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AHC crashes with HTTP2 when uploading a big body when channel & delegate live on separate EventLoops #784

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weissi opened this issue Nov 22, 2024 · 1 comment · May be fixed by #785
Open

AHC crashes with HTTP2 when uploading a big body when channel & delegate live on separate EventLoops #784

weissi opened this issue Nov 22, 2024 · 1 comment · May be fixed by #785

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@weissi
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weissi commented Nov 22, 2024

This is a pretty fun bug: In (at least) HTTP2 mode, when uploading a huge body, AHC behaves badly in various different ways.
The writes (in a recursive loop) are run in a recursive loop and they are freewheeling meaning there is no real backpressure.

Specifically in

async-http-client/Sources/AsyncHTTPClient/RequestBag.swift

Lines 187 to 188 in bdaa3b1

writer.writeRequestBodyPart(part, request: self, promise: promise)
return future
, we don't return the actual write promise but rather a pre-succeeded future. This won't stop until the state machine switches into a mode to "pause" sending the request body.

The problem is twofold:

  1. When delegate & channel are not co-located, the "pause" can arrive quite a bit too late because it's triggered from the channel's channelWritabilityChanged -> false which of course happens on the channel's EL. But the writes are triggered on the delegate's EL... (That's bad usually not fatal, we're just eating up some extra memory)
  2. Unfortunately, (in

    async-http-client/Sources/AsyncHTTPClient/HTTPHandler.swift

    Lines 58 to 69 in bdaa3b1

    func writeNextChunk(_ chunk: Bytes.SubSequence) -> EventLoopFuture<Void> {
    if let nextChunk = iterator.wrappedValue.next() {
    return self.write(.byteBuffer(ByteBuffer(bytes: chunk))).flatMap {
    writeNextChunk(nextChunk)
    }
    } else {
    return self.write(.byteBuffer(ByteBuffer(bytes: chunk)))
    }
    }
    return writeNextChunk(chunk)
    }
    ) we are actually triggering the writes recursively! That means it's actually impossible to get the pause signal until we're done. We'll just recurse on that pre-fulfilled future (which will immediately execute) and never enter the event loop again where a "please pause sending bytes" is waiting to execute. This is always fatal if we can't tolerate O(bodySize / 4MB) recursive stack frames. 5 GB always does the job.
@weissi
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weissi commented Nov 22, 2024

FWIW, the crash looks like so

(lldb) bt
* thread #7, name = 'NIO-ELT-0-#1', stop reason = EXC_BAD_ACCESS (code=2, address=0x1700bffd0)
    frame #0: 0x0000000197c32198 libswiftCore.dylib`std::__1::enable_if<is_hashable_data<char const>::value, __swift::__runtime::llvm::hash_code>::type __swift::__runtime::llvm::hashing::detail::hash_combine_range_impl<char const>(char const*, char const*) + 8
    frame #1: 0x0000000197c320ec libswiftCore.dylib`__swift::__runtime::llvm::hash_code __swift::__runtime::llvm::hash_combine<__swift::__runtime::llvm::hash_code, __swift::__runtime::llvm::StringRef>(__swift::__runtime::llvm::hash_code const&, __swift::__runtime::llvm::StringRef const&) + 104
    frame #2: 0x0000000197c31f24 libswiftCore.dylib`std::__1::pair<swift::HashMapElementWrapper<(anonymous namespace)::TupleCacheEntry>*, unsigned int> swift::ConcurrentReadableHashMap<swift::HashMapElementWrapper<(anonymous namespace)::TupleCacheEntry>, swift::Mutex>::find<(anonymous namespace)::TupleCacheEntry::Key>((anonymous namespace)::TupleCacheEntry::Key const&, swift::ConcurrentReadableHashMap<swift::HashMapElementWrapper<(anonymous namespace)::TupleCacheEntry>, swift::Mutex>::IndexStorage, unsigned long, swift::HashMapElementWrapper<(anonymous namespace)::TupleCacheEntry>*) + 116
    frame #3: 0x0000000197c189b0 libswiftCore.dylib`std::__1::pair<(anonymous namespace)::TupleCacheEntry*, swift::MetadataResponse> swift::LockingConcurrentMap<(anonymous namespace)::TupleCacheEntry, (anonymous namespace)::TupleCacheStorage>::getOrInsert<(anonymous namespace)::TupleCacheEntry::Key, swift::MetadataRequest&, swift::TargetValueWitnessTable<swift::InProcess> const*&>((anonymous namespace)::TupleCacheEntry::Key, swift::MetadataRequest&, swift::TargetValueWitnessTable<swift::InProcess> const*&) + 276
    frame #4: 0x0000000197c1869c libswiftCore.dylib`swift_getTupleTypeMetadata + 108
    frame #5: 0x0000000197c19888 libswiftCore.dylib`swift_getTupleTypeMetadata2 + 32
  * frame #6: 0x00000001078c475c AsyncHTTPClientTests`RequestBag.StateMachine.writeNextRequestPart(part=byteBuffer, taskEventLoop=0x0000600002a44000) at RequestBag+StateMachine.swift:200:97
    frame #7: 0x00000001078f2fe0 AsyncHTTPClientTests`RequestBag.writeNextRequestPart0(part=byteBuffer) at RequestBag.swift:171:33
    frame #8: 0x00000001078f26f4 AsyncHTTPClientTests`RequestBag.writeNextRequestPart(part=byteBuffer) at RequestBag.swift:160:25
    frame #9: 0x00000001078f25e8 AsyncHTTPClientTests`closure #1 in RequestBag.resumeRequestBodyStream0($0=byteBuffer) at RequestBag.swift:137:22
    frame #10: 0x000000010789650c AsyncHTTPClientTests`HTTPClient.Body.StreamWriter.write(data=byteBuffer) at HTTPHandler.swift:46:22
    frame #11: 0x0000000107897328 AsyncHTTPClientTests`writeNextChunk #1 <Foundation.Data>@Sendable (chunk=(offset = 228, element = <no summary available>), allDone=NIOCore.EventLoopPromise<Swift.Void> @ 0x00000001700c1428, iterator=NIOConcurrencyHelpers.NIOLockedValueBox<Swift.EnumeratedSequence<Algorithms.ChunksOfCountCollection<Foundation.Data>>.Iterator> @ 0x00000001700c1420) in HTTPClient.Body.StreamWriter.writeChunks<Foundation.Data>(of:maxChunkSize:) at HTTPHandler.swift:73:30
    frame #12: 0x0000000107897b4c AsyncHTTPClientTests`closure #2 in writeNextChunk #1 <Foundation.Data>@Sendable (index=228, allDone=NIOCore.EventLoopPromise<Swift.Void> @ 0x00000001700c1588, iterator=NIOConcurrencyHelpers.NIOLockedValueBox<Swift.EnumeratedSequence<Algorithms.ChunksOfCountCollection<Foundation.Data>>.Iterator> @ 0x00000001700c1580, nextElement=(offset = 228, element = <no summary available>)) in HTTPClient.Body.StreamWriter.writeChunks<Foundation.Data>(of:maxChunkSize:) at HTTPHandler.swift:84:33
    frame #13: 0x0000000107897d00 AsyncHTTPClientTests`thunk for @escaping @callee_guaranteed @Sendable () -> () at <compiler-generated>:0
    frame #14: 0x0000000106f8ab64 AsyncHTTPClientTests`thunk for @escaping @callee_guaranteed @Sendable (@in_guaranteed A) -> (@out ()) at <compiler-generated>:0
    frame #15: 0x0000000106f8cba0 AsyncHTTPClientTests`closure #1 in EventLoopFuture.whenSuccess(, callback=0x106f97fd8) at EventLoopFuture.swift:821:17
    frame #16: 0x0000000106f896b4 AsyncHTTPClientTests`EventLoopFuture._addCallback(callback=0x0000000106f98040 AsyncHTTPClientTests`partial apply forwarder for closure #1 @Sendable () -> NIOCore.CallbackList in NIOCore.EventLoopFuture.whenSuccess((A) -> ()) -> () at <compiler-generated>) at EventLoopFuture.swift:783:16
    frame #17: 0x0000000106f8c7bc AsyncHTTPClientTests`EventLoopFuture._internalWhenComplete(callback=0x0000000106f98040 AsyncHTTPClientTests`partial apply forwarder for closure #1 @Sendable () -> NIOCore.CallbackList in NIOCore.EventLoopFuture.whenSuccess((A) -> ()) -> () at <compiler-generated>) at EventLoopFuture.swift:798:18
    frame #18: 0x0000000106f8975c AsyncHTTPClientTests`EventLoopFuture._whenComplete(callback=0x0000000106f98040 AsyncHTTPClientTests`partial apply forwarder for closure #1 @Sendable () -> NIOCore.CallbackList in NIOCore.EventLoopFuture.whenSuccess((A) -> ()) -> () at <compiler-generated>) at EventLoopFuture.swift:791:14
    frame #19: 0x0000000106f8ac18 AsyncHTTPClientTests`EventLoopFuture.whenSuccess(callback=0x106f97fd8) at EventLoopFuture.swift:819:14
    frame #20: 0x0000000106f8aa10 AsyncHTTPClientTests`EventLoopFuture._map<()>(callback=0x1078af344) at EventLoopFuture.swift:653:18
    frame #21: 0x0000000106f8a854 AsyncHTTPClientTests`EventLoopFuture.map<()>(callback=0x1078af344) at EventLoopFuture.swift:644:14
    frame #22: 0x00000001078974e8 AsyncHTTPClientTests`writeNextChunk #1 <Foundation.Data>@Sendable (chunk=(offset = 227, element = <no summary available>), allDone=NIOCore.EventLoopPromise<Swift.Void> @ 0x00000001700c1d28, iterator=NIOConcurrencyHelpers.NIOLockedValueBox<Swift.EnumeratedSequence<Algorithms.ChunksOfCountCollection<Foundation.Data>>.Iterator> @ 0x00000001700c1d20) in HTTPClient.Body.StreamWriter.writeChunks<Foundation.Data>(of:maxChunkSize:) at HTTPHandler.swift:73:75
    frame #23: 0x0000000107897b4c AsyncHTTPClientTests`closure #2 in writeNextChunk #1 <Foundation.Data>@Sendable (index=227, allDone=NIOCore.EventLoopPromise<Swift.Void> @ 0x00000001700c1e88, iterator=NIOConcurrencyHelpers.NIOLockedValueBox<Swift.EnumeratedSequence<Algorithms.ChunksOfCountCollection<Foundation.Data>>.Iterator> @ 0x00000001700c1e80, nextElement=(offset = 227, element = <no summary available>)) in HTTPClient.Body.StreamWriter.writeChunks<Foundation.Data>(of:maxChunkSize:) at HTTPHandler.swift:84:33
    frame #24: 0x0000000107897d00 AsyncHTTPClientTests`thunk for @escaping @callee_guaranteed @Sendable () -> () at <compiler-generated>:0
    frame #25: 0x0000000106f8ab64 AsyncHTTPClientTests`thunk for @escaping @callee_guaranteed @Sendable (@in_guaranteed A) -> (@out ()) at <compiler-generated>:0
    frame #26: 0x0000000106f8cba0 AsyncHTTPClientTests`closure #1 in EventLoopFuture.whenSuccess(, callback=0x106f97fd8) at EventLoopFuture.swift:821:17
    frame #27: 0x0000000106f896b4 AsyncHTTPClientTests`EventLoopFuture._addCallback(callback=0x0000000106f98040 AsyncHTTPClientTests`partial apply forwarder for closure #1 @Sendable () -> NIOCore.CallbackList in NIOCore.EventLoopFuture.whenSuccess((A) -> ()) -> () at <compiler-generated>) at EventLoopFuture.swift:783:16
    frame #28: 0x0000000106f8c7bc AsyncHTTPClientTests`EventLoopFuture._internalWhenComplete(callback=0x0000000106f98040 AsyncHTTPClientTests`partial apply forwarder for closure #1 @Sendable () -> NIOCore.CallbackList in NIOCore.EventLoopFuture.whenSuccess((A) -> ()) -> () at <compiler-generated>) at EventLoopFuture.swift:798:18
    frame #29: 0x0000000106f8975c AsyncHTTPClientTests`EventLoopFuture._whenComplete(callback=0x0000000106f98040 AsyncHTTPClientTests`partial apply forwarder for closure #1 @Sendable () -> NIOCore.CallbackList in NIOCore.EventLoopFuture.whenSuccess((A) -> ()) -> () at <compiler-generated>) at EventLoopFuture.swift:791:14
    frame #30: 0x0000000106f8ac18 AsyncHTTPClientTests`EventLoopFuture.whenSuccess(callback=0x106f97fd8) at EventLoopFuture.swift:819:14
    frame #31: 0x0000000106f8aa10 AsyncHTTPClientTests`EventLoopFuture._map<()>(callback=0x1078af344) at EventLoopFuture.swift:653:18
    frame #32: 0x0000000106f8a854 AsyncHTTPClientTests`EventLoopFuture.map<()>(callback=0x1078af344) at EventLoopFuture.swift:644:14
    frame #33: 0x00000001078974e8 AsyncHTTPClientTests`writeNextChunk #1 <Foundation.Data>@Sendable (chunk=(offset = 226, element = <no summary available>), allDone=NIOCore.EventLoopPromise<Swift.Void> @ 0x00000001700c2628, iterator=NIOConcurrencyHelpers.NIOLockedValueBox<Swift.EnumeratedSequence<Algorithms.ChunksOfCountCollection<Foundation.Data>>.Iterator> @ 0x00000001700c2620) in HTTPClient.Body.StreamWriter.writeChunks<Foundation.Data>(of:maxChunkSize:) at HTTPHandler.swift:73:75
    frame #34: 0x0000000107897b4c AsyncHTTPClientTests`closure #2 in writeNextChunk #1 <Foundation.Data>@Sendable (index=226, allDone=NIOCore.EventLoopPromise<Swift.Void> @ 0x00000001700c2788, iterator=NIOConcurrencyHelpers.NIOLockedValueBox<Swift.EnumeratedSequence<Algorithms.ChunksOfCountCollection<Foundation.Data>>.Iterator> @ 0x00000001700c2780, nextElement=(offset = 226, element = <no summary available>)) in HTTPClient.Body.StreamWriter.writeChunks<Foundation.Data>(of:maxChunkSize:) at HTTPHandler.swift:84:33
    frame #35: 0x0000000107897d00 AsyncHTTPClientTests`thunk for @escaping @callee_guaranteed @Sendable () -> () at <compiler-generated>:0
    frame #36: 0x0000000106f8ab64 AsyncHTTPClientTests`thunk for @escaping @callee_guaranteed @Sendable (@in_guaranteed A) -> (@out ()) at <compiler-generated>:0
    frame #37: 0x0000000106f8cba0 AsyncHTTPClientTests`closure #1 in EventLoopFuture.whenSuccess(, callback=0x106f97fd8) at EventLoopFuture.swift:821:17
    frame #38: 0x0000000106f896b4 AsyncHTTPClientTests`EventLoopFuture._addCallback(callback=0x0000000106f98040 AsyncHTTPClientTests`partial apply forwarder for closure #1 @Sendable () -> NIOCore.CallbackList in NIOCore.EventLoopFuture.whenSuccess((A) -> ()) -> () at <compiler-generated>) at EventLoopFuture.swift:783:16
    frame #39: 0x0000000106f8c7bc AsyncHTTPClientTests`EventLoopFuture._internalWhenComplete(callback=0x0000000106f98040 AsyncHTTPClientTests`partial apply forwarder for closure #1 @Sendable () -> NIOCore.CallbackList in NIOCore.EventLoopFuture.whenSuccess((A) -> ()) -> () at <compiler-generated>) at EventLoopFuture.swift:798:18
    frame #40: 0x0000000106f8975c AsyncHTTPClientTests`EventLoopFuture._whenComplete(callback=0x0000000106f98040 AsyncHTTPClientTests`partial apply forwarder for closure #1 @Sendable () -> NIOCore.CallbackList in NIOCore.EventLoopFuture.whenSuccess((A) -> ()) -> () at <compiler-generated>) at EventLoopFuture.swift:791:14
    frame #41: 0x0000000106f8ac18 AsyncHTTPClientTests`EventLoopFuture.whenSuccess(callback=0x106f97fd8) at EventLoopFuture.swift:819:14
    frame #42: 0x0000000106f8aa10 AsyncHTTPClientTests`EventLoopFuture._map<()>(callback=0x1078af344) at EventLoopFuture.swift:653:18
    frame #43: 0x0000000106f8a854 AsyncHTTPClientTests`EventLoopFuture.map<()>(callback=0x1078af344) at EventLoopFuture.swift:644:14
    frame #44: 0x00000001078974e8 AsyncHTTPClientTests`writeNextChunk #1 <Foundation.Data>@Sendable (chunk=(offset = 225, element = <no summary available>), allDone=NIOCore.EventLoopPromise<Swift.Void> @ 0x00000001700c2f28, iterator=NIOConcurrencyHelpers.NIOLockedValueBox<Swift.EnumeratedSequence<Algorithms.ChunksOfCountCollection<Foundation.Data>>.Iterator> @ 0x00000001700c2f20) in HTTPClient.Body.StreamWriter.writeChunks<Foundation.Data>(of:maxChunkSize:) at HTTPHandler.swift:73:75
    frame #45: 0x0000000107897b4c AsyncHTTPClientTests`closure #2 in writeNextChunk #1 <Foundation.Data>@Sendable (index=225, allDone=NIOCore.EventLoopPromise<Swift.Void> @ 0x00000001700c3088, iterator=NIOConcurrencyHelpers.NIOLockedValueBox<Swift.EnumeratedSequence<Algorithms.ChunksOfCountCollection<Foundation.Data>>.Iterator> @ 0x00000001700c3080, nextElement=(offset = 225, element = <no summary available>)) in HTTPClient.Body.StreamWriter.writeChunks<Foundation.Data>(of:maxChunkSize:) at HTTPHandler.swift:84:33
    frame #46: 0x0000000107897d00 AsyncHTTPClientTests`thunk for @escaping @callee_guaranteed @Sendable () -> () at <compiler-generated>:0
    frame #47: 0x0000000106f8ab64 AsyncHTTPClientTests`thunk for @escaping @callee_guaranteed @Sendable (@in_guaranteed A) -> (@out ()) at <compiler-generated>:0
    frame #48: 0x0000000106f8cba0 AsyncHTTPClientTests`closure #1 in EventLoopFuture.whenSuccess(, callback=0x106f97fd8) at EventLoopFuture.swift:821:17
    frame #49: 0x0000000106f896b4 AsyncHTTPClientTests`EventLoopFuture._addCallback(callback=0x0000000106f98040 AsyncHTTPClientTests`partial apply forwarder for closure #1 @Sendable () -> NIOCore.CallbackList in NIOCore.EventLoopFuture.whenSuccess((A) -> ()) -> () at <compiler-generated>) at EventLoopFuture.swift:783:16
    frame #50: 0x0000000106f8c7bc AsyncHTTPClientTests`EventLoopFuture._internalWhenComplete(callback=0x0000000106f98040 AsyncHTTPClientTests`partial apply forwarder for closure #1 @Sendable () -> NIOCore.CallbackList in NIOCore.EventLoopFuture.whenSuccess((A) -> ()) -> () at <compiler-generated>) at EventLoopFuture.swift:798:18
    frame #51: 0x0000000106f8975c AsyncHTTPClientTests`EventLoopFuture._whenComplete(callback=0x0000000106f98040 AsyncHTTPClientTests`partial apply forwarder for closure #1 @Sendable () -> NIOCore.CallbackList in NIOCore.EventLoopFuture.whenSuccess((A) -> ()) -> () at <compiler-generated>) at EventLoopFuture.swift:791:14
    frame #52: 0x0000000106f8ac18 AsyncHTTPClientTests`EventLoopFuture.whenSuccess(callback=0x106f97fd8) at EventLoopFuture.swift:819:14
    frame #53: 0x0000000106f8aa10 AsyncHTTPClientTests`EventLoopFuture._map<()>(callback=0x1078af344) at EventLoopFuture.swift:653:18
    frame #54: 0x0000000106f8a854 AsyncHTTPClientTests`EventLoopFuture.map<()>(callback=0x1078af344) at EventLoopFuture.swift:644:14
    frame #55: 0x00000001078974e8 AsyncHTTPClientTests`writeNextChunk #1 <Foundation.Data>@Sendable (chunk=(offset = 224, element = <no summary available>), allDone=NIOCore.EventLoopPromise<Swift.Void> @ 0x00000001700c3828, iterator=NIOConcurrencyHelpers.NIOLockedValueBox<Swift.EnumeratedSequence<Algorithms.ChunksOfCountCollection<Foundation.Data>>.Iterator> @ 0x00000001700c3820) in HTTPClient.Body.StreamWriter.writeChunks<Foundation.Data>(of:maxChunkSize:) at HTTPHandler.swift:73:75
    frame #56: 0x0000000107897b4c AsyncHTTPClientTests`closure #2 in writeNextChunk #1 <Foundation.Data>@Sendable (index=224, allDone=NIOCore.EventLoopPromise<Swift.Void> @ 0x00000001700c3988, iterator=NIOConcurrencyHelpers.NIOLockedValueBox<Swift.EnumeratedSequence<Algorithms.ChunksOfCountCollection<Foundation.Data>>.Iterator> @ 0x00000001700c3980, nextElement=(offset = 224, element = <no summary available>)) in HTTPClient.Body.StreamWriter.writeChunks<Foundation.Data>(of:maxChunkSize:) at HTTPHandler.swift:84:33
    frame #57: 0x0000000107897d00 AsyncHTTPClientTests`thunk for @escaping @callee_guaranteed @Sendable () -> () at <compiler-generated>:0
    frame #58: 0x0000000106f8ab64 AsyncHTTPClientTests`thunk for @escaping @callee_guaranteed @Sendable (@in_guaranteed A) -> (@out ()) at <compiler-generated>:0
    frame #59: 0x0000000106f8cba0 AsyncHTTPClientTests`closure #1 in EventLoopFuture.whenSuccess(, callback=0x106f97fd8) at EventLoopFuture.swift:821:17
    frame #60: 0x0000000106f896b4 AsyncHTTPClientTests`EventLoopFuture._addCallback(callback=0x0000000106f98040 AsyncHTTPClientTests`partial apply forwarder for closure #1 @Sendable () -> NIOCore.CallbackList in NIOCore.EventLoopFuture.whenSuccess((A) -> ()) -> () at <compiler-generated>) at EventLoopFuture.swift:783:16
    frame #61: 0x0000000106f8c7bc AsyncHTTPClientTests`EventLoopFuture._internalWhenComplete(callback=0x0000000106f98040 AsyncHTTPClientTests`partial apply forwarder for closure #1 @Sendable () -> NIOCore.CallbackList in NIOCore.EventLoopFuture.whenSuccess((A) -> ()) -> () at <compiler-generated>) at EventLoopFuture.swift:798:18
    frame #62: 0x0000000106f8975c AsyncHTTPClientTests`EventLoopFuture._whenComplete(callback=0x0000000106f98040 AsyncHTTPClientTests`partial apply forwarder for closure #1 @Sendable () -> NIOCore.CallbackList in NIOCore.EventLoopFuture.whenSuccess((A) -> ()) -> () at <compiler-generated>) at EventLoopFuture.swift:791:14
    frame #63: 0x0000000106f8ac18 AsyncHTTPClientTests`EventLoopFuture.whenSuccess(callback=0x106f97fd8) at EventLoopFuture.swift:819:14
    frame #64: 0x0000000106f8aa10 AsyncHTTPClientTests`EventLoopFuture._map<()>(callback=0x1078af344) at EventLoopFuture.swift:653:18
    frame #65: 0x0000000106f8a854 AsyncHTTPClientTests`EventLoopFuture.map<()>(callback=0x1078af344) at EventLoopFuture.swift:644:14
    frame #66: 0x00000001078974e8 AsyncHTTPClientTests`writeNextChunk #1 <Foundation.Data>@Sendable (chunk=(offset = 223, element = <no summary available>), allDone=NIOCore.EventLoopPromise<Swift.Void> @ 0x00000001700c4128, iterator=NIOConcurrencyHelpers.NIOLockedValueBox<Swift.EnumeratedSequence<Algorithms.ChunksOfCountCollection<Foundation.Data>>.Iterator> @ 0x00000001700c4120) in HTTPClient.Body.StreamWriter.writeChunks<Foundation.Data>(of:maxChunkSize:) at HTTPHandler.swift:73:75
    frame #67: 0x0000000107897b4c AsyncHTTPClientTests`closure #2 in writeNextChunk #1 <Foundation.Data>@Sendable (index=223, allDone=NIOCore.EventLoopPromise<Swift.Void> @ 0x00000001700c4288, iterator=NIOConcurrencyHelpers.NIOLockedValueBox<Swift.EnumeratedSequence<Algorithms.ChunksOfCountCollection<Foundation.Data>>.Iterator> @ 0x00000001700c4280, nextElement=(offset = 223, element = <no summary available>)) in HTTPClient.Body.StreamWriter.writeChunks<Foundation.Data>(of:maxChunkSize:) at HTTPHandler.swift:84:33
    frame #68: 0x0000000107897d00 AsyncHTTPClientTests`thunk for @escaping @callee_guaranteed @Sendable () -> () at <compiler-generated>:0
    frame #69: 0x0000000106f8ab64 AsyncHTTPClientTests`thunk for @escaping @callee_guaranteed @Sendable (@in_guaranteed A) -> (@out ()) at <compiler-generated>:0
    frame #70: 0x0000000106f8cba0 AsyncHTTPClientTests`closure #1 in EventLoopFuture.whenSuccess(, callback=0x106f97fd8) at EventLoopFuture.swift:821:17
    frame #71: 0x0000000106f896b4 AsyncHTTPClientTests`EventLoopFuture._addCallback(callback=0x0000000106f98040 AsyncHTTPClientTests`partial apply forwarder for closure #1 @Sendable () -> NIOCore.CallbackList in NIOCore.EventLoopFuture.whenSuccess((A) -> ()) -> () at <compiler-generated>) at EventLoopFuture.swift:783:16
    frame #72: 0x0000000106f8c7bc AsyncHTTPClientTests`EventLoopFuture._internalWhenComplete(callback=0x0000000106f98040 AsyncHTTPClientTests`partial apply forwarder for closure #1 @Sendable () -> NIOCore.CallbackList in NIOCore.EventLoopFuture.whenSuccess((A) -> ()) -> () at <compiler-generated>) at EventLoopFuture.swift:798:18
    frame #73: 0x0000000106f8975c AsyncHTTPClientTests`EventLoopFuture._whenComplete(callback=0x0000000106f98040 AsyncHTTPClientTests`partial apply forwarder for closure #1 @Sendable () -> NIOCore.CallbackList in NIOCore.EventLoopFuture.whenSuccess((A) -> ()) -> () at <compiler-generated>) at EventLoopFuture.swift:791:14
    frame #74: 0x0000000106f8ac18 AsyncHTTPClientTests`EventLoopFuture.whenSuccess(callback=0x106f97fd8) at EventLoopFuture.swift:819:14    frame #75: 0x0000000106f8aa10 AsyncHTTPClientTests`EventLoopFuture._map<()>(callback=0x1078af344) at EventLoopFuture.swift:653:18
    frame #76: 0x0000000106f8a854 AsyncHTTPClientTests`EventLoopFuture.map<()>(callback=0x1078af344) at EventLoopFuture.swift:644:14
    frame #77: 0x00000001078974e8 AsyncHTTPClientTests`writeNextChunk #1 <Foundation.Data>@Sendable (chunk=(offset = 222, element = <no summary available>), allDone=NIOCore.EventLoopPromise<Swift.Void> @ 0x00000001700c4a28, iterator=NIOConcurrencyHelpers.NIOLockedValueBox<Swift.EnumeratedSequence<Algorithms.ChunksOfCountCollection<Foundation.Data>>.Iterator> @ 0x00000001700c4a20) in HTTPClient.Body.StreamWriter.writeChunks<Foundation.Data>(of:maxChunkSize:) at HTTPHandler.swift:73:75
    frame #78: 0x0000000107897b4c AsyncHTTPClientTests`closure #2 in writeNextChunk #1 <Foundation.Data>@Sendable (index=222, allDone=NIOCore.EventLoopPromise<Swift.Void> @ 0x00000001700c4b88, iterator=NIOConcurrencyHelpers.NIOLockedValueBox<Swift.EnumeratedSequence<Algorithms.ChunksOfCountCollection<Foundation.Data>>.Iterator> @ 0x00000001700c4b80, nextElement=(offset = 222, element = <no summary available>)) in HTTPClient.Body.StreamWriter.writeChunks<Foundation.Data>(of:maxChunkSize:) at HTTPHandler.swift:84:33
    frame #79: 0x0000000107897d00 AsyncHTTPClientTests`thunk for @escaping @callee_guaranteed @Sendable () -> () at <compiler-generated>:0
    frame #80: 0x0000000106f8ab64 AsyncHTTPClientTests`thunk for @escaping @callee_guaranteed @Sendable (@in_guaranteed A) -> (@out ()) at <compiler-generated>:0
    frame #81: 0x0000000106f8cba0 AsyncHTTPClientTests`closure #1 in EventLoopFuture.whenSuccess(, callback=0x106f97fd8) at EventLoopFuture.swift:821:17
    frame #82: 0x0000000106f896b4 AsyncHTTPClientTests`EventLoopFuture._addCallback(callback=0x0000000106f98040 AsyncHTTPClientTests`partial apply forwarder for closure #1 @Sendable () -> NIOCore.CallbackList in NIOCore.EventLoopFuture.whenSuccess((A) -> ()) -> () at <compiler-generated>) at EventLoopFuture.swift:783:16
    frame #83: 0x0000000106f8c7bc AsyncHTTPClientTests`EventLoopFuture._internalWhenComplete(callback=0x0000000106f98040 AsyncHTTPClientTests`partial apply forwarder for closure #1 @Sendable () -> NIOCore.CallbackList in NIOCore.EventLoopFuture.whenSuccess((A) -> ()) -> () at <compiler-generated>) at EventLoopFuture.swift:798:18
    frame #84: 0x0000000106f8975c AsyncHTTPClientTests`EventLoopFuture._whenComplete(callback=0x0000000106f98040 AsyncHTTPClientTests`partial apply forwarder for closure #1 @Sendable () -> NIOCore.CallbackList in NIOCore.EventLoopFuture.whenSuccess((A) -> ()) -> () at <compiler-generated>) at EventLoopFuture.swift:791:14
    frame #85: 0x0000000106f8ac18 AsyncHTTPClientTests`EventLoopFuture.whenSuccess(callback=0x106f97fd8) at EventLoopFuture.swift:819:14
    frame #86: 0x0000000106f8aa10 AsyncHTTPClientTests`EventLoopFuture._map<()>(callback=0x1078af344) at EventLoopFuture.swift:653:18
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[...]
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    frame #2518: 0x0000000106f8a854 AsyncHTTPClientTests`EventLoopFuture.map<()>(callback=0x1078af344) at EventLoopFuture.swift:644:14
    frame #2519: 0x00000001078974e8 AsyncHTTPClientTests`writeNextChunk #1 <Foundation.Data>@Sendable (chunk=(offset = 0, element = <no summary available>), allDone=NIOCore.EventLoopPromise<Swift.Void> @ 0x0000000170141828, iterator=NIOConcurrencyHelpers.NIOLockedValueBox<Swift.EnumeratedSequence<Algorithms.ChunksOfCountCollection<Foundation.Data>>.Iterator> @ 0x0000000170141820) in HTTPClient.Body.StreamWriter.writeChunks<Foundation.Data>(of:maxChunkSize:) at HTTPHandler.swift:73:75
    frame #2520: 0x0000000107897ed8 AsyncHTTPClientTests`closure #2 in HTTPClient.Body.StreamWriter.writeChunks<Foundation.Data>(_0=$sytD @ scalar, loop=0x0000600002a44000, iterator=NIOConcurrencyHelpers.NIOLockedValueBox<Swift.EnumeratedSequence<Algorithms.ChunksOfCountCollection<Foundation.Data>>.Iterator> @ 0x0000000170141940, chunk=(offset = 0, element = <no summary available>)) at HTTPHandler.swift:95:21
    frame #2521: 0x00000001078980e8 AsyncHTTPClientTests`partial apply for closure #2 in HTTPClient.Body.StreamWriter.writeChunks<A>(of:maxChunkSize:) at <compiler-generated>:0
    frame #2522: 0x0000000106f821f8 AsyncHTTPClientTests`closure #1 in EventLoopFuture.flatMapWithEventLoop<()>(, callback=0x107898038, eventLoop=0x0000600002a44000, next=NIOCore.EventLoopPromise<()> @ 0x0000000170141b78) at EventLoopFuture+WithEventLoop.swift:51:31
    frame #2523: 0x0000000106f896b4 AsyncHTTPClientTests`EventLoopFuture._addCallback(callback=0x0000000106f8257c AsyncHTTPClientTests`partial apply forwarder for closure #1 @Sendable () -> NIOCore.CallbackList in NIOCore.EventLoopFuture.flatMapWithEventLoop<A>((A, NIOCore.EventLoop) -> NIOCore.EventLoopFuture<A1>) -> NIOCore.EventLoopFuture<A1> at <compiler-generated>) at EventLoopFuture.swift:783:16
    frame #2524: 0x0000000106f8c7bc AsyncHTTPClientTests`EventLoopFuture._internalWhenComplete(callback=0x0000000106f8257c AsyncHTTPClientTests`partial apply forwarder for closure #1 @Sendable () -> NIOCore.CallbackList in NIOCore.EventLoopFuture.flatMapWithEventLoop<A>((A, NIOCore.EventLoop) -> NIOCore.EventLoopFuture<A1>) -> NIOCore.EventLoopFuture<A1> at <compiler-generated>) at EventLoopFuture.swift:798:18
    frame #2525: 0x0000000106f8975c AsyncHTTPClientTests`EventLoopFuture._whenComplete(callback=0x0000000106f8257c AsyncHTTPClientTests`partial apply forwarder for closure #1 @Sendable () -> NIOCore.CallbackList in NIOCore.EventLoopFuture.flatMapWithEventLoop<A>((A, NIOCore.EventLoop) -> NIOCore.EventLoopFuture<A1>) -> NIOCore.EventLoopFuture<A1> at <compiler-generated>) at EventLoopFuture.swift:791:14
    frame #2526: 0x0000000106f81e98 AsyncHTTPClientTests`EventLoopFuture.flatMapWithEventLoop<()>(callback=0x107898038) at EventLoopFuture+WithEventLoop.swift:48:14
    frame #2527: 0x0000000107896b0c AsyncHTTPClientTests`HTTPClient.Body.StreamWriter.writeChunks<Foundation.Data>(bytes=1073741824 bytes, maxChunkSize=4194304) at HTTPHandler.swift:93:62
    frame #2528: 0x000000010789921c AsyncHTTPClientTests`closure #1 in static HTTPClient.Body.bytes<Foundation.Data>(writer=(closure = 0x00000001078f25f8 AsyncHTTPClientTests`partial apply forwarder for closure #1 (NIOCore.IOData) -> NIOCore.EventLoopFuture<()> in AsyncHTTPClient.RequestBag.resumeRequestBodyStream0() -> () at <compiler-generated>), bytes=1073741824 bytes) at HTTPHandler.swift:178:35
    frame #2529: 0x00000001078f2378 AsyncHTTPClientTests`RequestBag.resumeRequestBodyStream0() at RequestBag.swift:140:18
    frame #2530: 0x00000001078f8b20 AsyncHTTPClientTests`closure #1 in RequestBag.resumeRequestBodyStream() at RequestBag.swift:471:22
    frame #2531: 0x00000001070bfc98 AsyncHTTPClientTests`closure #1 in SelectableEventLoop.run(task=(function = 0x00000001078f8b30 AsyncHTTPClientTests`partial apply forwarder for closure #1 @Sendable () -> () in AsyncHTTPClient.RequestBag.resumeRequestBodyStream() -> () at <compiler-generated>)) at SelectableEventLoop.swift:489:17
    frame #2532: 0x00000001070c638c AsyncHTTPClientTests`partial apply for closure #1 in SelectableEventLoop.run(_:) at <compiler-generated>:0
    frame #2533: 0x00000001070ba438 AsyncHTTPClientTests`closure #1 in withAutoReleasePool<()>(execute=0x1070c6370) at SelectableEventLoop.swift:27:13
    frame #2534: 0x00000001070ba4b4 AsyncHTTPClientTests`partial apply for closure #1 in withAutoReleasePool<A>(_:) at <compiler-generated>:0
    frame #2535: 0x00000001a03c84b8 libswiftObjectiveC.dylib`ObjectiveC.autoreleasepool<τ_0_0>(invoking: () throws -> τ_0_0) throws -> τ_0_0 + 64
    frame #2536: 0x00000001070ba3a4 AsyncHTTPClientTests`withAutoReleasePool<()>(execute=0x1070c6370) at SelectableEventLoop.swift:26:16
    frame #2537: 0x00000001070bfb7c AsyncHTTPClientTests`SelectableEventLoop.run(task=(function = 0x00000001078f8b30 AsyncHTTPClientTests`partial apply forwarder for closure #1 @Sendable () -> () in AsyncHTTPClient.RequestBag.resumeRequestBodyStream() -> () at <compiler-generated>)) at SelectableEventLoop.swift:486:9
    frame #2538: 0x00000001070c1204 AsyncHTTPClientTests`SelectableEventLoop.runLoop(selfIdentifier=ObjectIdentifier(0x0000600002a44000 -> 0x0000000107b482d0 type metadata for NIOPosix.SelectableEventLoop)) at SelectableEventLoop.swift:663:22
    frame #2539: 0x00000001070c1824 AsyncHTTPClientTests`SelectableEventLoop.run() at SelectableEventLoop.swift:759:33
    frame #2540: 0x0000000107060760 AsyncHTTPClientTests`static MultiThreadedEventLoopGroup.runTheLoop(thread=0x000060000115c270, parentGroup=0x0000600003c59e00, canEventLoopBeShutdownIndividually=false, selectorFactory=0x0000000107060f7c AsyncHTTPClientTests`implicit closure #1 () throws -> NIOPosix.Selector<NIOPosix.NIORegistration> in NIOPosix.MultiThreadedEventLoopGroup.init(numberOfThreads: Swift.Int) -> NIOPosix.MultiThreadedEventLoopGroup at MultiThreadedEventLoopGroup.swift, initializer=0x0000000107069314 AsyncHTTPClientTests`partial apply forwarder for reabstraction thunk helper from @escaping @callee_guaranteed (@in_guaranteed NIOPosix.NIOThread) -> (@out ()) to @escaping @callee_guaranteed (@guaranteed NIOPosix.NIOThread) -> () at <compiler-generated>, metricsDelegate=nil, callback=0x0000000107069364 AsyncHTTPClientTests`partial apply forwarder for closure #1 (NIOPosix.SelectableEventLoop) -> () in closure #1 (NIOPosix.NIOThread) -> () in static NIOPosix.MultiThreadedEventLoopGroup.setupThreadAndEventLoop(name: Swift.String, parentGroup: NIOPosix.MultiThreadedEventLoopGroup, selectorFactory: () throws -> NIOPosix.Selector<NIOPosix.NIORegistration>, initializer: (NIOPosix.NIOThread) -> (), metricsDelegate: Swift.Optional<NIOPosix.NIOEventLoopMetricsDelegate>) -> NIOPosix.SelectableEventLoop at <compiler-generated>) at MultiThreadedEventLoopGroup.swift:102:22
    frame #2541: 0x0000000107060ddc AsyncHTTPClientTests`closure #1 in static MultiThreadedEventLoopGroup.setupThreadAndEventLoop(t=0x000060000115c270, parentGroup=0x0000600003c59e00, selectorFactory=0x0000000107060f7c AsyncHTTPClientTests`implicit closure #1 () throws -> NIOPosix.Selector<NIOPosix.NIORegistration> in NIOPosix.MultiThreadedEventLoopGroup.init(numberOfThreads: Swift.Int) -> NIOPosix.MultiThreadedEventLoopGroup at MultiThreadedEventLoopGroup.swift, initializer=0x0000000107069314 AsyncHTTPClientTests`partial apply forwarder for reabstraction thunk helper from @escaping @callee_guaranteed (@in_guaranteed NIOPosix.NIOThread) -> (@out ()) to @escaping @callee_guaranteed (@guaranteed NIOPosix.NIOThread) -> () at <compiler-generated>, metricsDelegate=nil, lock=0x000060000112cb40, _loop=0x0000600002a44000) at MultiThreadedEventLoopGroup.swift:123:41
    frame #2542: 0x0000000107065fbc AsyncHTTPClientTests`partial apply for closure #1 in static MultiThreadedEventLoopGroup.setupThreadAndEventLoop(name:parentGroup:selectorFactory:initializer:metricsDelegate:) at <compiler-generated>:0
    frame #2543: 0x00000001070f73ec AsyncHTTPClientTests`thunk for @escaping @callee_guaranteed (@guaranteed NIOThread) -> () at <compiler-generated>:0
    frame #2544: 0x00000001070fb108 AsyncHTTPClientTests`closure #1 in static ThreadOpsPosix.run($0=0x60000112cba0) at ThreadPosix.swift:133:17
    frame #2545: 0x00000001070fb1c0 AsyncHTTPClientTests`@objc closure #1 in static ThreadOpsPosix.run(handle:args:detachThread:) at <compiler-generated>:0
    frame #2546: 0x0000000186aa82e4 libsystem_pthread.dylib`_pthread_start + 136

@weissi weissi linked a pull request Nov 22, 2024 that will close this issue
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fix 784: dont crash on huge in-memory bodies weissi/async-http-client
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