================================ WARNING: inconsistent lock state 5.10.0-syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor.4/9988 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff888027eafca8 (&file_data->lock){+.?.}-{2:2}, at: spin_lock include/linux/spinlock.h:354 [inline] ffff888027eafca8 (&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+0x355e/0x41f0 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: 1238 hardirqs last enabled at (1238): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (1238): [] _raw_spin_unlock_irqrestore+0x42/0x50 kernel/locking/spinlock.c:191 hardirqs last disabled at (1237): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (1237): [] _raw_spin_lock_irqsave+0x4e/0x50 kernel/locking/spinlock.c:159 softirqs last enabled at (0): [] copy_process+0x1bc4/0x6fe0 kernel/fork.c:2048 softirqs last disabled at (1083): [] 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.4/9988: #0: ffffffff8b78df00 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2479 [inline] #0: ffffffff8b78df00 (rcu_callback){....}-{0:0}, at: rcu_core+0x6f4/0xf80 kernel/rcu/tree.c:2723 #1: ffffffff8b78e020 (rcu_read_lock){....}-{1:2}, at: percpu_ref_put_many.constprop.0+0x0/0x290 include/linux/cgroup.h:576 stack backtrace: CPU: 1 PID: 9988 Comm: syz-executor.4 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: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:kmem_cache_free+0x75/0x1c0 mm/slab.c:3700 Code: 00 00 4c 89 e6 48 89 ef e8 28 53 00 00 84 c0 75 0e 4c 89 f2 4c 89 e6 48 89 ef e8 e6 f8 ff ff 4d 85 ed 0f 85 ac 00 00 00 53 9d <48> 8b 74 24 28 0f 1f 44 00 00 65 8b 05 4a 04 4d 7e 83 f8 07 0f 87 RSP: 0018:ffffc9001698fe30 EFLAGS: 00000286 RAX: 0000000000000439 RBX: 0000000000000286 RCX: 1ffffffff1afa231 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff888140047a00 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff8177f098 R11: 0000000000000000 R12: ffff8880198acf20 R13: 0000000000000200 R14: ffffffff838361c4 R15: ffff8880381e5818 security_file_free+0xa4/0xd0 security/security.c:1476 file_free fs/file_table.c:55 [inline] __fput+0x3d5/0x920 fs/file_table.c:298 task_work_run+0xdd/0x190 kernel/task_work.c:168 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x1f0/0x200 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x417aa1 Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 a4 1a 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007ffe8f77ec40 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000417aa1 RDX: 0000000000000004 RSI: 00007ffe8f77ec70 RDI: 0000000000000003 RBP: 00007ffe8f77ec70 R08: 0000000000000000 R09: 0000000000000004 R10: 0000000000000075 R11: 0000000000000293 R12: 00000000004c3bc1 R13: 0000000000000003 R14: 0000000000000001 R15: 0000000000000001