September 2017 - Pharo-dev - lists.pharo.org

Re: [Pharo-dev] [ci-announces] [CI] July 28, 2017 Incident Report
by David T. Lewis Sept. 22, 2017

Sept. 22, 2017

Kudos for providing a good incident report and explanation of the cause of the problem. I know little about this actual incident, but that it not important. It is really good to see constructive responses to problems like this with a focus on inprovement and problem prevention in the future. Dave On Thu, Sep 21, 2017 at 03:35:19PM +0200, Christophe Demarey wrote: > July 28, 2017 Incident Report > > This summer, we experienced a hard incident on the Continuous Integration service infrastructure.Today we???re providing an incident report that details the nature of the incident and our response. > We understand this service issue has impacted all Inria developers using the CI service and their valued time, and we apologize to everyone who was affected. > > Issue summary > Due to a manipulation error, a lot of Virtual Machines (VM) hosted on CloudStack were destroyed and not recoverable! > Jenkins servers are not concerned by this issue, so all Jenkins jobs and history are safe. > > Root cause > After the successful migration of Jenkins servers and security fixes (July 18-19, 2017), a few projects were not able to reach their slaves hosted on the CI build farm. This problem was due to a synchronization problem between the CI database and CloudStack (powering the CI build farm) having its own way to manage projects and users (through domains). > An attempt to reproduce and debug this problem on the qualification infrastructure failed. So, we added some logging on the production infrastructure. To avoid troubles to the production infrastructure, we limited the synchronization to one project. It was the mistake! > The synchronization of one project led to the deletion of all other CloudStack domains (i.e. projects). Indeed, the synchronization code expected to get the full environment (all CI projects) and if it finds a domain not bound to a CI project, it deletes it... > The synchronization process was aborted before its termination but it was too late. Some user Virtual Machines were still alive during some hours but were finally purged by CloudStack. > It means we lost most VM and templates hosted on the CI build farm. > > Resolution and recovery > It was impossible to recover destroyed virtual machines. CloudStack is configured to keep VM data 24 hours before actually destroying it but it does not work when the domain hosting the VM is destroyed. > Primary storage hosting running VM is a high-performance and very expensive storage. That???s why the CI team chose (at the CI service setup) to do not backup VM but rather to rely on both the expunge delay and the snapshot / template mechanism to save VM state. This mechanism was useless in relation to this incident. > Templates and snapshots are hosted on the secondary storage that is a redundant storage in two different buildings to ensure data reliability and recovery. The incident led CloudStack to perform a ?? clean ?? deletion of all the domain data including templates. That???s why they also became unavailable. > > We were able to rebuild all domains from the CI database but CI service users had to create new VM to replace the destroyed ones. > > Corrective and preventative measures > All members of the CI team (DSI, SED) worked and are still working all together to find the best solution to mitigate the incident and prevent same situations in the future. > The synchronization code responsible of the deletion of CloudStack domain has been deactivated. CloudStack domain deletion is a critical action and will no longer be automated. Deletions will be reviewed and approved by the CI team before being completed. > This incident showed us that backup mechanism in place are not strong enough and we are now evaluating the cost to backup, with history: > all VM, snapshots and templates or > all snapshots and templates. > We are also working on providing a way to download templates created on CloudStack so that you can easily get a copy of them. We encourage you to create templates for virtual machines that are time consuming to set up from scratch. > > > Sincerely, > The CI Team

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Pharo7 and full block closures
by Holger Freyther Sept. 22, 2017

Sept. 22, 2017

Hi, I kind of missed the open alpha of "Scorch" and to make up for it I tried to follow the instructions on Pharo7 but I do crash the VM. Is that to be expected? "Add special selector for trap instruction" Smalltalk specialObjectsArray at: 60 put: #trapTripped. "Disable hot spot detection (to load the Scorch code)" Smalltalk specialObjectsArray at: 59 put: nil. "Recompile the fetch mourner primitive which has strange side-effect with alternate bytecode set and closures" WeakArray class compile: 'primitiveFetchMourner ^ nil' classified: #patch. "Enable FullBlockClosure and alternate bytecode set" CompilationContext bytecodeBackend: OpalEncoderForSistaV1. CompilationContext usesFullBlockClosure: true. OpalCompiler recompileAll. If I only execute the last three lines it is crashing as well but at a different point in the VM? (lldb) bt * thread #1: tid = 0x5636d2, 0xa165e496 libsystem_kernel.dylib`__pthread_kill + 10, queue = 'com.apple.main-thread', stop reason = signal SIGABRT * frame #0: 0xa165e496 libsystem_kernel.dylib`__pthread_kill + 10 frame #1: 0xa1744c63 libsystem_pthread.dylib`pthread_kill + 90 frame #2: 0xa15bea34 libsystem_c.dylib`abort + 141 frame #3: 0x00087128 Pharo`error + 55 frame #4: 0x000132e6 Pharo`lookupMethodInClass + 601 frame #5: 0x000085c1 Pharo`interpret + 25756 frame #6: 0x00011b9a Pharo`enterSmalltalkExecutiveImplementation + 135 frame #7: 0x000023ab Pharo`interpret + 646 frame #8: 0x000889d9 Pharo`-[sqSqueakMainApplication runSqueak] + 476 frame #9: 0x95ac4a1b Foundation`__NSFirePerformWithOrder + 419 frame #10: 0x942811fe CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 30 frame #11: 0x94281157 CoreFoundation`__CFRunLoopDoObservers + 391 frame #12: 0x942614a2 CoreFoundation`__CFRunLoopRun + 1058 frame #13: 0x94260e1a CoreFoundation`CFRunLoopRunSpecific + 506 frame #14: 0x94260c0b CoreFoundation`CFRunLoopRunInMode + 123 frame #15: 0x93954396 HIToolbox`RunCurrentEventLoopInMode + 268 frame #16: 0x93954057 HIToolbox`ReceiveNextEventCommon + 195 frame #17: 0x93953f7b HIToolbox`_BlockUntilNextEventMatchingListInModeWithFilter + 83 frame #18: 0x91f86015 AppKit`_DPSNextEvent + 1227 frame #19: 0x926ebbbb AppKit`-[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 1742 frame #20: 0x926eb4e5 AppKit`-[NSApplication(NSEvent) nextEventMatchingMask:untilDate:inMode:dequeue:] + 132 frame #21: 0x91f7acb6 AppKit`-[NSApplication run] + 943 frame #22: 0x91f47d1e AppKit`NSApplicationMain + 1368 frame #23: 0xa152f395 libdyld.dylib`start + 1 (lldb) p (int) activeProcess() (int) $0 = 115378352 (lldb) p/x (int) activeProcess() (int) $1 = 0x06e088b0 (lldb) p (void) printAllStacks() Process 0x6e088b0 priority 40 0xbfffc124 I FileReference(AbstractFileReference)>writeStreamDo: 0x9a303d8: a(n) 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Re: [Pharo-dev] Pharo7 and full block closures
by ClÃ©ment Bera Sept. 22, 2017

Sept. 22, 2017

Yeah we may need to do that as a transition to move them to production. Let's do that the first week of october Pablo On Sep 22, 2017 18:59, "tesonep(a)gmail.com" <tesonep(a)gmail.com> wrote: Hi ClÃ©ment, If you need help with the CI, I can also help you. We can create it as a another parallel stage in the PR validation. So once it is stable we can detect asap changes that break it. Cheers, On 22 Sep 2017 18:45, "ClÃ©ment Bera" <bera.clement(a)gmail.com> wrote: Well we need to use them but the integration process is difficult to deal with: we need to change the bootstrap to cross compile to the other bytecode set. I need to have some time to focus on it amd I need the help of someone understanding the bootstrap like Guille On Sep 22, 2017 18:31, "Stephane Ducasse" <stepharo.self(a)gmail.com> wrote: > Hi clement > > let us know how we can help because he all want the new closures. > > Stef > > On Fri, Sep 22, 2017 at 11:11 AM, ClÃ©ment Bera <bera.clement(a)gmail.com> > wrote: > > I totally agree with you on this. > > > > For a while I had a CI job that was trying to execute Sista on the latest > > version of Pharo and VM, and sent me a mail when something had gone > wrong. I > > disabled it when there was problems on the CI, I will make it work again. > > This way I am notified and I can update the Sista code as Pharo 7 is > > developed. That helps a lot. > > > > On the Pharo CI the time to run tests matters hence I will try to find > > another solution to test full block and the other bytecode set. I did > not do > > that because I hope I can change Pharo to use full block by default soon, > > but since they're broken... > > > > Regards > > > > > > > > On Fri, Sep 22, 2017 at 10:58 AM, Holger Freyther <holger(a)freyther.de> > > wrote: > >> > >> > >> > On 22. Sep 2017, at 13:33, ClÃ©ment Bera <bera.clement(a)gmail.com> > wrote: > >> > >> > >> Hi Clement, > >> > >> > >> > Sista will work for the release of Pharo 7 as it did for Pharo 6 and > 6.1 > >> > but it won't work every day during the alpha of Pharo 7 and no sane > >> > framework developer can guarantee that. Sista does not work currently > in > >> > Pharo 7 due to some changes breaking the full block closures, I am > going to > >> > fix it but even then in the incoming months there is a high chance > that > >> > another change in Pharo 7 breaks it again, so I would never recommend > to use > >> > it with the alpha. > >> > >> > >> thank you for your response. I didn't expect it to work (after all you > >> label it "Alpha" and I ran into issues already) but my intention for the > >> mail was a bit different. Let me try to briefly explain my motivation. > In my > >> experience: > >> > >> (1) Software not executed stops to work (or never "worked") > >> (2) The earlier breakage is detected the less expensive it is to fix. > >> > >> My assumption is that Opal is part of Pharo and that we look at a > >> regression of the Opal compiler and/or how it interacts with the rest > of the > >> image. As it might be easier to understand/fix it now than later I > brought > >> it up. From my point of view I wonder if we want to add ~50s to the CI > >> process to execute: > >> > >> CompilationContext bytecodeBackend: OpalEncoderForSistaV1. > >> CompilationContext usesFullBlockClosure: true. > >> OpalCompiler recompileAll. > >> > >> > >> Is there any value in doing so? > >> > >> > >> cheers > >> > >> holger > >> > >> > >> PS > >> > >> (2) The intuitive explanation is that the cost of analysis is a lot > lower > >> the earlier the problem is detected. There are fewer potential changes > that > >> lead to the breakage and the people involved will remember what/why > they did > >> reducing the cost of fixing. Ideally things are found to be broken and > fixed > >> before integration. > >> > >> Maybe an analogy is old-school aviation navigation.. the earlier a > mistake > >> is found in navigation the closer to the original course... > > > > > >

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[Pharo 7.0-dev] Build #149: 20442-open-the-welcome-window. case 20442
by ci-pharo-ci-jenkins2＠inria.fr Sept. 22, 2017

Sept. 22, 2017

There is a new Pharo build available! The status of the build #149 was: SUCCESS. The Pull Request #297 was integrated: "20442-open-the-welcome-window. case 20442" Pull request url: https://github.com/pharo-project/pharo/pull/297 Issue Url: https://pharo.fogbugz.com/f/cases/20442 Build Url: https://ci.inria.fr/pharo-ci-jenkins2/job/Test%20pending%20pull%20request%2…

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[Pharo 7.0-dev] Build #150: 20462-An-error-in-the-Tests-never-break-the-build
by ci-pharo-ci-jenkins2＠inria.fr Sept. 22, 2017

Sept. 22, 2017

There is a new Pharo build available! The status of the build #150 was: FAILURE. The Pull Request #308 was integrated: "20462-An-error-in-the-Tests-never-break-the-build" Pull request url: https://github.com/pharo-project/pharo/pull/308 Issue Url: https://pharo.fogbugz.com/f/cases/20462 Build Url: https://ci.inria.fr/pharo-ci-jenkins2/job/Test%20pending%20pull%20request%2…

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Iceberg Default Subdirectory Setting?
by Sean P. DeNigris Sept. 22, 2017

Sept. 22, 2017

I always put my packages in gitroot/repository per instructions I read when I was starting with FT (Dale's IIRC). It's a (minor) drag to type that every time I add a local git repo. How would y'all feel about a setting? ----- Cheers, Sean -- Sent from: http://forum.world.st/Pharo-Smalltalk-Developers-f1294837.html

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How to get started writing a little booklet on Pharo?
by Stephane Ducasse Sept. 21, 2017

Sept. 21, 2017

- Create a repository xxx on github - git clone xxx - cd xxx wget https://raw.githubusercontent.com/pillar-markup/pillar/master/download.sh chmod +x download.sh ./download.sh ./pillar archetype book make spiral You can also run the texlive distribution in docker. https://github.com/cdlm/docker-texlive Stef

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Call to read and give feedback on Booklet-Mocking
by Stephane Ducasse Sept. 21, 2017

Sept. 21, 2017

HI guys we should increase our culture around documentation. https://github.com/SquareBracketAssociates/Booklet-Mocking Please read the booklet. Attila told me that he was planning to rewrite the chapter on baby mock. Now each time you commit on github the pdf is generated. Stef

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[Pharo 7.0-dev] Build #148: 20440-integrate-ReferenceFinder
by ci-pharo-ci-jenkins2＠inria.fr Sept. 21, 2017

Sept. 21, 2017

There is a new Pharo build available! The status of the build #148 was: SUCCESS. The Pull Request #296 was integrated: "20440-integrate-ReferenceFinder" Pull request url: https://github.com/pharo-project/pharo/pull/296 Issue Url: https://pharo.fogbugz.com/f/cases/20440 Build Url: https://ci.inria.fr/pharo-ci-jenkins2/job/Test%20pending%20pull%20request%2…

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[Pharo 7.0-dev] Build #147: 20440-integrate-ReferenceFinder
by ci-pharo-ci-jenkins2＠inria.fr Sept. 21, 2017

Sept. 21, 2017

There is a new Pharo build available! The status of the build #147 was: FAILURE. The Pull Request #296 was integrated: "20440-integrate-ReferenceFinder" Pull request url: https://github.com/pharo-project/pharo/pull/296 Issue Url: https://pharo.fogbugz.com/f/cases/20440 Build Url: https://ci.inria.fr/pharo-ci-jenkins2/job/Test%20pending%20pull%20request%2…

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