================================ WARNING: inconsistent lock state 5.10.0-syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. kworker/u4:0/8 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff888147a134a8 (&file_data->lock){+.?.}-{2:2}, at: spin_lock include/linux/spinlock.h:354 [inline] ffff888147a134a8 (&file_data->lock){+.?.}-{2:2}, at: io_file_data_ref_zero+0x78/0x4d0 fs/io_uring.c:7361 {SOFTIRQ-ON-W} state was registered at: lock_acquire kernel/locking/lockdep.c:5437 [inline] lock_acquire+0x29d/0x750 kernel/locking/lockdep.c:5402 __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+0x3552/0x41f0 fs/io_uring.c:9755 do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline] __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:137 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c irq event stamp: 4703914 hardirqs last enabled at (4703914): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (4703914): [] _raw_spin_unlock_irqrestore+0x42/0x50 kernel/locking/spinlock.c:191 hardirqs last disabled at (4703913): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (4703913): [] _raw_spin_lock_irqsave+0x4e/0x50 kernel/locking/spinlock.c:159 softirqs last enabled at (4703650): [] spin_unlock_bh include/linux/spinlock.h:399 [inline] softirqs last enabled at (4703650): [] batadv_nc_purge_paths+0x2a5/0x3a0 net/batman-adv/network-coding.c:467 softirqs last disabled at (4703657): [] 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/u4:0/8: #0: ffff888021d2c938 ((wq_completion)bat_events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888021d2c938 ((wq_completion)bat_events){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff888021d2c938 ((wq_completion)bat_events){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff888021d2c938 ((wq_completion)bat_events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff888021d2c938 ((wq_completion)bat_events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff888021d2c938 ((wq_completion)bat_events){+.+.}-{0:0}, at: process_one_work+0x871/0x1630 kernel/workqueue.c:2246 #1: ffffc90000cd7da8 ((work_completion)(&(&bat_priv->nc.work)->work)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x1630 kernel/workqueue.c:2250 #2: ffffffff8b78e120 (rcu_read_lock){....}-{1:2}, at: batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:402 [inline] #2: ffffffff8b78e120 (rcu_read_lock){....}-{1:2}, at: batadv_nc_worker+0xf3/0xe80 net/batman-adv/network-coding.c:715 #3: ffffffff8b78e000 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2479 [inline] #3: ffffffff8b78e000 (rcu_callback){....}-{0:0}, at: rcu_core+0x6f4/0xf80 kernel/rcu/tree.c:2723 #4: ffffffff8b78e120 (rcu_read_lock){....}-{1:2}, at: percpu_ref_put_many.constprop.0+0x0/0x290 include/linux/cgroup.h:576 stack backtrace: CPU: 1 PID: 8 Comm: kworker/u4:0 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+0x107/0x163 lib/dump_stack.c:120 print_usage_bug kernel/locking/lockdep.c:4413 [inline] valid_state kernel/locking/lockdep.c:3751 [inline] mark_lock_irq kernel/locking/lockdep.c:3954 [inline] mark_lock.cold+0x56/0x73 kernel/locking/lockdep.c:4411 mark_usage kernel/locking/lockdep.c:4306 [inline] __lock_acquire+0x11b4/0x54b0 kernel/locking/lockdep.c:4786 lock_acquire kernel/locking/lockdep.c:5437 [inline] lock_acquire+0x29d/0x750 kernel/locking/lockdep.c:5402 __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+0x78/0x4d0 fs/io_uring.c:7361 percpu_ref_put_many.constprop.0+0x258/0x290 include/linux/percpu-refcount.h:322 rcu_do_batch kernel/rcu/tree.c:2489 [inline] rcu_core+0x75d/0xf80 kernel/rcu/tree.c:2723 __do_softirq+0x2bc/0xa77 kernel/softirq.c:343 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+0xaa/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:226 [inline] __irq_exit_rcu+0x17f/0x200 kernel/softirq.c:420 irq_exit_rcu+0x5/0x20 kernel/softirq.c:432 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/irqflags.h:85 [inline] RIP: 0010:lock_acquire kernel/locking/lockdep.c:5440 [inline] RIP: 0010:lock_acquire+0x2c7/0x750 kernel/locking/lockdep.c:5402 Code: 48 c7 c7 40 99 6b 89 48 83 c4 20 e8 63 fe bc 07 b8 ff ff ff ff 65 0f c1 05 16 3b aa 7e 83 f8 01 0f 85 40 03 00 00 ff 34 24 9d 3a fe ff ff 65 ff 05 7d 29 aa 7e 48 8b 05 d6 9b 11 0c e8 81 f3 RSP: 0018:ffffc90000cd7ba0 EFLAGS: 00000246 RAX: 0000000000000001 RBX: 1ffff9200019af76 RCX: 0000000000000001 RDX: 1ffff110022a5b38 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8f4f97a7 R10: fffffbfff1e9f2f4 R11: 0000000000000000 R12: 0000000000000002 R13: ffffffff8b78e120 R14: 0000000000000000 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:253 [inline] rcu_read_lock include/linux/rcupdate.h:642 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:404 [inline] batadv_nc_worker+0x12d/0xe80 net/batman-adv/network-coding.c:715 process_one_work+0x98d/0x1630 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296