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[SR-2920] NSError dynamic conditional cast crash #45514

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swift-ci opened this issue Oct 12, 2016 · 8 comments
Closed

[SR-2920] NSError dynamic conditional cast crash #45514

swift-ci opened this issue Oct 12, 2016 · 8 comments
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself crash Bug: A crash, i.e., an abnormal termination of software regression run-time crash Bug → crash: Swift code crashed during execution swift 3.0

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@swift-ci
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Previous ID SR-2920
Radar rdar://problem/31404281
Original Reporter mhuusko5 (JIRA User)
Type Bug
Status Resolved
Resolution Done
Additional Detail from JIRA
Votes 1
Component/s Compiler
Labels Bug, 3.0Regression, RunTimeCrash
Assignee mhuusko5 (JIRA)
Priority Medium

md5: 97236bb0d0c0b9ccae0498bd9cb7453e

Issue Description:

private func catchError(_ error: NSError) -> Error {
    if let error = error as? URLError {

Could not cast value of type 'NSError' (0x11bab6270) to 'Foundation.URLError' (0x107e7dab0).
@swift-ci
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Comment by Mathew Huusko V (JIRA)

private func catchError(_ error: NSError) -> Error {
 if let error = (error as Swift.Error) as? URLError {

The above doesn't crash.

@belkadan
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@DougGregor, you were looking at something like this, no?

@DougGregor
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I don't recall seeing this issue. mhuusko5 (JIRA User), can you give us some sample code that triggers this?

@swift-ci
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Comment by Mathew Huusko V (JIRA)

That's really I've got really for context/nothing special is happening. An NSError is being passed in from an Objective-C API, and attempting to check if it's a Foundation.URLError crashes every time.

@swift-ci
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Comment by Tomáš Linhart (JIRA)

I have also encountered the problem myself.

It is quite easy to reproduce.

let error = NSError(domain: "RandomDomain", code: 0)
let urlError = error as? URLError

@belkadan
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belkadan commented Apr 3, 2017

Still occurring on master.

@swift-ci create

@jckarter
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Trying a fix for master: #9536
and for 4.0: #9537

@jckarter
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Merged. Should be fixed in future seeds.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
@AnthonyLatsis AnthonyLatsis added the crash Bug: A crash, i.e., an abnormal termination of software label Dec 12, 2022
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself crash Bug: A crash, i.e., an abnormal termination of software regression run-time crash Bug → crash: Swift code crashed during execution swift 3.0
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@jckarter @belkadan @DougGregor @swift-ci @AnthonyLatsis