A VM regression test caught that btrfs-assistant 2.2 segfaults on launch
inside libbtrfsutil.so.1.4.0 -- a library ABI mismatch in nixpkgs 26.05, not
a GL/VM artifact (crashes with software GL and every Qt platform; the fault
is in a btrfs library). The snapshot menu wiring is correct and the app is
installed, but the GUI doesn't open. The snapshot backend is unaffected and
is itself VM-verified (full BTRFS+LUKS install: root+home snapper configs, a
/home timeline snapshot, /home/.snapshots a real subvolume, the oneshot
Result=success). Keep the entry, document the bug pending a nixpkgs fix.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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