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[SR-10813] DispatchWorkItem leak on armv7 #616

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@swift-ci

Description

@swift-ci
Previous ID SR-10813
Radar None
Original Reporter Pogonets (JIRA User)
Type Bug
Additional Detail from JIRA
Votes 0
Component/s libdispatch
Labels Bug, Leak
Assignee None
Priority Medium

md5: 5987bd4bd4977311481d967a3a2e3298

Issue Description:

We found memory leak with DispatchWorkItem on android-armv7
After a quick research, this leak doesn't reproduce on linux x86_64 and android arm64
So looks like it affects all 32bit platforms
Here is a sample:

import Dispatch

let group = DispatchGroup()
let queue = DispatchQueue.global()

class A {
    deinit {
        print("deinit")
    }
}

func test() {
    let a = A()
    queue.async(group: group, execute: DispatchWorkItem {
        print(a)
    })
}

test()
group.wait()

deinit not called
And without DispatchWorkItem this code also works fine

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