Bambu Studio fails to start — GLib-GObject-CRITICAL "invalid (NULL) pointer instance", black screen

[MarieFK59]

Describe the bug
Bambu Studio crashes at startup, right after [trace] Initializing StaticPrintConfigs, with no UI window ever shown. The KasmVNC/Selkies desktop (labwc + Wayland streaming) starts and works correctly — it's actively capturing and streaming an empty desktop, which is why the browser shows a black screen with the sidebar visible but no app window.

To reproduce

1. Fresh install via docker-compose (PUID=1000, PGID=1000, shm_size 1gb, empty /config volume)
2. Open the web UI
3. Screen is black; sidebar loads fine

Logs
Running /opt/bambustudio/AppRun manually as the abc user reproduces the crash directly:

[trace]   Initializing StaticPrintConfigs

(bambu-studio:PID): GLib-GObject-CRITICAL **: invalid (NULL) pointer instance

(bambu-studio:PID): GLib-GObject-CRITICAL **: g_signal_handlers_disconnect_matched: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed

Process exits immediately after, no further output.

Tested

• Tag latest / 02.08.01 (build v02.08.01.55-ls157, 2026-07-15): crash
• Tag 02.08.00: identical crash, same binary

Environment

• Host: Fedora CoreOS, rootless-adjacent Podman (system quadlet, /etc/containers/systemd/)
• Wayland stack (labwc), CPU has AVX2 so no X11 fallback
• No GPU passthrough (DRINODE unset. Initializing Software Renderer (Pixman)), CPU H264 encoding

Additional context
Same exact GLib-GObject assertion signature as bambulab/BambuStudio#9217, #9450, #2479 (upstream GTK/GLib compatibility issue, not container-specific).

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[MarieFK59]

Found the actual root cause on my setup — it's SELinux, not Bambu Studio itself.

Host: Fedora CoreOS with SELinux enforcing, container running via a Podman system quadlet (container_t domain, no SecurityLabelDisable).

ausearch -m avc showed repeated denials at the exact time of the crash:

avc: denied { mount } for pid=... comm="bwrap" name="/" dev="devpts" ino=1 scontext=system_u:system_r:container_t:s0:c551,c674 tcontext=system_u:object_r:devpts_t:s0 tclass=filesystem permissive=0

bwrap (used by the sandboxed GTK4 glycin icon loader, and apparently something earlier in the Wayland/labwc startup path too) can't create the namespace/mount it needs under SELinux confinement, which cascades into GLib-GObject-CRITICAL: invalid (NULL) pointer instance right after Initializing StaticPrintConfigs, and the app exits with no window.

Fix: add --security-opt label=disable (or SecurityLabelDisable=true in a Podman quadlet) to run the container unconfined instead of under container_t. With that alone (no need to force X11 via PIXELFLUX_WAYLAND=false), Bambu Studio starts normally in native Wayland mode on my machine.

Tried both latest/02.08.01 and 02.08.00 — identical crash on both until the SELinux fix was applied, so this isn't a regression between those two builds. Might be worth a note in the docs for SELinux-enforcing hosts (Fedora, RHEL, CoreOS, etc.), since bwrap sandboxing + SELinux container confinement is a fairly common combination to hit.

[MarieFK59]

Closing as resolved on my end — root cause was SELinux confinement on the host (Fedora CoreOS), not an image bug. The comment above has the fix for anyone else hitting this on an SELinux-enforcing host.