Nsight Systems: Cannot mix incompatible Qt library

[Alexander Lieret]

Nsight systems does not start with the following error message:
$ nsys-ui
OpenGL version: "3.1 Mesa 22.0.5"
Cannot mix incompatible Qt library (5.15.3) with this library (5.15.2)

This crash happens on both of my Ubuntu 22.04 machines and on a fresh VM with Ubuntu 22.10 (different Qt versions).

Further information:

$ lsb_release -rd
Description: Ubuntu 22.04.1 LTS
Release: 22.04

$ apt-cache policy nvidia-cuda-toolkit
nvidia-cuda-toolkit:
  Installed: 11.5.1-1ubuntu1
  Candidate: 11.5.1-1ubuntu1
  Version table:
 *** 11.5.1-1ubuntu1 500
        500 http://de.archive.ubuntu.com/ubuntu jammy/multiverse amd64 Packages
        100 /var/lib/dpkg/status

$ apt-cache policy nsight-systems
nsight-systems:
  Installed: 2021.3.3.2~11.5.1-1ubuntu1
  Candidate: 2021.3.3.2~11.5.1-1ubuntu1
  Version table:
 *** 2021.3.3.2~11.5.1-1ubuntu1 500
        500 http://de.archive.ubuntu.com/ubuntu jammy/multiverse amd64 Packages
        100 /var/lib/dpkg/status

[Alexander Lieret (alexander-lieret)]

Nsight compute is affected too.

$ ncu-ui
Cannot mix incompatible Qt library (5.15.3) with this library (5.15.2)

$ apt-cache policy nsight-compute
nsight-compute:
  Installed: 2021.3.1.4~11.5.1-1ubuntu1
  Candidate: 2021.3.1.4~11.5.1-1ubuntu1
  Version table:
 *** 2021.3.1.4~11.5.1-1ubuntu1 500
        500 http://de.archive.ubuntu.com/ubuntu jammy/multiverse amd64 Packages
        100 /var/lib/dpkg/status

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[KestasJK (kestas-j-k)]

I had this issue also. I was able to work around it by linking against the right library in pip, which is a nasty hack but it gets it working (and it has been almost a year):

pip install pyqt5==5.15.2
export LD_LIBRARY_PATH=/home/username/miniconda3/lib/python3.7/site-packages/PyQt5/Qt5/lib/

[Michael T (michaeltandy)]

I've also encountered this bug. It's crash report e174023a-4cc2-11ee-a5c8-fa163e993415 for people with the power to view crash reports.

After checking with strace, it would appear that almost every Qt library is loaded from /usr/lib/nsight-compute/host/linux-desktop-glibc_2_11_3-x64/ with the exception of libQt5Network.so which is loaded from /usr/lib/x86_64-linux-gnu/libQt5Network.so.5.15.3 (and is provided by the package libqt5network5)

And it would appear the version of Qt bundled with nsight-compute is version 5.15.2 - while the OS package provides version 5.15.3.

I was able to work around the issue by obtaining a copy of libQt5Network.so.5.15.2 and copying it to /usr/lib/nsight-compute/host/linux-desktop-glibc_2_11_3-x64/libQt5Network.so.5