1695570 - Intermittent TEST-UNEXPECTED-TIMEOUT | /clear-site-data/navigation.https.html | Clear datatypes on navigation: - Test timed out

Status: RESOLVED INCOMPLETE

(Core :: DOM: Security, defect, P5)

Description

[Treeherder Bug Filer]

Filed by: abutkovits [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer?job_id=331570147&repo=autoland
Full log: https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/Hwk2IJLiTzGKgqfgFyvxJA/runs/0/artifacts/public/logs/live_backing.log

---

[task 2021-03-01T05:31:36.669Z] 05:31:36     INFO - TEST-START | /clear-site-data/navigation.https.html
[task 2021-03-01T05:31:36.672Z] 05:31:36     INFO - Closing window 6442450945
[task 2021-03-01T05:31:47.603Z] 05:31:47     INFO - 
[task 2021-03-01T05:31:47.603Z] 05:31:47     INFO - TEST-UNEXPECTED-TIMEOUT | /clear-site-data/navigation.https.html | Clear datatypes on navigation:  - Test timed out
[task 2021-03-01T05:31:47.603Z] 05:31:47     INFO - 
[task 2021-03-01T05:31:47.603Z] 05:31:47     INFO - TEST-UNEXPECTED-NOTRUN | /clear-site-data/navigation.https.html | Clear datatypes on navigation: cookies - expected PASS
[task 2021-03-01T05:31:47.604Z] 05:31:47     INFO - 
[task 2021-03-01T05:31:47.604Z] 05:31:47     INFO - TEST-UNEXPECTED-NOTRUN | /clear-site-data/navigation.https.html | Clear datatypes on navigation: storage - expected PASS
[task 2021-03-01T05:31:47.605Z] 05:31:47     INFO - 
[task 2021-03-01T05:31:47.605Z] 05:31:47     INFO - TEST-UNEXPECTED-NOTRUN | /clear-site-data/navigation.https.html | Clear datatypes on navigation: cookies, storage - expected PASS```

Comment 1

[Intermittent Failures Robot]

1 failures in 3683 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 1

Platform and build breakdown:

• linux1804-64-shippable-qr: 1
  • opt: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1695570&startday=2021-03-01&endday=2021-03-07&tree=all

Comment 2

[BugBot [:suhaib / :marco/ :calixte]]

https://wiki.mozilla.org/Bug_Triage#Intermittent_Test_Failure_Cleanup
For more information, please visit auto_nag documentation.

Comment 3

[Intermittent Failures Robot]

1 failures in 2899 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• mozilla-beta: 1

Platform and build breakdown:

• windows10-64-2004-shippable-qr: 1
  • opt: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1695570&startday=2021-08-16&endday=2021-08-22&tree=all

Comment 4

[Andreea Pavel [:apavel]]

Recent failure log: https://treeherder.mozilla.org/logviewer?job_id=349566866&repo=mozilla-beta&lineNumber=2086

[task 2021-08-25T20:26:06.389Z] 20:26:06     INFO - TEST-START | /content-security-policy/blob/blob-urls-match-blob.sub.html
[task 2021-08-25T20:26:06.473Z] 20:26:06     INFO - .
[task 2021-08-25T20:26:06.473Z] 20:26:06     INFO - TEST-OK | /content-security-policy/blob/blob-urls-match-blob.sub.html | took 84ms
[task 2021-08-25T20:26:06.492Z] 20:26:06     INFO - Restarting browser for new test group
[task 2021-08-25T20:26:06.495Z] 20:26:06     INFO - PID 3184 | 1629923166494	Marionette	INFO	Stopped listening on port 50001
[task 2021-08-25T20:26:06.510Z] 20:26:06     INFO - PID 3184 | JavaScript error: resource://activity-stream/lib/ActivityStreamPrefs.jsm, line 27: NS_ERROR_ILLEGAL_VALUE: Component returned failure code: 0x80070057 (NS_ERROR_ILLEGAL_VALUE) [nsIPrefBranch.removeObserver]
[task 2021-08-25T20:26:06.542Z] 20:26:06     INFO - PID 3184 | JavaScript error: resource:///modules/Interactions.jsm, line 230: NS_ERROR_FAILURE: Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIUserIdleService.removeIdleObserver]
[task 2021-08-25T20:26:06.580Z] 20:26:06     INFO - PID 3184 | [Parent 8152, IPC I/O Parent] WARNING: file /builds/worker/checkouts/gecko/ipc/chromium/src/base/process_util_win.cc:167
[task 2021-08-25T20:26:07.461Z] 20:26:07     INFO - PID 3184 | JavaScript error: resource://gre/modules/JSONFile.jsm, line 138: AbortError: IOUtils.profileBeforeChange getter: IOUtils: profileBeforeChange phase has already finished
[task 2021-08-25T20:26:10.031Z] 20:26:10     INFO - PID 3184 | JavaScript error: resource://activity-stream/lib/PlacesFeed.jsm, line 178: NS_ERROR_UNEXPECTED: Component returned failure code: 0x8000ffff (NS_ERROR_UNEXPECTED) [nsINavBookmarksService.addObserver]
[task 2021-08-25T20:26:10.919Z] 20:26:10     INFO - PID 3184 | console.log: "RemoteSettingsWorker error: Error: Can't import when we've started shutting down."
[task 2021-08-25T20:26:11.405Z] 20:26:11     INFO - PID 3184 | console.log: "RemoteSettingsWorker error: Error: Can't import when we've started shutting down."
[task 2021-08-25T20:26:11.409Z] 20:26:11     INFO - PID 3184 | console.log: "RemoteSettingsWorker error: Error: Can't import when we've started shutting down."
[task 2021-08-25T20:26:11.411Z] 20:26:11     INFO - PID 3184 | console.log: "RemoteSettingsWorker error: Error: Can't import when we've started shutting down."
[task 2021-08-25T20:26:11.413Z] 20:26:11     INFO - PID 3184 | console.log: "RemoteSettingsWorker error: Error: Can't import when we've started shutting down."
[task 2021-08-25T20:26:11.415Z] 20:26:11     INFO - PID 3184 | console.log: "RemoteSettingsWorker error: Error: Can't import when we've started shutting down."
[task 2021-08-25T20:26:11.428Z] 20:26:11     INFO - PID 3184 | console.error: "Could not load engine [e-mail]: [Exception... \"AddonManager is not initialized\"  nsresult: \"0xc1f30001 (NS_ERROR_NOT_INITIALIZED)\"  location: \"JS frame :: resource://gre/modules/AddonManager.jsm :: installBuiltinAddon :: line 2526\"  data: no]"
[task 2021-08-25T20:26:11.429Z] 20:26:11     INFO - PID 3184 | console.error: "Could not load engine [e-mail]: [Exception... \"AddonManager is not initialized\"  nsresult: \"0xc1f30001 (NS_ERROR_NOT_INITIALIZED)\"  location: \"JS frame :: resource://gre/modules/AddonManager.jsm :: installBuiltinAddon :: line 2526\"  data: no]"
[task 2021-08-25T20:26:11.430Z] 20:26:11     INFO - PID 3184 | console.error: "Could not load engine [e-mail]: [Exception... \"AddonManager is not initialized\"  nsresult: \"0xc1f30001 (NS_ERROR_NOT_INITIALIZED)\"  location: \"JS frame :: resource://gre/modules/AddonManager.jsm :: installBuiltinAddon :: line 2526\"  data: no]"
[task 2021-08-25T20:26:11.431Z] 20:26:11     INFO - PID 3184 | console.error: "Could not load engine [e-mail]: [Exception... \"AddonManager is not initialized\"  nsresult: \"0xc1f30001 (NS_ERROR_NOT_INITIALIZED)\"  location: \"JS frame :: resource://gre/modules/AddonManager.jsm :: installBuiltinAddon :: line 2526\"  data: no]"
[task 2021-08-25T20:26:11.432Z] 20:26:11     INFO - PID 3184 | console.error: "Could not load engine [e-mail]: [Exception... \"AddonManager is not initialized\"  nsresult: \"0xc1f30001 (NS_ERROR_NOT_INITIALIZED)\"  location: \"JS frame :: resource://gre/modules/AddonManager.jsm :: installBuiltinAddon :: line 2526\"  data: no]"
[task 2021-08-25T20:26:11.432Z] 20:26:11     INFO - PID 3184 | console.error: "Could not load engine [e-mail]: [Exception... \"AddonManager is not initialized\"  nsresult: \"0xc1f30001 (NS_ERROR_NOT_INITIALIZED)\"  location: \"JS frame :: resource://gre/modules/AddonManager.jsm :: installBuiltinAddon :: line 2526\"  data: no]"
[task 2021-08-25T20:26:11.433Z] 20:26:11     INFO - PID 3184 | console.warn: SearchService: "_init: abandoning init due to shutting down"
[task 2021-08-25T20:26:11.434Z] 20:26:11     INFO - PID 3184 | JavaScript error: , line 0: uncaught exception: 2147500036
[task 2021-08-25T20:26:11.434Z] 20:26:11     INFO - PID 3184 | JavaScript error: , line 0: uncaught exception: 2147500036
[task 2021-08-25T20:26:11.435Z] 20:26:11     INFO - PID 3184 | JavaScript error: , line 0: uncaught exception: 2147500036
[task 2021-08-25T20:26:11.435Z] 20:26:11     INFO - PID 3184 | JavaScript error: , line 0: uncaught exception: 2147500036
[task 2021-08-25T20:26:11.435Z] 20:26:11     INFO - PID 3184 | JavaScript error: , line 0: uncaught exception: 2147500036
[task 2021-08-25T20:26:11.436Z] 20:26:11     INFO - PID 3184 | JavaScript error: , line 0: uncaught exception: 2147500036
[task 2021-08-25T20:26:11.436Z] 20:26:11     INFO - PID 3184 | JavaScript error: , line 0: uncaught exception: 2147500036
[task 2021-08-25T20:26:11.437Z] 20:26:11     INFO - PID 3184 | JavaScript error: , line 0: uncaught exception: 2147500036
[task 2021-08-25T20:26:11.437Z] 20:26:11     INFO - PID 3184 | JavaScript error: , line 0: uncaught exception: 2147500036
[task 2021-08-25T20:26:11.438Z] 20:26:11     INFO - PID 3184 | JavaScript error: , line 0: uncaught exception: 2147500036
[task 2021-08-25T20:26:11.438Z] 20:26:11     INFO - PID 3184 | JavaScript error: , line 0: uncaught exception: 2147500036
[task 2021-08-25T20:26:11.439Z] 20:26:11     INFO - PID 3184 | JavaScript error: , line 0: uncaught exception: 2147500036
[task 2021-08-25T20:26:11.440Z] 20:26:11     INFO - PID 3184 | JavaScript error: , line 0: uncaught exception: 2147500036
[task 2021-08-25T20:26:11.505Z] 20:26:11     INFO - 
[task 2021-08-25T20:26:11.516Z] 20:26:11     INFO - TEST-PASS | /clear-site-data/navigation.https.html | Clear datatypes on navigation:  
[task 2021-08-25T20:26:11.516Z] 20:26:11     INFO - TEST-PASS | /clear-site-data/navigation.https.html | Clear datatypes on navigation: cookies 
[task 2021-08-25T20:26:11.516Z] 20:26:11     INFO - TEST-PASS | /clear-site-data/navigation.https.html | Clear datatypes on navigation: storage 
[task 2021-08-25T20:26:11.516Z] 20:26:11     INFO - TEST-UNEXPECTED-TIMEOUT | /clear-site-data/navigation.https.html | Clear datatypes on navigation: cookies, storage - Test timed out
[task 2021-08-25T20:26:11.516Z] 20:26:11     INFO - TEST-UNEXPECTED-TIMEOUT | /clear-site-data/navigation.https.html | expected OK
[task 2021-08-25T20:26:11.517Z] 20:26:11     INFO - TEST-INFO took 10283ms
[task 2021-08-25T20:26:11.518Z] 20:26:11     INFO - PID 5388 | 1629923171516	Marionette	INFO	Stopped listening on port 49944
[task 2021-08-25T20:26:11.558Z] 20:26:11     INFO - PID 5388 | JavaScript error: resource:///modules/Interactions.jsm, line 230: NS_ERROR_FAILURE: Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIUserIdleService.removeIdleObserver]
[task 2021-08-25T20:26:12.519Z] 20:26:12     INFO - PID 3184 | ###!!! [Parent][RunMessage] Error: Channel closing: too late to send/recv, messages will be lost
[task 2021-08-25T20:26:12.588Z] 20:26:12     INFO - Browser exited with return code 0

Comment 5

[Intermittent Failures Robot]

1 failures in 2580 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• mozilla-beta: 1

Platform and build breakdown:

• windows10-64-2004-shippable-qr: 1
  • opt: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1695570&startday=2021-08-23&endday=2021-08-29&tree=all

Comment 6

[BugBot [:suhaib / :marco/ :calixte]]

https://wiki.mozilla.org/Bug_Triage#Intermittent_Test_Failure_Cleanup
For more information, please visit auto_nag documentation.

Comment 7

[Intermittent Failures Robot]

1 failures in 2873 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 1

Platform and build breakdown:

• windows10-64-2004-qr: 1
  • debug: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1695570&startday=2021-09-20&endday=2021-09-26&tree=all

Comment 8

[Atila Butkovits]

Recent failure log: https://treeherder.mozilla.org/logviewer?job_id=356469473&repo=autoland&lineNumber=2376

Comment 9

[Intermittent Failures Robot]

1 failures in 2845 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 1

Platform and build breakdown:

• windows10-64-2004-qr: 1
  • opt: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1695570&startday=2021-10-25&endday=2021-10-31&tree=all

Comment 10

[Intermittent Failures Robot]

2 failures in 3030 pushes (0.001 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 2

Platform and build breakdown:

• windows10-64-2004-shippable-qr: 1
  • opt: 1
• windows10-32-2004-qr: 1
  • opt: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1695570&startday=2021-11-01&endday=2021-11-07&tree=all

Comment 11

[Intermittent Failures Robot]

2 failures in 2723 pushes (0.001 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• try: 1
• autoland: 1

Platform and build breakdown:

• windows10-64-2004-devedition-qr: 1
  • opt: 1
• windows10-64-2004-qr: 1
  • opt: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1695570&startday=2021-11-08&endday=2021-11-14&tree=all

Comment 12

[Intermittent Failures Robot]

1 failures in 2819 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 1

Platform and build breakdown:

• windows10-64-2004-qr: 1
  • opt: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1695570&startday=2021-11-22&endday=2021-11-28&tree=all

Comment 13

[Intermittent Failures Robot]

1 failures in 3170 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 1

Platform and build breakdown:

• windows10-64-2004-shippable-qr: 1
  • opt: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1695570&startday=2021-11-29&endday=2021-12-05&tree=all

Comment 14

[Intermittent Failures Robot]

1 failures in 3319 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• mozilla-central: 1

Platform and build breakdown:

• windows10-32-2004-qr: 1
  • debug: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1695570&startday=2021-12-06&endday=2021-12-12&tree=all

Comment 15

[Intermittent Failures Robot]

1 failures in 3263 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 1

Platform and build breakdown:

• windows10-64-2004-qr: 1
  • opt: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1695570&startday=2021-12-13&endday=2021-12-19&tree=all

Comment 16

[BugBot [:suhaib / :marco/ :calixte]]

https://wiki.mozilla.org/Bug_Triage#Intermittent_Test_Failure_Cleanup
For more information, please visit auto_nag documentation.

Comment 17

[Treeherder Bug Filer]

New failure instance: https://treeherder.mozilla.org/logviewer?job_id=363931810&repo=mozilla-central

Comment 18

[Intermittent Failures Robot]

3 failures in 3060 pushes (0.001 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• mozilla-central: 2
• autoland: 1

Platform and build breakdown:

• windows10-64-2004-shippable-qr: 2
  • opt: 2
• windows10-64-2004-qr: 1
  • opt: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1695570&startday=2022-01-10&endday=2022-01-16&tree=all

Comment 19

[Intermittent Failures Robot]

1 failures in 3445 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 1

Platform and build breakdown:

• windows10-32-2004-shippable-qr: 1
  • opt: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1695570&startday=2022-01-24&endday=2022-01-30&tree=all

Comment 20

[Intermittent Failures Robot]

1 failures in 3165 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 1

Platform and build breakdown:

• windows10-32-2004-qr: 1
  • opt: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1695570&startday=2022-01-31&endday=2022-02-06&tree=all

Comment 21

[Intermittent Failures Robot]

1 failures in 3281 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 1

Platform and build breakdown:

• windows10-32-2004-qr: 1
  • opt: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1695570&startday=2022-02-14&endday=2022-02-20&tree=all

Comment 22

[Intermittent Failures Robot]

1 failures in 2992 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• mozilla-central: 1

Platform and build breakdown:

• windows10-64-2004-shippable-qr: 1
  • opt: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1695570&startday=2022-02-21&endday=2022-02-27&tree=all

Comment 23

[Intermittent Failures Robot]

1 failures in 3063 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• try: 1

Platform and build breakdown:

• windows10-64-2004-devedition-qr: 1
  • opt: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1695570&startday=2022-02-28&endday=2022-03-06&tree=all

Comment 24

[Intermittent Failures Robot]

1 failures in 2837 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 1

Platform and build breakdown:

• windows10-32-2004-qr: 1
  • opt: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1695570&startday=2022-03-07&endday=2022-03-13&tree=all

Comment 25

[Intermittent Failures Robot]

2 failures in 3323 pushes (0.001 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• mozilla-beta: 1
• autoland: 1

Platform and build breakdown:

• windows10-32-2004-shippable-qr: 1
  • opt: 1
• windows10-32-2004-qr: 1
  • opt: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1695570&startday=2022-03-28&endday=2022-04-03&tree=all

Comment 26

[Intermittent Failures Robot]

3 failures in 2922 pushes (0.001 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• mozilla-central: 3

Platform and build breakdown:

• windows10-32-2004-shippable-qr: 2
  • opt: 2
• windows10-64-2004-shippable-qr: 1
  • opt: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1695570&startday=2022-04-04&endday=2022-04-10&tree=all

Comment 27

[Intermittent Failures Robot]

2 failures in 2948 pushes (0.001 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• mozilla-release: 1
• try: 1

Platform and build breakdown:

• windows10-32-2004-shippable-qr: 2
  • opt: 2

For more details, see:
https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1695570&startday=2022-04-11&endday=2022-04-17&tree=all

Comment 28

[Intermittent Failures Robot]

1 failures in 3159 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• try: 1

Platform and build breakdown:

• windows10-64-2004-shippable-qr: 1
  • opt: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1695570&startday=2022-04-18&endday=2022-04-24&tree=all

Comment 29

[BugBot [:suhaib / :marco/ :calixte]]

https://wiki.mozilla.org/Bug_Triage#Intermittent_Test_Failure_Cleanup
For more information, please visit auto_nag documentation.

Comment 30

[Treeherder Bug Filer]

New failure instance: https://treeherder.mozilla.org/logviewer?job_id=383916604&repo=mozilla-central

Comment 31

[Intermittent Failures Robot]

1 failures in 3072 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• mozilla-central: 1

Platform and build breakdown:

• windows10-32-2004-shippable-qr: 1
  • opt: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1695570&startday=2022-07-04&endday=2022-07-10&tree=all

Comment 32

[Intermittent Failures Robot]

1 failures in 3341 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• mozilla-esr102: 1

Platform and build breakdown:

• windows10-32-2004-shippable-qr: 1
  • opt: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1695570&startday=2022-07-11&endday=2022-07-17&tree=all

Comment 33

[Intermittent Failures Robot]

1 failures in 3497 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• mozilla-central: 1

Platform and build breakdown:

• linux1804-64-ccov-qr: 1
  • opt: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1695570&startday=2022-07-18&endday=2022-07-24&tree=all

Comment 34

[BugBot [:suhaib / :marco/ :calixte]]

https://wiki.mozilla.org/Bug_Triage#Intermittent_Test_Failure_Cleanup
For more information, please visit auto_nag documentation.