[    6.383721] nf_conntrack version 0.5.0 (7932 buckets, 31728 max)
[    6.744240] init: plymouth-upstart-bridge main process (208) killed by TERM signal
[    9.736073] xenbus_probe_frontend: Waiting for devices to initialise: 25s...20s...15s...10s...5s...0s...
[   34.736074] 
[   34.736486] xenbus_probe_frontend: Timeout connecting to device: device/vfb/0 (local state 3, remote state 1)
[  318.815300] IPv6: ADDRCONF(NETDEV_UP): vethIU53YK: link is not ready
[  318.815433] device vethIU53YK entered promiscuous mode
[  318.815455] lxcbr0: port 1(vethIU53YK) entered forwarding state
[  318.815458] lxcbr0: port 1(vethIU53YK) entered forwarding state
[  318.820225] eth0: renamed from vethIU53YKp
[  318.820464] lxcbr0: port 1(vethIU53YK) entered disabled state
[  318.843322] overlayfs: missing upperdir or lowerdir or workdir
[  318.848664] IPv6: ADDRCONF(NETDEV_CHANGE): vethIU53YK: link becomes ready
[  318.848680] lxcbr0: port 1(vethIU53YK) entered forwarding state
[  318.848683] lxcbr0: port 1(vethIU53YK) entered forwarding state
[  326.343011] overlayfs: ERROR - failed to whiteout '#ffff88003c7cf780'
[  326.346549] BUG: unable to handle kernel NULL pointer dereference at 0000000000000057
[  326.350523] IP: [<ffffffff813b468c>] lockref_put_or_lock+0xc/0x90
[  326.350523] PGD 3a3bc067 PUD 3d619067 PMD 0 
[  326.350523] Oops: 0000 [#1] SMP 
[  326.350523] Modules linked in: overlay veth xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack xt_tcpudp bridge stp llc iptable_filter ip_tables x_tables dm_crypt ppdev xen_fbfront fb_sys_fops i2c_piix4 serio_raw parport_pc 8250_fintek parport mac_hid isofs crct10dif_pclmul crc32_pclmul ghash_clmulni_intel cirrus syscopyarea sysfillrect sysimgblt ttm drm_kms_helper aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd drm psmouse pata_acpi floppy
[  326.350523] CPU: 0 PID: 1801 Comm: apt-get Tainted: G         C     3.19.0-26-generic #28~14.04.1-Ubuntu
[  326.350523] Hardware name: Xen HVM domU, BIOS 4.2.amazon 05/06/2015
[  326.350523] task: ffff880035fc2740 ti: ffff88003cf10000 task.ti: ffff88003cf10000
[  326.350523] RIP: 0010:[<ffffffff813b468c>]  [<ffffffff813b468c>] lockref_put_or_lock+0xc/0x90
[  326.350523] RSP: 0018:ffff88003cf13c08  EFLAGS: 00010292
[  326.350523] RAX: 0000000000000006 RBX: 0000000000000057 RCX: 0000000100060006
[  326.350523] RDX: 000000000000305f RSI: ffff88003c792e00 RDI: 0000000000000057
[  326.350523] RBP: ffff88003cf13c18 R08: 0000000000000000 R09: 0000000000000018
[  326.350523] R10: 0000000000000000 R11: 0000000000aaaaaa R12: 0000000000000057
[  326.350523] R13: ffff88003c7b7e40 R14: ffffffffffffffff R15: 0000000000000000
[  326.350523] FS:  00007f0aabbb0780(0000) GS:ffff88003fc00000(0000) knlGS:0000000000000000
[  326.350523] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  326.350523] CR2: 0000000000000057 CR3: 0000000039206000 CR4: 00000000001406f0
[  326.350523] Stack:
[  326.350523]  ffff88003c7b7e40 ffffffffffffffff ffff88003cf13c48 ffffffff81203434
[  326.350523]  ffff88003c7cf780 ffff88003c5e2180 ffff88003c7b7e40 ffffffffffffffff
[  326.350523]  ffff88003cf13cf8 ffffffffc02e9de9 0000000000000000 ffff88003c78cd50
[  326.350523] Call Trace:
[  326.350523]  [<ffffffff81203434>] dput+0x24/0x170
[  326.350523]  [<ffffffffc02e9de9>] ovl_rename2+0x7c9/0x970 [overlay]
[  326.350523]  [<ffffffff811f8967>] vfs_rename+0x4e7/0x7b0
[  326.350523]  [<ffffffff811fd19a>] SYSC_renameat2+0x53a/0x5e0
[  326.350523]  [<ffffffff811fd481>] ? user_path_at+0x11/0x20
[  326.350523]  [<ffffffff811f12d0>] ? vfs_fstatat+0x50/0xa0
[  326.350523]  [<ffffffff811ecf2e>] ? vfs_read+0x11e/0x140
[  326.350523]  [<ffffffff811ecf96>] ? SyS_read+0x46/0xb0
[  326.350523]  [<ffffffff811fe48e>] SyS_rename+0x1e/0x20
[  326.350523]  [<ffffffff817b688d>] system_call_fastpath+0x16/0x1b
[  326.350523] Code: 48 c7 c2 b1 5b ad 81 be 07 00 00 00 48 c7 c7 b0 62 ad 81 31 c0 48 89 e5 e8 42 07 cc ff 5d c3 55 48 89 e5 53 48 89 fb 48 83 ec 08 <48> 8b 0f 48 89 c8 48 c1 e8 10 31 c8 a9 fe ff 00 00 75 31 48 89 
[  326.350523] RIP  [<ffffffff813b468c>] lockref_put_or_lock+0xc/0x90
[  326.350523]  RSP <ffff88003cf13c08>
[  326.350523] CR2: 0000000000000057
[  326.503950] ---[ end trace bb48d0bd2d73d996 ]---
[  333.856078] lxcbr0: port 1(vethIU53YK) entered forwarding state