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[SR-10289] Crash in Swift._StringObject.getSharedUTF8Start() #52689

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jpsim opened this issue Apr 3, 2019 · 5 comments
Open

[SR-10289] Crash in Swift._StringObject.getSharedUTF8Start() #52689

jpsim opened this issue Apr 3, 2019 · 5 comments
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. standard library Area: Standard library umbrella

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@jpsim
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jpsim commented Apr 3, 2019

Previous ID SR-10289
Radar None
Original Reporter @jpsim
Type Bug
Environment

Apple Swift version 5.0 (swiftlang-1001.0.69.5 clang-1001.0.46.3)
Xcode Version 10.2 (10E125)
iOS Simulator iPhone XS Max iOS 12.1

Additional Detail from JIRA
Votes 0
Component/s Standard Library
Labels Bug
Assignee None
Priority Medium

Watchers: @shahmishal

md5: 130ea2eeb372e793bb08779472c1f61b

Issue Description:

I'm sorry I don't have steps to reproduce, but I experienced this in an iOS Simulator run of my app and wanted to report it.

* thread #​1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x18)
    frame #&#8203;0: 0x00000001142ef33b libswiftCore.dylib`function signature specialization <Arg[0] = Exploded> of Swift._StringObject.getSharedUTF8Start() -> Swift.UnsafePointer<Swift.UInt8> + 27
    frame #&#8203;1: 0x00000001142ef361 libswiftCore.dylib`function signature specialization <Arg[0] = Exploded> of Swift._StringObject.sharedUTF8.getter : Swift.UnsafeBufferPointer<Swift.UInt8> + 17
    frame #&#8203;2: 0x000000011423de05 libswiftCore.dylib`function signature specialization <Arg[0] = [Closure Propagated : closure #&#8203;2 (Swift.UInt8) -> () in Swift._StringGutsSlice._normalizedHash(into: inout Swift.Hasher) -> (), Argument Types : [Swift.Hasher]> of Swift._StringGutsSlice._withNFCCodeUnits((Swift.UInt8) throws -> ()) throws -> () + 6917
    frame #&#8203;3: 0x000000011423bef5 libswiftCore.dylib`Swift._StringGutsSlice._normalizedHash(into: inout Swift.Hasher) -> () + 213
    frame #&#8203;4: 0x00000001142f3d95 libswiftCore.dylib`function signature specialization <Arg[1] = Exploded> of Swift.String.hash(into: inout Swift.Hasher) -> () + 245
    frame #&#8203;5: 0x00000001140f60d9 libswiftCore.dylib`protocol witness for Swift.Hashable._rawHashValue(seed: Swift.Int) -> Swift.Int in conformance Swift.Character : Swift.Hashable in Swift + 153
    frame #&#8203;6: 0x0000000114384ce9 libswiftCore.dylib`protocol witness for Swift.Hashable._rawHashValue(seed: Swift.Int) -> Swift.Int in conformance Swift.String : Swift.Hashable in Swift + 9
    frame #&#8203;7: 0x00000001141542a3 libswiftCore.dylib`Swift._NativeDictionary.setValue(_: __owned B, forKey: A, isUnique: Swift.Bool) -> () + 131
    frame #&#8203;8: 0x0000000114132218 libswiftCore.dylib`Swift.Dictionary._Variant.setValue(_: __owned B, forKey: A) -> () + 280
    frame #&#8203;9: 0x0000000114323400 libswiftCore.dylib`function signature specialization <Arg[1] = Owned To Guaranteed> of Swift.Dictionary.subscript.setter : (A) -> Swift.Optional<B> + 304
    frame #&#8203;10: 0x00000001140fe172 libswiftCore.dylib`Swift.Dictionary.subscript.setter : (A) -> Swift.Optional<B> + 18
  * frame #&#8203;11: 0x000000010416dab0 [REDACTED]
    frame #&#8203;12: 0x000000010416f380 [REDACTED]
    frame #&#8203;13: 0x00000001035217bb [REDACTED]
    frame #&#8203;14: 0x0000000103523254 [REDACTED]
    frame #&#8203;15: 0x000000011d124bde UIKitCore`-[UIApplication _handleDelegateCallbacksWithOptions:isSuspended:restoreState:] + 280
    frame #&#8203;16: 0x000000011d1265cb UIKitCore`-[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 3979
    frame #&#8203;17: 0x000000011d12bc2f UIKitCore`-[UIApplication _runWithMainScene:transitionContext:completion:] + 1623
    frame #&#8203;18: 0x000000011c94a4e9 UIKitCore`__111-[__UICanvasLifecycleMonitor_Compatability _scheduleFirstCommitForScene:transition:firstActivation:completion:]_block_invoke + 866
    frame #&#8203;19: 0x000000011c95329c UIKitCore`+[_UICanvas _enqueuePostSettingUpdateTransactionBlock:] + 153
    frame #&#8203;20: 0x000000011c94a126 UIKitCore`-[__UICanvasLifecycleMonitor_Compatability _scheduleFirstCommitForScene:transition:firstActivation:completion:] + 233
    frame #&#8203;21: 0x000000011c94aae0 UIKitCore`-[__UICanvasLifecycleMonitor_Compatability activateEventsOnly:withContext:completion:] + 1085
    frame #&#8203;22: 0x000000011c948cb5 UIKitCore`__82-[_UIApplicationCanvas _transitionLifecycleStateWithTransitionContext:completion:]_block_invoke + 795
    frame #&#8203;23: 0x000000011c94895f UIKitCore`-[_UIApplicationCanvas _transitionLifecycleStateWithTransitionContext:completion:] + 435
    frame #&#8203;24: 0x000000011c94da90 UIKitCore`__125-[_UICanvasLifecycleSettingsDiffAction performActionsForCanvas:withUpdatedScene:settingsDiff:fromSettings:transitionContext:]_block_invoke + 584
    frame #&#8203;25: 0x000000011c94e80e UIKitCore`_performActionsWithDelayForTransitionContext + 100
    frame #&#8203;26: 0x000000011c94d7ef UIKitCore`-[_UICanvasLifecycleSettingsDiffAction performActionsForCanvas:withUpdatedScene:settingsDiff:fromSettings:transitionContext:] + 221
    frame #&#8203;27: 0x000000011c95293a UIKitCore`-[_UICanvas scene:didUpdateWithDiff:transitionContext:completion:] + 392
    frame #&#8203;28: 0x000000011d12a44e UIKitCore`-[UIApplication workspace:didCreateScene:withTransitionContext:completion:] + 515
    frame #&#8203;29: 0x000000011ccced09 UIKitCore`-[UIApplicationSceneClientAgent scene:didInitializeWithEvent:completion:] + 357
    frame #&#8203;30: 0x0000000119dbe2da FrontBoardServices`-[FBSSceneImpl _didCreateWithTransitionContext:completion:] + 448
    frame #&#8203;31: 0x0000000119dc9443 FrontBoardServices`__56-[FBSWorkspace client:handleCreateScene:withCompletion:]_block_invoke_2 + 271
    frame #&#8203;32: 0x0000000119dc8b3a FrontBoardServices`__40-[FBSWorkspace _performDelegateCallOut:]_block_invoke + 53
    frame #&#8203;33: 0x000000011664e602 libdispatch.dylib`_dispatch_client_callout + 8
    frame #&#8203;34: 0x0000000116651b78 libdispatch.dylib`_dispatch_block_invoke_direct + 301
    frame #&#8203;35: 0x0000000119dfdba8 FrontBoardServices`__FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__ + 30
    frame #&#8203;36: 0x0000000119dfd860 FrontBoardServices`-[FBSSerialQueue _performNext] + 457
    frame #&#8203;37: 0x0000000119dfde40 FrontBoardServices`-[FBSSerialQueue _performNextFromRunLoopSource] + 45
    frame #&#8203;38: 0x0000000111ac8721 CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
    frame #&#8203;39: 0x0000000111ac7f93 CoreFoundation`__CFRunLoopDoSources0 + 243
    frame #&#8203;40: 0x0000000111ac263f CoreFoundation`__CFRunLoopRun + 1263
    frame #&#8203;41: 0x0000000111ac1e11 CoreFoundation`CFRunLoopRunSpecific + 625
    frame #&#8203;42: 0x000000011590d1dd GraphicsServices`GSEventRunModal + 62
    frame #&#8203;43: 0x000000011d12d81d UIKitCore`UIApplicationMain + 140
    frame #&#8203;44: 0x00000001035269bb [REDACTED]
    frame #&#8203;45: 0x00000001166c4575 libdyld.dylib`start + 1
@belkadan
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belkadan commented Apr 4, 2019

@milseman, @Catfish-Man, anything useful here?

@milseman
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milseman mannequin commented Apr 4, 2019

Nothing off the top of my head; I haven't seen this backtrace before.

edit: An asserts build of the standard library would likely show more information, as as crash here would probably be caught by an invariant check earlier. What's the best way for a developer to get and use a toolchain with stdlib asserts enabled?

@belkadan
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belkadan commented Apr 4, 2019

Hm, I don't think we enable stdlib assertions in our nightly snapshots, just compiler assertions. @shahmishal, is there a way to ask CI to build a toolchain using a specific preset?

@shahmishal
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Sorry we don’t currently support this feature with PR testing.

@milseman
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milseman mannequin commented Apr 4, 2019

That would be immensely useful for debugging, especially in cases like this where we don't have access to the developer's code. It's a little more official to be say "download and try this toolchain from swift.org" than "download and try this toolchain I built from .... dropbox?"

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. standard library Area: Standard library umbrella
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@jpsim @belkadan @shahmishal