================================
WARNING: inconsistent lock state
5.5.0-rc6-next-20200116-syzkaller #0 Not tainted
--------------------------------
inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.
ksoftirqd/1/15 [HC0[0]:SC1[1]:HE1:SE0] takes:
ffffffff8a03ce58 (ima_keys_lock){+.?.}, at: spin_lock include/linux/spinlock.h:338 [inline]
ffffffff8a03ce58 (ima_keys_lock){+.?.}, at: ima_process_queued_keys+0x4f/0x320 security/integrity/ima/ima_asymmetric_keys.c:144
{SOFTIRQ-ON-W} state was registered at:
  lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4484
  __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
  _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:151
  spin_lock include/linux/spinlock.h:338 [inline]
  ima_queue_key security/integrity/ima/ima_asymmetric_keys.c:111 [inline]
  ima_post_key_create_or_update+0x234/0x470 security/integrity/ima/ima_asymmetric_keys.c:194
  key_create_or_update+0x6b8/0xcb0 security/keys/key.c:944
  load_system_certificate_list+0x1ba/0x25e certs/system_keyring.c:161
  do_one_initcall+0x120/0x820 init/main.c:1109
  do_initcall_level init/main.c:1182 [inline]
  do_initcalls init/main.c:1198 [inline]
  do_basic_setup init/main.c:1218 [inline]
  kernel_init_freeable+0x522/0x5d0 init/main.c:1402
  kernel_init+0x12/0x1bf init/main.c:1309
  ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
irq event stamp: 53201954
hardirqs last  enabled at (53201954): [<ffffffff87ee0813>] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline]
hardirqs last  enabled at (53201954): [<ffffffff87ee0813>] _raw_spin_unlock_irq+0x23/0x80 kernel/locking/spinlock.c:199
hardirqs last disabled at (53201953): [<ffffffff87ee09fa>] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:126 [inline]
hardirqs last disabled at (53201953): [<ffffffff87ee09fa>] _raw_spin_lock_irq+0x3a/0x80 kernel/locking/spinlock.c:167
softirqs last  enabled at (53201446): [<ffffffff882006cd>] __do_softirq+0x6cd/0x98c kernel/softirq.c:319
softirqs last disabled at (53201451): [<ffffffff81479d3e>] run_ksoftirqd kernel/softirq.c:603 [inline]
softirqs last disabled at (53201451): [<ffffffff81479d3e>] run_ksoftirqd+0x8e/0x110 kernel/softirq.c:595

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(ima_keys_lock);
  <Interrupt>
    lock(ima_keys_lock);

 *** DEADLOCK ***

1 lock held by ksoftirqd/1/15:
 #0: ffffc90000d6fc00 ((&ima_key_queue_timer)){+.-.}, at: lockdep_copy_map include/linux/lockdep.h:172 [inline]
 #0: ffffc90000d6fc00 ((&ima_key_queue_timer)){+.-.}, at: call_timer_fn+0xe0/0x780 kernel/time/timer.c:1394

stack backtrace:
CPU: 1 PID: 15 Comm: ksoftirqd/1 Not tainted 5.5.0-rc6-next-20200116-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x197/0x210 lib/dump_stack.c:118
 print_usage_bug.cold+0x327/0x378 kernel/locking/lockdep.c:3100
 valid_state kernel/locking/lockdep.c:3111 [inline]
 mark_lock_irq kernel/locking/lockdep.c:3308 [inline]
 mark_lock+0xbb4/0x1220 kernel/locking/lockdep.c:3665
 mark_usage kernel/locking/lockdep.c:3565 [inline]
 __lock_acquire+0x1e8e/0x4a00 kernel/locking/lockdep.c:3908
 lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4484
 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:151
 spin_lock include/linux/spinlock.h:338 [inline]
 ima_process_queued_keys+0x4f/0x320 security/integrity/ima/ima_asymmetric_keys.c:144
 ima_timer_handler+0x15/0x20 security/integrity/ima/ima_asymmetric_keys.c:46
 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1404
 expire_timers kernel/time/timer.c:1449 [inline]
 __run_timers kernel/time/timer.c:1773 [inline]
 __run_timers kernel/time/timer.c:1740 [inline]
 run_timer_softirq+0x6c3/0x1790 kernel/time/timer.c:1786
 __do_softirq+0x262/0x98c kernel/softirq.c:292
 run_ksoftirqd kernel/softirq.c:603 [inline]
 run_ksoftirqd+0x8e/0x110 kernel/softirq.c:595
 smpboot_thread_fn+0x6a3/0xa40 kernel/smpboot.c:165
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352