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AppArmor WARN aa_sock_msg_perm: ((!sock)): 
WARNING: CPU: 1 PID: 10480 at security/apparmor/lsm.c:933 aa_sock_msg_perm.isra.0+0xdd/0x170 security/apparmor/lsm.c:933
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 10480 Comm: kworker/1:5 Not tainted 5.5.0-rc2-next-20191220-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: krxrpcd rxrpc_peer_keepalive_worker
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x197/0x210 lib/dump_stack.c:118
 panic+0x2e3/0x75c kernel/panic.c:221
 __warn.cold+0x2f/0x3e kernel/panic.c:582
 report_bug+0x289/0x300 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:174 [inline]
 fixup_bug arch/x86/kernel/traps.c:169 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:267
 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:286
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
RIP: 0010:aa_sock_msg_perm.isra.0+0xdd/0x170 security/apparmor/lsm.c:933
Code: 89 ef e8 86 74 03 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 96 b1 16 fe 48 c7 c6 e0 74 6a 88 48 c7 c7 20 5f 6a 88 e8 b2 37 e7 fd <0f> 0b e9 43 ff ff ff e8 77 b1 16 fe 48 c7 c6 e0 74 6a 88 48 c7 c7
RSP: 0018:ffffc90007dff9b0 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815e9f66 RDI: fffff52000fbff28
RBP: ffffc90007dff9d8 R08: ffff88808b0d63c0 R09: fffffbfff165b7d2
R10: fffffbfff165b7d1 R11: ffffffff8b2dbe8f R12: ffffc90007dffb20
R13: ffffffff886a63c0 R14: 0000000000000002 R15: 000000000000001d
 apparmor_socket_sendmsg+0x2a/0x30 security/apparmor/lsm.c:949
 security_socket_sendmsg+0x77/0xc0 security/security.c:2069
 sock_sendmsg+0x45/0x130 net/socket.c:660
 kernel_sendmsg+0x44/0x50 net/socket.c:683
 rxrpc_send_keepalive+0x1ff/0x940 net/rxrpc/output.c:655
 rxrpc_peer_keepalive_dispatch net/rxrpc/peer_event.c:376 [inline]
 rxrpc_peer_keepalive_worker+0x7be/0xd02 net/rxrpc/peer_event.c:437
 process_one_work+0x9af/0x1740 kernel/workqueue.c:2264
 worker_thread+0x98/0xe40 kernel/workqueue.c:2410
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Kernel Offset: disabled
Rebooting in 86400 seconds..