Bug 1745325 Comment 3 Edit History

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Original comment by
on 
Backed out changeset 01eb21de6aef (bug 1745325) for causing mochitest failures on browser_preview_print_coop.js.

[Range with backfills](https://treeherder.mozilla.org/jobs?repo=autoland&resultStatus=pending%2Crunning%2Csuccess%2Ctestfailed%2Cbusted%2Cexception%2Crunnable&fromchange=a441516deed774c24c791213ccef6643b5a9ea5a&searchStr=linux%2C18.04%2Cx64%2Cwebrender%2Copt%2Cmochitests%2Cwith%2Csoftware%2Cwebrender%2Cand%2Cfission%2Cenabled%2Ctest-linux1804-64-qr%2Fopt-mochitest-browser-chrome-swr-fis-e10s%2Cbc2&group_state=expanded&tochange=993272ef6db209ad1e262cc80b0e5b589c044f4e&selectedTaskRun=dOp6jGdyRqOmMSP09Xrv_g.0)

[Failure log](https://treeherder.mozilla.org/logviewer?job_id=360753258&repo=autoland&lineNumber=6928)

[Backout link](https://hg.mozilla.org/integration/autoland/rev/a436d2563fd1d44d613943dca1bef70663d34598)
```
[task 2021-12-10T05:06:24.490Z] 05:06:24     INFO - TEST-START | toolkit/components/printing/tests/browser_preview_print_coop.js
[task 2021-12-10T05:06:25.615Z] 05:06:25     INFO - GECKO(16723) | [Parent 16723, Main Thread] WARNING: GDBus.Error:org.freedesktop.DBus.Error.Spawn.FileInvalid: Cannot do system-bus activation with no user
[task 2021-12-10T05:06:25.616Z] 05:06:25     INFO - GECKO(16723) | : 'glib warning', file /builds/worker/checkouts/gecko/toolkit/xre/nsSigHandlers.cpp:139
[task 2021-12-10T05:06:25.617Z] 05:06:25     INFO - GECKO(16723) | ** (firefox:16723): WARNING **: 05:06:25.613: GDBus.Error:org.freedesktop.DBus.Error.Spawn.FileInvalid: Cannot do system-bus activation with no user
[task 2021-12-10T05:06:25.619Z] 05:06:25     INFO - GECKO(16723) | [Parent 16723, Main Thread] WARNING: GDBus.Error:org.freedesktop.DBus.Error.Spawn.FileInvalid: Cannot do system-bus activation with no user
[task 2021-12-10T05:06:25.620Z] 05:06:25     INFO - GECKO(16723) | : 'glib warning', file /builds/worker/checkouts/gecko/toolkit/xre/nsSigHandlers.cpp:139
[task 2021-12-10T05:06:25.621Z] 05:06:25     INFO - GECKO(16723) | ** (firefox:16723): WARNING **: 05:06:25.614: GDBus.Error:org.freedesktop.DBus.Error.Spawn.FileInvalid: Cannot do system-bus activation with no user
[task 2021-12-10T05:06:30.574Z] 05:06:30     INFO - TEST-INFO | started process screentopng
[task 2021-12-10T05:06:30.904Z] 05:06:30     INFO - TEST-INFO | screentopng: exit 0
[task 2021-12-10T05:06:30.905Z] 05:06:30     INFO - Buffered messages logged at 05:06:24
[task 2021-12-10T05:06:30.906Z] 05:06:30     INFO - Entering test bound test
[task 2021-12-10T05:06:30.907Z] 05:06:30     INFO - Console message: [JavaScript Warning: "This page is in Quirks Mode. Page layout may be impacted. For Standards Mode use “<!DOCTYPE html>”." {file: "about:printpreview" line: 0}]
[task 2021-12-10T05:06:30.908Z] 05:06:30     INFO - Buffered messages logged at 05:06:25
[task 2021-12-10T05:06:30.909Z] 05:06:30     INFO - TEST-PASS | toolkit/components/printing/tests/browser_preview_print_coop.js | We did not crash. - 
[task 2021-12-10T05:06:30.910Z] 05:06:30     INFO - Leaving test bound test
[task 2021-12-10T05:06:30.911Z] 05:06:30     INFO - Entering test bound testTabModal
[task 2021-12-10T05:06:30.913Z] 05:06:30     INFO - withTestPage: http://example.com/browser/toolkit/components/printing/tests/file_coop_header.html
[task 2021-12-10T05:06:30.914Z] 05:06:30     INFO - Buffered messages finished
[task 2021-12-10T05:06:30.915Z] 05:06:30     INFO - TEST-UNEXPECTED-FAIL | toolkit/components/printing/tests/browser_preview_print_coop.js | Uncaught exception - Wait for dialog - timed out after 50 tries.
[task 2021-12-10T05:06:30.917Z] 05:06:30     INFO - Leaving test bound testTabModal
[task 2021-12-10T05:06:30.917Z] 05:06:30     INFO - GECKO(16723) | MEMORY STAT | vsize 11478MB | residentFast 461MB | heapAllocated 230MB
[task 2021-12-10T05:06:30.917Z] 05:06:30     INFO - TEST-OK | toolkit/components/printing/tests/browser_preview_print_coop.js | took 6096ms
[task 2021-12-10T05:06:30.917Z] 05:06:30     INFO - Not taking screenshot here: see the one that was previously logged
[task 2021-12-10T05:06:30.919Z] 05:06:30     INFO - TEST-UNEXPECTED-FAIL | toolkit/components/printing/tests/browser_preview_print_coop.js | Found an unexpected tab at the end of test run: http://example.com/browser/toolkit/components/printing/tests/file_coop_header.html - 
[task 2021-12-10T05:06:30.919Z] 05:06:30     INFO - checking window state
[task 2021-12-10T05:06:30.919Z] 05:06:30     INFO - GECKO(16723) | must wait for focus
[task 2021-12-10T05:12:21.921Z] 05:12:21     INFO - Console message: [JavaScript Warning: "telemetry.state_file_read_errors - Unknown scalar."]
[task 2021-12-10T05:12:21.922Z] 05:12:21     INFO - Console message: [JavaScript Warning: "telemetry.generated_new_client_id - Unknown scalar."]
[task 2021-12-10T05:14:21.920Z] 05:14:21     INFO - GECKO(16723) | 1639113261918	addons.xpi	ERROR	System addon update list error Error: got node name: html, expected: updates
[task 2021-12-10T05:14:21.923Z] 05:14:21     INFO - Console message: [JavaScript Error: "1639113261918	addons.xpi	ERROR	System addon update list error Error: got node name: html, expected: updates" {file: "resource://gre/modules/Log.jsm" line: 723}]
[task 2021-12-10T05:14:21.923Z] 05:14:21     INFO - append@resource://gre/modules/Log.jsm:723:12
[task 2021-12-10T05:14:21.923Z] 05:14:21     INFO - log@resource://gre/modules/Log.jsm:379:16
[task 2021-12-10T05:14:21.924Z] 05:14:21     INFO - error@resource://gre/modules/Log.jsm:387:10
[task 2021-12-10T05:14:21.924Z] 05:14:21     INFO - updateSystemAddons/res<@resource://gre/modules/addons/XPIInstall.jsm:4055:25
[task 2021-12-10T05:14:21.924Z] 05:14:21     INFO - 
[task 2021-12-10T05:20:31.943Z] 05:20:31     INFO - Buffered messages finished
[task 2021-12-10T05:20:31.943Z] 05:20:31    ERROR - TEST-UNEXPECTED-TIMEOUT | toolkit/components/printing/tests/browser_preview_print_coop.js (finished) | application timed out after 370 seconds with no output
[task 2021-12-10T05:20:31.943Z] 05:20:31    ERROR - Force-terminating active process(es).
```
Revision 1 by
on 
Backed out for causing mochitest failures on browser_preview_print_coop.js.

[Range with backfills](https://treeherder.mozilla.org/jobs?repo=autoland&resultStatus=pending%2Crunning%2Csuccess%2Ctestfailed%2Cbusted%2Cexception%2Crunnable&fromchange=a441516deed774c24c791213ccef6643b5a9ea5a&searchStr=linux%2C18.04%2Cx64%2Cwebrender%2Copt%2Cmochitests%2Cwith%2Csoftware%2Cwebrender%2Cand%2Cfission%2Cenabled%2Ctest-linux1804-64-qr%2Fopt-mochitest-browser-chrome-swr-fis-e10s%2Cbc2&group_state=expanded&tochange=993272ef6db209ad1e262cc80b0e5b589c044f4e&selectedTaskRun=dOp6jGdyRqOmMSP09Xrv_g.0)

[Failure log](https://treeherder.mozilla.org/logviewer?job_id=360753258&repo=autoland&lineNumber=6928)

[Backout link](https://hg.mozilla.org/integration/autoland/rev/a436d2563fd1d44d613943dca1bef70663d34598)
```
[task 2021-12-10T05:06:24.490Z] 05:06:24     INFO - TEST-START | toolkit/components/printing/tests/browser_preview_print_coop.js
[task 2021-12-10T05:06:25.615Z] 05:06:25     INFO - GECKO(16723) | [Parent 16723, Main Thread] WARNING: GDBus.Error:org.freedesktop.DBus.Error.Spawn.FileInvalid: Cannot do system-bus activation with no user
[task 2021-12-10T05:06:25.616Z] 05:06:25     INFO - GECKO(16723) | : 'glib warning', file /builds/worker/checkouts/gecko/toolkit/xre/nsSigHandlers.cpp:139
[task 2021-12-10T05:06:25.617Z] 05:06:25     INFO - GECKO(16723) | ** (firefox:16723): WARNING **: 05:06:25.613: GDBus.Error:org.freedesktop.DBus.Error.Spawn.FileInvalid: Cannot do system-bus activation with no user
[task 2021-12-10T05:06:25.619Z] 05:06:25     INFO - GECKO(16723) | [Parent 16723, Main Thread] WARNING: GDBus.Error:org.freedesktop.DBus.Error.Spawn.FileInvalid: Cannot do system-bus activation with no user
[task 2021-12-10T05:06:25.620Z] 05:06:25     INFO - GECKO(16723) | : 'glib warning', file /builds/worker/checkouts/gecko/toolkit/xre/nsSigHandlers.cpp:139
[task 2021-12-10T05:06:25.621Z] 05:06:25     INFO - GECKO(16723) | ** (firefox:16723): WARNING **: 05:06:25.614: GDBus.Error:org.freedesktop.DBus.Error.Spawn.FileInvalid: Cannot do system-bus activation with no user
[task 2021-12-10T05:06:30.574Z] 05:06:30     INFO - TEST-INFO | started process screentopng
[task 2021-12-10T05:06:30.904Z] 05:06:30     INFO - TEST-INFO | screentopng: exit 0
[task 2021-12-10T05:06:30.905Z] 05:06:30     INFO - Buffered messages logged at 05:06:24
[task 2021-12-10T05:06:30.906Z] 05:06:30     INFO - Entering test bound test
[task 2021-12-10T05:06:30.907Z] 05:06:30     INFO - Console message: [JavaScript Warning: "This page is in Quirks Mode. Page layout may be impacted. For Standards Mode use “<!DOCTYPE html>”." {file: "about:printpreview" line: 0}]
[task 2021-12-10T05:06:30.908Z] 05:06:30     INFO - Buffered messages logged at 05:06:25
[task 2021-12-10T05:06:30.909Z] 05:06:30     INFO - TEST-PASS | toolkit/components/printing/tests/browser_preview_print_coop.js | We did not crash. - 
[task 2021-12-10T05:06:30.910Z] 05:06:30     INFO - Leaving test bound test
[task 2021-12-10T05:06:30.911Z] 05:06:30     INFO - Entering test bound testTabModal
[task 2021-12-10T05:06:30.913Z] 05:06:30     INFO - withTestPage: http://example.com/browser/toolkit/components/printing/tests/file_coop_header.html
[task 2021-12-10T05:06:30.914Z] 05:06:30     INFO - Buffered messages finished
[task 2021-12-10T05:06:30.915Z] 05:06:30     INFO - TEST-UNEXPECTED-FAIL | toolkit/components/printing/tests/browser_preview_print_coop.js | Uncaught exception - Wait for dialog - timed out after 50 tries.
[task 2021-12-10T05:06:30.917Z] 05:06:30     INFO - Leaving test bound testTabModal
[task 2021-12-10T05:06:30.917Z] 05:06:30     INFO - GECKO(16723) | MEMORY STAT | vsize 11478MB | residentFast 461MB | heapAllocated 230MB
[task 2021-12-10T05:06:30.917Z] 05:06:30     INFO - TEST-OK | toolkit/components/printing/tests/browser_preview_print_coop.js | took 6096ms
[task 2021-12-10T05:06:30.917Z] 05:06:30     INFO - Not taking screenshot here: see the one that was previously logged
[task 2021-12-10T05:06:30.919Z] 05:06:30     INFO - TEST-UNEXPECTED-FAIL | toolkit/components/printing/tests/browser_preview_print_coop.js | Found an unexpected tab at the end of test run: http://example.com/browser/toolkit/components/printing/tests/file_coop_header.html - 
[task 2021-12-10T05:06:30.919Z] 05:06:30     INFO - checking window state
[task 2021-12-10T05:06:30.919Z] 05:06:30     INFO - GECKO(16723) | must wait for focus
[task 2021-12-10T05:12:21.921Z] 05:12:21     INFO - Console message: [JavaScript Warning: "telemetry.state_file_read_errors - Unknown scalar."]
[task 2021-12-10T05:12:21.922Z] 05:12:21     INFO - Console message: [JavaScript Warning: "telemetry.generated_new_client_id - Unknown scalar."]
[task 2021-12-10T05:14:21.920Z] 05:14:21     INFO - GECKO(16723) | 1639113261918	addons.xpi	ERROR	System addon update list error Error: got node name: html, expected: updates
[task 2021-12-10T05:14:21.923Z] 05:14:21     INFO - Console message: [JavaScript Error: "1639113261918	addons.xpi	ERROR	System addon update list error Error: got node name: html, expected: updates" {file: "resource://gre/modules/Log.jsm" line: 723}]
[task 2021-12-10T05:14:21.923Z] 05:14:21     INFO - append@resource://gre/modules/Log.jsm:723:12
[task 2021-12-10T05:14:21.923Z] 05:14:21     INFO - log@resource://gre/modules/Log.jsm:379:16
[task 2021-12-10T05:14:21.924Z] 05:14:21     INFO - error@resource://gre/modules/Log.jsm:387:10
[task 2021-12-10T05:14:21.924Z] 05:14:21     INFO - updateSystemAddons/res<@resource://gre/modules/addons/XPIInstall.jsm:4055:25
[task 2021-12-10T05:14:21.924Z] 05:14:21     INFO - 
[task 2021-12-10T05:20:31.943Z] 05:20:31     INFO - Buffered messages finished
[task 2021-12-10T05:20:31.943Z] 05:20:31    ERROR - TEST-UNEXPECTED-TIMEOUT | toolkit/components/printing/tests/browser_preview_print_coop.js (finished) | application timed out after 370 seconds with no output
[task 2021-12-10T05:20:31.943Z] 05:20:31    ERROR - Force-terminating active process(es).
```

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