That doesn't look symbolicated. If it were symbolicated, and the build used -g, you would have a file and line number for the main+345 frame.
> On May 2, 2017, at 2:31 PM, Nick Snyder via swift-users > <swift-users@swift.org> wrote: > > In practice, I would need the stack trace first to figure out how to > reproduce the issue, so lldb doesn't really help. > > How would I go about symbolicating this further on macOS (Xcode or otherwise)? > > From reading the docs it seems like the crash report I get is already > completely symbolicated: > https://developer.apple.com/library/content/technotes/tn2151/_index.html#//apple_ref/doc/uid/DTS40008184-CH1-SYMBOLICATION-_DETERMINING_WHETHER_A_CRASH_REPORT_IS_SYMBOLICATED > > <https://developer.apple.com/library/content/technotes/tn2151/_index.html#//apple_ref/doc/uid/DTS40008184-CH1-SYMBOLICATION-_DETERMINING_WHETHER_A_CRASH_REPORT_IS_SYMBOLICATED> > > On Tue, May 2, 2017 at 1:21 AM, Alex Blewitt <alb...@apple.com > <mailto:alb...@apple.com>> wrote: > If you can reproduce it, and run it under lldb, it will print the source line > for you: > > $ lldb .build/debug/main > (lldb) target create ".build/debug/main" > ruCurrent executable set to '.build/debug/main' (x86_64). > (lldb) run > Process 19013 launched: '/private/tmp/main/.build/debug/main' (x86_64) > Hello, world! > fatal error: unexpectedly found nil while unwrapping an Optional value > 2017-05-02 09:17:11.351608+0100 asdf[19013:54205130] fatal error: > unexpectedly found nil while unwrapping an Optional value > Current stack trace: > 0 libswiftCore.dylib 0x00000001002c1160 swift_reportError > + 125 > 1 libswiftCore.dylib 0x00000001002ddac0 > _swift_stdlib_reportFatalError + 60 > 2 libswiftCore.dylib 0x00000001000ce260 specialized > specialized StaticString.withUTF8Buffer<A> ((UnsafeBufferPointer<UInt8>) -> > A) -> A + 342 > 3 libswiftCore.dylib 0x0000000100249120 partial apply for > (_fatalErrorMessage(StaticString, StaticString, file : StaticString, line : > UInt, flags : UInt32) -> Never).(closure #2) + 109 > 4 libswiftCore.dylib 0x00000001000ce260 specialized > specialized StaticString.withUTF8Buffer<A> ((UnsafeBufferPointer<UInt8>) -> > A) -> A + 342 > 5 libswiftCore.dylib 0x00000001001fbd00 specialized > _fatalErrorMessage(StaticString, StaticString, file : StaticString, line : > UInt, flags : UInt32) -> Never + 96 > 6 main 0x0000000100001340 say(message : > String?) -> () + 248 > 7 main 0x00000001000011e0 main + 328 > 8 libdyld.dylib 0x00007fffb444d234 start + 1 > Process 19013 stopped > * thread #1, queue = 'com.apple.main-thread', stop reason = > EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0) > frame #0: 0x00000001001fbd60 libswiftCore.dylib`function signature > specialization <preserving fragile attribute, Arg[2] = Dead, Arg[3] = Dead> > of Swift._fatalErrorMessage (Swift.StaticString, Swift.StaticString, file : > Swift.StaticString, line : Swift.UInt, flags : Swift.UInt32) -> Swift.Never + > 96 > libswiftCore.dylib`function signature specialization <preserving fragile > attribute, Arg[2] = Dead, Arg[3] = Dead> of Swift._fatalErrorMessage > (Swift.StaticString, Swift.StaticString, file : Swift.StaticString, line : > Swift.UInt, flags : Swift.UInt32) -> Swift.Never: > -> 0x1001fbd60 <+96>: ud2 > 0x1001fbd62 <+98>: nopw %cs:(%rax,%rax) > > libswiftCore.dylib`protocol witness table accessor for <A> > Swift.AnySequence<A> : Swift.Sequence in Swift: > 0x1001fbd70 <+0>: pushq %rbp > 0x1001fbd71 <+1>: movq %rsp, %rbp > > (lldb) bt > * thread #1, queue = 'com.apple.main-thread', stop reason = > EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0) > * frame #0: 0x00000001001fbd60 libswiftCore.dylib`function signature > specialization <preserving fragile attribute, Arg[2] = Dead, Arg[3] = Dead> > of Swift._fatalErrorMessage (Swift.StaticString, Swift.StaticString, file : > Swift.StaticString, line : Swift.UInt, flags : Swift.UInt32) -> Swift.Never + > 96 > frame #1: 0x0000000100001438 main`say(message=nil) -> () at main.swift:5 > frame #2: 0x0000000100001328 main`main at main.swift:8 > frame #3: 0x00007fffb444d235 libdyld.dylib`start + 1 > frame #4: 0x00007fffb444d235 libdyld.dylib`start + 1 > > There is a symbolication tool available for Linux in the > ~/swift/utils/symbolicate-linux-fatal, and Xcode can do the same > symbolication for you as well. > > Alex > >> On 28 Apr 2017, at 22:28, Nick Snyder via swift-users <swift-users@swift.org >> <mailto:swift-users@swift.org>> wrote: >> >> I have a simple main.swift that looks like this: >> >> ``` >> print("Hello, world!") >> let x: String? = nil >> >> func say(message: String?) { >> print(x!) // intentional crash >> } >> >> say(message: x) >> ``` >> >> Running this results in the crash >> >> ``` >> $ swift build && ./.build/debug/hello >> Hello, world! >> fatal error: unexpectedly found nil while unwrapping an Optional value >> Current stack trace: >> 0 libswiftCore.dylib 0x0000000110120130 swift_reportError >> + 129 >> 1 libswiftCore.dylib 0x000000011013cb50 >> _swift_stdlib_reportFatalError + 60 >> 2 libswiftCore.dylib 0x000000010ff2d250 specialized >> specialized StaticString.withUTF8Buffer<A> ((UnsafeBufferPointer<UInt8>) -> >> A) -> A + 342 >> 3 libswiftCore.dylib 0x00000001100a7e90 partial apply for >> (_fatalErrorMessage(StaticString, StaticString, file : StaticString, line : >> UInt, flags : UInt32) -> Never).(closure #2) + 109 >> 4 libswiftCore.dylib 0x000000010ff2d250 specialized >> specialized StaticString.withUTF8Buffer<A> ((UnsafeBufferPointer<UInt8>) -> >> A) -> A + 342 >> 5 libswiftCore.dylib 0x000000011005a9a0 specialized >> _fatalErrorMessage(StaticString, StaticString, file : StaticString, line : >> UInt, flags : UInt32) -> Never + 96 >> 6 hello 0x000000010fee6200 main + 345 >> 7 libdyld.dylib 0x00007fffe0375234 start + 1 >> Illegal instruction: 4 >> ``` >> >> From the crash, how do I map back line 6 to an actual line in main.swift? 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