This seems to be the same failure as here from yesterday:

https://ci.swift.org/job/oss-swift-package-linux-ubuntu-14_04/164/console

I'm pretty confident there haven't been any changes in XCTest in weeks that
would account for a memory error like this.

On Fri, Jan 27, 2017 at 1:33 PM Jordan Rose via swift-dev <
swift-dev@swift.org> wrote:

> None of these changes would have affected the failing XCTest test. Adding
> swift-corelibs-dev.
> https://ci.swift.org//job/oss-swift-incremental-RA-linux-ubuntu-14_04/775/consoleFull#-936285465fca400bf-2f4a-462e-b517-e058d770b2d7
>
> *** Error in
> `/home/buildnode/disk2/workspace/oss-swift-incremental-RA-linux-ubuntu-14_04/swift-corelibs-xctest/Tests/Functional/Asynchronous/Predicates/Expectations/Output/Asynchronous-Predicates':
> double free or corruption (fasttop): 0x00007f7108000a70 ***
>
> error: command failed with exit status: -6
> $ "true"
> $
> "/home/buildnode/disk2/workspace/oss-swift-incremental-RA-linux-ubuntu-14_04/swift-corelibs-xctest/Tests/Functional/xctest_checker/xctest_checker.py"
> "/home/buildnode/disk2/workspace/oss-swift-incremental-RA-linux-ubuntu-14_04/swift-corelibs-xctest/Tests/Functional/Asynchronous/Predicates/Expectations/Output/main.swift.tmp"
> "/home/buildnode/disk2/workspace/oss-swift-incremental-RA-linux-ubuntu-14_04/swift-corelibs-xctest/Tests/Functional/Asynchronous/Predicates/Expectations/main.swift"
> # command stderr:
> Traceback (most recent call last):
>   File
> "/home/buildnode/disk2/workspace/oss-swift-incremental-RA-linux-ubuntu-14_04/swift-corelibs-xctest/Tests/Functional/xctest_checker/xctest_checker.py",
> line 15, in <module>
>     xctest_checker.main.main()
>   File
> "/home/buildnode/disk2/workspace/oss-swift-incremental-RA-linux-ubuntu-14_04/swift-corelibs-xctest/Tests/Functional/xctest_checker/xctest_checker/main.py",
> line 61, in main
>     compare.compare(args.actual, args.expected, args.check_prefix)
>   File
> "/home/buildnode/disk2/workspace/oss-swift-incremental-RA-linux-ubuntu-14_04/swift-corelibs-xctest/Tests/Functional/xctest_checker/xctest_checker/compare.py",
> line 85, in compare
>     repr(expected_line)))
> xctest_checker.error.XCTestCheckerError:
>
> /home/buildnode/disk2/workspace/oss-swift-incremental-RA-linux-ubuntu-14_04/swift-corelibs-xctest/Tests/Functional/Asynchronous/Predicates/Expectations/main.swift:26:
> There were more lines expected to appear than there were lines in the
> actual input. Unmet expectation:
> '.*/Tests/Functional/Asynchronous/Predicates/Expectations/main.swift:32:
> error:
> PredicateExpectationsTestCase.test_immediatelyFalsePredicateAndObject_fails
> : Asynchronous wait failed - Exceeded timeout of 0.1 seconds, with
> unfulfilled expectations: Expect `<NSPredicate: 0x[0-9A-Fa-f]{1,16}>` for
> object <NSObject: 0x[0-9A-Fa-f]{1,16}>'
>
>
>
>
> On Jan 27, 2017, at 12:05, no-re...@swift.org wrote:
>
> [FAILURE] oss-swift-incremental-RA-linux-ubuntu-14_04 [#775]
> Build URL:
> https://ci.swift.org/job/oss-swift-incremental-RA-linux-ubuntu-14_04/775/
> Project: oss-swift-incremental-RA-linux-ubuntu-14_04
> Date of build: Fri, 27 Jan 2017 11:31:23 -0800
> Build duration: 33 minIdentified problems:
>
>    - Compile Error: This build failed because of a compile error. Below
>    is a list of all errors in the build log:
>       - Indication 1
>       
> <https://ci.swift.org//job/oss-swift-incremental-RA-linux-ubuntu-14_04/775/consoleFull#-501506453ee1a197b-acac-4b17-83cf-a53b95139a76>
>    - Regression test failed: This build failed because a regression test
>    in the test suite FAILed. Below is a list of all errors:
>       - Indication 1
>       
> <https://ci.swift.org//job/oss-swift-incremental-RA-linux-ubuntu-14_04/775/consoleFull#-936285465fca400bf-2f4a-462e-b517-e058d770b2d7>
>
>
> Changes
>
>    - Commit *98ead6bf0471f4d7762aeb47b907b9897252a8d4* by *jordan_rose:*
>
>    [Verifier] Always check function DeclName / ParamDecl matches.
>    - *edit*: lib/AST/ASTVerifier.cpp
>
>    - Commit *4020f49f8ee794b8383fff8d2e917311ef678055* by *jordan_rose:*
>
>    [Verifier] Fix ClangImporter imported decls verification.
>    - *edit*: lib/ClangImporter/ImporterImpl.h
>       - *edit*: lib/ClangImporter/ClangImporter.cpp
>
>    - Commit *abb88f94921a962aa19ec39653e62ee05cec48cb* by *jordan_rose:*
>
>    [Verifier] Hack: Don't verify loaded modules in SIL mode.
>    - *edit*: lib/Sema/TypeChecker.cpp
>
>    - Commit *fdbc84f7ec77105b23e2cc8b191112ecd01ba9bb* by *jordan_rose:*
>
>    [Importer] Preserve argument labels even for accessors.
>    - *edit*: lib/ClangImporter/ImportDecl.cpp
>       - *edit*: lib/ClangImporter/ImporterImpl.h
>       - *edit*: test/ClangImporter/Inputs/custom-modules/ObjCParseExtras.h
>       - *edit*: lib/ClangImporter/ImportType.cpp
>       - *edit*: test/ClangImporter/objc_parse.swift
>
>    - Commit *7c8117301aa57ec6cf29d39acb98d1b9f3160f1d* by *github:*
>
>    In Swift 3 mode, allow "tuple unsplatting" in certain cases. (#7077)
>    - *edit*:
>       
> validation-test/compiler_crashers_fixed/26813-generic-enum-tuple-optional-payload.swift
>       - *edit*: test/Constraints/tuple_arguments.swift
>       - *edit*: lib/Sema/CSSimplify.cpp
>       - *edit*: test/Compatibility/tuple_arguments.swift
>       - *edit*:
>       validation-test/Sema/type_checker_crashers_fixed/rdar27261929.swift
>
>    - Commit *02273a094e4630a73d6846844a648770a5587ce9* by
>    *anthony.parker:*
>
>    [Documentation] Add doc comments for NSKeyedArchiver (#842)
>    - *edit*: Foundation/NSKeyedArchiver.swift
>
>
> _______________________________________________
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> swift-dev@swift.org
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>
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