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[SR-14233] [AutoDiff] Weird runtime behavior when printing @differentiable functions #54757

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dan-zheng opened this issue Mar 6, 2020 · 1 comment
Closed

[SR-14233] [AutoDiff] Weird runtime behavior when printing @differentiable functions #54757

dan-zheng opened this issue Mar 6, 2020 · 1 comment
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AutoDiff bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself

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@dan-zheng
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Previous ID SR-14233
Radar None
Original Reporter @dan-zheng
Type Bug
Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug, AutoDiff
Assignee None
Priority Medium

md5: 774bac7247c22922195bf596aa93de79

relates to:

Issue Description:

func id(_ x: Float) -> Float { x }
let functions: [@differentiable (Float) -> Float] = [id]
print(functions)

Immediate:

$ swift fn.swift
Stack dump:
0.  Program arguments: /Library/Developer/Toolchains/swift-tensorflow-DEVELOPMENT-2020-03-04-a.xctoolchain/usr/bin/swift -frontend -interpret fn.swift -enable-objc-interop -sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk -color-diagnostics -module-name fn
0  swift                    0x0000000112562e75 llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 37
1  swift                    0x00000001125620b5 llvm::sys::RunSignalHandlers() + 85
2  swift                    0x000000011256345c SignalHandler(int) + 268
3  libsystem_platform.dylib 0x00007fff6c1b642d _sigtramp + 29
4  swift                    0x0000000114dc6e4b cmark_strbuf__initbuf + 175006
5  swift                    0x000000011240546b llvm::ConstantDataSequential::~ConstantDataSequential() + 27
6  swift                    0x000000011240546b llvm::ConstantDataSequential::~ConstantDataSequential() + 27
7  swift                    0x0000000112403874 llvm::LLVMContextImpl::~LLVMContextImpl() + 14948
8  swift                    0x00000001123fde16 llvm::LLVMContext::~LLVMContext() + 22
9  swift                    0x000000010f524293 llvm::object_deleter<llvm::LLVMContext>::call(void*) + 19
10 swift                    0x0000000112506fc8 llvm::llvm_shutdown() + 120
11 swift                    0x00000001124de043 llvm::InitLLVM::~InitLLVM() + 19
12 swift                    0x000000010e4298b0 main + 912
13 libdyld.dylib            0x00007fff6bfbd7fd start + 1

Compilation:

$ swiftc fn.swift
$ ./fn
3.1621606e-34

The weird value looks like some memory error (e.g. use after free). But SIL verification didn't catch it.
@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
@BradLarson
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This no longer produces a segfault or bad memory access, it prints [(Function)]. I think it's probably safe to close out this older issue.

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AutoDiff bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself
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@BradLarson @dan-zheng