================================ WARNING: inconsistent lock state 5.10.0-syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor.5/15027 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff888032fa4aa8 (&file_data->lock){+.?.}-{2:2}, at: spin_lock include/linux/spinlock.h:354 [inline] ffff888032fa4aa8 (&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+0x338f/0x4080 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: 1358 hardirqs last enabled at (1358): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (1358): [] _raw_spin_unlock_irqrestore+0x42/0x50 kernel/locking/spinlock.c:191 hardirqs last disabled at (1357): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (1357): [] _raw_spin_lock_irqsave+0x4e/0x50 kernel/locking/spinlock.c:159 softirqs last enabled at (0): [] copy_process+0x1bc4/0x6fc0 kernel/fork.c:2048 softirqs last disabled at (1271): [] 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 *** 3 locks held by syz-executor.5/15027: #0: ffff88801f0edc78 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:354 [inline] #0: ffff88801f0edc78 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: zap_pte_range mm/memory.c:1222 [inline] #0: ffff88801f0edc78 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: zap_pmd_range mm/memory.c:1368 [inline] #0: ffff88801f0edc78 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: zap_pud_range mm/memory.c:1397 [inline] #0: ffff88801f0edc78 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: zap_p4d_range mm/memory.c:1418 [inline] #0: ffff88801f0edc78 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: unmap_page_range+0x7fe/0x2640 mm/memory.c:1439 #1: ffffffff8b339e40 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2479 [inline] #1: ffffffff8b339e40 (rcu_callback){....}-{0:0}, at: rcu_core+0x582/0xf00 kernel/rcu/tree.c:2723 #2: ffffffff8b339f60 (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: 15027 Comm: syz-executor.5 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:get_current arch/x86/include/asm/current.h:15 [inline] RIP: 0010:write_comp_data+0xa/0x80 kernel/kcov.c:217 Code: 10 65 48 8b 04 25 00 f0 01 00 48 8b 80 c0 14 00 00 c3 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 49 89 f2 65 8b 05 66 6a 91 7e <65> 48 8b 34 25 00 f0 01 00 a9 00 01 ff 00 74 0f f6 c4 01 74 59 8b RSP: 0018:ffffc90016f8f790 EFLAGS: 00000246 RAX: 0000000080000001 RBX: 00fff00000000000 RCX: ffffffff81a2a39a RDX: 00fff00000000000 RSI: ffffffffffffffff RDI: 0000000000000007 RBP: ffffea0001d4e680 R08: 0000000000000000 R09: ffff888017166447 R10: ffffffffffffffff R11: 0000000000000000 R12: ffffea0001d4e680 R13: ffff8880322c4418 R14: dffffc0000000000 R15: 00007f993e684000 PageSwapBacked include/linux/page-flags.h:356 [inline] mm_counter_file include/linux/mm.h:1898 [inline] mm_counter include/linux/mm.h:1907 [inline] zap_pte_range mm/memory.c:1263 [inline] zap_pmd_range mm/memory.c:1368 [inline] zap_pud_range mm/memory.c:1397 [inline] zap_p4d_range mm/memory.c:1418 [inline] unmap_page_range+0xd6a/0x2640 mm/memory.c:1439 unmap_single_vma+0x198/0x300 mm/memory.c:1484 unmap_vmas+0x168/0x2e0 mm/memory.c:1516 exit_mmap+0x2b1/0x5a0 mm/mmap.c:3220 __mmput+0x122/0x470 kernel/fork.c:1083 mmput+0x53/0x60 kernel/fork.c:1104 exit_mm kernel/exit.c:500 [inline] do_exit+0xa97/0x29e0 kernel/exit.c:810 do_group_exit+0x125/0x310 kernel/exit.c:920 get_signal+0x42a/0x1fb0 kernel/signal.c:2792 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:811 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x124/0x200 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: 0033:0x45e159 Code: Unable to access opcode bytes at RIP 0x45e12f. RSP: 002b:00007f993d9aacf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 000000000119bf88 RCX: 000000000045e159 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 000000000119bf8c RBP: 000000000119bf80 R08: 0000000000000016 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffc55b1dfaf R14: 00007f993d9ab9c0 R15: 000000000119bf8c