Bug: Intermittent browser/base/content/test/performance/browser_startup_syncIPC.js | sync IPC PCompositorBridge::Msg_FlushRendering happened 2 but max is 1 before handling user events -
Status: RESOLVED
Priority: P5
Resolution: INCOMPLETE
Created: 2022-01-28 06:28:23+00:00
Resolved: 2022-06-14 17:07:28+00:00

**Filed by:** nfay [at] mozilla.com
**Parsed log:** https://treeherder.mozilla.org/logviewer?job_id=365866713&repo=autoland
**Full log:** https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/CbJ3JoTNR1msKPWoeSq7qg/runs/0/artifacts/public/logs/live_backing.log

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```
[task 2022-01-28T04:58:50.597Z] 04:58:50     INFO - TEST-START | browser/base/content/test/performance/browser_startup_syncIPC.js
[task 2022-01-28T04:58:50.610Z] 04:58:50     INFO - TEST-INFO | started process screentopng
[task 2022-01-28T04:58:51.044Z] 04:58:51     INFO - TEST-INFO | screentopng: exit 0
[task 2022-01-28T04:58:51.045Z] 04:58:51     INFO - Buffered messages logged at 04:58:50
[task 2022-01-28T04:58:51.045Z] 04:58:51     INFO - Entering test bound 
[task 2022-01-28T04:58:51.046Z] 04:58:51     INFO - known sync IPC before first paint:
[task 2022-01-28T04:58:51.046Z] 04:58:51     INFO -   PWebRenderBridge::Msg_EnsureConnected - at most 1 times
[task 2022-01-28T04:58:51.046Z] 04:58:51     INFO -   PCompositorBridge::Msg_NotifyChildCreated - at most 1 times
[task 2022-01-28T04:58:51.049Z] 04:58:51     INFO - TEST-PASS | browser/base/content/test/performance/browser_startup_syncIPC.js | sync IPC PWebRenderBridge::Msg_EnsureConnected happened as many times as expected before first paint - 
[task 2022-01-28T04:58:51.050Z] 04:58:51     INFO - TEST-PASS | browser/base/content/test/performance/browser_startup_syncIPC.js | sync IPC PCompositorBridge::Msg_NotifyChildCreated happened as many times as expected before first paint - 
[task 2022-01-28T04:58:51.054Z] 04:58:51     INFO - known sync IPC before handling user events:
[task 2022-01-28T04:58:51.054Z] 04:58:51     INFO -   PCompositorBridge::Msg_FlushRendering - at most 1 times
[task 2022-01-28T04:58:51.054Z] 04:58:51     INFO - Buffered messages finished
[task 2022-01-28T04:58:51.055Z] 04:58:51     INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/performance/browser_startup_syncIPC.js | sync IPC PCompositorBridge::Msg_FlushRendering happened 2 but max is 1 before handling user events - 
[task 2022-01-28T04:58:51.055Z] 04:58:51     INFO - Stack trace:
[task 2022-01-28T04:58:51.056Z] 04:58:51     INFO - chrome://mochikit/content/browser-test.js:test_ok:1375
[task 2022-01-28T04:58:51.056Z] 04:58:51     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/browser_startup_syncIPC.js:null:398
[task 2022-01-28T04:58:51.057Z] 04:58:51     INFO - known sync IPC before becoming idle:
[task 2022-01-28T04:58:51.057Z] 04:58:51     INFO -   PCompositorBridge::Msg_NotifyChildCreated - at most 1 times
[task 2022-01-28T04:58:51.057Z] 04:58:51     INFO -   PLayerTransaction::Msg_GetTextureFactoryIdentifier - at most 1 times
[task 2022-01-28T04:58:51.057Z] 04:58:51     INFO -   PWebRenderBridge::Msg_EnsureConnected - at most 1 times
[task 2022-01-28T04:58:51.057Z] 04:58:51     INFO -   PCompositorBridge::Msg_FlushRendering - at most 1 times
[task 2022-01-28T04:58:51.058Z] 04:58:51     INFO - TEST-PASS | browser/base/content/test/performance/browser_startup_syncIPC.js | sync IPC PCompositorBridge::Msg_NotifyChildCreated allowed 1 but only happened 0 times before becoming idle - 
[task 2022-01-28T04:58:51.058Z] 04:58:51     INFO - TEST-PASS | browser/base/content/test/performance/browser_startup_syncIPC.js | sync IPC PLayerTransaction::Msg_GetTextureFactoryIdentifier allowed 1 but only happened 0 times before becoming idle - 
[task 2022-01-28T04:58:51.059Z] 04:58:51     INFO - TEST-PASS | browser/base/content/test/performance/browser_startup_syncIPC.js | sync IPC PWebRenderBridge::Msg_EnsureConnected happened as many times as expected before becoming idle - 
[task 2022-01-28T04:58:51.063Z] 04:58:51     INFO - TEST-PASS | browser/base/content/test/performance/browser_startup_syncIPC.js | sync IPC PCompositorBridge::Msg_FlushRendering allowed 1 but only happened 0 times before becoming idle - 
[task 2022-01-28T04:58:51.063Z] 04:58:51     INFO - Not taking screenshot here: see the one that was previously logged
[task 2022-01-28T04:58:51.065Z] 04:58:51     INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/performance/browser_startup_syncIPC.js | Unexpected sync IPC behavior during startup; open the profile_startup_syncIPC.json artifact in the Firefox Profiler to see what happened - 
[task 2022-01-28T04:58:51.065Z] 04:58:51     INFO - Stack trace:
[task 2022-01-28T04:58:51.065Z] 04:58:51     INFO - chrome://mochikit/content/browser-test.js:test_ok:1375
[task 2022-01-28T04:58:51.065Z] 04:58:51     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/browser_startup_syncIPC.js:null:416
[task 2022-01-28T04:58:51.065Z] 04:58:51     INFO - Leaving test bound 
[task 2022-01-28T04:58:51.066Z] 04:58:51     INFO - GECKO(3724) | MEMORY STAT | vsize 11465MB | residentFast 499MB | heapAllocated 263MB
[task 2022-01-28T04:58:51.067Z] 04:58:51     INFO - TEST-OK | browser/base/content/test/performance/browser_startup_syncIPC.js | took 206ms
[task 2022-01-28T04:58:51.067Z] 04:58:51     INFO - checking window state
[task 2022-01-28T04:58:51.067Z] 04:58:51     INFO - GECKO(3724) | must wait for focus
[task 2022-01-28T04:58:51.068Z] 04:58:51     INFO - GECKO(3724) | Completed ShutdownLeaks collections in process 3724
[task 2022-01-28T04:58:51.068Z] 04:58:51     INFO - TEST-START | Shutdown
[task 2022-01-28T04:58:51.068Z] 04:58:51     INFO - Browser Chrome Test Summary
[task 2022-01-28T04:58:51.069Z] 04:58:51     INFO - Passed:  16
[task 2022-01-28T04:58:51.069Z] 04:58:51     INFO - Failed:  2
[task 2022-01-28T04:58:51.071Z] 04:58:51     INFO - Todo:    1
[task 2022-01-28T04:58:51.072Z] 04:58:51     INFO - Mode:    e10s
[task 2022-01-28T04:58:51.072Z] 04:58:51     INFO - *** End BrowserChrome Test Results ***

```