Bug 217460

Summary:	kernelshark does not display graphs properly
Product:	Tools	Reporter:	Vitaly Chikunov (vt)
Component:	Trace-cmd/Kernelshark	Assignee:	Default virtual assignee for Trace-cmd and kernelshark (tools_tracecmd_kernelshark)
Status:	RESOLVED INVALID
Severity:	normal	CC:	y.karadz
Priority:	P3
Hardware:	All
OS:	Linux
Kernel Version:		Subsystem:
Regression:	No	Bisected commit-id:
Attachments:	trace.data and screenshot

Description Vitaly Chikunov 2023-05-18 15:24:52 UTC

Created attachment 304289 [details]
trace.data and screenshot

It seem that kernelshark 2.2.0 does not display graph correctly. For example no text or scales are visible, only vertical bars.

In the attachment `trace.dat` and screenshot for it.

We have it compiled with Qt 5.15.9.

Additional screenshot at the link https://attachments.bugzilla.altlinux.org/attachment.cgi?id=13217 for easy viewing.

Comment 1 Vitaly Chikunov 2023-05-18 16:04:40 UTC

It's may be possible to reproduce in Docker:

When `trace.dat` is in `$PWD/ks/`
```
$ docker run --rm --net=host -it -e DISPLAY --volume="$HOME/.Xauthority:/root/.Xauthority:rw" -v /tmp/.X11-unix:/tmp/.X11-unix -v $PWD/ks:/ks alt:sisyphus
```
Then
```
docker# apt-get install -y kernelshark xorg-dri-swrast xorg-dri-intel fonts-ttf-dejavu
docker# cd /ks
docker# kernelshark
```

Comment 2 Yordan Karadzhov 2023-05-18 16:14:59 UTC

Hi Vitaly,

Unfortunately I am unable to reproduce the problem on my machine. Nevertheless, I'v been seeing something similar before. See:
https://bugzilla.kernel.org/show_bug.cgi?id=203871

At the end the conclusion was that the problems disappears after building  Qt from sources instead of using the distro package. You can also try doing the debugging steps suggested in comment 34.

thanks!
Y.

Comment 3 Vitaly Chikunov 2023-05-18 16:55:14 UTC

Thanks that link is really helpful!
I am building kernelshark package for ALT Linux so rebuilding Qt from the source is not solution from me.
It seems that Tzvetomir Stoyanov suggested right thing about missing `FreeSans.ttf`. After I installed `fonts-ttf-freefont` problem is resolved itself, so I will add it to dependencies.

Thanks much again!