lldb: Unchecked Expected<T> contained error: invalid type

[rjmansfield]

~/swift-DEVELOPMENT-SNAPSHOT-2024-07-03-a-ubuntu22.04/usr/bin/lldb  ~/date 
(lldb) target create "/home/ryan_mansfield/date"
Current executable set to '/home/ryan_mansfield/date' (x86_64).
(lldb) b LockedState.swift:115
Breakpoint 1: no locations (pending).
WARNING:  Unable to resolve breakpoint to any actual locations.
(lldb) r
Process 1592276 launched: '/home/ryan_mansfield/date' (x86_64)
2 locations added to breakpoint 1
Process 1592276 stopped
* thread #1, name = 'date', stop reason = breakpoint 1.1
    frame #0: 0x00007ffff719ada5 libFoundationEssentials.so`LockedState.withLock<A>(_:) [inlined] closure #1 (state=<unavailable>, lock=0x555555570cc0, body=0x00007ffff722dee0 libFoundationEssentials.so`closure #1 @Sendable (inout Swift.Optional<FoundationEssentials._CalendarProtocol>) -> Swift.Optional<FoundationEssentials._CalendarProtocol> in FoundationEssentials.CalendarCache.current.getter : FoundationEssentials._CalendarProtocol at Calendar_Cache.swift:51) throws -> τ_1_0 in FoundationEssentials.LockedState.withLockUnchecked<τ_0_0>((inout τ_0_0) throws -> τ_1_0) throws -> τ_1_0 at LockedState.swift:117:24 [opt]
   114 	        try _buffer.withUnsafeMutablePointers { state, lock in
   115 	            _Lock.lock(lock)
   116 	            defer { _Lock.unlock(lock) }
-> 117 	            return try body(&state.pointee)
   118 	        }
   119 	    }
   120 	
Target 1: (date) stopped.
warning: libFoundationEssentials.so was compiled with optimization - stepping may behave oddly; variables may not be available.
error: ld-linux-x86-64.so.2 0x00001c42: DW_TAG_member '__size' refers to type 0x0000000000001c5b which extends beyond the bounds of 0x00001c2d
(lldb) s
Process 1592276 stopped
* thread #1, name = 'date', stop reason = step in
    frame #0: 0x00007ffff722def5 libFoundationEssentials.so`closure #1 in CalendarCache.current.getter($0=<unavailable>) at Calendar_Cache.swift:51:48 [opt]
   48  	    }
   49  	    
   50  	    var current: any _CalendarProtocol {
-> 51  	        if let result = _current.withLock({ $0 }) {
   52  	            return result
   53  	        }
   54  	                        
Target 1: (date) stopped.
(lldb) s
Process 1592276 stopped
* thread #1, name = 'date', stop reason = step in
    frame #0: 0x00007ffff719adb3 libFoundationEssentials.so`LockedState.withLock<A>(_:) [inlined] closure #1 (state=<unavailable>, lock=0x555555570cc0, body=0x00007ffff722dee0 libFoundationEssentials.so`closure #1 @Sendable (inout Swift.Optional<FoundationEssentials._CalendarProtocol>) -> Swift.Optional<FoundationEssentials._CalendarProtocol> in FoundationEssentials.CalendarCache.current.getter : FoundationEssentials._CalendarProtocol at Calendar_Cache.swift:51) throws -> τ_1_0 in FoundationEssentials.LockedState.withLockUnchecked<τ_0_0>((inout τ_0_0) throws -> τ_1_0) throws -> τ_1_0 at LockedState.swift:117:24 [opt]
   114 	        try _buffer.withUnsafeMutablePointers { state, lock in
   115 	            _Lock.lock(lock)
   116 	            defer { _Lock.unlock(lock) }
-> 117 	            return try body(&state.pointee)
   118 	        }
   119 	    }
   120 	
Target 1: (date) stopped.
(lldb) s
Process 1592276 stopped
* thread #1, name = 'date', stop reason = step in
    frame #0: 0x00007ffff719adb6 libFoundationEssentials.so`LockedState.withLock<A>(_:) [inlined] $defer<τ_0_0><τ_1_0>(lock=<unavailable>) -> () at LockedState.swift:116:27 [opt]
   113 	    package func withLockUnchecked<T>(_ body: (inout State) throws -> T) rethrows -> T {
   114 	        try _buffer.withUnsafeMutablePointers { state, lock in
   115 	            _Lock.lock(lock)
-> 116 	            defer { _Lock.unlock(lock) }
   117 	            return try body(&state.pointee)
   118 	        }
   119 	    }
Target 1: (date) stopped.
(lldb) s
Expected<T> must be checked before access or destruction.
Unchecked Expected<T> contained error:
invalid typeLLDB diagnostics will be written to /tmp/diagnostics-c6f34b
Please include the directory content when filing a bug report
Aborted (core dumped)

$ cat /tmp/diagnostics-c6f34b/diagnostics.log 
libFoundationEssentials.so was compiled with optimization - stepping may behave oddly; variables may not be available.ld-linux-x86-64.so.2 0x00001c42: DW_TAG_member '__size' refers to type 0x0000000000001c5b which extends beyond the bounds of 0x00001c2d

(lldb) log enable lldb formatters 
(lldb) s
dbg.evt-handler  [platformLock 0x7fca14082970] checking for FormatManager revisions. ValueObject rev: 0 - Global rev: 316
dbg.evt-handler  

[format] Looking into cache for type FoundationEssentials.LockedState<τ_0_0>._Lock.PlatformLock
dbg.evt-handler  [format] Cache search failed. Going normal route
dbg.evt-handler  [Get] candidate match = FoundationEssentials.LockedState<τ_0_0>._Lock.PlatformLock no-strip-pointers no-strip-reference no-strip-typedef
dbg.evt-handler  [Get] candidate match = Swift.UnsafeMutablePointer<FoundationEssentials.LockedState<τ_0_0>._Lock.Primitive> no-strip-pointers no-strip-reference strip-typedef
dbg.evt-handler  [Get] candidate match = UnsafeMutablePointer<FoundationEssentials.LockedState<τ_0_0>._Lock.Primitive> no-strip-pointers no-strip-reference strip-typedef
dbg.evt-handler  [Get] Trying to use category default
dbg.evt-handler  [Get] Trying to use category VectorTypes
dbg.evt-handler  [Get] Trying to use category runtime-synthetics
dbg.evt-handler  [Get] Trying to use category system
dbg.evt-handler  [Get] nothing found - returning empty SP
dbg.evt-handler  [format] Caching (nil) for type FoundationEssentials.LockedState<τ_0_0>._Lock.PlatformLock
dbg.evt-handler  [format] Search failed. Giving language a chance.
dbg.evt-handler  [format] Language search success. Returning.
dbg.evt-handler  

[summary] Looking into cache for type FoundationEssentials.LockedState<τ_0_0>._Lock.PlatformLock
dbg.evt-handler  [summary] Cache search failed. Going normal route
dbg.evt-handler  [Get] candidate match = FoundationEssentials.LockedState<τ_0_0>._Lock.PlatformLock no-strip-pointers no-strip-reference no-strip-typedef
dbg.evt-handler  [Get] candidate match = Swift.UnsafeMutablePointer<FoundationEssentials.LockedState<τ_0_0>._Lock.Primitive> no-strip-pointers no-strip-reference strip-typedef
dbg.evt-handler  [Get] candidate match = UnsafeMutablePointer<FoundationEssentials.LockedState<τ_0_0>._Lock.Primitive> no-strip-pointers no-strip-reference strip-typedef
dbg.evt-handler  [Get] Trying to use category default
dbg.evt-handler  [Get] Trying to use category VectorTypes
dbg.evt-handler  [Get] Trying to use category runtime-synthetics
dbg.evt-handler  [Get] Trying to use category system
dbg.evt-handler  [Get] nothing found - returning empty SP
dbg.evt-handler  [summary] Caching (nil) for type FoundationEssentials.LockedState<τ_0_0>._Lock.PlatformLock
dbg.evt-handler  [summary] Search failed. Giving language a chance.
dbg.evt-handler  [summary] Language search success. Returning.
dbg.evt-handler  

[synthetic] Looking into cache for type FoundationEssentials.LockedState<τ_0_0>._Lock.PlatformLock
dbg.evt-handler  [synthetic] Cache search failed. Going normal route
dbg.evt-handler  [Get] candidate match = FoundationEssentials.LockedState<τ_0_0>._Lock.PlatformLock no-strip-pointers no-strip-reference no-strip-typedef
dbg.evt-handler  [Get] candidate match = Swift.UnsafeMutablePointer<FoundationEssentials.LockedState<τ_0_0>._Lock.Primitive> no-strip-pointers no-strip-reference strip-typedef
dbg.evt-handler  [Get] candidate match = UnsafeMutablePointer<FoundationEssentials.LockedState<τ_0_0>._Lock.Primitive> no-strip-pointers no-strip-reference strip-typedef
dbg.evt-handler  [Get] Trying to use category default
dbg.evt-handler  [Get] Trying to use category VectorTypes
dbg.evt-handler  [Get] Trying to use category runtime-synthetics
dbg.evt-handler  [Get] Trying to use category system
dbg.evt-handler  [Get] nothing found - returning empty SP
dbg.evt-handler  [synthetic] Caching (nil) for type FoundationEssentials.LockedState<τ_0_0>._Lock.PlatformLock
dbg.evt-handler  [synthetic] Search failed. Giving language a chance.
dbg.evt-handler  [synthetic] Language search success. Returning.
dbg.evt-handler  [platformLock 0x7fca14082970] checking for FormatManager revisions. ValueObject rev: 316 - Global rev: 316
dbg.evt-handler  [platformLock 0x7fca14082970] checking for FormatManager revisions. ValueObject rev: 316 - Global rev: 316
Expected<T> must be checked before access or destruction.
Unchecked Expected<T> contained error:
invalid typeLLDB diagnostics will be written to /tmp/diagnostics-a1e448
Please include the directory content when filing a bug report
Aborted (core dumped)

Originally observed on

Ubuntun 22.04 x86_64-linux-gnu

with:

lldb version 17.0.0 (https://github.com/apple/llvm-project.git revision 834570a)
Swift version 6.1-dev (LLVM 834570a, Swift ad0006307b78d0e)