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27 Feb 2017
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TOPIC: KStars crashes during session

KStars crashes during session 3 weeks 16 hours ago #17138

  • Kaczorek
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I'm constantly getting KStars crash after a few images are captured with Ekos. I cannot debug it due to the following error:
astroberry@astroberry:~$ gdb --args kstars
GNU gdb (Ubuntu 7.11.1-0ubuntu1~16.04) 7.11.1
Copyright (C) 2016 Free Software Foundation, Inc.
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Reading symbols from kstars...Reading symbols from /usr/lib/debug//usr/bin/kstars...done.
done.
(gdb) run
Starting program: /usr/bin/kstars 

Program received signal SIGSEGV, Segmentation fault.
0x76fd9822 in ?? () from /lib/ld-linux-armhf.so.3
(gdb) bt
#0  0x76fd9822 in ?? () from /lib/ld-linux-armhf.so.3
#1  0x76fd983a in ?? () from /lib/ld-linux-armhf.so.3
Backtrace stopped: previous frame identical to this frame (corrupt stack?)

I have reports from my mates of the same issue.
phonon4qt5-backend-gstreamer has been replaced with phonon4qt5-backend-vlc was installed. So I assume that it's not notifications issue.
There's nothing meaningful in the KStars logs.

When running from terminal KStars segfaults with the following:
astroberry@astroberry:~$ kstars
libEGL warning: DRI2: failed to authenticate
Dispatch command error(-2): Error: Property SIMULATORMODE not found in device EQMod Mount.
<delProperty device="EQMod Mount" name="SIMULATORMODE" timestamp="2017-06-03T20:17:24"/>
Dispatch command error(-2): Error: Property SIMULATORWORM not found in device EQMod Mount.
<delProperty device="EQMod Mount" name="SIMULATORWORM" timestamp="2017-06-03T20:17:24"/>
Dispatch command error(-2): Error: Property SIMULATORRATIO not found in device EQMod Mount.
<delProperty device="EQMod Mount" name="SIMULATORRATIO" timestamp="2017-06-03T20:17:24"/>
Dispatch command error(-2): Error: Property SIMULATORMOTOR not found in device EQMod Mount.
<delProperty device="EQMod Mount" name="SIMULATORMOTOR" timestamp="2017-06-03T20:17:24"/>
Dispatch command error(-2): Error: Property SIMULATORHIGHSPEED not found in device EQMod Mount.
<delProperty device="EQMod Mount" name="SIMULATORHIGHSPEED" timestamp="2017-06-03T20:17:24"/>
Dispatch command error(-2): Error: Property SIMULATORMCVERSION not found in device EQMod Mount.
<delProperty device="EQMod Mount" name="SIMULATORMCVERSION" timestamp="2017-06-03T20:17:24"/>
Found one coordinate representation.
Segmentation fault

Any ideas?

UPDATE: I have just found out that setting delay in Ekos capture module (e.g. 10s) between images keeps the session stable. Are we facing a race condition somewhere in the code?

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Last Edit: by Kaczorek.

KStars crashes during session 3 weeks 15 hours ago #17140

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Thank you for the 10s find... I will try this next session.

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KStars crashes during session 3 weeks 6 hours ago #17146

Thanks for report, I will try to test this tonight in my observatory.

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KStars crashes during session 3 weeks 43 minutes ago #17158

I *think* I fixed the issue, there should be a new build within the next couple of hours.
The following user(s) said Thank You: Kaczorek, xsnrg

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KStars crashes during session 2 weeks 2 days ago #17221

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I have just tested it and it looks like the issue has been fixed. Thanks a lot Jasem.
Out of curiosity - what was the root cause of the issue?

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KStars crashes during session 2 weeks 1 day ago #17232

It was loading WCS data asynchronously. It is a CPU intensive process so it was offloaded to a separate thread. However, sometimes the FITS file itself is closed before the WCS loading is over and hence you get crash on slow machines. WCS data is now loaded on demand.
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KStars crashes during session 2 weeks 1 day ago #17242

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It was definitely fixed with the imaging session. However, I have just noted that when you select Show Equatorial Gridlines on Setup tab in Ekos the KStars goes down. Is is possible that it's related to loading WCS on demand?

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