Xcode 8.3.x: Swift 3.1 compiler crash (Segmentation fault: 11)

Originator:rsfinn
Number:rdar://31803589 Date Originated:2017-04-24
Status:Closed Resolved:
Product:Developer Tools Product Version:Xcode 8.3.2
Classification:Crash Reproducible:Always
 
Summary:
Building a complex project with Xcode 8.3 reliably crashes the Swift compiler in a particular source file.  I have been able to reduce the project to a relatively small sample project that crashes the compiler in the same way.  The crash occurred in each of Xcode 8.3, 8.3.1, and 8.3.2.

Steps to Reproduce:
1. Install Xcode 8.3.x (x = 0, 1, 2)
2. Open and build the attached project.

Expected Results:
The project build should complete (possibly with compiler errors) without the Swift compiler crashing.

Actual Results:
The Swift compiler crashes when trying to compile the file "main.swift".

Version:
Xcode version 8.3.2 (8E2002)
Apple LLVM version 8.1.0 (clang-802.0.42)
macOS 10.12.4 (16E195)

Comments

Fixed in Xcode 9 beta 3

The compiler crash no longer occurs when building the project using the compiler in Xcode 9 beta 3 (9M174d).

By rsfinn at July 20, 2017, 2:35 a.m. (reply...)

Workaround

I have discovered that moving the declaration of an enum type that was nested inside a class method definition
to the same level as the method definition suffices to avoid the compiler crash.

By rsfinn at April 25, 2017, 3:56 a.m. (reply...)

Crash log attached to bug report

Process:               swift [6563]
Path:                  /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift
Identifier:            swift
Version:               802.0.53
Code Type:             X86-64 (Native)
Parent Process:        swift [6561]
Responsible:           swift [6563]
User ID:               501

Date/Time:             2017-04-24 22:43:08.521 -0400
OS Version:            Mac OS X 10.12.4 (16E195)
Report Version:        12
Anonymous UUID:        F50F54C2-17B9-0CA5-5783-00047FC20EF0

Sleep/Wake UUID:       FCB158FB-1589-48CE-8491-8C135FBBD2D6

Time Awake Since Boot: 25000 seconds
Time Since Wake:       1200 seconds

System Integrity Protection: disabled

Crashed Thread:        0  Dispatch queue: com.apple.main-thread

Exception Type:        EXC_BAD_ACCESS (SIGSEGV)
Exception Codes:       KERN_INVALID_ADDRESS at 0x0000000000000000
Exception Note:        EXC_CORPSE_NOTIFY

Termination Signal:    Segmentation fault: 11
Termination Reason:    Namespace SIGNAL, Code 0xb
Terminating Process:   exc handler [0]

VM Regions Near 0:
--> 
    __TEXT                 000000010a890000-000000010e164000 [ 56.8M] r-x/rwx SM=COW  /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   swift          0x000000010b994757 swift::TypeBase::getCanonicalType() + 23
1   swift          0x000000010b1a8a3b swift::ASTVisitor<(anonymous namespace)::StmtEmitter, void, void, void, void, void, void>::visit(swift::Stmt*) + 1227
2   swift          0x000000010b1abdc8 swift::ASTVisitor<(anonymous namespace)::StmtEmitter, void, void, void, void, void, void>::visit(swift::Stmt*) + 14424
3   swift          0x000000010b16b723 swift::Lowering::SILGenFunction::emitClosure(swift::AbstractClosureExpr*) + 451
4   swift          0x000000010b0f1739 swift::Lowering::SILGenModule::emitClosure(swift::AbstractClosureExpr*) + 1081
5   swift          0x000000010b15f079 (anonymous namespace)::RValueEmitter::visitAbstractClosureExpr(swift::AbstractClosureExpr*, swift::Lowering::SGFContext) + 41
6   swift          0x000000010b108193 (anonymous namespace)::ArgEmitter::emit(swift::Lowering::ArgumentSource&&, swift::Lowering::AbstractionPattern) + 6979
7   swift          0x000000010b108b44 (anonymous namespace)::ArgEmitter::emitExpanded(swift::Lowering::ArgumentSource&&, swift::Lowering::AbstractionPattern) + 228
8   swift          0x000000010b10676e (anonymous namespace)::ArgEmitter::emit(swift::Lowering::ArgumentSource&&, swift::Lowering::AbstractionPattern) + 286
9   swift          0x000000010b10b14d (anonymous namespace)::ArgEmitter::emitShuffle(swift::Expr*, swift::Expr*, llvm::ArrayRef, swift::ConcreteDeclRef, llvm::ArrayRef, llvm::ArrayRef, llvm::ArrayRef, swift::Type, swift::Lowering::AbstractionPattern) + 3677
10  swift          0x000000010b109206 (anonymous namespace)::ArgEmitter::emitExpanded(swift::Lowering::ArgumentSource&&, swift::Lowering::AbstractionPattern) + 1958
11  swift          0x000000010b10676e (anonymous namespace)::ArgEmitter::emit(swift::Lowering::ArgumentSource&&, swift::Lowering::AbstractionPattern) + 286
12  swift          0x000000010b105dd6 (anonymous namespace)::CallSite::emit(swift::Lowering::SILGenFunction&, swift::Lowering::AbstractionPattern, (anonymous namespace)::ParamLowering&, llvm::SmallVectorImpl&, llvm::SmallVectorImpl >&, llvm::Optional const&, swift::ImportAsMemberStatus const&) && + 438
13  swift          0x000000010b10312b (anonymous namespace)::CallEmission::apply(swift::Lowering::SGFContext) + 6123
14  swift          0x000000010b14ee7c swift::ASTVisitor<(anonymous namespace)::RValueEmitter, swift::Lowering::RValue, void, void, void, void, void, swift::Lowering::SGFContext>::visit(swift::Expr*, swift::Lowering::SGFContext) + 124
15  swift          0x000000010b161ed6 swift::Lowering::SILGenFunction::emitIgnoredExpr(swift::Expr*) + 598
16  swift          0x000000010b1abe4a swift::ASTVisitor<(anonymous namespace)::StmtEmitter, void, void, void, void, void, void>::visit(swift::Stmt*) + 14554
17  swift          0x000000010b16b509 swift::Lowering::SILGenFunction::emitFunction(swift::FuncDecl*) + 409
18  swift          0x000000010b0ec89b swift::Lowering::SILGenModule::emitFunction(swift::FuncDecl*)::$_1::operator()(swift::SILFunction*) const + 1867
19  swift          0x000000010b0eb8a2 swift::Lowering::SILGenModule::emitFunction(swift::FuncDecl*) + 642
20  swift          0x000000010b1b0efb (anonymous namespace)::SILGenType::emitType() + 971
21  swift          0x000000010b1b0acd swift::Lowering::SILGenModule::visitNominalTypeDecl(swift::NominalTypeDecl*) + 29
22  swift          0x000000010b0f8ecb swift::Lowering::SILGenModule::emitSourceFile(swift::SourceFile*, unsigned int) + 1483
23  swift          0x000000010b0faaa9 swift::SILModule::constructSIL(swift::ModuleDecl*, swift::SILOptions&, swift::FileUnit*, llvm::Optional, bool, bool) + 1593
24  swift          0x000000010a90b604 swift::performFrontend(llvm::ArrayRef, char const*, void*, swift::FrontendObserver*) + 42516
25  swift          0x000000010a8bad6c main + 9052
26  libdyld.dylib  0x00007fff92a51235 start + 1

Thread 0 crashed with X86 Thread State (64-bit):
  rax: 0x00007fff55369820  rbx: 0x00007fd21b018af0  rcx: 0x000000010b1ac450  rdx: 0x0000000000000007
  rdi: 0x0000000000000000  rsi: 0x00007fd2189d70f8  rbp: 0x00007fff55365eb0  rsp: 0x00007fff55365d80
   r8: 0x000000007fffffff   r9: 0x00007fd21a522270  r10: 0x0000000000000001  r11: 0x0000000000000001
  r12: 0x00007fd2189d70f8  r13: 0x00007fff55366300  r14: 0x0000000000000000  r15: 0x0000000000000000
  rip: 0x000000010b994757  rfl: 0x0000000000010202  cr2: 0x0000000000000000
  
Logical CPU:     6
Error Code:      0x00000004
Trap Number:     14

Binary Images:
       0x10a890000 -        0x10e163fff +swift (802.0.53) <4A0E4F71-4627-3875-A1A1-5BC81D57E58B> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift
       0x1185b3000 -        0x1185f0dc7  dyld (433.5) <8239D0D7-66F6-3C44-A77F-586F74525DA3> /usr/lib/dyld
    0x7fff914a9000 -     0x7fff914aaffb  libSystem.B.dylib (1238.51.1)  /usr/lib/libSystem.B.dylib
    0x7fff915e3000 -     0x7fff91639ff7  libc++.1.dylib (307.5) <0B43BB5D-E6EB-3464-8DE9-B41AC8ED9D1C> /usr/lib/libc++.1.dylib
    0x7fff9163a000 -     0x7fff91664fff  libc++abi.dylib (307.3) <30199352-88BF-30BD-8CFF-2A4FBE247523> /usr/lib/libc++abi.dylib
    0x7fff91a7b000 -     0x7fff91a99ff3  libedit.3.dylib (48.50.1) <5880F20C-5732-3285-B4F8-E2CBB464D950> /usr/lib/libedit.3.dylib
    0x7fff920aa000 -     0x7fff920dbffb  libncurses.5.4.dylib (51.30.1)  /usr/lib/libncurses.5.4.dylib
    0x7fff92157000 -     0x7fff92529047  libobjc.A.dylib (709)  /usr/lib/libobjc.A.dylib
    0x7fff92955000 -     0x7fff92966ff3  libz.1.dylib (67) <46E3FFA2-4328-327A-8D34-A03E20BFFB8E> /usr/lib/libz.1.dylib
    0x7fff92975000 -     0x7fff92979ff7  libcache.dylib (79) <093A4DAB-8385-3D47-A350-E20CB7CCF7BF> /usr/lib/system/libcache.dylib
    0x7fff9297a000 -     0x7fff92984fff  libcommonCrypto.dylib (60092.50.5)  /usr/lib/system/libcommonCrypto.dylib
    0x7fff92985000 -     0x7fff9298cfff  libcompiler_rt.dylib (62) <55D47421-772A-32AB-B529-1A46C2F43B4D> /usr/lib/system/libcompiler_rt.dylib
    0x7fff9298d000 -     0x7fff92995fff  libcopyfile.dylib (138) <819BEA3C-DF11-3E3D-A1A1-5A51C5BF1961> /usr/lib/system/libcopyfile.dylib
    0x7fff92996000 -     0x7fff92a19fdf  libcorecrypto.dylib (442.50.19) <8A39EE06-121C-3731-A9E9-35847064B3EE> /usr/lib/system/libcorecrypto.dylib
    0x7fff92a1a000 -     0x7fff92a4bfff  libdispatch.dylib (703.50.37)  /usr/lib/system/libdispatch.dylib
    0x7fff92a4c000 -     0x7fff92a51ffb  libdyld.dylib (433.5) <129D3B44-FB21-3750-9A68-48B5C3DC632B> /usr/lib/system/libdyld.dylib
    0x7fff92a52000 -     0x7fff92a52ffb  libkeymgr.dylib (28) <7AA011A9-DC21-3488-BF73-3B5B14D1FDD6> /usr/lib/system/libkeymgr.dylib
    0x7fff92a60000 -     0x7fff92a60fff  liblaunch.dylib (972.50.27) <037D198D-9B02-3EF9-A8E9-6F43EA555A9E> /usr/lib/system/liblaunch.dylib
    0x7fff92a61000 -     0x7fff92a66ff3  libmacho.dylib (898) <17D5D855-F6C3-3B04-B680-E9BF02EF8AED> /usr/lib/system/libmacho.dylib
    0x7fff92a67000 -     0x7fff92a69ff3  libquarantine.dylib (85.50.1) <7B32EA91-AB8B-32A4-8E52-9D3ED46CAC8E> /usr/lib/system/libquarantine.dylib
    0x7fff92a6a000 -     0x7fff92a6bffb  libremovefile.dylib (45) <38D4CB9C-10CD-30D3-8B7B-A515EC75FE85> /usr/lib/system/libremovefile.dylib
    0x7fff92a6c000 -     0x7fff92a84ff7  libsystem_asl.dylib (349.50.5) <096E4228-3B7C-30A6-8B13-EC909A64499A> /usr/lib/system/libsystem_asl.dylib
    0x7fff92a85000 -     0x7fff92a85ff7  libsystem_blocks.dylib (67) <10DC5404-73AB-35B3-A277-A8AFECB476EB> /usr/lib/system/libsystem_blocks.dylib
    0x7fff92a86000 -     0x7fff92b13fef  libsystem_c.dylib (1158.50.2)  /usr/lib/system/libsystem_c.dylib
    0x7fff92b14000 -     0x7fff92b17ffb  libsystem_configuration.dylib (888.51.2) <872C8A42-0871-3424-830B-84E587A75D27> /usr/lib/system/libsystem_configuration.dylib
    0x7fff92b18000 -     0x7fff92b1bfff  libsystem_coreservices.dylib (41.4)  /usr/lib/system/libsystem_coreservices.dylib
    0x7fff92b1c000 -     0x7fff92b34fff  libsystem_coretls.dylib (121.50.4)  /usr/lib/system/libsystem_coretls.dylib
    0x7fff92b35000 -     0x7fff92b3bfff  libsystem_dnssd.dylib (765.50.9)  /usr/lib/system/libsystem_dnssd.dylib
    0x7fff92b3c000 -     0x7fff92b65ff7  libsystem_info.dylib (503.50.4) <611DB84C-BF70-3F92-8702-B9F28A900920> /usr/lib/system/libsystem_info.dylib
    0x7fff92b66000 -     0x7fff92b88ff7  libsystem_kernel.dylib (3789.51.2)  /usr/lib/system/libsystem_kernel.dylib
    0x7fff92b89000 -     0x7fff92bd0fe7  libsystem_m.dylib (3121.6)  /usr/lib/system/libsystem_m.dylib
    0x7fff92bd1000 -     0x7fff92befff7  libsystem_malloc.dylib (116.50.8) <48D1BBA3-914E-3C65-AF70-C33B4A1B5233> /usr/lib/system/libsystem_malloc.dylib
    0x7fff92bf0000 -     0x7fff92c49ffb  libsystem_network.dylib (856.50.56)  /usr/lib/system/libsystem_network.dylib
    0x7fff92c4a000 -     0x7fff92c53ff3  libsystem_networkextension.dylib (563.50.32)  /usr/lib/system/libsystem_networkextension.dylib
    0x7fff92c54000 -     0x7fff92c5dff3  libsystem_notify.dylib (165.20.1)  /usr/lib/system/libsystem_notify.dylib
    0x7fff92c5e000 -     0x7fff92c66fe7  libsystem_platform.dylib (126.50.8) <5940EAB7-84D6-34DC-9B38-111648B2B589> /usr/lib/system/libsystem_platform.dylib
    0x7fff92c67000 -     0x7fff92c71ff7  libsystem_pthread.dylib (218.51.1) <62A84A68-431D-3B54-A7B6-31367CCF2884> /usr/lib/system/libsystem_pthread.dylib
    0x7fff92c72000 -     0x7fff92c75ff7  libsystem_sandbox.dylib (592.50.47) <87A2327D-B7A1-3E4C-A85D-D3D9484003DB> /usr/lib/system/libsystem_sandbox.dylib
    0x7fff92c76000 -     0x7fff92c77ff3  libsystem_secinit.dylib (24.50.4)  /usr/lib/system/libsystem_secinit.dylib
    0x7fff92c78000 -     0x7fff92c7fffb  libsystem_symptoms.dylib (532.50.47) <9CF6A47C-8343-3E85-9C27-A8D98E726A8B> /usr/lib/system/libsystem_symptoms.dylib
    0x7fff92c80000 -     0x7fff92c93ff7  libsystem_trace.dylib (518.51.1)  /usr/lib/system/libsystem_trace.dylib
    0x7fff92c94000 -     0x7fff92c99ffb  libunwind.dylib (35.3) <3D50D8A8-C460-334D-A519-2DA841102C6B> /usr/lib/system/libunwind.dylib
    0x7fff92c9a000 -     0x7fff92cc3ff7  libxpc.dylib (972.50.27)  /usr/lib/system/libxpc.dylib

External Modification Summary:
  Calls made by other processes targeting this process:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0
  Calls made by this process:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0
  Calls made by all processes on this machine:
    task_for_pid: 20416
    thread_create: 0
    thread_set_state: 0

VM Region Summary:
ReadOnly portion of Libraries: Total=185.2M resident=0K(0%) swapped_out_or_unallocated=185.2M(100%)
Writable regions: Total=111.1M written=0K(0%) resident=0K(0%) swapped_out=0K(0%) unallocated=111.1M(100%)
 
                                VIRTUAL   REGION 
REGION TYPE                        SIZE    COUNT (non-coalesced) 
===========                     =======  ======= 
Kernel Alloc Once                    8K        2 
MALLOC                           102.8M       23 
MALLOC guard page                   16K        4 
STACK GUARD                       56.0M        2 
Stack                             8192K        2 
VM_ALLOCATE (reserved)             256K        2         reserved VM address space (unallocated)
__DATA                            4216K       46 
__LINKEDIT                       120.1M        4 
__TEXT                            65.1M       44 
mapped file                       56.7M        9 
shared memory                        8K        3 
===========                     =======  ======= 
TOTAL                            413.0M      130 
TOTAL, minus reserved VM space   412.8M      130
By rsfinn at April 25, 2017, 3:04 a.m. (reply...)

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