Just tried 4.18.0-02978-g1eb46908b35d on a sparc64 box with Debian Ports sparc64 unstable (apparmor packages recommended by linux-image package) and got the following on bootup:
[ 46.315721] Kernel unaligned access at TPC[6b8b98] aa_dfa_unpack+0x38/0x620 [ 46.412375] Kernel unaligned access at TPC[6b8ba8] aa_dfa_unpack+0x48/0x620 [ 46.412392] Kernel unaligned access at TPC[6b8c28] aa_dfa_unpack+0xc8/0x620 [ 46.698283] Kernel unaligned access at TPC[6b8ce8] aa_dfa_unpack+0x188/0x620 [ 46.789536] Kernel unaligned access at TPC[6b8cfc] aa_dfa_unpack+0x19c/0x620 -- Meelis Roos (mr...@linux.ee)