================================ WARNING: inconsistent lock state 5.10.0-syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. systemd-udevd/4893 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff888147cc62a8 (&file_data->lock){+.?.}-{2:2}, at: spin_lock include/linux/spinlock.h:354 [inline] ffff888147cc62a8 (&file_data->lock){+.?.}-{2:2}, at: io_file_data_ref_zero+0x75/0x480 fs/io_uring.c:7361 {SOFTIRQ-ON-W} state was registered at: lock_acquire kernel/locking/lockdep.c:5437 [inline] lock_acquire+0x29d/0x740 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+0x343a/0x40d0 fs/io_uring.c:9755 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 irq event stamp: 6670922 hardirqs last enabled at (6670922): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (6670922): [] _raw_spin_unlock_irqrestore+0x42/0x50 kernel/locking/spinlock.c:191 hardirqs last disabled at (6670921): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (6670921): [] _raw_spin_lock_irqsave+0x4e/0x50 kernel/locking/spinlock.c:159 softirqs last enabled at (6668204): [] asm_call_irq_on_stack+0xf/0x20 softirqs last disabled at (6670907): [] 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 systemd-udevd/4893: #0: ffffffff8b339140 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2479 [inline] #0: ffffffff8b339140 (rcu_callback){....}-{0:0}, at: rcu_core+0x582/0xf00 kernel/rcu/tree.c:2723 #1: ffffffff8b339260 (rcu_read_lock){....}-{1:2}, at: percpu_ref_put_many.constprop.0+0x0/0x250 net/netfilter/xt_cgroup.c:62 stack backtrace: CPU: 1 PID: 4893 Comm: systemd-udevd Not tainted 5.10.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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:3740 [inline] valid_state kernel/locking/lockdep.c:3751 [inline] mark_lock_irq kernel/locking/lockdep.c:3954 [inline] mark_lock.cold+0x31/0x73 kernel/locking/lockdep.c:4411 mark_usage kernel/locking/lockdep.c:4306 [inline] __lock_acquire+0x11a5/0x5500 kernel/locking/lockdep.c:4786 lock_acquire kernel/locking/lockdep.c:5437 [inline] lock_acquire+0x29d/0x740 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+0x75/0x480 fs/io_uring.c:7361 percpu_ref_put_many.constprop.0+0x217/0x250 include/linux/percpu-refcount.h:322 rcu_do_batch kernel/rcu/tree.c:2489 [inline] rcu_core+0x5eb/0xf00 kernel/rcu/tree.c:2723 __do_softirq+0x2a0/0x9f6 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+0xaa/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0x132/0x200 kernel/softirq.c:435 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:__slab_alloc.constprop.0+0x55/0xe0 mm/slub.c:2784 Code: 81 fc 34 07 83 f8 07 89 c2 77 6e 48 03 1c d5 c0 e6 e3 8a 4c 89 f9 44 89 f2 44 89 ee 48 89 ef 49 89 d8 e8 ce f3 ff ff 41 54 9d <48> 83 c4 08 5b 5d 41 5c 41 5d 41 5e 41 5f c3 e8 87 a5 c4 ff 48 8b RSP: 0018:ffffc900015ffc28 EFLAGS: 00000296 RAX: ffff88802f1f2200 RBX: ffff8880b9f3a4c0 RCX: 1ffffffff19d8d19 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff8880101c0280 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000296 R13: 0000000000000cc0 R14: 00000000ffffffff R15: ffffffff81c0bff0 slab_alloc_node mm/slub.c:2856 [inline] slab_alloc mm/slub.c:2899 [inline] kmem_cache_alloc+0x36e/0x440 mm/slub.c:2904 getname_flags.part.0+0x50/0x4f0 fs/namei.c:138 getname_flags fs/namei.c:2647 [inline] user_path_at_empty+0xa1/0x100 fs/namei.c:2647 user_path_at include/linux/namei.h:59 [inline] vfs_statx+0x142/0x390 fs/stat.c:185 vfs_fstatat fs/stat.c:207 [inline] vfs_lstat include/linux/fs.h:3125 [inline] __do_sys_newlstat+0x91/0x110 fs/stat.c:362 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f644ddab335 Code: 69 db 2b 00 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 83 ff 01 48 89 f0 77 30 48 89 c7 48 89 d6 b8 06 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 03 f3 c3 90 48 8b 15 31 db 2b 00 f7 d8 64 89 RSP: 002b:00007ffd6aa1de28 EFLAGS: 00000246 ORIG_RAX: 0000000000000006 RAX: ffffffffffffffda RBX: 0000559f5d684cb0 RCX: 00007f644ddab335 RDX: 00007ffd6aa1de60 RSI: 00007ffd6aa1de60 RDI: 0000559f5d683cb0 RBP: 00007ffd6aa1df20 R08: 00007f644e06a188 R09: 0000000000001010 R10: 0000000000000020 R11: 0000000000000246 R12: 0000559f5d683cb0 R13: 0000559f5d683cd6 R14: 0000559f5d66dca1 R15: 0000559f5d66dca6