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Old 12-18-2018, 01:09 PM   #1
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Qt5 Programs (VLC / qv4l2 / notepadqq / etc) SegFault

As an FYI, this is a cross-post from ...

Basic system setup:
  • Arch
  • Core2 Duo
  • 2x GeForce GT 620's Running nvidia-390xx Driver
  • Xfce
  • 4.19.8-arch1-1-ARCH

Did a full system update (pacman -Syu) in the last week or two, first time in a while, seemed to go fine. Fired up vlc's UI for the first time today since then, nothing happened. Dropped to a terminal to troubleshoot ...

cvlc test.mp3
... audio plays. So we're not totally dead. Let's see if we can get a GUI ...

vlc test.mp3
... well hello segmentation fault and core dump. Checking details ...

vlc -vvv test.mp3
... lots of details, none useful that I can follow, then another segmentation fault and core dump. Let's try to debug ...

gdb vlc test.mp3
... maybe getting somewhere ...

Thread 5 "vlc" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffdbcfb700 (LWP 6312)]
0x00007fffdbae809f in ?? () from /usr/lib/
... let's check another Qt program ...

gdb qv4l2
... and we have another segfault pointing at the library. I tried it with notepadqq and got a segfault as well.

I took a look at and I see that Qt 5.12.0 came out on 12/5/2018. Maybe just a bug in 5.12 I have to wait out? Reverting to 5.11 didn't seem to help, though, but I have no idea what version was the last one I know worked.

Anybody have any ideas? Details and console logs available upon request.
Old 12-18-2018, 01:27 PM   #2
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You shouldn't cross-post. But yes, it more likely than not is indeed a bug, so yes, you'd likely have to wait it out.
Old 12-19-2018, 01:38 AM   #3
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Location: Chicago, IL, USA
Distribution: Arch
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Talking Revert All The Things!

I'm not totally sure where the regression ultimately lies, but reverting all the packages in the qt5 package group from 5.12 back to 5.11.2 fixed things:

pacman -U
I tested vlc, notepadqq and qv4l2 and all come up fine again.


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