[swift-dev] [swift-lldb-dev] [Swift CI] Build Failure: OSS - Swift Package - Ubuntu 15.10 (master) #1930

Todd Fiala todd.fiala at gmail.com
Fri Aug 19 16:22:19 CDT 2016 

First off, I think the whole LLDB team can agree on the simple principle
that tests that sometimes fail is not something we’re shooting for, so
we’re on the same page with the general sentiment.

But, rather than talking in sweeping generalizations, let’s take this exact
failure as an example.  It was a socket attempting to connect.  It uses
general socket timeouts.  If it’s using a default, it will typically be
something like 30 seconds.  Per my previous comment, this is not something
we see fail with any kind of frequency.  We just had a failure on it now.
Is the solution to say we want 35 seconds?  1 minute?  2 minutes?  We’re
using end-to-end testing here, and therefore we are subject to how a real
system behaves.  If we crank that up, there could be a time where we
overload the server further, and the socket facility just fails.  What do
you do then, claim the test as unworthy?

The challenge we run into on LLDB is that, while we do have a growing
number of unit tests that are strict input/output verification, far too
much of a functioning debugger’s operations are not covered adequately by
that.  So we have a large body of end to end tests.  Sometimes those fail
under heavy load.  Sometimes those issues are ours - we have hidden races
that are only exposed when the machine is grinding to a halt.  Sometimes it
is that the OS fails to handle requests for resources that the debugger
needs.

So it isn’t as simple as saying “file a bug to make the LLDB test suite
more reliable.”  (I wish it were!)

On the positive side, we have more resources going into improving our
quality in the upcoming months, and we now have a dedicated quality
engineer working with us.  I expect this will help things as we move
forward.  And we’re looking to sink some of the system testing that
currently exists end-to-end in LLDB to a more input-output style testing
that we can do without needing the whole of LLDB (e.g. DWARF verification,
DWARF type round-tripping through the compiler, etc. - Greg and Sean can
speak more to what we’re doing there).

The net effect is that we should be hitting less of this noise.

-Todd

On August 19, 2016 at 2:10:14 PM, Daniel Dunbar via swift-lldb-dev (
swift-lldb-dev at swift.org) wrote:

The amount of flakiness in the LLDB tests is disturbing... is there a
high-level bug tracking improving this? It seems like it might be worth
running a stress test of the tests on a loaded machine to try and shake out
such problems.

 - Daniel

On Aug 19, 2016, at 1:58 PM, Todd Fiala via swift-lldb-dev <
swift-lldb-dev at swift.org> wrote:


On Aug 19, 2016, at 1:42 PM, Enrico Granata <egranata at apple.com> wrote:


On Aug 19, 2016, at 11:20 AM, Todd Fiala via swift-lldb-dev <
swift-lldb-dev at swift.org> wrote:

It looks like this may be the packaging build:

oss-swift-package-linux-ubuntu-15_10


It was this build:

https://ci.swift.org/job/oss-swift-package-linux-ubuntu-15_10/1930/consoleFull#465392916fca400bf-2f4a-462e-b517-e058d770b2d7

It has since gone blue.

I don’t think I recall ever seeing that test fail before in an intermittent
way, but that might be what happened here.


Given the failure mode, it does sound likely:

File "/usr/lib/python2.7/socket.py", line 206, in accept sock, addr =
self._sock.accept() timeout: timed out



If we see that again, we may be able to tweak the socket timeout to allow
for heavily loaded test CI.

-Todd

On Aug 19, 2016, at 11:15 AM, Kate Stone via swift-lldb-dev <
swift-lldb-dev at swift.org> wrote:

Where is this failure being reported?  I’m not seeing anything on
swift-3.0-branch or master on ci.swift.org.

Kate Stone k8stone at apple.com
 Xcode Low Level Tools

On Aug 19, 2016, at 12:15 AM, mishal_shah via swift-lldb-dev <
swift-lldb-dev at swift.org> wrote:

+ swift-lldb-dev group.

On Aug 18, 2016, at 9:47 PM, Daniel Dunbar <daniel_dunbar at apple.com> wrote:

Failing in lldb:
Command invoked:
/home/buildnode/jenkins/workspace/oss-swift-package-linux-ubuntu-15_10/lldb/test/dotest.py
--executable
/home/buildnode/jenkins/workspace/oss-swift-package-linux-ubuntu-15_10/build/buildbot_linux/lldb-linux-x86_64/bin/lldb
--rerun-all-issues -C
/home/buildnode/jenkins/workspace/oss-swift-package-linux-ubuntu-15_10/build/buildbot_linux/llvm-linux-x86_64/bin/clang
-s 2016-08-18-15_15_07 --results-port 41187 --inferior -p
TestStubReverseConnect.py
/home/buildnode/jenkins/workspace/oss-swift-package-linux-ubuntu-15_10/lldb/packages/Python/lldbsuite/test
--event-add-entries worker_index=14:int Configuration: arch=x86_64
compiler=/home/buildnode/jenkins/workspace/oss-swift-package-linux-ubuntu-15_10/build/buildbot_linux/llvm-linux-x86_64/bin/clang
----------------------------------------------------------------------
Collected 2 tests
======================================================================
ERROR: test_reverse_connect_works_llgs
(TestStubReverseConnect.TestStubReverseConnect)
----------------------------------------------------------------------
Traceback (most recent call last): File
"/home/buildnode/jenkins/workspace/oss-swift-package-linux-ubuntu-15_10/lldb/packages/Python/lldbsuite/test/decorators.py",
line 121, in wrapper func(*args, **kwargs) File
"/home/buildnode/jenkins/workspace/oss-swift-package-linux-ubuntu-15_10/lldb/packages/Python/lldbsuite/test/decorators.py",
line 121, in wrapper func(*args, **kwargs) File
"/home/buildnode/jenkins/workspace/oss-swift-package-linux-ubuntu-15_10/lldb/packages/Python/lldbsuite/test/tools/lldb-server/commandline/TestStubReverseConnect.py",
line 89, in test_reverse_connect_works_llgs self.reverse_connect_works()
File
"/home/buildnode/jenkins/workspace/oss-swift-package-linux-ubuntu-15_10/lldb/packages/Python/lldbsuite/test/tools/lldb-server/commandline/TestStubReverseConnect.py",
line 67, in reverse_connect_works (stub_socket, address) =
self.listener_socket.accept() File "/usr/lib/python2.7/socket.py", line
206, in accept sock, addr = self._sock.accept() timeout: timed out
Config=x86_64-/home/buildnode/jenkins/workspace/oss-swift-package-linux-ubuntu-15_10/build/buildbot_linux/llvm-linux-x86_64/bin/clang-3.9
---------------------------------------------------------------------- Ran
2 tests in 22.006s RESULT: FAILED (0 passes, 0 failures, 1 errors, 1
skipped, 0 expected failures, 0 unexpected successes) Session logs for test
failures/errors/unexpected successes can be found in directory
'2016-08-18-15_15_07' [TestStubReverseConnect.py FAILED] Command invoked:
/usr/bin/python
/home/buildnode/jenkins/workspace/oss-swift-package-linux-ubuntu-15_10/lldb/test/dotest.py
--executable
/home/buildnode/jenkins/workspace/oss-swift-package-linux-ubuntu-15_10/build/buildbot_linux/lldb-linux-x86_64/bin/lldb
--rerun-all-issues -C
/home/buildnode/jenkins/workspace/oss-swift-package-linux-ubuntu-15_10/build/buildbot_linux/llvm-linux-x86_64/bin/clang
-s 2016-08-18-15_15_07 --results-port 41187 --inferior -p
TestStubReverseConnect.py
/home/buildnode/jenkins/workspace/oss-swift-package-linux-ubuntu-15_10/lldb/packages/Python/lldbsuite/test
--event-add-entries worker_index=14:int

 - Daniel

On Aug 18, 2016, at 9:18 PM, no-reply at swift.org wrote:

[FAILURE] oss-swift-package-linux-ubuntu-15_10 [#1930]
Build URL:
https://ci.swift.org/job/oss-swift-package-linux-ubuntu-15_10/1930/
Project: oss-swift-package-linux-ubuntu-15_10
Date of build: Thu, 18 Aug 2016 20:26:52 -0700
Build duration: 51 min Identified problems:

   - 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-package-linux-ubuntu-15_10/1930/consoleFull#465392916fca400bf-2f4a-462e-b517-e058d770b2d7>


Changes

   - Commit *2ebab526bfd7a5ce6ef460bebee0399fe669612d* by *xi_ge:*

   [FixCode] Apply coercion fixits on return statement and initialization
   - *edit*: test/FixCode/fixits-apply-objc.swift
      - *edit*: test/FixCode/fixits-apply-objc.swift.result
      - *edit*: lib/Sema/CSDiag.cpp
      - *edit*: test/FixCode/fixits-apply.swift.result
   -
   - Commit *6447a2d16edcfbceab940d58a321b3ef70525f1a* by *daniel_dunbar:*

   [Basic] Update Thread shim to match changes on Linux side.
   - *edit*: Sources/Basic/Thread.swift



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Thanks,
*- Enrico*
📩 egranata@ <about:blank> <about:blank>.com <about:blank> ☎️ 27683


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