mythfrontend core dumps after upgrade to Ubuntu 24.04

[abrossard-ch]

Linux mytv 6.8.0-90-generic #91-Ubuntu SMP PREEMPT_DYNAMIC Tue Nov 18 14:14:30 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
I've done "ubuntu-drivers autoinstall" to get the latests nvidia driver in place. I'm not getting any obvious errors from mythtv-backend.

Platform:
mythfrontend version: fixes/34 [v34.0+fixes.20240210.e3e165a1-0ubuntu6

• Package version:
  mythtv-backend-master/noble,noble,now 2:34.0+fixes.20240210.e3e165a1-0ubuntu6 all [installed]
  mythtv-backend/noble,now 2:34.0+fixes.20240210.e3e165a1-0ubuntu6 amd64 [installed]
  mythtv-common/noble,now 2:34.0+fixes.20240210.e3e165a1-0ubuntu6 amd64 [installed]
  mythtv-database/noble,noble,now 2:34.0+fixes.20240210.e3e165a1-0ubuntu6 all [installed,automatic]
  mythtv-frontend/noble,now 2:34.0+fixes.20240210.e3e165a1-0ubuntu6 amd64 [installed]

• Component:
  mythfrontend

What steps will reproduce the bug?

All attempts to start mythfrontend core dumps. Including when trying to use a remote display.
I'm including a full log, but to make it short, it usually ends with

2025-12-22T18:04:56.854038+01:00 mytv mythfrontend.real: mythfrontend[11292]: I CoreContext mythvdpauhelper.cpp:76 (HaveVDPAU) VDPAUHelp: HEVC Rext (Max size: 8192x8192)
2025-12-22T18:04:57.254593+01:00 mytv mythfrontend.real: mythfrontend[11292]: D SSDP portchecker.cpp:193 (checkPort) PortChecker::checkPort(): socket state 0
2025-12-22T18:04:57.755219+01:00 mytv mythfrontend.real: mythfrontend[11292]: D SSDP portchecker.cpp:193 (checkPort) PortChecker::checkPort(): socket state 2

GDB traceback:
A backtrace gave me this :

2025-12-22 17:54:48.373438 I MythCoreContext::ConnectCommandSocket(): Connecting to backend server: 192.168.10.26:6543 (try 1 of 1)
2025-12-22 17:54:48.374312 I MythCoreContext::CheckProtoVersion(): Using protocol version 91 BuzzOff
[New Thread 0x7ffee08576c0 (LWP 10447)]
[Thread 0x7ffee08576c0 (LWP 10447) exited]
Thread 1 "mythfrontend.re" received signal SIGSEGV, Segmentation fault.
0x00007fffef9e9364 in XDisplayString () from /lib/x86_64-linux-gnu/libX11.so.6
(gdb) bt
#0 0x00007fffef9e9364 in XDisplayString () at /lib/x86_64-linux-gnu/libX11.so.6
#1 0x00007ffef8405f05 in __vaDriverInit_1_0 () at /usr/lib/x86_64-linux-gnu/dri/nvidia_drv_video.so
#2 0x00007fffef98e873 in vaInitialize () at /lib/x86_64-linux-gnu/libva.so.2
#3 0x00007ffff05c21ea in ??? () at /lib/libmythavutil.so.57
#4 0x00007ffff05bc501 in av_hwdevice_ctx_create () at /lib/libmythavutil.so.57
#5 0x00007ffff796ec6f in MythCodecContext::CreateDevice(AVHWDeviceType, MythInteropGPU*, QString const&) () at /lib/libmythtv-34.so.34
#6 0x00007ffff79e5051 in MythVAAPIContext::HaveVAAPI(bool) () at /lib/libmythtv-34.so.34
#7 0x00007ffff7970392 in MythCodecContext::GetDecoders(RenderOptions&, bool) () at /lib/libmythtv-34.so.34
#8 0x00007ffff79ba955 in MythVideoProfile::InitStatics(bool) () at /lib/libmythtv-34.so.34
#9 0x00007ffff270ce16 in ??? () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007ffff6d012a9 in MythMainWindow::Init(bool) () at /lib/libmythui-34.so.34
#11 0x00005555555f3575 in ??? ()

mythfrontend-output-v-all.txt.gz