This failure has been coming up very intermittently for a while when running TestFoundation locally.

Though we have a new commit in URLSession (015ded4d70a7cf4b2741d7206fc60a3d1ceffe03), I don't think that change can trigger this failure. Nevertheless, I'll try to reproduce it locally and investigate.  

Pushkar N Kulkarni,
IBM Runtimes

Simplicity is prerequisite for reliability - Edsger W. Dijkstra wrote: -----
To: Philippe Hausler <>
From: Erik Eckstein via swift-dev
Sent by:
Date: 04/20/2017 10:00AM
Cc: Jim Ingham <>, swift-dev <>
Subject: Re: [swift-dev] [Swift CI] Build Still Failing: OSS - Swift Package - Ubuntu 16.04 (master) #845

Hi Philippe,

this failing test seems to be flaky. Is it possible to fix this? Maybe increase the timeout?

TestFoundation/TestNSURLSession.swift:254: error: TestURLSession.test_downloadTaskWithURLAndHandler : Asynchronous wait failed - Exceeded timeout of 12.0 seconds, with unfulfilled expectations: download task with handler


On Apr 19, 2017, at 9:05 PM, wrote:

New issue found!

[FAILURE] oss-swift-package-linux-ubuntu-16_04 [#845]

Build URL:
Date of build:Wed, 19 Apr 2017 19:42:56 -0700
Build duration:1 hr 22 min

Identified problems:

  • Compile Error: This build failed because of a compile error. Below is a list of all errors in the build log:


  • Commit 86607e9364f583969abccb82fdea5f8470a993c3 by Daniel Dunbar:

    Fix typo in comment.

    • edit: products/libllbuild/public-api/llbuild/buildsystem.h

  • Commit b0dc90bb06d94d5b5296a25cde5ff63a457311ee by Adrian Prantl:

    Fix bug that caused DwarfExpression to drop DW_OP_deref from FI

    • edit: lib/CodeGen/AsmPrinter/DwarfExpression.cpp
    • edit: lib/CodeGen/AsmPrinter/DwarfUnit.cpp
    • edit: lib/CodeGen/AsmPrinter/DwarfDebug.cpp
    • add: test/DebugInfo/X86/fi-expr.ll
    • edit: lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
    • edit: lib/CodeGen/AsmPrinter/DwarfExpression.h

  • Commit d1d460b5a093eb04cba6914a05546a9fd165a589 by Sean Callanan:

    [_expression_ parser] Don't try to materialize empty Swift structs.

    • edit: source/_expression_/Materializer.cpp
    • add: packages/Python/lldbsuite/test/lang/swift/_expression_/empty_self/Makefile
    • add: packages/Python/lldbsuite/test/lang/swift/_expression_/empty_self/
    • add: packages/Python/lldbsuite/test/lang/swift/_expression_/empty_self/main.swift

  • Commit eb173567d971dad88c342d6750cb7b82c7977bd0 by Jim Ingham:

    Fix !N and !-N commands and add a test case.

    • edit: source/Commands/CommandObjectCommands.cpp
    • add: packages/Python/lldbsuite/test/functionalities/history/
    • edit: source/Interpreter/CommandHistory.cpp

  • Commit 1d09ebab8f94055e2b1a7c6057ffca67f72fcc98 by Jim Ingham:

    x-fail this test while Adrian is working on a fix.

    • edit: packages/Python/lldbsuite/test/lang/swift/variables/generic_struct_debug_info/generic_flatmap/

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