'Swift async functions with Task.sleep in it causes segmentation fault
I'm learning Swift concurrency now, and I've written some code to have a try on it. I've expected the "photo" with greater id to be "downloaded" earlier.
func downloadPhoto(id: Int) async -> String {
print("Download started")
let total = 3
try! await Task.sleep(nanoseconds: UInt64(total - id) * 1_000_000_000)
print("Download ended")
let str = "Photo \(id)"
print(str + " downloaded")
return str
}
Task{
print("Program started")
async let firstPhoto = downloadPhoto(id: 0)
async let secondPhoto = downloadPhoto(id: 1)
async let thirdPhoto = downloadPhoto(id: 2)
let photos = await [firstPhoto, secondPhoto, thirdPhoto]
print(photos)
}
However, when I saved the code to test.swift and run it with swift test.swift, I got the following output:
Program started
Download started
Download started
Download started
That is, none of the code after Task.sleep executed. To find out what's going wrong, I changed
try! await Task.sleep(nanoseconds: UInt64(total - id) * 1_000_000_000)
to
try! await Task.sleep(nanoseconds: 3)
and this time I got the expected output,
Program started
Download started
Download started
Download started
Download ended
Download ended
Photo 1 downloaded
Download ended
Photo 2 downloaded
Photo 0 downloaded
["Photo 0", "Photo 1", "Photo 2"]
Then, I changed the parameter 3 to 300000 and ran again. This time I got
Program started
Download started
Download started
Download started
Please submit a bug report (https://swift.org/contributing/#reporting-bugs) and include the project and the crash backtrace.
zsh: segmentation fault swift test.swift
I don't know why the first version doesn't yield a segmentation fault message, nor do I know why there is a segmentation fault. Seems that once the time to sleep grows large enough to some degree the segmentation fault occurs.
Here is the crash log:
-------------------------------------
Translated Report (Full Report Below)
-------------------------------------
Process: swift-frontend [72033]
Path: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift-frontend
Identifier: swift-frontend
Version: ???
Code Type: ARM-64 (Native)
Parent Process: zsh [70066]
Responsible: Terminal [70064]
User ID: 501
Date/Time: 2022-02-17 00:08:58.2001 +0800
OS Version: macOS 12.2.1 (21D62)
Report Version: 12
Anonymous UUID: 7B963A0A-2299-D9C6-8085-A5F2F172ABC9
Sleep/Wake UUID: A1819DA4-A7E6-453F-AC28-5B0CD7C84E42
Time Awake Since Boot: 330000 seconds
Time Since Wake: 2804 seconds
System Integrity Protection: enabled
Crashed Thread: 1 Dispatch queue: com.apple.root.user-initiated-qos.cooperative
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000108364208
Exception Codes: 0x0000000000000001, 0x0000000108364208
Exception Note: EXC_CORPSE_NOTIFY
VM Region Info: 0x108364208 is not in any region. Bytes after previous region: 521 Bytes before following region: 581549560
REGION TYPE START - END [ VSIZE] PRT/MAX SHRMOD REGION DETAIL
mapped file 108330000-108364000 [ 208K] r--/r-- SM=COW ...t_id=be3988bd
---> GAP OF 0x22a9c000 BYTES
MALLOC_TINY 12ae00000-12af00000 [ 1024K] rw-/rwx SM=PRV
Thread 0:: Dispatch queue: com.apple.main-thread
0 libsystem_malloc.dylib 0x1a7698e18 szone_free_definite_size + 240
1 swift-frontend 0x101db5258 swift::GenericSignatureBuilder::EquivalenceClass::~EquivalenceClass() + 408
2 swift-frontend 0x101db5258 swift::GenericSignatureBuilder::EquivalenceClass::~EquivalenceClass() + 408
3 swift-frontend 0x101d91950 swift::GenericSignatureBuilder::Implementation::~Implementation() + 392
4 swift-frontend 0x101bfa0c4 swift::ASTContext::Implementation::Arena::~Arena() + 716
5 swift-frontend 0x101bdafb4 swift::ASTContext::~ASTContext() + 288
6 swift-frontend 0x100e9fd5c swift::CompilerInstance::~CompilerInstance() + 316
7 swift-frontend 0x100d685b4 swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 2488
8 swift-frontend 0x100cc2df8 main + 932
9 dyld 0x1072910f4 start + 520
Thread 1 Crashed:: Dispatch queue: com.apple.root.user-initiated-qos.cooperative
0 ??? 0x108364208 ???
1 libswift_Concurrency.dylib 0x2257fb7b0 swift_job_runImpl(swift::Job*, swift::ExecutorRef) + 76
2 libdispatch.dylib 0x1a76d431c _dispatch_root_queue_drain + 396
3 libdispatch.dylib 0x1a76d4b58 _dispatch_worker_thread2 + 164
4 libsystem_pthread.dylib 0x1a787d2c8 _pthread_wqthread + 228
5 libsystem_pthread.dylib 0x1a787c018 start_wqthread + 8
Thread 2:: Dispatch queue: com.apple.root.user-initiated-qos.cooperative
0 libsystem_kernel.dylib 0x1a78463a8 access + 8
1 swift-frontend 0x104ff2dac llvm::sys::fs::access(llvm::Twine const&, llvm::sys::fs::AccessMode) + 84
2 swift-frontend 0x104ff6120 llvm::sys::findProgramByName(llvm::StringRef, llvm::ArrayRef<llvm::StringRef>) + 416
3 swift-frontend 0x104ff6ea8 printSymbolizedStackTrace(llvm::StringRef, void**, int, llvm::raw_ostream&) + 588
4 swift-frontend 0x104ff79f0 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 100
5 swift-frontend 0x104ff6acc llvm::sys::RunSignalHandlers() + 128
6 swift-frontend 0x104ff8004 SignalHandler(int) + 292
7 libsystem_platform.dylib 0x1a78984e4 _sigtramp + 56
8 libswift_Concurrency.dylib 0x2257fad6c swift::runJobInEstablishedExecutorContext(swift::Job*) + 280
9 libswift_Concurrency.dylib 0x2257fb7b0 swift_job_runImpl(swift::Job*, swift::ExecutorRef) + 76
10 libdispatch.dylib 0x1a76d431c _dispatch_root_queue_drain + 396
11 libdispatch.dylib 0x1a76d4b58 _dispatch_worker_thread2 + 164
12 libsystem_pthread.dylib 0x1a787d2c8 _pthread_wqthread + 228
13 libsystem_pthread.dylib 0x1a787c018 start_wqthread + 8
Thread 3:: Dispatch queue: com.apple.root.user-initiated-qos.cooperative
0 ??? 0x108364208 ???
1 libswift_Concurrency.dylib 0x2257fb7b0 swift_job_runImpl(swift::Job*, swift::ExecutorRef) + 76
2 libdispatch.dylib 0x1a76d431c _dispatch_root_queue_drain + 396
3 libdispatch.dylib 0x1a76d4b58 _dispatch_worker_thread2 + 164
4 libsystem_pthread.dylib 0x1a787d2c8 _pthread_wqthread + 228
5 libsystem_pthread.dylib 0x1a787c018 start_wqthread + 8
Thread 4:
0 libsystem_pthread.dylib 0x1a787c010 start_wqthread + 0
Thread 1 crashed with ARM Thread State (64-bit):
x0: 0x0000000108364208 x1: 0x000000010720b200 x2: 0x000000013af06e90 x3: 0x0000000000000001
x4: 0x000000000000000e x5: 0x0000000000000001 x6: 0x0000000000000000 x7: 0x0000000000000000
x8: 0x000000013b8f3c98 x9: 0x000000000000290b x10: 0x00000000000efc50 x11: 0x0000000000179f41
x12: 0x000000013af00000 x13: 0x0000000000000000 x14: 0x000000005d61b963 x15: 0x000000000000bb0a
x16: 0x000000066f80f7b4 x17: 0x0000000108364208 x18: 0x0000000000000000 x19: 0x000000013b8ecb90
x20: 0x0000000000000000 x21: 0x000000013b8f4040 x22: 0x000000013b8f3c90 x23: 0x000000016f1db0e0
x24: 0x000000013b8ecb90 x25: 0x0000000000000000 x26: 0x0000000232b23e38 x27: 0x0000000000000000
x28: 0x000000016f1db0e0 fp: 0x000000016f1dae90 lr: 0x00000002257fad6c
sp: 0x000000016f1dae60 pc: 0x0000000108364208 cpsr: 0x60001000
far: 0x0000000108364208 esr: 0x82000007 (Instruction Abort) Translation fault
Binary Images:
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0x100cac000 - 0x105e23fff swift-frontend (*) <a80c4d84-e9ff-3e38-8e35-666b1f91f585> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift-frontend
0x10728c000 - 0x1072ebfff dyld (*) <d21a73ea-79cd-36eb-8ac9-2c5cf5181a27> /usr/lib/dyld
0x0 - 0xffffffffffffffff ??? (*) <00000000-0000-0000-0000-000000000000> ???
0x2257bd000 - 0x225810fff libswift_Concurrency.dylib (*) <50b9f80c-f39b-3792-b642-1ff1684a50b3> /usr/lib/swift/libswift_Concurrency.dylib
0x1a76bf000 - 0x1a7705fff libdispatch.dylib (*) <93e1dcfc-ef56-3113-8e7c-1ba85266a93b> /usr/lib/system/libdispatch.dylib
0x1a787a000 - 0x1a7886fff libsystem_pthread.dylib (*) <f7b2eccf-e6f1-3109-ae81-9028c0b8332a> /usr/lib/system/libsystem_pthread.dylib
0x1a7844000 - 0x1a7879fff libsystem_kernel.dylib (*) <384945e6-dd71-37e5-9a3d-84fff14a1e60> /usr/lib/system/libsystem_kernel.dylib
0x1a7894000 - 0x1a789bfff libsystem_platform.dylib (*) <49cf1536-27e5-3a34-9724-d75552cbab56> /usr/lib/system/libsystem_platform.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: 40
thread_create: 0
thread_set_state: 2506
VM Region Summary:
ReadOnly portion of Libraries: Total=684.4M resident=0K(0%) swapped_out_or_unallocated=684.4M(100%)
Writable regions: Total=813.9M written=0K(0%) resident=0K(0%) swapped_out=0K(0%) unallocated=813.9M(100%)
VIRTUAL REGION
REGION TYPE SIZE COUNT (non-coalesced)
=========== ======= =======
Activity Tracing 256K 1
Kernel Alloc Once 32K 1
MALLOC 179.2M 18
MALLOC guard page 96K 5
MALLOC_MEDIUM (reserved) 240.0M 2 reserved VM address space (unallocated)
MALLOC_NANO (reserved) 384.0M 1 reserved VM address space (unallocated)
STACK GUARD 56.1M 5
Stack 10.1M 5
VM_ALLOCATE 1.0G 1
VM_ALLOCATE (reserved) 256K 1 reserved VM address space (unallocated)
__AUTH 112K 14
__AUTH_CONST 219K 44
__DATA 765K 43
__DATA_CONST 4898K 46
__DATA_DIRTY 164K 23
__LINKEDIT 590.7M 3
__OBJC_CONST 12K 6
__OBJC_RO 82.1M 1
__OBJC_RW 3104K 1
__TEXT 93.6M 49
dyld private memory 1024K 1
mapped file 14.9M 5
shared memory 32K 2
=========== ======= =======
TOTAL 2.6G 278
TOTAL, minus reserved VM space 2.0G 278
-----------
Full Report
-----------
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"SIRI_DICTATION_ASSETS" : "61fb0e87c773c43cde3bb80e"
},
"deploymentId" : 240000305
},
{
"rolloutId" : "5fc94383418129005b4e9ae0",
"factorPackIds" : {
},
"deploymentId" : 240000231
},
{
"rolloutId" : "5ffde50ce2aacd000d47a95f",
"factorPackIds" : {
},
"deploymentId" : 240000106
},
{
"rolloutId" : "601d9415f79519000ccd4b69",
"factorPackIds" : {
"SIRI_TEXT_TO_SPEECH" : "620161cb295c182621eced20"
},
"deploymentId" : 240000389
}
],
"experiments" : [
]
}
}
I think maybe I misunderstood the way to use Task.sleep. I'd appreciate it if someone could tell me why the segment fault occurs and how to fix it. Thanks!
Sources
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Source: Stack Overflow
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