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[SR-5972] libdispatch memory violation #677

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swift-ci opened this issue Sep 23, 2017 · 2 comments
Closed

[SR-5972] libdispatch memory violation #677

swift-ci opened this issue Sep 23, 2017 · 2 comments
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bug libdispatch

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@swift-ci
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Previous ID SR-5972
Radar None
Original Reporter nuclearace (JIRA User)
Type Bug
Status Closed
Resolution Done
Environment

Ubuntu 16.04, 16.10

Swift version 4.0 (swift-4.0-RELEASE)

Target: x86_64-unknown-linux-gnu

Additional Detail from JIRA
Votes 0
Component/s libdispatch
Labels Bug
Assignee None
Priority Medium

md5: 8b0c0306b034e4b23f88cfb8bef764f6

relates to:

  • SR-5936 URLSession crash with concurrent access

Issue Description:

The following code seems to cause a crash related to double freeing:

import CoreFoundation
import Foundation

let session = URLSession(configuration: .default)

for _ in 0..<10 {
    session.dataTask(with: URL(string: "https://google.com/")!) {data, resp, err in
        print(resp!)
    }.resume()
}

CFRunLoopRun()

Crashes with:

*** Error in `./main': double free or corruption (fasttop): 0x00007f9cb4000e30 ***
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x790cb)[0x7f9cd192f0cb]
/lib/x86_64-linux-gnu/libc.so.6(+0x8275a)[0x7f9cd193875a]
/lib/x86_64-linux-gnu/libc.so.6(cfree+0x4c)[0x7f9cd193c18c]
/home/erik/.swiftenv/versions/4.0/usr/lib/swift/linux/libdispatch.so(+0x4ee4c)[0x7f9cd3d45e4c]
/home/erik/.swiftenv/versions/4.0/usr/lib/swift/linux/libdispatch.so(+0x48ddc)[0x7f9cd3d3fddc]
/home/erik/.swiftenv/versions/4.0/usr/lib/swift/linux/libdispatch.so(+0x49c52)[0x7f9cd3d40c52]
/home/erik/.swiftenv/versions/4.0/usr/lib/swift/linux/libdispatch.so(+0x440f5)[0x7f9cd3d3b0f5]
/home/erik/.swiftenv/versions/4.0/usr/lib/swift/linux/libdispatch.so(+0x44581)[0x7f9cd3d3b581]
/home/erik/.swiftenv/versions/4.0/usr/lib/swift/linux/libdispatch.so(+0x4adbd)[0x7f9cd3d41dbd]
/home/erik/.swiftenv/versions/4.0/usr/lib/swift/linux/libdispatch.so(+0x4acee)[0x7f9cd3d41cee]
/home/erik/.swiftenv/versions/4.0/usr/lib/swift/linux/libdispatch.so(+0x46dc8)[0x7f9cd3d3ddc8]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x770a)[0x7f9cd293370a]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x5f)[0x7f9cd19be0af]

I apologize for the rather vague report, but I'm not entirely sure the best way to pin this down further.
@swift-ci
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Comment by Erik Little (JIRA)

Someone's told me that this might have already been fixed in the latest development release.

@swift-ci
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Comment by Erik Little (JIRA)

Seems fixed in the latest 4.0.1 snapshot.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
@shahmishal shahmishal transferred this issue from apple/swift May 5, 2022
This issue was closed.
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