================================ WARNING: inconsistent lock state 5.10.0-syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. kworker/u4:3/64 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff8880184f00a8 (&file_data->lock){+.?.}-{2:2}, at: spin_lock include/linux/spinlock.h:354 [inline] ffff8880184f00a8 (&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+0x2416/0x2850 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: 9183338 hardirqs last enabled at (9183338): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (9183338): [] _raw_spin_unlock_irqrestore+0x2e/0x60 kernel/locking/spinlock.c:191 hardirqs last disabled at (9183337): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (9183337): [] _raw_spin_lock_irqsave+0x4d/0xa0 kernel/locking/spinlock.c:159 softirqs last enabled at (9183238): [] spin_unlock_bh include/linux/spinlock.h:399 [inline] softirqs last enabled at (9183238): [] ieee80211_ibss_work+0x2e3/0x1450 net/mac80211/ibss.c:1704 softirqs last disabled at (9183273): [] 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/u4:3/64: #0: ffff888010469138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x6f4/0xfc0 kernel/workqueue.c:2248 #1: ffffc90000e2fd78 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x733/0xfc0 kernel/workqueue.c:2250 #2: ffffffff8bd9f9e0 (fs_reclaim){+.+.}-{0:0}, at: __fs_reclaim_acquire+0x0/0x30 mm/page_alloc.c:3982 #3: ffffffff8bce8680 (rcu_callback){....}-{0:0}, at: rcu_lock_acquire+0x0/0x20 kernel/rcu/tree.c:1374 #4: ffffffff8bce85c0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:252 stack backtrace: CPU: 1 PID: 64 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: events_unbound call_usermodehelper_exec_work 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:lock_acquire+0x144/0x5e0 arch/x86/include/asm/irqflags.h:41 Code: c7 80 43 ae 89 e8 0c 82 ea 07 b8 ff ff ff ff 65 0f c1 05 df b7 a8 7e 83 f8 01 0f 85 09 02 00 00 48 89 5c 24 18 ff 74 24 18 9d <65> 48 8b 04 25 28 00 00 00 48 3b 44 24 50 0f 85 32 04 00 00 48 83 RSP: 0018:ffffc90000e2f708 EFLAGS: 00000246 RAX: 0000000000000001 RBX: 0000000000000246 RCX: ffff888011542440 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: dffffc0000000000 R09: fffffbfff1dd7293 R10: fffffbfff1dd7293 R11: 0000000000000000 R12: 0000000000000001 R13: 0000000000000000 R14: ffff888011542444 R15: 0000000000000000 __fs_reclaim_acquire+0x20/0x30 mm/page_alloc.c:4319 fs_reclaim_acquire+0x55/0xd0 mm/page_alloc.c:4333 prepare_alloc_pages+0x149/0x5a0 mm/page_alloc.c:4931 __alloc_pages_nodemask+0xb6/0x4f0 mm/page_alloc.c:4978 alloc_pages include/linux/gfp.h:547 [inline] __vmalloc_area_node mm/vmalloc.c:2508 [inline] __vmalloc_node_range+0x3af/0x890 mm/vmalloc.c:2574 alloc_thread_stack_node kernel/fork.c:244 [inline] dup_task_struct+0x65d/0x960 kernel/fork.c:865 copy_process+0x55c/0x53c0 kernel/fork.c:1942 kernel_clone+0x1a6/0x6c0 kernel/fork.c:2464 kernel_thread+0xf5/0x140 kernel/fork.c:2516 call_usermodehelper_exec_work+0x57/0x220 kernel/umh.c:172 process_one_work+0x789/0xfc0 kernel/workqueue.c:2275 worker_thread+0xaa4/0x1460 kernel/workqueue.c:2421 kthread+0x39a/0x3c0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296