================================ WARNING: inconsistent lock state 5.10.0-rc4-syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. kworker/1:3/8675 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff888140dd94a8 (&file_data->lock){+.?.}-{2:2}, at: spin_lock include/linux/spinlock.h:354 [inline] ffff888140dd94a8 (&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:5435 __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:9660 [inline] __do_sys_io_uring_register fs/io_uring.c:9750 [inline] __se_sys_io_uring_register+0x3aee/0x3f90 fs/io_uring.c:9732 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 irq event stamp: 40498 hardirqs last enabled at (40498): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (40498): [] _raw_spin_unlock_irqrestore+0x2e/0x60 kernel/locking/spinlock.c:191 hardirqs last disabled at (40497): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (40497): [] _raw_spin_lock_irqsave+0x4d/0xa0 kernel/locking/spinlock.c:159 softirqs last enabled at (40390): [] local_bh_enable+0x5/0x20 include/linux/bottom_half.h:31 softirqs last disabled at (40393): [] 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 *** 4 locks held by kworker/1:3/8675: #0: ffff888010464d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x6f4/0xfc0 kernel/workqueue.c:2245 #1: ffffc90001b6fd80 ((work_completion)(&w->work)#2){+.+.}-{0:0}, at: process_one_work+0x733/0xfc0 kernel/workqueue.c:2247 #2: ffffffff8bce6980 (rcu_callback){....}-{0:0}, at: rcu_lock_acquire+0x0/0x20 kernel/rcu/tree.c:1365 #3: ffffffff8bce68c0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:247 stack backtrace: CPU: 1 PID: 8675 Comm: kworker/1:3 Not tainted 5.10.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events iterate_cleanup_work Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x137/0x1be lib/dump_stack.c:118 print_usage_bug+0xc08/0x1090 kernel/locking/lockdep.c:3738 mark_lock_irq kernel/locking/lockdep.c:3749 [inline] mark_lock+0x1953/0x20e0 kernel/locking/lockdep.c:4409 mark_usage kernel/locking/lockdep.c:4304 [inline] __lock_acquire+0xbff/0x6210 kernel/locking/lockdep.c:4784 lock_acquire+0x114/0x5e0 kernel/locking/lockdep.c:5435 __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:2476 [inline] rcu_core+0x79b/0x10b0 kernel/rcu/tree.c:2711 __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:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 RIP: 0010:should_resched arch/x86/include/asm/preempt.h:102 [inline] RIP: 0010:__local_bh_enable_ip+0xfe/0x170 kernel/softirq.c:202 Code: 89 e8 66 9e f7 07 65 66 8b 05 7e af bc 7e 66 85 c0 75 41 bf 01 00 00 00 e8 1f 34 09 00 e8 2a 74 34 00 fb 65 8b 05 6e 64 bb 7e <85> c0 75 05 e8 10 c1 b9 ff 65 48 8b 04 25 28 00 00 00 48 3b 44 24 RSP: 0018:ffffc90001b6fbb0 EFLAGS: 00000282 RAX: 0000000080000000 RBX: 00000000000001ff RCX: ffffffff81599766 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff888021893668 R08: dffffc0000000000 R09: fffffbfff1dd427b R10: fffffbfff1dd427b R11: 0000000000000000 R12: dffffc0000000000 R13: 00000000000026cd R14: ffffffff87c11c35 R15: dffffc0000000000 get_next_corpse net/netfilter/nf_conntrack_core.c:2221 [inline] nf_ct_iterate_cleanup+0x427/0x4d0 net/netfilter/nf_conntrack_core.c:2244 nf_ct_iterate_cleanup_net+0xfc/0x150 net/netfilter/nf_conntrack_core.c:2329 iterate_cleanup_work+0x4c/0x100 net/netfilter/nf_nat_masquerade.c:216 process_one_work+0x789/0xfc0 kernel/workqueue.c:2272 worker_thread+0xaa4/0x1460 kernel/workqueue.c:2418 kthread+0x36b/0x390 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296