolWorkQueue::await(llvm::ArrayRef<M::AsyncRT::AnyAsyncValueRef>)::$_2, (anonymous namespace)::ThreadPoolWorkQueue::await(llvm::ArrayRef<M::AsyncRT::AnyAsyncValueRef>)::$_3, bool, llvm::StringLiteral, llvm::StringLiteral) ThreadPoolWorkQueue.cpp:0:0
#35 0x000055627f8a8659 M::Detail::runWithThreadAffinityLinux(unsigned long, llvm::function_ref<void ()>&) ThreadAffinity.cpp:0:0
#36 0x000055627f8a89fd M::runWithThreadAffinity(unsigned long, llvm::function_ref<void ()>) ThreadAffinity.cpp:0:0
#37 0x000055627d313b0c M::AsyncRT::runWithThreadAffinity(unsigned long, llvm::function_ref<void ()>) ThreadAffinity.cpp:0:0
#38 0x000055627d3115bc (anonymous namespace)::ThreadPoolWorkQueue::await(llvm::ArrayRef<M::AsyncRT::AnyAsyncValueRef>) ThreadPoolWorkQueue.cpp:0:0
#39 0x000055627ceb72bf M::KGEN::KGENCompiler::runKGENPipeline(mlir::ModuleOp, M::TargetInfoAttr, M::RCRef<M::Cache::BlobCache<M::Cache::TransformCacheKey> >, M::AsyncRT::AnyAsyncValueRef, std::function<void (mlir::Operation*)>, std::function<void (mlir::Operation*)>) KGENCompiler.cpp:0:0
#40 0x000055627ceb6ada M::KGEN::KGENCompiler::runKGENPipeline(mlir::ModuleOp, M::TargetInfoAttr) KGENCompiler.cpp:0:0
#41 0x000055627cd2ad0a run(M::State const&) mojo-run.cpp:0:0
#42 0x000055627cd34f2c main mojo.cpp:0:0
#43 0x00007fd27306fd90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#44 0x00007fd27306fe40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#45 0x000055627cd09525 _start (/home/fastrl_mojo_user/.vscode-server/data/User/globalStorage/modular-mojotools.vscode-mojo-nightly/magic-data-home/envs/max/bin/mojo+0x25d1525)
mojo crashed!
Please file a bug report.
Segmentation fault (core dumped)

[josiahls]

Another weird wrinkle here:

@value
struct AstNode:
    var parent: List[ArcPointer[Self]]

fn make_graph(path:Path) raises -> ArcPointer[AstNode]:...

In another module:

node = AstNode(...) # seg faults

But

node = make_graph(...) # works fine

This is still related to self referencial stuff