[SR-16079] swiftpm-xctest-helper crashes when swapping sanitizers

[adam-fowler]

Previous ID	SR-16079
Radar	None
Original Reporter	@adam-fowler
Type	Bug

Environment

swift-driver version: 1.45.2 Apple Swift version 5.6 (swiftlang-5.6.0.323.62 clang-1316.0.20.8)

Target: x86_64-apple-macosx12.0

Additional Detail from JIRA

Votes	0
Component/s	Package Manager
Labels	Bug
Assignee	None
Priority	Medium

md5: 81090cc4329894afe64d435f0c2d4b6d

Issue Description:

It is possible to hang `swift test` by building your package using the address sanitizer and then requesting to list tests while skipping build and using the thread sanitizer. It appears `swift test` is waiting on results from `swiftpm-xctest-helper`. When you kill the `swift test` process it does not kill the `swiftpm-xctest-helper` process which continues to use 100% of one processor and will run indefinitely.

Repro steps:

git clone https://github.com/apple/swift-nio
cd swift-nio
swift build --sanitize=address --build-tests
swift test --list-tests --skip-build --sanitize=thread

Expected:

`swift test` call will either successfully return an error or provide the list of tests

Actual:

`swift test` never returns and leaves an orphaned process `swiftpm-xctest-helper` when killed.

This only occurs on macOS

[tomerd]

@swift-ci create

[adam-fowler]

I thought I would verify this is still an issue. The issue has changed. It now crashes with the following message

[1/1] Planning builderror: signalled(6): /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/libexec/swift/pm/swiftpm-xctest-helper /Users/adamfowler/Developer/server/apple/swift-nio/.build/arm64-apple-macosx/debug/swift-nioPackageTests.xctest /var/folders/6v/zhyq15kx1fz1d9hjv1zq9n8c0000gn/T/TemporaryFile.TIzRGK output:
    ==57849==Unable to find a memory range for dynamic shadow.
    ==57849==space_size = 0x100000003fff, largest_gap_found = 0x017ffffe0000, max_occupied_addr = 0x7e8000000000, new_max_vm = 0x0bfffff00000
    AddressSanitizer: CHECK failed: sanitizer_mac.cpp:1274 "((0 && "cannot place shadow")) != (0)" (0x0, 0x0) (tid=275360)
        <empty stack>