================================
WARNING: inconsistent lock state
5.5.0-rc6-next-20200116-syzkaller #0 Not tainted
--------------------------------
inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.
kworker/u4:2/100 [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: 8280672
hardirqs last enabled at (8280672): [<ffffffff81006ac3>] trace_hardirqs_on_thunk+0x1a/0x1c arch/x86/entry/thunk_64.S:41
hardirqs last disabled at (8280671): [<ffffffff81006adf>] trace_hardirqs_off_thunk+0x1a/0x1c arch/x86/entry/thunk_64.S:42
softirqs last enabled at (8280664): [<ffffffff87cf9855>] spin_unlock_bh include/linux/spinlock.h:383 [inline]
softirqs last enabled at (8280664): [<ffffffff87cf9855>] batadv_nc_purge_paths+0x265/0x370 net/batman-adv/network-coding.c:470
softirqs last disabled at (8280667): [<ffffffff8147a05b>] invoke_softirq kernel/softirq.c:373 [inline]
softirqs last disabled at (8280667): [<ffffffff8147a05b>] irq_exit+0x19b/0x1e0 kernel/softirq.c:413
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(ima_keys_lock);
<Interrupt>
lock(ima_keys_lock);
*** DEADLOCK ***
3 locks held by kworker/u4:2/100:
#0: ffff888215393128 ((wq_completion)bat_events){+.+.}, at: __write_once_size include/linux/compiler.h:250 [inline]
#0: ffff888215393128 ((wq_completion)bat_events){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff888215393128 ((wq_completion)bat_events){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:869 [inline]
#0: ffff888215393128 ((wq_completion)bat_events){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
#0: ffff888215393128 ((wq_completion)bat_events){+.+.}, at: set_work_data kernel/workqueue.c:615 [inline]
#0: ffff888215393128 ((wq_completion)bat_events){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline]
#0: ffff888215393128 ((wq_completion)bat_events){+.+.}, at: process_one_work+0x8dd/0x17a0 kernel/workqueue.c:2235
#1: ffffc90001227dc0 ((work_completion)(&(&bat_priv->nc.work)->work)){+.+.}, at: process_one_work+0x917/0x17a0 kernel/workqueue.c:2239
#2: ffffc90000d98d50 ((&ima_key_queue_timer)){+.-.}, at: lockdep_copy_map include/linux/lockdep.h:172 [inline]
#2: ffffc90000d98d50 ((&ima_key_queue_timer)){+.-.}, at: call_timer_fn+0xe0/0x780 kernel/time/timer.c:1394
stack backtrace:
CPU: 1 PID: 100 Comm: kworker/u4:2 Not tainted 5.5.0-rc6-next-20200116-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_nc_worker
Call Trace:
<IRQ>
__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
invoke_softirq kernel/softirq.c:373 [inline]
irq_exit+0x19b/0x1e0 kernel/softirq.c:413
exiting_irq arch/x86/include/asm/apic.h:536 [inline]
smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1137
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
</IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:752 [inline]
RIP: 0010:lock_release+0x4c0/0x960 kernel/locking/lockdep.c:4505
Code: 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 8c 03 00 00 48 83 3d f7 83 58 08 00 0f 84 7f 01 00 00 48 8b bd 48 ff ff ff 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 01 c3 48 c7 03 00
RSP: 0018:ffffc90001227b78 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff136774f RBX: 1ffff92000244f74 RCX: 1ffff110152079d2
RDX: dffffc0000000000 RSI: 1ffff110152079de RDI: 0000000000000286
RBP: ffffc90001227c48 R08: 0000000000000003 R09: ffff8880a903ce98
R10: fffffbfff154a5c8 R11: ffffffff8aa52e47 R12: ffff8880a903c600
R13: ffffffff87cfe9fc R14: ffffc90001227c20 R15: ffff8880a903c600
rcu_lock_release include/linux/rcupdate.h:213 [inline]
rcu_read_unlock include/linux/rcupdate.h:655 [inline]
batadv_nc_process_nc_paths.part.0+0x26e/0x3c0 net/batman-adv/network-coding.c:698
batadv_nc_process_nc_paths net/batman-adv/network-coding.c:678 [inline]
batadv_nc_worker+0x54b/0x760 net/batman-adv/network-coding.c:727
process_one_work+0xa05/0x17a0 kernel/workqueue.c:2264
worker_thread+0x98/0xe40 kernel/workqueue.c:2410
kthread+0x361/0x430 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352