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Issue metadata

Status: Assigned
Owner:
Cc:
Components:
EstimatedDays: ----
NextAction: ----
OS: Linux
Pri: 1
Type: Bug



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Devtools performance panel sometimes does not show slices

Project Member Reported by dproy@chromium.org, Oct 2

Issue description

Chrome Version: 69.0.3497.100 (Official Build) (64-bit)
Revision	8920e690dd011895672947112477d10d5c8afb09-refs/branch-heads/3497@{#948}
OS: Linux

About once every five times I try to record a profile using devtools performance panel, none of the slices render, although the hover tooltips still work. Attached a video to explain what I mean, and attached a trace that causes this issue if you load it.  

There is no error on the console - I only see "Main._createAppUI: xx ms ..." in the logs.  
 
devtools-empty.mp4
434 KB View Download
devtools-invisible-slices-trace.json
3.4 MB View Download
Owner: alph@chromium.org
Status: Assigned (was: Untriaged)
I have seen similar reports. Are you profiling a WebGL related page?
See  issue 890453 
Not exactly WebGL, but I have canvas elements on the page. 
Labels: Needs-Bisect
If you can reproduce it on your side, may I ask you to bisect the build that broke it?  There is a report saying that 69.0.3497.81 worked fine. I'd really appreciate your help. Thanks.
Cc: viswa.karala@chromium.org
Labels: Needs-Triage-M69 Needs-Feedback Triaged-ET
Unable to reproduce the issue on chrome reported version# 69.0.3497.100 using Ubuntu 14.04 with steps mentioned below:
1) Launched chrome reported version and created one local server with port: 8000
2) On browser navigated to localhost:8000 and opened one file(for example i have opened '.html' file)
3) Then navigated to Devtools > Performance tab, recorder one session and under the performance Tab section able to see the slices

Observations: Also tested the issue by navigating to a random page and opened Devtools > Performance tab, recorder one session and under the performance Tab section able to see the slices

@Reporter: Please find the attached screencast for your reference and let us know if we missed anything in reproducing the issue, provide your feedback on it which help in further triaging it in better way.

Thanks!
891402.ogv
3.3 MB View Download
viswa.karala@: This doesn't happen for all traces. You can load the trace I attached. Repro steps would be:
(1) Open chrome, open devtools performance panel. 
(2) Right click -> Load profile
(3) Select the trace I attached. 

The attached trace loads fine with the version of devtools at https://chromedevtools.github.io/timeline-viewer/, which makes me think the problem is not in the trace. 


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