It looks like the same issue happens with "kill" syscall:
Jul 01 15:52:45 kernel: audit: type=1400 audit(1719849165.951:291): apparmor="DENIED" operation="signal" class="signal" profile="lxd-v1_</var/snap/lxd/common/lxd>" pid=15369 comm="lxd" requested_mask="receive" denied_mask="receive" signal=kill peer="snap.lxd.daemon"
this started to appear after LXD was enabled to use unconfined profile mode.
It looks like the same issue happens with "kill" syscall:
Jul 01 15:52:45 kernel: audit: type=1400 audit(171984916 5.951:291) : apparmor="DENIED" operation="signal" class="signal" profile= "lxd-v1_ </var/snap/ lxd/common/ lxd>" pid=15369 comm="lxd" requested_ mask="receive" denied_ mask="receive" signal=kill peer="snap. lxd.daemon"
this started to appear after LXD was enabled to use unconfined profile mode.