WARNING: CPU: 5 PID: 22540 at /var/build/temp/tmp.fGR9UKeomO/pbuilder/linux-4.1.6/lib/list_debug.c:33 __list_add+0xc0/0xd0()
list_add corruption. prev->next should be next (ffff88021fd4fce8), but was           (null). (prev=ffff8800da45e3c8).
Modules linked in: cpuid ppdev lp xt_addrtype xt_conntrack ipt_MASQUERADE nf_nat_masquerade_ipv4 bridge stp llc overlay ip6t_REJECT nf_reject_ipv6 ipt_REJECT nf_reject_ipv4 xt_tcpudp nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_mangle ip6table_filter ip6_tables xt_state iptable_mangle iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_filter ip_tables x_tables rpcsec_gss_krb5 nfsd auth_rpcgss nfs_acl nfs lockd grace fscache sunrpc quota_v2 quota_tree acpi_cpufreq processor psmouse virtio_balloon i2c_piix4 parport_pc pcspkr 8250_fintek parport serio_raw thermal_sys joydev evdev ext4 crc16 mbcache jbd2 dm_snapshot dm_bufio dm_mirror dm_region_hash dm_log dm_mod hid_generic usbhid hid sg sr_mod cdrom ata_generic virtio_blk virtio_net floppy ata_piix ttm libata drm_kms_helper uhci_hcd drm virtio_pci ehci_hcd virtio_ring scsi_mod usbcore virtio button usb_common
CPU: 5 PID: 22540 Comm: kworker/u12:0 Not tainted 4.1.0-ucs190-amd64 #1 Debian 4.1.6-1.190.201604142226
Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007
Workqueue: dm_bufio_cache work_fn [dm_bufio]
 0000000000000000 ffffffff817531c0 ffffffff81597807 ffff8801000fbd28
 ffffffff81076c45 ffffffffa00a4380 ffff88021fd4fce8 ffff8800da45e3c8
 0000000000000086 000000016d1a7bdb ffffffff81076d4a ffffffff81753310
Call Trace:
 [<ffffffff81597807>] ? dump_stack+0x40/0x50
 [<ffffffff81076c45>] ? warn_slowpath_common+0x95/0xe0
 [<ffffffff81076d4a>] ? warn_slowpath_fmt+0x4a/0x50
 [<ffffffff8130be50>] ? __list_add+0xc0/0xd0
 [<ffffffff810da5a6>] ? internal_add_timer+0x36/0xa0
 [<ffffffff810dc42b>] ? add_timer_on+0x8b/0x100
 [<ffffffff8108d963>] ? queue_delayed_work_on+0x23/0x50
 [<ffffffff8108ee74>] ? process_one_work+0x144/0x3f0
 [<ffffffff8108f61f>] ? worker_thread+0x10f/0x510
 [<ffffffff8108f510>] ? rescuer_thread+0x3b0/0x3b0
 [<ffffffff81095801>] ? kthread+0xc1/0xe0
 [<ffffffff81095740>] ? flush_kthread_worker+0x70/0x70
 [<ffffffff8159e2b2>] ? ret_from_fork+0x42/0x70
 [<ffffffff81095740>] ? flush_kthread_worker+0x70/0x70