+estaab suggested by tansell.

Tim mentioned this has failed on a bunch of bots flakily (don't know which though...).

It happened again: https://build.chromium.org/p/chromium/builders/Mac/builds/21274

The blame range is a single patch that adds a comment.

Ack.

I don't know how to fix it but tansell@ mentioned there's a flag to make this not an error. Maybe we can do that in the short term.

Bumping up to pri 1 since we've seen two tree closers in one day.

Sorry, I missed this. This falls in a grey area between infra and dev tools so perhaps Andy or Dirk can help figure out next steps.

Sheriff here: I could not interpret this error and it took me a while to even find that section in the logs. Is this an infra issue? Any suggestions on how to better direct it?

I'd consider this to be a dev-side problem. Most likely when this happens there are missing build dependencies. We have this set to be checked and be a build error on many but not all builders. 

I believe there may be a known case at the moment where this is still broken on Android; if you're seeing this elsewhere at the moment (e.g., on Mac like the subject says), that'd be a new bug.

This is definitely happening on mac every now and then. It doesn't seem to be reproducible (IE rerunning the same change doesn't cause the same failure).

This is still happening recently and frequently.

https://build.chromium.org/p/chromium/builders/Mac?numbuilds=200

The last one is https://build.chromium.org/p/chromium/builders/Mac/builds/23536

Adding Safebrowsing component to have this investigated by SafeBrowsing folks as the log is listing files with "safe_browsing" in their file names.

+cc rhalavati@ could this be related to  issue 690296  ?

Don't think so. There is no trace of cloud_policy.proto there and ninja explain says this file doesn't exist which doesn't seem related to that proto: test_data/chrome/safe_browsing_dmg/hfsx_case_sensitive.img 

This does happen from time to time on Mac builder:
https://build.chromium.org/p/chromium/builders/Mac


ninja explain: output test_data/chrome/safe_browsing_dmg/hfsx_case_sensitive.img doesn't exist
ninja explain: test_data/chrome/safe_browsing_dmg/dmg_UDBZ_GPTSPUD.dmg is dirty
ninja explain: test_data/chrome/safe_browsing_dmg/dmg_UDBZ_NONE.dmg is dirty
ninja explain: test_data/chrome/safe_browsing_dmg/dmg_UDBZ_SPUD.dmg is dirty
ninja explain: test_data/chrome/safe_browsing_dmg/dmg_UDCO_GPTSPUD.dmg is dirty
ninja explain: test_data/chrome/safe_browsing_dmg/dmg_UDCO_NONE.dmg is dirty
ninja explain: test_data/chrome/safe_browsing_dmg/dmg_UDCO_SPUD.dmg is dirty
ninja explain: test_data/chrome/safe_browsing_dmg/dmg_UDRO_GPTSPUD.dmg is dirty
ninja explain: test_data/chrome/safe_browsing_dmg/dmg_UDRO_NONE.dmg is dirty
ninja explain: test_data/chrome/safe_browsing_dmg/dmg_UDRO_SPUD.dmg is dirty
ninja explain: test_data/chrome/safe_browsing_dmg/dmg_UDRW_GPTSPUD.dmg is dirty
ninja explain: test_data/chrome/safe_browsing_dmg/dmg_UDRW_NONE.dmg is dirty
ninja explain: test_data/chrome/safe_browsing_dmg/dmg_UDRW_SPUD.dmg is dirty
ninja explain: test_data/chrome/safe_browsing_dmg/dmg_UDSP_GPTSPUD.sparseimage is dirty
ninja explain: test_data/chrome/safe_browsing_dmg/dmg_UDSP_NONE.sparseimage is dirty
ninja explain: test_data/chrome/safe_browsing_dmg/dmg_UDSP_SPUD.sparseimage is dirty
ninja explain: test_data/chrome/safe_browsing_dmg/dmg_UDTO_GPTSPUD.cdr is dirty
ninja explain: test_data/chrome/safe_browsing_dmg/dmg_UDTO_NONE.cdr is dirty
ninja explain: test_data/chrome/safe_browsing_dmg/dmg_UDTO_SPUD.cdr is dirty
ninja explain: test_data/chrome/safe_browsing_dmg/dmg_UDZO_GPTSPUD.dmg is dirty
ninja explain: test_data/chrome/safe_browsing_dmg/dmg_UDZO_NONE.dmg is dirty
ninja explain: test_data/chrome/safe_browsing_dmg/dmg_UDZO_SPUD.dmg is dirty
ninja explain: test_data/chrome/safe_browsing_dmg/dmg_UFBI_GPTSPUD.dmg is dirty
ninja explain: test_data/chrome/safe_browsing_dmg/dmg_UFBI_NONE.dmg is dirty
ninja explain: test_data/chrome/safe_browsing_dmg/dmg_UFBI_SPUD.dmg is dirty
ninja explain: test_data/chrome/safe_browsing_dmg/hfs_plus.img is dirty
ninja explain: test_data/chrome/safe_browsing_dmg/hfsx_case_sensitive.img is dirty
ninja explain: test_data/chrome/safe_browsing_dmg/mach_o_in_dmg.dmg is dirty
ninja explain: obj/chrome/test/mac_safe_browsing_test_data.stamp is dirty
ninja explain: obj/chrome/test/mac_safe_browsing_test_data.stamp is dirty
@@@STEP_TEXT@This should have been a no-op, but it wasn't.@@@
@@@STEP_FAILURE@@@

I don't think this is necessarily mac specific? I just had a similar random failure on a windows build - tryserver.chromium.win/win_chromium_rel_ng/382022

https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Ftryserver.chromium.win%2Fwin_chromium_rel_ng%2F382022%2F%2B%2Frecipes%2Fsteps%2Fcompile__with_patch__confirm_no-op%2F0%2Fstdout

---------------------

ninja explain: output obj/chrome/browser/test_support_ui/password_manager_test_base.obj older than most recent input gen/third_party/WebKit/public/web/window_features.mojom.h (508747538 vs 508747567)
ninja explain: obj/chrome/browser/test_support_ui/password_manager_test_base.obj is dirty
ninja explain: output obj/chrome/browser/test_support_ui/web_ui_test_handler.obj older than most recent input gen/third_party/WebKit/public/web/window_features.mojom.h (508747538 vs 508747567)
ninja explain: obj/chrome/browser/test_support_ui/web_ui_test_handler.obj is dirty
ninja explain: obj/chrome/browser/test_support_ui.lib is dirty
ninja explain: browser_tests.exe is dirty
ninja explain: browser_tests.exe is dirty
ninja explain: obj/chrome/test/browser_tests_run.stamp is dirty
ninja explain: obj/chrome/browser/test_support_ui.lib is dirty
ninja explain: chrome_app_unittests.exe is dirty
ninja explain: chrome_app_unittests.exe is dirty
ninja explain: obj/chrome/test/chrome_app_unittests_run.stamp is dirty
ninja explain: obj/chrome/browser/test_support_ui.lib is dirty
ninja explain: interactive_ui_tests.exe is dirty
ninja explain: interactive_ui_tests.exe is dirty
ninja explain: obj/chrome/test/interactive_ui_tests_run.stamp is dirty
ninja explain: obj/chrome/browser/test_support_ui.lib is dirty
ninja explain: sync_integration_tests.exe is dirty
ninja explain: sync_integration_tests.exe is dirty
ninja explain: obj/chrome/test/sync_integration_tests_run.stamp is dirty
ninja explain: browser_tests.exe is dirty
ninja explain: obj/chrome/test/tab_capture_end2end_tests_run.stamp is dirty
ninja explain: obj/chrome/browser/test_support_ui.lib is dirty
ninja explain: unit_tests.exe is dirty
ninja explain: unit_tests.exe is dirty
ninja explain: obj/chrome/test/unit_tests_run.stamp is dirty
---------------------------

Here is a similar no-op failure on a Linux builder...

https://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_rel_ng/builds/391551/steps/compile%20%28with%20patch%29%20confirm%20no-op/logs/stdio
------------------------
ninja explain: output obj/pdf/pdf_unittests_run.stamp older than most recent input pdf_unittests (1487230486 vs 1487230487)
ninja explain: obj/pdf/pdf_unittests_run.stamp is dirty
ninja explain: obj/pdf/pdf_unittests_run.stamp is dirty
@@@STEP_TEXT@This should have been a no-op, but it wasn't.@@@
@@@STEP_FAILURE@@@
------------------------

The initial report is a dupe of  issue 602169  and just means macOS is in a bad state and the bot should be rebooted.

But there are a bunch of other unrelated issues reported here, so I'm not sure how useful this bug is.

It seems like this problem got fixed somehow and is not happening anymore since everything on https://build.chromium.org/p/chromium/builders/Mac?numbuilds=200 is green.