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AppArmor WARN cred_label: ((!blob)): 
WARNING: CPU: 0 PID: 3866 at security/apparmor/include/cred.h:30 cred_label security/apparmor/include/cred.h:30 [inline]
WARNING: CPU: 0 PID: 3866 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: 0 PID: 3866 Comm: udevd Not tainted 5.0.0-rc2-next-20190115 #12
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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:ffff8880ae6079f8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000100 RSI: ffffffff81688726 RDI: 0000000000000006
RBP: ffff8880ae607a18 R08: ffff888097ebc280 R09: ffff888097ebcb20
R10: ffff888097ebc280 R11: 0000000000000000 R12: ffff88808d2bf300
R13: ffff88808d2bf300 R14: ffff88808d2bf388 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:__raw_write_unlock_irq include/linux/rwlock_api_smp.h:268 [inline]
RIP: 0010:_raw_write_unlock_irq+0x54/0x90 kernel/locking/spinlock.c:336
Code: c0 c0 83 92 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 33 48 83 3d e5 4c 9c 01 00 74 20 fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 72 0f 62 f9 65 8b 05 db b6 0b 78 85 c0 74 06 41
RSP: 0018:ffff888097ec78a8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff1325078 RBX: 1ffff11012fd8f50 RCX: 1ffff11012fd7964
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff888097ebcafc
RBP: ffff888097ec78b0 R08: 0000000000000006 R09: ffff888097ebcb20
R10: ffff888097ebc280 R11: 0000000000000000 R12: ffff888097cb76a0
R13: ffff888097cb7680 R14: ffff888097cb7680 R15: dffffc0000000000
 ep_scan_ready_list+0xc14/0x10b0 fs/eventpoll.c:757
 ep_send_events fs/eventpoll.c:1798 [inline]
 ep_poll+0x2d0/0x1640 fs/eventpoll.c:1935
 do_epoll_wait+0x1b3/0x200 fs/eventpoll.c:2299
 __do_sys_epoll_wait fs/eventpoll.c:2309 [inline]
 __se_sys_epoll_wait fs/eventpoll.c:2306 [inline]
 __x64_sys_epoll_wait+0x97/0xf0 fs/eventpoll.c:2306
 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f36b092b943
Code: 00 31 d2 48 29 c2 64 89 11 48 83 c8 ff eb ea 90 90 90 90 90 90 90 90 83 3d b5 dc 2a 00 00 75 13 49 89 ca b8 e8 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 34 c3 48 83 ec 08 e8 3b c4 00 00 48 89 04 24
RSP: 002b:00007ffe1e854048 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8
RAX: ffffffffffffffda RBX: 0000000000000bb8 RCX: 00007f36b092b943
RDX: 0000000000000008 RSI: 00007ffe1e854140 RDI: 000000000000000a
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000bb8 R11: 0000000000000246 R12: 0000000000000003
R13: 0000000000000000 R14: 0000000001c64830 R15: 0000000001c56250
Kernel Offset: disabled
Rebooting in 86400 seconds..