> On May 18, 2017, at 12:54 PM, Pushkar N Kulkarni via swift-dev
> <swift-...@swift.org> wrote:
>
> Over the past few months, we've seen random and intermittent failures in the
> URLSession tests in TestFoundation in the CI builds running on Ubuntu 16.04.
> Surprisingly, these failures never occur on PR builds. We've tried to
> reproduce them locally (on matching Ubuntu levels) and fixed locally observed
> issues, assuming those were the issues that broke the CI.
>
> However, the tests continue to intermittently fail in the CI and we seemed to
> have reached a point where we simply aren't able to reproduce these failures
> locally - we tried 2/4/16CPU with 8G/16G memory running Ubuntu 16.04 on bare
> metal. Even if we are able to reproduce, as is in the case of a segfault,
> there's no way to ascertain that the local failures have the same causes (e.g
> backtrace for a segfault) as the ones in the CI.
>
> I have two questions in this context:
> 1. Is there a way to collect failure data from the CI environment - core
> dumps on a crash or thread stacks on a timeout (I don't think XCTest helps) ?
Please send me email with build you are seeing failure with, and where on the
system the core dump is located.
> 2. Is there a way to obtain more information about the environment - is it
> virtualised, # of CPU cores, memory size, CPU/memory available for each
> build, what's the load (CPU/memory utilisation)?
I updated the CI Jobs to display following info for each build. Please let me
know if you would like see additional info.
========================
OS Info:
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.10
Release: 16.10
Codename: yakkety
CPU Info:
CPU op-mode(s): 32-bit, 64-bit
CPU(s): 48
Thread(s) per core: 2
Core(s) per socket: 12
Socket(s): 2
CPU family: 6
CPU MHz: 2600.000
CPU max MHz: 2600.0000
CPU min MHz: 1200.0000
Free:
total used free shared buff/cache available
Mem: 65860844 3029364 48991112 47452 13840368 62111280
Swap: 999420 271228 728192
Uptime:
19:39:19 up 195 days, 1:51, 0 users, load average: 18.37, 25.89, 42.99
Number of executors: 4
========================
https://ci.swift.org/job/oss-swift-incremental-RA-linux-ubuntu-16_10/3733/consoleFull
Thanks,
Mishal Shah
>
> In general, I'd be really helpful to have some suggestions about how to go
> about debugging failures that are being observed ONLY in the CI.
>
> Thanks!
> Pushkar N Kulkarni,
> IBM Runtimes
>
> Simplicity is prerequisite for reliability - Edsger W. Dijkstra
>
>
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