================================ WARNING: inconsistent lock state 5.10.0-rc4-syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor.5/32156 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff8880577902a8 (&file_data->lock){+.?.}-{2:2}, at: spin_lock include/linux/spinlock.h:354 [inline] ffff8880577902a8 (&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: 6612 hardirqs last enabled at (6612): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (6612): [] _raw_spin_unlock_irqrestore+0x2e/0x60 kernel/locking/spinlock.c:191 hardirqs last disabled at (6611): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (6611): [] _raw_spin_lock_irqsave+0x4d/0xa0 kernel/locking/spinlock.c:159 softirqs last enabled at (4648): [] local_bh_enable+0x5/0x20 include/linux/bottom_half.h:31 softirqs last disabled at (6589): [] 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 *** 2 locks held by syz-executor.5/32156: #0: ffffffff8bce6980 (rcu_callback){....}-{0:0}, at: rcu_lock_acquire+0x0/0x20 kernel/rcu/tree.c:1365 #1: ffffffff8bce68c0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:247 stack backtrace: CPU: 0 PID: 32156 Comm: syz-executor.5 Not tainted 5.10.0-rc4-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+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:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:199 Code: 0f 1f 44 00 00 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 9e e6 18 f8 48 89 df e8 d6 ad 1a f8 e8 b1 9d 3a f8 fb bf 01 00 00 00 96 5d 0f f8 65 8b 05 eb 8d c1 76 85 c0 74 02 5b c3 e8 8b ea bf RSP: 0018:ffffc9000991fc88 EFLAGS: 00000282 RAX: 67d61ac04176d100 RBX: ffff8880b9c34440 RCX: ffffffff8f4f2903 RDX: 0000000040000000 RSI: 0000000000000002 RDI: 0000000000000001 RBP: ffffc9000991fce8 R08: ffffffff817aff70 R09: ffffed1017386889 R10: ffffed1017386889 R11: 0000000000000000 R12: ffff8880b9c34440 R13: ffff888055423480 R14: dffffc0000000000 R15: 0000000000000000 finish_task_switch+0x140/0x5b0 kernel/sched/core.c:3613 context_switch kernel/sched/core.c:3777 [inline] __schedule+0x934/0xcb0 kernel/sched/core.c:4523 schedule+0x14b/0x200 kernel/sched/core.c:4601 freezable_schedule include/linux/freezer.h:172 [inline] do_nanosleep+0x1ae/0x680 kernel/time/hrtimer.c:1878 hrtimer_nanosleep+0x1b9/0x350 kernel/time/hrtimer.c:1931 __do_sys_nanosleep kernel/time/hrtimer.c:1965 [inline] __se_sys_nanosleep kernel/time/hrtimer.c:1952 [inline] __x64_sys_nanosleep+0x1af/0x210 kernel/time/hrtimer.c:1952 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c381 Code: 75 14 b8 23 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 34 cf fb ff c3 48 83 ec 08 e8 0a 47 00 00 48 89 04 24 b8 23 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 47 00 00 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007fff8dcec9a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000023 RAX: ffffffffffffffda RBX: 000000000007e715 RCX: 000000000045c381 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007fff8dcec9b0 RBP: 0000000000000001 R08: 00000000fde30939 R09: 00000000fde3093d R10: 00007fff8dcecaa0 R11: 0000000000000293 R12: 000000000118bf20 R13: 000000000118c9a0 R14: 00000000000003e8 R15: 000000000118bfd4