================================ WARNING: inconsistent lock state 5.10.0-syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. kworker/u4:3/107 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff88801d8c0ca8 (&file_data->lock){+.?.}-{2:2}, at: spin_lock include/linux/spinlock.h:354 [inline] ffff88801d8c0ca8 (&file_data->lock){+.?.}-{2:2}, at: io_file_data_ref_zero+0x6a/0x3a0 fs/io_uring.c:7361 {SOFTIRQ-ON-W} state was registered at: lock_acquire+0x114/0x5e0 kernel/locking/lockdep.c:5437 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:354 [inline] io_sqe_files_register fs/io_uring.c:7496 [inline] __io_uring_register fs/io_uring.c:9665 [inline] __do_sys_io_uring_register fs/io_uring.c:9755 [inline] __se_sys_io_uring_register+0x3b2c/0x3fe0 fs/io_uring.c:9737 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 irq event stamp: 317866 hardirqs last enabled at (317866): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (317866): [] _raw_spin_unlock_irqrestore+0x2e/0x60 kernel/locking/spinlock.c:191 hardirqs last disabled at (317865): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (317865): [] _raw_spin_lock_irqsave+0x4d/0xa0 kernel/locking/spinlock.c:159 softirqs last enabled at (317762): [] spin_unlock_bh include/linux/spinlock.h:399 [inline] softirqs last enabled at (317762): [] batadv_nc_purge_paths+0x35f/0x3f0 net/batman-adv/network-coding.c:470 softirqs last disabled at (317769): [] asm_call_irq_on_stack+0xf/0x20 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&file_data->lock); lock(&file_data->lock); *** DEADLOCK *** 5 locks held by kworker/u4:3/107: #0: ffff8881479ab938 ((wq_completion)bat_events){+.+.}-{0:0}, at: process_one_work+0x6f4/0xfc0 kernel/workqueue.c:2245 #1: ffffc9000123fd78 ((work_completion)(&(&bat_priv->nc.work)->work)){+.+.}-{0:0}, at: process_one_work+0x733/0xfc0 kernel/workqueue.c:2247 #2: ffffffff8bce7ac0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:252 #3: ffffffff8bce7b80 (rcu_callback){....}-{0:0}, at: rcu_lock_acquire+0x0/0x20 kernel/rcu/tree.c:1374 #4: ffffffff8bce7ac0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:252 stack backtrace: CPU: 0 PID: 107 Comm: kworker/u4:3 Not tainted 5.10.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x137/0x1be lib/dump_stack.c:120 print_usage_bug+0xbfe/0x1080 kernel/locking/lockdep.c:3740 mark_lock_irq kernel/locking/lockdep.c:3751 [inline] mark_lock+0x182d/0x1ef0 kernel/locking/lockdep.c:4411 mark_usage kernel/locking/lockdep.c:4306 [inline] __lock_acquire+0xbe6/0x5e90 kernel/locking/lockdep.c:4786 lock_acquire+0x114/0x5e0 kernel/locking/lockdep.c:5437 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:354 [inline] io_file_data_ref_zero+0x6a/0x3a0 fs/io_uring.c:7361 percpu_ref_put_many include/linux/percpu-refcount.h:322 [inline] percpu_ref_put+0x1cb/0x1d0 include/linux/percpu-refcount.h:338 rcu_do_batch kernel/rcu/tree.c:2489 [inline] rcu_core+0x7db/0x10c0 kernel/rcu/tree.c:2723 __do_softirq+0x307/0x6be kernel/softirq.c:298 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x9a/0xe0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu+0x1d6/0x200 kernel/softirq.c:423 irq_exit_rcu+0x5/0x20 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0xe0/0xf0 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628 RIP: 0010:trace_lock_release+0x39/0x140 include/trace/events/lock.h:58 Code: a8 7e 83 f8 08 73 7d 89 c3 48 89 d8 48 c1 e8 06 48 8d 3c c5 28 5d 0e 8d be 08 00 00 00 e8 cf c2 5d 00 48 0f a3 1d df d2 b4 0b <73> 52 65 83 05 39 65 a8 7e 01 48 8b 05 76 32 a2 0b e8 51 62 e5 07 RSP: 0018:ffffc9000123fbd0 EFLAGS: 00000257 RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff81598a41 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8d0e5d28 RBP: ffffffff8921aa15 R08: dffffc0000000000 R09: fffffbfff1a1cba6 R10: fffffbfff1a1cba6 R11: 0000000000000000 R12: dffffc0000000000 R13: ffff88807e904000 R14: ffff888020dbf790 R15: ffffffff8bce7ac0 lock_release+0x27/0x6b0 kernel/locking/lockdep.c:5448 rcu_read_unlock include/linux/rcupdate.h:696 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:411 [inline] batadv_nc_worker+0x261/0x5c0 net/batman-adv/network-coding.c:718 process_one_work+0x789/0xfc0 kernel/workqueue.c:2272 worker_thread+0xaa4/0x1460 kernel/workqueue.c:2418 kthread+0x39a/0x3c0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 hrtimer: interrupt took 49638 ns