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AppArmor WARN cred_label: ((!blob)): 
WARNING: CPU: 1 PID: 8974 at security/apparmor/include/cred.h:30 cred_label security/apparmor/include/cred.h:30 [inline]
WARNING: CPU: 1 PID: 8974 at security/apparmor/include/cred.h:30 apparmor_cred_free+0x12f/0x1a0 security/apparmor/lsm.c:62
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 8974 Comm: kworker/u4:7 Not tainted 5.0.0-rc2-next-20190115 #12
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_nc_worker
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1db/0x2d0 lib/dump_stack.c:113
 panic+0x2cb/0x65c kernel/panic.c:214
 __warn.cold+0x20/0x48 kernel/panic.c:571
 report_bug+0x263/0x2b0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 fixup_bug arch/x86/kernel/traps.c:173 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:290
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973
RIP: 0010:cred_label security/apparmor/include/cred.h:30 [inline]
RIP: 0010:apparmor_cred_free+0x12f/0x1a0 security/apparmor/lsm.c:62
Code: 7c 88 48 c7 c7 40 d2 7c 88 e8 5d 69 f2 fd 0f 0b eb a9 e8 64 40 29 fe 48 c7 c6 00 e2 7c 88 48 c7 c7 40 d2 7c 88 e8 41 69 f2 fd <0f> 0b 48 b8 00 00 00 00 00 fc ff df 80 38 00 75 4a 4c 8b 2c 25 00
RSP: 0018:ffff8880ae7079f8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000100 RSI: ffffffff81688726 RDI: 0000000000000006
RBP: ffff8880ae707a18 R08: ffff88804bc6c2c0 R09: ffff88804bc6cb88
R10: ffff88804bc6c2c0 R11: 0000000000000000 R12: ffff888090416c00
R13: ffff888090416c00 R14: ffff888090416c88 R15: dffffc0000000000
 security_cred_free+0x4b/0xf0 security/security.c:1490
 put_cred_rcu+0x21f/0x6e0 kernel/cred.c:118
 __rcu_reclaim kernel/rcu/rcu.h:240 [inline]
 rcu_do_batch kernel/rcu/tree.c:2486 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2799 [inline]
 rcu_core+0xc4a/0x1680 kernel/rcu/tree.c:2780
 __do_softirq+0x30b/0xb11 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x180/0x1d0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0x1b7/0x760 arch/x86/kernel/apic/apic.c:1062
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:766 [inline]
RIP: 0010:lock_acquire+0x259/0x570 kernel/locking/lockdep.c:3863
Code: 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 64 02 00 00 48 83 3d 56 03 2e 08 00 0f 84 d0 01 00 00 48 8b bd 48 ff ff ff 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 03 85 40 ff ff ff
RSP: 0018:ffff88804bc777d0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff1325076 RBX: ffff88804bc6c2c0 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000282
RBP: ffff88804bc778a0 R08: 0000000000000002 R09: ffff88804bc6cbb0
R10: ffff88804bc6cb90 R11: 0000000000000001 R12: ffffffff899a45c0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000002
 rcu_lock_acquire include/linux/rcupdate.h:223 [inline]
 rcu_read_lock include/linux/rcupdate.h:608 [inline]
 batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:419 [inline]
 batadv_nc_worker+0x19b/0x920 net/batman-adv/network-coding.c:730
 process_one_work+0xd0c/0x1ce0 kernel/workqueue.c:2153
 worker_thread+0x143/0x14a0 kernel/workqueue.c:2296
 kthread+0x357/0x430 kernel/kthread.c:247
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Kernel Offset: disabled
Rebooting in 86400 seconds..