+smut

Hey Sana, any idea why this is happening?

No idea. +cc iOS sheriffs.

(explicitly assigning for sheriff followup)

ios_chrome_unittests is not flaky on downstream bot, so this is infrastructure problem rather than a problem with app code. Sana, do you know who would the the right person to troubleshoot this?

No. I have no idea where to begin. I have seen app launch flake downstream on simulator, although it's somewhat rare. I have no idea why the app fails to launch sometimes or what it means when it says:
iossim: ERROR: Simulator failed to start: "The operation couldn’t be completed. (Cocoa error -102.)" (NSCocoaErrorDomain:-102)

Ok. We should figure out some options here then.

1) The error recommends one files a bug with apple - has anyone done that yet?

2) It looks like we're already doing one retry and it's failing the same way both times, so adding another probably won't help.

3) There seems to be agreement that we don't have enough information. What information would it take to understand what's happening or to reproduce the error?



Here's the stdio of the failing step for future reference:

@@@STEP_CURSOR@ios_chrome_unittests (iPhone 5s iOS 9.0)@@@
@@@STEP_STARTED@@@
/b/build/scripts/slave/ios/run.py --app /b/build/slave/ios-simulator-gn/build/src/out/Debug-iphonesimulator/ios_chrome_unittests.app --json_file /tmp/tmppjRxX8.json --iossim /b/build/slave/ios-simulator-gn/build/src/out/Debug-iphonesimulator/iossim --platform 'iPhone 5s' --version 9.0
in dir /b/build/slave/ios-simulator-gn/build:
 cmd: ['/b/build/scripts/slave/ios/run.py', '--app', '/b/build/slave/ios-simulator-gn/build/src/out/Debug-iphonesimulator/ios_chrome_unittests.app', '--json_file', '/tmp/tmppjRxX8.json', '--iossim', '/b/build/slave/ios-simulator-gn/build/src/out/Debug-iphonesimulator/iossim', '--platform', 'iPhone 5s', '--version', '9.0']
 name: ios_chrome_unittests (iPhone 5s iOS 9.0)
 step_test_data: test_results(...)
full environment:
 AWS_CREDENTIAL_FILE: /b/build/site_config/.boto
 BOTO_CONFIG: /b/build/site_config/.boto
 BUILDBOT_BLAMELIST: [u'eugenebut@chromium.org']
 BUILDBOT_BRANCH: 
 BUILDBOT_BUILDBOTURL: http://build.chromium.org/p/tryserver.chromium.mac/
 BUILDBOT_BUILDERNAME: ios-simulator-gn
 BUILDBOT_BUILDNUMBER: 15998
 BUILDBOT_CLOBBER: 
 BUILDBOT_GOT_REVISION: None
 BUILDBOT_MASTERNAME: tryserver.chromium.mac
 BUILDBOT_REVISION: 
 BUILDBOT_SCHEDULER: None
 BUILDBOT_SLAVENAME: vm898-m4
 CHROME_HEADLESS: 1
 GIT_USER_AGENT: darwin git/2.7.4 vm898-m4.golo.chromium.org
 HOME: /Users/chrome-bot
 LOGNAME: chrome-bot
 PAGER: cat
 PATH: /Users/chrome-bot/slavebin:/b/depot_tools:/usr/local/git/bin:/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin
 PWD: /b/build/slave/ios-simulator-gn/build
 PYTHONPATH: /b/build/site_config:/b/build/scripts:/b/build/scripts/release:/b/build/third_party:/b/build/third_party/requests_2_10_0:/b/build_internal/site_config:/b/build_internal/symsrc:/b/build/slave:/b/build/third_party/buildbot_slave_8_4:/b/build/third_party/twisted_10_2:
 SHELL: /bin/bash
 SSH_AUTH_SOCK: /private/tmp/com.apple.launchd.PvZyfi4E7w/Listeners
 USER: chrome-bot

/usr/libexec/PlistBuddy -c Print:CFBundleIdentifier /b/build/slave/ios-simulator-gn/build/src/out/Debug-iphonesimulator/ios_chrome_unittests.app/Info.plist
cwd: /b/build/slave/ios-simulator-gn/build

com.google.gtest.ios_chrome_unittests


pkill -9 -x iPhone Simulator iOS Simulator Simulator
cwd: /b/build/slave/ios-simulator-gn/build



/b/build/slave/ios-simulator-gn/build/src/out/Debug-iphonesimulator/iossim -d iPhone 5s -s 9.0 -t 120 -u /tmp/tmptLLEgs /b/build/slave/ios-simulator-gn/build/src/out/Debug-iphonesimulator/ios_chrome_unittests.app
cwd: /b/build/slave/ios-simulator-gn/build
2016-06-03 08:50:51.727 iossim[6288:13374] [MT] DVTAssertions: Warning in /Library/Caches/com.apple.xbs/Sources/DVTFrameworks/DVTFrameworks-8201/DVTFoundation/PlugInArchitecture/PlugInManager/DVTPlugInManager.m:257
Details:  Requested but did not find extension point with identifier Xcode.DVTFoundation.DevicePlatformMapping
Object:   <DVTPlugInManager: 0x7feaada20b00>
Method:   -extensionPointWithIdentifier:
Thread:   <NSThread: 0x7feaab40b760>{number = 1, name = main}
Please file a bug at http://bugreport.apple.com with this warning message and any useful information you can provide.
iossim: ERROR: Simulator failed to start: "The operation couldn’t be completed. (Cocoa error -102.)" (NSCocoaErrorDomain:-102)
Supported device/SDK combinations:
  -d 'iossim - iPhone 5s ' -s '9.0'
/b/build/slave/ios-simulator-gn/build/src/out/Debug-iphonesimulator/iossim returned 4

ios_chrome_unittests appears to have crashed on startup. Retrying...


pkill -9 -x iPhone Simulator iOS Simulator Simulator
cwd: /b/build/slave/ios-simulator-gn/build



/b/build/slave/ios-simulator-gn/build/src/out/Debug-iphonesimulator/iossim -d iPhone 5s -s 9.0 -t 120 -u /tmp/tmpsvclxW /b/build/slave/ios-simulator-gn/build/src/out/Debug-iphonesimulator/ios_chrome_unittests.app
cwd: /b/build/slave/ios-simulator-gn/build
2016-06-03 08:51:04.829 iossim[6357:14359] [MT] DVTAssertions: Warning in /Library/Caches/com.apple.xbs/Sources/DVTFrameworks/DVTFrameworks-8201/DVTFoundation/PlugInArchitecture/PlugInManager/DVTPlugInManager.m:257
Details:  Requested but did not find extension point with identifier Xcode.DVTFoundation.DevicePlatformMapping
Object:   <DVTPlugInManager: 0x7fcfe9414b60>
Method:   -extensionPointWithIdentifier:
Thread:   <NSThread: 0x7fcfe940b760>{number = 1, name = main}
Please file a bug at http://bugreport.apple.com with this warning message and any useful information you can provide.
iossim: ERROR: Simulator failed to start: "The operation couldn’t be completed. (Cocoa error -102.)" (NSCocoaErrorDomain:-102)
Supported device/SDK combinations:
  -d 'iossim - iPhone 5s ' -s '9.0'
/b/build/slave/ios-simulator-gn/build/src/out/Debug-iphonesimulator/iossim returned 4

pkill -9 -x iPhone Simulator iOS Simulator Simulator
cwd: /b/build/slave/ios-simulator-gn/build



step returned non-zero exit code: 2
@@@STEP_TEXT@AppLaunchError@@@
@@@STEP_LOG_LINE@json.output@{@@@
@@@STEP_LOG_LINE@json.output@  "links": {}, @@@
@@@STEP_LOG_LINE@json.output@  "logs": {}, @@@
@@@STEP_LOG_LINE@json.output@  "step_text": "AppLaunchError"@@@
@@@STEP_LOG_LINE@json.output@}@@@
@@@STEP_LOG_END@json.output@@@
@@@STEP_EXCEPTION@@@

Did we change anything in the way how we launch the Simulator? Should we try reinstalling Xcode on this specific machine?

Filing radar against Apple unlikely will be helpful, though there is some value in doing that...

We haven't changed anything in awhile.

Maybe there is somethings wrong with one specific machine?

According to the original report, it happened on three different VMs:
https://build.chromium.org/p/tryserver.chromium.mac/builders/ios-simulator-gn/builds/15998
https://build.chromium.org/p/tryserver.chromium.mac/builders/ios-simulator-gn/builds/15930
https://build.chromium.org/p/tryserver.chromium.mac/builders/ios-simulator-gn/builds/15585

+rohitrao who owns iossim. Rohit, does this error look familiar to you at all?

Found in the OWNERS file here:
https://chromium.googlesource.com/chromium/src/+/master/testing/iossim/OWNERS

(please re-add trooper if something urgent comes up that the trooper needs to address)

Marking WontFix since it has gone away? Please re-open if that is not the case.