Swift5.2.4 has a runtime error,

Using Swift
1

Hi:
My English is very poor, hope someone can understand and help me.

There is a runtime error in swift5.2.4. When I type swift in ubuntu 18.04 to test, a crash occurs.
When the compilation is complete, it seems that the release mode crashes directly, while the debug mode crashes only after using Process.Run.

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2

Hi @martinlau, could you provide more details with how Process.run is used? Is this reproducible with any Swift code, or a specific project/file? Could you show the source code snippet then that's causing the crash? Also, how exactly was the Swift distribution installed on Ubuntu 18.04?

3

Hi @Max_Desiatov, I installed swift on Ubuntu 18.04 according to the guide in swift.org.
For Process crash I only apply the following simple code:

let pipe = Pipe()
let task = Process()
task.standardError = pipe
if #available(OSX 10.13, *) {
    task.executableURL = URL(fileURLWithPath: "/usr/bin/zip")
    task.currentDirectoryURL = URL(fileURLWithPath: folder)
    try task.run()
} else {
    task.launchPath = "/usr/bin/zip"
    task.currentDirectoryPath = folder
    task.launch()
}
var data = pipe.fileHandleForReading.readDataToEndOfFile()
while task.isRunning {
    data = pipe.fileHandleForReading.readDataToEndOfFile()
}
4

Running the compiled program outputs the following error:

[1] 17163 segmentation fault .build/debug/MagicSignature

I got the following error log via shell $ dmesg :

segfault at 7f0725e279e0 ip 00007f0725a6a3bd sp 00007ffdcad41510 error 7 in libicui18nswift.so.65.1 [7f072590c000 + 319000]
5

cc @millenomi

6

Can we get a proper backtrace via lldb?

7

I am not familiar with the use of lldb, this is my first time using swift on Linux.

8

Thanks for sharing this, but I'm not able to reproduce it since this doesn't seem to be a complete snippet. When I try to run it, I get these errors:

test.swift:8:53: error: use of unresolved identifier 'folder'
    task.currentDirectoryURL = URL(fileURLWithPath: folder)
                                                    ^~~~~~
test.swift:12:33: error: use of unresolved identifier 'folder'
    task.currentDirectoryPath = folder

Would you be able to share the complete code so that others could reproduce the error and provide help in diagnosing the issue?

1 Like
9

Since I updated Swift 5.6 this bug has somehow disappeared, I am not sure if there is something wrong with my environment