#5:  (tasklist_lock){.+.+}, at: [<ffffffff81546333>] debug_show_all_locks+0xd3/0x400 kernel/locking/lockdep.c:4552

=============================================

BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 30s!
Showing busy workqueues and worker pools:
workqueue events: flags=0x0
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=3/256
    in-flight: 17:console_callback
    pending: perf_sched_delayed, cache_reap
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=2/256
    pending: vmstat_shepherd, cache_reap
workqueue events_long: flags=0x0
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
    pending: gc_worker
workqueue events_power_efficient: flags=0x80
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=3/256
    pending: reg_check_chans_work, neigh_periodic_work, neigh_periodic_work
workqueue mm_percpu_wq: flags=0x8
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256
    pending: vmstat_update
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
    pending: vmstat_update
workqueue writeback: flags=0x4e
  pwq 4: cpus=0-1 flags=0x4 nice=0 active=2/256
    pending: wb_workfn, wb_workfn
workqueue kblockd: flags=0x18
  pwq 1: cpus=0 node=0 flags=0x0 nice=-20 active=2/256
    pending: blk_mq_timeout_work, blk_mq_timeout_work
pool 2: cpus=1 node=0 flags=0x0 nice=0 hung=0s workers=5 idle: 1272 4822 4818 24
audit: type=1326 audit(1506953090.423:22): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=10765 comm="syz-executor7" exe="/root/syz-executor7" sig=31 arch=40000003 syscall=240 compat=1 ip=0xf7f39c79 code=0xffff0000
device syz2 left promiscuous mode
device syz2 entered promiscuous mode
device syz2 left promiscuous mode
audit: type=1326 audit(1506953090.527:23): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=10765 comm="syz-executor7" exe="/root/syz-executor7" sig=31 arch=40000003 syscall=240 compat=1 ip=0xf7f39c79 code=0xffff0000
device syz2 entered promiscuous mode
device gre0 entered promiscuous mode
QAT: Invalid ioctl
QAT: Invalid ioctl
sctp: [Deprecated]: syz-executor2 (pid 10870) Use of struct sctp_assoc_value in delayed_ack socket option.
Use struct sctp_sack_info instead
device gre0 entered promiscuous mode
sctp: [Deprecated]: syz-executor2 (pid 10876) Use of struct sctp_assoc_value in delayed_ack socket option.
Use struct sctp_sack_info instead
netlink: 13 bytes leftover after parsing attributes in process `syz-executor0'.
netlink: 13 bytes leftover after parsing attributes in process `syz-executor0'.
sctp: [Deprecated]: syz-executor1 (pid 11133) Use of int in max_burst socket option.
Use struct sctp_assoc_value instead
sctp: [Deprecated]: syz-executor1 (pid 11133) Use of int in max_burst socket option.
Use struct sctp_assoc_value instead
device gre0 entered promiscuous mode
device gre0 left promiscuous mode
device gre0 entered promiscuous mode
device gre0 left promiscuous mode
QAT: Invalid ioctl
QAT: Invalid ioctl
netlink: 4 bytes leftover after parsing attributes in process `syz-executor2'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor2'.
netlink: 5 bytes leftover after parsing attributes in process `syz-executor2'.
netlink: 5 bytes leftover after parsing attributes in process `syz-executor2'.
QAT: Invalid ioctl
QAT: Invalid ioctl
QAT: Invalid ioctl
QAT: Invalid ioctl
?: renamed from sit0
netlink: 1 bytes leftover after parsing attributes in process `syz-executor3'.
device gre0 entered promiscuous mode
netlink: 1 bytes leftover after parsing attributes in process `syz-executor3'.
QAT: Invalid ioctl
QAT: Invalid ioctl
netlink: 21 bytes leftover after parsing attributes in process `syz-executor7'.
netlink: 21 bytes leftover after parsing attributes in process `syz-executor7'.
QAT: Invalid ioctl
QAT: Invalid ioctl
selinux_nlmsg_perm: 1 callbacks suppressed
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=52941 sclass=netlink_route_socket pig=11867 comm=syz-executor4
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=52941 sclass=netlink_route_socket pig=11867 comm=syz-executor4
devpts: called with bogus options
devpts: called with bogus options
dccp_invalid_packet: P.Data Offset(66) too large
nla_parse: 2 callbacks suppressed
netlink: 11 bytes leftover after parsing attributes in process `syz-executor4'.
netlink: 11 bytes leftover after parsing attributes in process `syz-executor4'.
QAT: Invalid ioctl
QAT: Invalid ioctl
ptm ptm1: ldisc open failed (-12), clearing slot 1
QAT: Invalid ioctl
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 PID: 12455 Comm: syz-executor5 Not tainted 4.14.0-rc3+ #22
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:16 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:52
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail+0x8c0/0xa40 lib/fault-inject.c:149