Compiler crash when using FoundationXML.XMLDocument

[tristanlabelle]

Description

Using FoundationXML.XMLDocument crashes the compiler.

Reproduction

import FoundationXML
_ = try XMLDocument(xmlString: "foo", options: [])

swift build

Stack dump

D:\Throwaway\Swift>swift build
Building for debugging...
error: compile command failed due to exception 3 (use -v to see invocation)
Assertion failed: Val && "isa<> used on a null pointer", file D:\r\_work\swift-build\swift-build\SourceCache\llvm-project\llvm\include\llvm/Support/Casting.h, line 109
Please submit a bug report (https://swift.org/contributing/#reporting-bugs) and include the crash backtrace.
Stack dump:
0.      Program arguments: C:\\Users\\tristan\\AppData\\Local\\Programs\\Swift\\Toolchains\\0.0.0+Asserts\\usr\\bin\\swift-frontend.exe -frontend -c -primary-file D:\\Throwaway\\Swift\\Sources\\main.swift -emit-dependencies-path D:\\Throwaway\\Swift\\.build\\x86_64-unknown-windows-msvc\\debug\\Throwaway.build\\main.d -emit-reference-dependencies-path D:\\Throwaway\\Swift\\.build\\x86_64-unknown-windows-msvc\\debug\\Throwaway.build\\main.swiftdeps -target x86_64-unknown-windows-msvc -disable-objc-interop -sdk C:\\Users\\tristan\\AppData\\Local\\Programs\\Swift\\Platforms\\0.0.0\\Windows.platform\\Developer\\SDKs\\Windows.sdk\\ -I D:\\Throwaway\\Swift\\.build\\x86_64-unknown-windows-msvc\\debug\\Modules -I C:\\Users\\tristan\\AppData\\Local\\Programs\\Swift\\Platforms\\0.0.0\\Windows.platform\\Developer\\Library\\XCTest-development\\usr\\lib\\swift\\windows -I C:\\Users\\tristan\\AppData\\Local\\Programs\\Swift\\Platforms\\0.0.0\\Windows.platform\\Developer\\Library\\XCTest-development\\usr\\lib\\swift\\windows\\x86_64 -color-diagnostics -enable-testing -g -debug-info-format=dwarf -dwarf-version=4 -module-cache-path D:\\Throwaway\\Swift\\.build\\x86_64-unknown-windows-msvc\\debug\\ModuleCache -swift-version 6 -Onone -D SWIFT_PACKAGE -D DEBUG -empty-abi-descriptor -resource-dir C:\\Users\\tristan\\AppData\\Local\\Programs\\Swift\\Toolchains\\0.0.0+Asserts\\usr\\lib\\swift -enable-anonymous-context-mangled-names -file-compilation-dir D:\\Throwaway\\Swift -Xcc -D_MT -Xcc -D_DLL -Xcc -Xclang -Xcc --dependent-lib=msvcrt -Xcc -gdwarf -module-name Throwaway -package-name swift -in-process-plugin-server-path C:\\Users\\tristan\\AppData\\Local\\Programs\\Swift\\Toolchains\\0.0.0+Asserts\\usr\\bin\\SwiftInProcPluginServer.dll -plugin-path C:\\Users\\tristan\\AppData\\Local\\Programs\\Swift\\Toolchains\\0.0.0+Asserts\\usr\\bin -plugin-path C:\\Users\\tristan\\AppData\\Local\\Programs\\Swift\\Toolchains\\0.0.0+Asserts\\usr\\local\\bin -o D:\\Throwaway\\Swift\\.build\\x86_64-unknown-windows-msvc\\debug\\Throwaway.build\\main.swift.o -index-store-path D:\\Throwaway\\Swift\\.build\\x86_64-unknown-windows-msvc\\debug\\index\\store -index-system-modules
1.      compnerd.org Swift version 6.1-dev (LLVM 95f3fb07f8f5294, Swift 8cb2f10c392c03d)
2.      Compiling with the current language version
3.      While reading from module 'FoundationXML', builder version '6.1(6.1)/compnerd.org Swift version 6.1-dev (LLVM 95f3fb07f8f5294, Swift 8cb2f10c392c03d)', built from source against SDK , non-resilient, loaded from 'C:\Users\tristan\AppData\Local\Programs\Swift\Platforms\0.0.0\Windows.platform\Developer\SDKs\Windows.sdk\usr\lib\swift\windows\FoundationXML.swiftmodule\x86_64-unknown-windows-msvc.swiftmodule'
4.      While deserializing '_NSXMLParserExternalEntityWithURL' (FuncDecl @ 1207524) in 'FoundationXML'
5.          ...decl is named '_NSXMLParserExternalEntityWithURL(_:urlStr:identifier:context:originalLoaderFunction:)'
6.      While deserializing 'originalLoaderFunction' (ParamDecl @ 1341440) in 'FoundationXML'
7.          ...decl is named 'originalLoaderFunction'
Exception Code: 0x80000003
 #0 0x00007ff6bbc63945 (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x6383945)      
 #1 0x00007ffa6f8fe6d5 (C:\WINDOWS\System32\ucrtbase.dll+0x7e6d5)
 #2 0x00007ffa6f8ff6e1 (C:\WINDOWS\System32\ucrtbase.dll+0x7f6e1)
 #3 0x00007ffa6f90108e (C:\WINDOWS\System32\ucrtbase.dll+0x8108e)
 #4 0x00007ffa6f9012d1 (C:\WINDOWS\System32\ucrtbase.dll+0x812d1)
 #5 0x00007ff6b6e7d7a7 (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x159d7a7)      
 #6 0x00007ff6b6e83f4f (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x15a3f4f)      
 #7 0x00007ff6b6e7d1e2 (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x159d1e2)
 #8 0x00007ff6b6e882ef (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x15a82ef)      
 #9 0x00007ff6b6e7d564 (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x159d564)      
#10 0x00007ff6b6e882ef (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x15a82ef)      
#11 0x00007ff6b6e7da6c (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x159da6c)      
#12 0x00007ff6b6e83f4f (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x15a3f4f)      
#13 0x00007ff6b6e7d1e2 (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x159d1e2)      
#14 0x00007ff6b6e89e4a (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x15a9e4a)      
#15 0x00007ff6b6e7ca0d (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x159ca0d)      
#16 0x00007ff6b6e882ef (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x15a82ef)      
#17 0x00007ff6b6e8455f (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x15a455f)      
#18 0x00007ff6b6e7d1fc (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x159d1fc)      
#19 0x00007ff6b6e882ef (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x15a82ef)      
#20 0x00007ff6b6e7d500 (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x159d500)      
#21 0x00007ff6b6e882ef (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x15a82ef)      
#22 0x00007ff6b6e7d564 (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x159d564)      
#23 0x00007ff6b6e6b649 (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x158b649)      
#24 0x00007ff6b6e4dcd0 (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x156dcd0)      
#25 0x00007ff6b6e74e40 (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x1594e40)      
#26 0x00007ff6b6e746ca (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x15946ca)      
#27 0x00007ff6b6e61790 (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x1581790)      
#28 0x00007ff6b6e6d5d5 (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x158d5d5)      
#29 0x00007ff6b6e6c804 (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x158c804)      
#30 0x00007ff6b6e8694b (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x15a694b)      
#31 0x00007ff6b6e4ffdb (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x156ffdb)      
#32 0x00007ff6b6e6d75b (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x158d75b)      
#33 0x00007ff6b6e6c804 (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x158c804)      
#34 0x00007ff6b6de289c (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x150289c)      
#35 0x00007ff6b6d76eb6 (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x1496eb6)      
#36 0x00007ff6b773a4a6 (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x1e5a4a6)      
#37 0x00007ff6b773a79f (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x1e5a79f)      
#38 0x00007ff6b6d0a7b1 (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x142a7b1)      
#39 0x00007ff6b60731d0 (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x7931d0)       
#40 0x00007ff6b606f990 (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x78f990)       
#41 0x00007ff6b6066027 (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x786027)       
#42 0x00007ff6b6064f04 (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x784f04)       
#43 0x00007ff6b60695f0 (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x7895f0)       
#44 0x00007ff6b6068b7d (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x788b7d)       
#45 0x00007ff6b5e9a99f (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x5ba99f)       
#46 0x00007ff6b5e9dc5b (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x5bdc5b)       
#47 0x00007ff6b5e9b274 (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x5bb274)       
#48 0x00007ff6b5e9ce66 (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x5bce66)       
#49 0x00007ff6b5e9d39f (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x5bd39f)       
#50 0x00007ff6b5e9bf88 (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x5bbf88)       
#51 0x00007ff6b5e9c512 (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x5bc512)       
#52 0x00007ff6b5e9e345 (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x5be345)       
#53 0x00007ff6b5cf27fc (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x4127fc)
#54 0x00007ff6b5cf23cc (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x4123cc)       
#55 0x00007ff6bbcc3cfc (C:\Users\tristan\AppData\Local\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x63e3cfc)      
#56 0x00007ffa6fe7257d (C:\WINDOWS\System32\KERNEL32.DLL+0x1257d)
#57 0x00007ffa7212af08 (C:\WINDOWS\SYSTEM32\ntdll.dll+0x5af08)

Expected behavior

Should build fine

Environment

compnerd.org Swift version 6.1-dev (LLVM 95f3fb07f8f5294, Swift 8cb2f10)
Target: x86_64-unknown-windows-msvc

Browser company main branch build 20241015.2

Additional information

No response

[tristanlabelle]

FYI @compnerd

[kateinoigakukun]

This issue is reproducible on x86_64-unknown-linux too. I made a small reproducer as follows, and I found that 9c44b79 (#76903) is the first reproducible commit by git-bisect.

It seems like the reproducible condition is a use of incomplete struct in a function type through typedef in a Clang module header.

@ahatanaka Would you mind taking a look at this? Thanks in advance 🙏

#!/bin/bash

set -ex

cd "$(dirname "$0")"

rm -rf ./swift

SWIFT_FRONTEND=${SWIFT_FRONTEND:?"SWIFT_FRONTEND is not set"}


cat <<EOF > ChibiStdlib.swift
precedencegroup AssignmentPrecedence {
  assignment: true
  associativity: right
}

public typealias Void = ()

@frozen
public struct OpaquePointer {
  @usableFromInline
  internal var _rawValue: Builtin.RawPointer

  @usableFromInline @_transparent
  internal init(_ v: Builtin.RawPointer) {
    self._rawValue = v
  }
}
EOF

$SWIFT_FRONTEND -c ChibiStdlib.swift -parse-stdlib -emit-module -emit-module-path ./swift/linux/Swift.swiftmodule/x86_64-unknown-linux-gnu.swiftmodule -module-name Swift -disable-implicit-string-processing-module-import -disable-implicit-concurrency-module-import -o /dev/null -target x86_64-unknown-linux-gnu


mkdir -p include
cat <<EOF > include/MyCFXMLInterface.h
#if !defined(__COREFOUNDATION_CFXMLINTERFACE__)
#define __COREFOUNDATION_CFXMLINTERFACE__ 1

typedef struct _xmlParserCtxt *_CFXMLInterfaceParserContext;

typedef void (*_CFXMLInterfaceExternalEntityLoader)(_CFXMLInterfaceParserContext);

#endif
EOF
cat <<EOF > include/module.modulemap
module _MyCFXMLInterface {
  header "MyCFXMLInterface.h"
}
EOF
cat <<EOF > XMLParser.swift
@_implementationOnly import _MyCFXMLInterface

func _NSXMLParserExternalEntityWithURL(originalLoaderFunction: _CFXMLInterfaceExternalEntityLoader) {}
EOF

$SWIFT_FRONTEND -c XMLParser.swift -parse-as-library -emit-module -emit-module-path swift/linux/MyFoundationXML.swiftmodule/x86_64-unknown-linux-gnu.swiftmodule -module-name MyFoundationXML -module-link-name MyFoundationXML -resource-dir ./swift -O -I ./include -o /dev/null -target x86_64-unknown-linux-gnu


cat <<EOF > Check.swift
import MyFoundationXML
EOF

$SWIFT_FRONTEND -c Check.swift -o /dev/null -index-store-path /tmp/index-store -index-system-modules -resource-dir ./swift -parse-stdlib -target x86_64-unknown-linux-gnu

[ahatanaka]

I haven't been able to reproduce the crash. I'm reverting the commit for now. #77309

[kateinoigakukun]

@ahatanaka Thank you for your quick response 🙏
I slightly adjusted my reproducer to make it work on macOS. Let me know if you can't still reproduce the issue.

$ SWIFT_FRONTEND=$HOME/Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-10-30-a/usr/bin/swift-frontend bash t.sh
++ dirname t.sh
+ cd .
+ rm -rf ./swift
+ SWIFT_FRONTEND=/Users/katei/Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-10-30-a/usr/bin/swift-frontend
+ cat
+ /Users/katei/Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-10-30-a/usr/bin/swift-frontend -c ChibiStdlib.swift -parse-stdlib -emit-module -emit-module-path ./swift/linux/Swift.swiftmodule/x86_64-unknown-linux-gnu.swiftmodule -module-name Swift -disable-implicit-string-processing-module-import -disable-implicit-concurrency-module-import -o /dev/null -target x86_64-unknown-linux-gnu
t.sh: line 32: /Users/katei/Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-10-30-a/usr/bin/swift-frontend: No such file or directory
tmp.Dlq4JePPap$ SWIFT_FRONTEND=$HOME/Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-10-30-a.xctoolchain/usr/bin/swift-frontend bash t.sh
++ dirname t.sh
+ cd .
+ rm -rf ./swift
+ SWIFT_FRONTEND=/Users/katei/Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-10-30-a.xctoolchain/usr/bin/swift-frontend
+ cat
+ /Users/katei/Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-10-30-a.xctoolchain/usr/bin/swift-frontend -c ChibiStdlib.swift -parse-stdlib -emit-module -emit-module-path ./swift/linux/Swift.swiftmodule/x86_64-unknown-linux-gnu.swiftmodule -module-name Swift -disable-implicit-string-processing-module-import -disable-implicit-concurrency-module-import -o /dev/null -target x86_64-unknown-linux-gnu
<unknown>:0: warning: libc not found for 'x86_64-unknown-linux-gnu'; C stdlib may be unavailable
+ mkdir -p include
+ cat
+ cat
+ cat
+ /Users/katei/Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-10-30-a.xctoolchain/usr/bin/swift-frontend -c XMLParser.swift -parse-as-library -emit-module -emit-module-path swift/linux/MyFoundationXML.swiftmodule/x86_64-unknown-linux-gnu.swiftmodule -module-name MyFoundationXML -module-link-name MyFoundationXML -resource-dir ./swift -O -I ./include -o /dev/null -target x86_64-unknown-linux-gnu
<unknown>:0: warning: libc not found for 'x86_64-unknown-linux-gnu'; C stdlib may be unavailable
<unknown>:0: warning: unable to perform implicit import of "_Concurrency" module: no such module found
<unknown>:0: remark: unable to perform implicit import of "_StringProcessing" module: no such module found
XMLParser.swift:1:22: warning: using '@_implementationOnly' without enabling library evolution for 'MyFoundationXML' may lead to instability during execution
1 | @_implementationOnly import _MyCFXMLInterface
  |                      `- warning: using '@_implementationOnly' without enabling library evolution for 'MyFoundationXML' may lead to instability during execution
2 |
3 | func _NSXMLParserExternalEntityWithURL(originalLoaderFunction: _CFXMLInterfaceExternalEntityLoader) {}
+ cat
+ /Users/katei/Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-10-30-a.xctoolchain/usr/bin/swift-frontend -c Check.swift -o /dev/null -index-store-path /tmp/index-store -index-system-modules -resource-dir ./swift -parse-stdlib -target x86_64-unknown-linux-gnu
<unknown>:0: warning: libc not found for 'x86_64-unknown-linux-gnu'; C stdlib may be unavailable
Assertion failed: (Val && "isa<> used on a null pointer"), function doit, file Casting.h, line 109.
Please submit a bug report (https://swift.org/contributing/#reporting-bugs) and include the crash backtrace.
Stack dump:
0.      Program arguments: /Users/katei/Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-10-30-a.xctoolchain/usr/bin/swift-frontend -c Check.swift -o /dev/null -index-store-path /tmp/index-store -index-system-modules -resource-dir ./swift -parse-stdlib -target x86_64-unknown-linux-gnu
1.      Apple Swift version 6.1-dev (LLVM 9d655fdc6103926, Swift 0d16cbf5d5ef6f9)
2.      Compiling with effective version 5.10
3.      While reading from module 'MyFoundationXML', builder version '6.1(5.10)/Apple Swift version 6.1-dev (LLVM 9d655fdc6103926, Swift 0d16cbf5d5ef6f9)', built from source against SDK 23E224, non-resilient, loaded from './swift/linux/MyFoundationXML.swiftmodule/x86_64-unknown-linux-gnu.swiftmodule'
4.      While deserializing '_NSXMLParserExternalEntityWithURL' (FuncDecl @ 133438) in 'MyFoundationXML'
5.          ...decl is named '_NSXMLParserExternalEntityWithURL(originalLoaderFunction:)'
6.      While deserializing 'originalLoaderFunction' (ParamDecl @ 133804) in 'MyFoundationXML'
7.          ...decl is named 'originalLoaderFunction'
Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it):
0  swift-frontend           0x000000010a780e0c llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 56
1  swift-frontend           0x000000010a77f4f0 llvm::sys::RunSignalHandlers() + 112
2  swift-frontend           0x000000010a781468 SignalHandler(int) + 304
3  libsystem_platform.dylib 0x000000019338f584 _sigtramp + 56
4  libsystem_pthread.dylib  0x000000019335ec20 pthread_kill + 288
5  libsystem_c.dylib        0x000000019326ba20 abort + 180
6  libsystem_c.dylib        0x000000019326ad10 err + 0
7  swift-frontend           0x000000010aaf2580 clang::serialization::AbstractTypeReader<(anonymous namespace)::SwiftToClangBasicReader>::readRecordType() (.cold.3) + 0
8  swift-frontend           0x0000000105a54df0 clang::serialization::AbstractTypeReader<(anonymous namespace)::SwiftToClangBasicReader>::readRecordType() + 140
9  swift-frontend           0x0000000105a52fb8 clang::serialization::AbstractTypeReader<(anonymous namespace)::SwiftToClangBasicReader>::readElaboratedType() + 136
10 swift-frontend           0x0000000105a548c0 clang::serialization::AbstractTypeReader<(anonymous namespace)::SwiftToClangBasicReader>::readPointerType() + 88
11 swift-frontend           0x0000000105a55208 clang::serialization::AbstractTypeReader<(anonymous namespace)::SwiftToClangBasicReader>::readTypedefType() + 104
12 swift-frontend           0x0000000105a52fb8 clang::serialization::AbstractTypeReader<(anonymous namespace)::SwiftToClangBasicReader>::readElaboratedType() + 136
13 swift-frontend           0x0000000105a557ac swift::DataStreamBasicReader<(anonymous namespace)::SwiftToClangBasicReader>::readQualType() + 80
14 swift-frontend           0x0000000105a59064 llvm::ArrayRef<clang::QualType> clang::serialization::DataStreamBasicReader<(anonymous namespace)::SwiftToClangBasicReader>::readArray<clang::QualType>(llvm::SmallVectorImpl<clang::QualType>&) + 108
15 swift-frontend           0x0000000105a5345c clang::serialization::AbstractTypeReader<(anonymous namespace)::SwiftToClangBasicReader>::readFunctionProtoType() + 452
16 swift-frontend           0x0000000105a54704 clang::serialization::AbstractTypeReader<(anonymous namespace)::SwiftToClangBasicReader>::readParenType() + 88
17 swift-frontend           0x0000000105a548c0 clang::serialization::AbstractTypeReader<(anonymous namespace)::SwiftToClangBasicReader>::readPointerType() + 88
18 swift-frontend           0x0000000105a32a38 swift::ModuleFile::getClangType(llvm::PointerEmbeddedInt<unsigned int, 31>) + 604
19 swift-frontend           0x0000000105a320dc swift::serialization::decls_block::detail::function_deserializer::deserialize(swift::ModuleFile&, llvm::SmallVectorImpl<unsigned long long>&, llvm::StringRef, bool) + 712
20 swift-frontend           0x0000000105a1824c swift::ModuleFile::getTypeChecked(llvm::PointerEmbeddedInt<unsigned int, 31>) + 884
21 swift-frontend           0x0000000105a2bb20 swift::DeclDeserializer::deserializeParam(llvm::ArrayRef<unsigned long long>, llvm::StringRef) + 704
22 swift-frontend           0x0000000105a234c8 swift::DeclDeserializer::getDeclCheckedImpl(llvm::function_ref<bool (swift::DeclAttributes)>) + 832
23 swift-frontend           0x0000000105a16db4 swift::ModuleFile::getDeclChecked(llvm::PointerEmbeddedInt<unsigned int, 31>, llvm::function_ref<bool (swift::DeclAttributes)>) + 560
24 swift-frontend           0x0000000105a16848 swift::ModuleFile::readParameterList() + 260
25 swift-frontend           0x0000000105a465ec swift::DeclDeserializer::deserializeAnyFunc(llvm::ArrayRef<unsigned long long>, llvm::StringRef, bool) + 3480
26 swift-frontend           0x0000000105a234e8 swift::DeclDeserializer::getDeclCheckedImpl(llvm::function_ref<bool (swift::DeclAttributes)>) + 864
27 swift-frontend           0x0000000105a16db4 swift::ModuleFile::getDeclChecked(llvm::PointerEmbeddedInt<unsigned int, 31>, llvm::function_ref<bool (swift::DeclAttributes)>) + 560
28 swift-frontend           0x0000000105a7c274 swift::ModuleFile::getTopLevelDecls(llvm::SmallVectorImpl<swift::Decl*>&, llvm::function_ref<bool (swift::DeclAttributes)>) + 172
29 swift-frontend           0x000000010650146c swift::FileUnit::walk(swift::ASTWalker&) + 96
30 swift-frontend           0x00000001064fa974 swift::ModuleDecl::walk(swift::ASTWalker&) + 92
31 swift-frontend           0x00000001059daa28 swift::SourceEntityWalker::walk(swift::ModuleDecl&) + 200
32 swift-frontend           0x0000000104e19630 (anonymous namespace)::IndexSwiftASTWalker::visitModule(swift::ModuleDecl&) + 328
33 swift-frontend           0x0000000104e197e4 swift::index::indexModule(swift::ModuleDecl*, swift::index::IndexDataConsumer&) + 368
34 swift-frontend           0x0000000104e229f4 addModuleDependencies(llvm::ArrayRef<swift::ImportedModule>, llvm::StringRef, bool, bool, bool, bool, bool, llvm::StringRef, clang::CompilerInstance const&, swift::DiagnosticEngine&, clang::index::IndexUnitWriter&, (anonymous namespace)::StringScratchSpace&, swift::PathRemapper const&, swift::SourceFile*) + 4876
35 swift-frontend           0x0000000104e20dd4 recordSourceFileUnit(swift::SourceFile*, llvm::StringRef, llvm::StringRef, bool, bool, bool, bool, bool, bool, llvm::StringRef, llvm::ArrayRef<clang::FileEntryRef>, clang::CompilerInstance const&, swift::PathRemapper const&, swift::DiagnosticEngine&) + 680
36 swift-frontend           0x0000000104e215c4 swift::index::indexAndRecord(swift::ModuleDecl*, llvm::ArrayRef<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>, llvm::StringRef, llvm::StringRef, bool, bool, bool, bool, bool, bool, llvm::StringRef, swift::DependencyTracker const&, swift::PathRemapper const&) + 636
37 swift-frontend           0x0000000104c9c740 emitIndexDataForSourceFile(swift::SourceFile*, swift::CompilerInstance const&) + 588
38 swift-frontend           0x0000000104c9a874 performEndOfPipelineActions(swift::CompilerInstance&) + 5772
39 swift-frontend           0x0000000104c98a28 generateCode(swift::CompilerInstance&, llvm::StringRef, llvm::Module*, llvm::GlobalVariable*) + 404
40 swift-frontend           0x0000000104c94ec4 performCompileStepsPostSILGen(swift::CompilerInstance&, std::__1::unique_ptr<swift::SILModule, std::__1::default_delete<swift::SILModule>>, llvm::PointerUnion<swift::ModuleDecl*, swift::SourceFile*>, swift::PrimarySpecificPaths const&, int&, swift::FrontendObserver*) + 1476
41 swift-frontend           0x0000000104c944ec swift::performCompileStepsPostSema(swift::CompilerInstance&, int&, swift::FrontendObserver*) + 1224
42 swift-frontend           0x0000000104ca0788 withSemanticAnalysis(swift::CompilerInstance&, swift::FrontendObserver*, llvm::function_ref<bool (swift::CompilerInstance&)>, bool) + 160
43 swift-frontend           0x0000000104c96180 performCompile(swift::CompilerInstance&, int&, swift::FrontendObserver*) + 716
44 swift-frontend           0x0000000104c9584c swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 2328
45 swift-frontend           0x0000000104a7125c swift::mainEntry(int, char const**) + 3100
46 dyld                     0x0000000192fd60e0 start + 2360
t.sh: line 64: 86049 Abort trap: 6           $SWIFT_FRONTEND -c Check.swift -o /dev/null -index-store-path /tmp/index-store -index-system-modules -resource-dir ./swift -parse-stdlib -target x86_64-unknown-linux-gnu