Segmentation Fault: 11 - Xcode 6.3

问题:

Can't archive

My app runs fine (Xcode 6.3.2, swift based) on Simulator and on multiple devices. But when I try to archive it I get the error Command failed due to signal: Segmentation fault: 11.

Others face same problem

Segmentation Fault 11 when running Swift app

"Command failed due to signal: Segmentation fault: 11" - What is the issue?

Command failed due to signal: Segmentation fault: 11

Root cause?

But it seems that each have different reasons for getting the error.. I am unable to comprehend the error message I am getting. Posted below, any hints or tips would be greatly appreciated!

Error log

0  swift                    0x0000000108e5d2b8 llvm::sys::PrintStackTrace(__sFILE*) + 40
1  swift                    0x0000000108e5d794 SignalHandler(int) + 452
2  libsystem_platform.dylib 0x00007fff8897bf1a _sigtramp + 26
3  libsystem_platform.dylib 0x00007fff574b7b28 _sigtramp + 3467885608
4  swift                    0x0000000108a053f2 swift::serialization::Serializer::writeCrossReference(swift::Decl const*) + 578
5  swift                    0x0000000108a0e275 swift::serialization::Serializer::writeAllDeclsAndTypes() + 2181
6  swift                    0x0000000108a0f2f8 swift::serialization::Serializer::writeAST(llvm::PointerUnion<swift::Module*, swift::SourceFile*>) + 2600
7  swift                    0x0000000108a11960 swift::serialization::Serializer::writeToStream(llvm::raw_ostream&, llvm::PointerUnion<swift::Module*, swift::SourceFile*>, swift::SILModule const*, swift::SerializationOptions const&) + 144
8  swift                    0x0000000108a12521 swift::serialize(llvm::PointerUnion<swift::Module*, swift::SourceFile*>, swift::SerializationOptions const&, swift::SILModule const*) + 321
9  swift                    0x0000000108746c1a frontend_main(llvm::ArrayRef<char const*>, char const*, void*) + 5514
10 swift                    0x00000001087454e6 main + 1814
11 libdyld.dylib            0x00007fff8db235c9 start + 1
12 libdyld.dylib            0x0000000000000080 start + 1917700792

回答1:

Solved it. Problem was two things: 1) Converting to Double 2) Handling an empty array

Converting to Double

Changed from var lat: Double? = d["lat"].doubleValue to var lat: Double? = Double(d["lat"].doubleValue)

Handling an empty array

Changed from

let brands = d["brands_unfiltered"].arrayValue {
if brands == [] {
    // Do nothing (empty)
}
else{
    // Do stuff
}

To

if let brands = d["brands_unfiltered"].arrayValue as Array! {
     // Do stuff
}

To find the root cause I deactivated larges part of the code until I found what got the archiving not to function. Thereafter the solution was pretty straight forward. Hope this helps someone else struggling with the same error.

回答2:

I found the code that cause my "Archive" action to fail with this error "Command failed due to signal: Segmentation fault: 11"

When I use the indexPath in the cellForRowAtIndexPath function, I need to put an exclamation mark (i.e indexPath! instead of indexPath). However, I still puzzled by why there is such error if I omit the exclamation mark. Does anyone know the reason?

    override func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!, object: PFObject!) -> PFTableViewCell! {

            // code to get cell, etc

            let thumbnailImage = self.userPhotos?.getFromCacheOrDownload(username,
                circle: team.circle(), delegate: self, indexPath: indexPath!)
            cell.userPhotoImageView.image = thumbnailImage

            return cell
}