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AppArmor WARN aa_sock_msg_perm: ((!sock)): 
WARNING: CPU: 1 PID: 18 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: 18 Comm: kworker/1:0 Not tainted 5.5.0-rc3-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
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 66 70 03 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 c6 c3 17 fe 48 c7 c6 e0 56 6a 88 48 c7 c7 20 41 6a 88 e8 22 6b e8 fd <0f> 0b e9 43 ff ff ff e8 a7 c3 17 fe 48 c7 c6 e0 56 6a 88 48 c7 c7
RSP: 0018:ffffc900004cf9b0 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815e8b56 RDI: fffff52000099f28
RBP: ffffc900004cf9d8 R08: ffff88802c6785c0 R09: fffffbfff1659bcc
R10: fffffbfff1659bcb R11: ffffffff8b2cde5f R12: ffffc900004cfb20
R13: ffffffff886a45c0 R14: 0000000000000002 R15: 000000000000001d
 apparmor_socket_sendmsg+0x2a/0x30 security/apparmor/lsm.c:949
 security_socket_sendmsg+0x77/0xc0 security/security.c:2013
 sock_sendmsg+0x45/0x130 net/socket.c:656
 kernel_sendmsg+0x44/0x50 net/socket.c:679
 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..