Segmentation fault (SEGV_MAPERR, null deref) during "Checking for update" — reproduces on v6.0.9 and v8.2.0, survived full OS upgrade

Segmentation fault (SEGV_MAPERR, null deref) during "Checking for update" — reproduces on v6.0.9 and v8.2.0, survived full OS upgrade

Environment:

• OS: Linux Mint 22.3 (upgraded from earlier version; crash predates and survives the upgrade)
• Hardware: Dell Precision 7530 (dual-GPU: Intel + NVIDIA Quadro)
• Install: official .deb (amd64), dpkg-verified clean, v8.2.0

Crash signal: SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0x11a8}

100% reproducible. App launches, server starts on localhost:42000, then crashes immediately after "Checking for update..." every time.

Ruled out:

• GPU/driver (identical with --disable-gpu --no-sandbox)
• Network (tcpdump: zero outbound connections attempted before crash)
• Package integrity (dpkg -s clean, app-update.yml valid)
• User config (crashes on fresh ~/.config/Pinokio, tried multiple times)
• Keyring/secret storage (gnome-keyring-daemon running; --password-store=basic no change)
• D-Bus session (confirmed reachable and responsive)
• Desktop environment identity (XDG_CURRENT_DESKTOP=GNOME override, no change)
• xdg-desktop-portal (running, healthy)
• OS library versions (crash survived full Mint 22.3 upgrade, Ubuntu 24.04 base)

Full coredumpctl backtrace and strace output available on request.