1607848 - Intermittent devtools/shared/resources/tests/browser_target_list_workers.js | A promise chain failed to handle a rejection: this.transport is null - stack: send@resource://devtools/server/debugger-server-connection.js:91:5

Status: RESOLVED FIXED

(DevTools :: General, defect, P5)

Description

[Treeherder Bug Filer]

Filed by: ccoroiu [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer.html#?job_id=284048679&repo=autoland
Full log: https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/RFZNF_1LR5K9PynyGRgPZA/runs/0/artifacts/public/logs/live_backing.log

---

task 2020-01-08T17:32:08.135Z] 17:32:08 INFO - TEST-PASS | devtools/shared/resources/tests/browser_target_list_workers.js | Got the exact same target front -
[task 2020-01-08T17:32:08.136Z] 17:32:08 INFO - Leaving test bound
[task 2020-01-08T17:32:08.137Z] 17:32:08 INFO - Removing tab.
[task 2020-01-08T17:32:08.137Z] 17:32:08 INFO - Waiting for event: 'TabClose' on [object XULElement].
[task 2020-01-08T17:32:08.137Z] 17:32:08 INFO - Got event: 'TabClose' on [object XULElement].
[task 2020-01-08T17:32:08.137Z] 17:32:08 INFO - Tab removed and finished closing
[task 2020-01-08T17:32:08.138Z] 17:32:08 INFO - TEST-PASS | devtools/shared/resources/tests/browser_target_list_workers.js | The main process DebuggerServer has no pending connection when the test ends -
[task 2020-01-08T17:32:08.138Z] 17:32:08 INFO - Buffered messages finished
[task 2020-01-08T17:32:08.143Z] 17:32:08 INFO - TEST-UNEXPECTED-FAIL | devtools/shared/resources/tests/browser_target_list_workers.js | A promise chain failed to handle a rejection: this.transport is null - stack: send@resource://devtools/server/debugger-server-connection.js:91:5
[task 2020-01-08T17:32:08.144Z] 17:32:08 INFO - writeError@resource://devtools/shared/protocol/Actor.js:98:15
[task 2020-01-08T17:32:08.144Z] 17:32:08 INFO - generateRequestHandlers/</handler/</<@resource://devtools/shared/protocol/Actor.js:187:30
[task 2020-01-08T17:32:08.145Z] 17:32:08 INFO - promise callbackgenerateRequestHandlers/</handler/<@resource://devtools/shared/protocol/Actor.js:187:14
[task 2020-01-08T17:32:08.145Z] 17:32:08 INFO - _queueResponse@resource://devtools/shared/protocol/Actor.js:107:28
[task 2020-01-08T17:32:08.146Z] 17:32:08 INFO - handler@resource://devtools/shared/protocol/Actor.js:183:14
[task 2020-01-08T17:32:08.146Z] 17:32:08 INFO - onPacket@resource://devtools/server/debugger-server-connection.js:380:58
[task 2020-01-08T17:32:08.146Z] 17:32:08 INFO - send/<@resource://devtools/shared/transport/local-transport.js:68:25
[task 2020-01-08T17:32:08.147Z] 17:32:08 INFO - exports.makeInfallible/<@resource://devtools/shared/ThreadSafeDevToolsUtils.js:111:22
[task 2020-01-08T17:32:08.148Z] 17:32:08 INFO - DevToolsUtils.executeSoonexports.executeSoon@resource://devtools/shared/DevToolsUtils.js:62:21
[task 2020-01-08T17:32:08.148Z] 17:32:08 INFO - send@resource://devtools/shared/transport/local-transport.js:56:21
[task 2020-01-08T17:32:08.148Z] 17:32:08 INFO - send@resource://devtools/shared/protocol/Front.js:198:30
[task 2020-01-08T17:32:08.148Z] 17:32:08 INFO - request@resource://devtools/shared/protocol/Front.js:216:10
[task 2020-01-08T17:32:08.148Z] 17:32:08 INFO - generateRequestMethods/</frontProto[name]@resource://devtools/shared/protocol/Front/FrontClassWithSpec.js:49:19
[task 2020-01-08T17:32:08.148Z] 17:32:08 INFO - getTarget/this._targetFrontPromise<@resource://devtools/shared/fronts/descriptors/process.js:74:40
[task 2020-01-08T17:32:08.149Z] 17:32:08 INFO - getTarget@resource://devtools/shared/fronts/descriptors/process.js:91:7
[task 2020-01-08T17:32:08.149Z] 17:32:08 INFO - _processListChanged@resource://devtools/shared/resources/target-list.js:52:41
[task 2020-01-08T17:32:08.149Z] 17:32:08 INFO - Asyncemit@resource://devtools/shared/event-emitter.js:195:24
[task 2020-01-08T17:32:08.149Z] 17:32:08 INFO - emit@resource://devtools/shared/event-emitter.js:276:18
[task 2020-01-08T17:32:08.149Z] 17:32:08 INFO - onPacket@resource://devtools/shared/protocol/Front.js:252:13
[task 2020-01-08T17:32:08.149Z] 17:32:08 INFO - onPacket@resource://devtools/shared/client/debugger-client.js:498:13
[task 2020-01-08T17:32:08.149Z] 17:32:08 INFO - send/<@resource://devtools/shared/transport/local-transport.js:68:25
[task 2020-01-08T17:32:08.149Z] 17:32:08 INFO - exports.makeInfallible/<@resource://devtools/shared/ThreadSafeDevToolsUtils.js:111:22
[task 2020-01-08T17:32:08.150Z] 17:32:08 INFO - DevToolsUtils.executeSoonexports.executeSoon@resource://devtools/shared/DevToolsUtils.js:62:21
[task 2020-01-08T17:32:08.150Z] 17:32:08 INFO - send@resource://devtools/shared/transport/local-transport.js:56:21
[task 2020-01-08T17:32:08.150Z] 17:32:08 INFO - send@resource://devtools/server/debugger-server-connection.js:91:20
[task 2020-01-08T17:32:08.150Z] 17:32:08 INFO - onProcessListChanged@resource://devtools/server/actors/root.js:553:15
[task 2020-01-08T17:32:08.150Z] 17:32:08 INFO - observe@resource://devtools/server/actors/process.js:73:12
[task 2020-01-08T17:32:08.151Z] 17:32:08 INFO - Rejection date: Wed Jan 08 2020 17:32:07 GMT+0000 (Coordinated Universal Time) - false == true - JS frame :: resource://testing-common/PromiseTestUtils.jsm :: assertNoUncaughtRejections :: line 265
[task 2020-01-08T17:32:08.151Z] 17:32:08 INFO - Stack trace:
[task 2020-01-08T17:32:08.151Z] 17:32:08 INFO - resource://testing-common/PromiseTestUtils.jsm:assertNoUncaughtRejections:265
[task 2020-01-08T17:32:08.151Z] 17:32:08 INFO - chrome://mochikit/content/browser-test.js:nextTest:624
[task 2020-01-08T17:32:08.152Z] 17:32:08 INFO - chrome://mochikit/content/browser-test.js:testScope/test_finish/<:1457
[task 2020-01-08T17:32:08.152Z] 17:32:08 INFO - chrome://mochikit/content/browser-test.js:run:1372
[task 2020-01-08T17:32:08.152Z] 17:32:08 INFO - GECKO(3415) | JavaScript error: resource://devtools/server/debugger-server-connection.js, line 91: TypeError: this.transport is null
[task 2020-01-08T17:32:08.152Z] 17:32:08 INFO - Console message: [JavaScript Error: "TypeError: this.transport is null" {file: "resource://devtools/server/debugger-server-connection.js" line: 91}]
[task 2020-01-08T17:32:08.152Z] 17:32:08 INFO - GECKO(3415) | MEMORY STAT | vsize 20975074MB | residentFast 1099MB

Comment 2

[Sebastian Hengst [:aryx] (needinfo me if it's about an intermittent or backout)]

This fails frequently. Alexandre, please investigate (at the current failure rate, either the test would get disabled or the changes backed out).

Comment 3

[Intermittent Failures Robot]

32 failures in 819 pushes (0.039 failures/push) were associated with this bug yesterday.

Repository breakdown:

• autoland: 29
• try: 2
• mozilla-central: 1

Platform breakdown:

• linux64: 30
• windows10-64: 2

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1607848&startday=2020-01-09&endday=2020-01-09&tree=all

Comment 4

[Intermittent Failures Robot]

28 failures in 831 pushes (0.034 failures/push) were associated with this bug yesterday.

Repository breakdown:

• autoland: 25
• mozilla-central: 1
• try: 2

Platform breakdown:

• linux64: 27
• linux1804-64-asan: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1607848&startday=2020-01-10&endday=2020-01-10&tree=all

Comment 5

[Intermittent Failures Robot]

81 failures in 4472 pushes (0.018 failures/push) were associated with this bug in the last 7 days.

This is the #10 most frequent failure this week.

** This failure happened more than 75 times this week! Resolving this bug is a very high priority. **

** Try to resolve this bug as soon as possible. If unresolved for 1 week, the affected test(s) may be disabled. **

Repository breakdown:

• autoland: 68
• try: 7
• mozilla-central: 6

Platform breakdown:

• linux64: 74
• windows10-64: 5
• linux1804-64-asan: 2

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1607848&startday=2020-01-06&endday=2020-01-12&tree=all

Comment 6

[Alexandre Poirot [:ochameau] [PTO back August 21]]

I think that I'm having a promising patch.

Try run without the patch:
https://treeherder.mozilla.org/#/jobs?repo=try&selectedJob=284640658&revision=5a40ac0a6f265c2bf02ffcea66dc122fd80ce4c9

With the patch:
https://treeherder.mozilla.org/#/jobs?repo=try&selectedJob=284640658&revision=277df89dc7f1252cd11997c3c416aab38798a482

Would you happen to know if there is some other test from this folder suffering from the same exception?

Comment 7

[Sebastian Hengst [:aryx] (needinfo me if it's about an intermittent or backout)]

No, didn't find any bug created in last 30 days in the same folder and mentioning this.transport is null.

Comment 8

[Alexandre Poirot [:ochameau] [PTO back August 21]]

Attachment: Bug 1607848 - Disable process preload to prevent creating process randomly during test run.

Comment 9

[Intermittent Failures Robot]

39 failures in 693 pushes (0.056 failures/push) were associated with this bug yesterday.

Repository breakdown:

• autoland: 32
• mozilla-central: 1
• try: 6

Platform breakdown:

• linux64: 29
• windows10-64: 7
• linux1804-64-asan: 3

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1607848&startday=2020-01-13&endday=2020-01-13&tree=all

Comment 10

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/51ceb7c47581
Disable process preload to prevent creating process randomly during test run. r=jdescottes

Comment 11

[Cristian Brindusan [:cbrindusan]]

https://hg.mozilla.org/mozilla-central/rev/51ceb7c47581

Comment 12

[Intermittent Failures Robot]

20 failures in 819 pushes (0.024 failures/push) were associated with this bug yesterday.

Repository breakdown:

• autoland: 19
• try: 1

Platform breakdown:

• linux64: 18
• windows10-64: 2

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1607848&startday=2020-01-14&endday=2020-01-14&tree=all

Comment 13

[Intermittent Failures Robot]

60 failures in 3773 pushes (0.016 failures/push) were associated with this bug in the last 7 days.

This is the #18 most frequent failure this week.

** This failure happened more than 30 times this week! Resolving this bug is a high priority. **

** Try to resolve this bug as soon as possible. If unresolved for 2 weeks, the affected test(s) may be disabled. **

Repository breakdown:

• autoland: 51
• mozilla-central: 1
• try: 8

Platform breakdown:

• linux64: 48
• windows10-64: 9
• linux1804-64-asan: 3

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1607848&startday=2020-01-13&endday=2020-01-19&tree=all