================================ WARNING: inconsistent lock state 5.9.0-rc8-next-20201008-syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor.3/9828 [HC0[0]:SC1[1]:HE0:SE0] takes: ffff88802f1acc18 (&xa->xa_lock#8){+.?.}-{2:2}, at: xa_destroy+0xaa/0x350 lib/xarray.c:2205 {SOFTIRQ-ON-W} state was registered at: lock_acquire+0x1f2/0xaa0 kernel/locking/lockdep.c:5419 __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_uring_add_task_file fs/io_uring.c:8607 [inline] io_uring_add_task_file+0x207/0x430 fs/io_uring.c:8590 io_uring_get_fd fs/io_uring.c:9116 [inline] io_uring_create fs/io_uring.c:9280 [inline] io_uring_setup+0x2727/0x3660 fs/io_uring.c:9314 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 irq event stamp: 3967 hardirqs last enabled at (3966): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (3966): [] _raw_spin_unlock_irqrestore+0x6f/0x90 kernel/locking/spinlock.c:191 hardirqs last disabled at (3967): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (3967): [] _raw_spin_lock_irqsave+0xa9/0xd0 kernel/locking/spinlock.c:159 softirqs last enabled at (3418): [] asm_call_irq_on_stack+0xf/0x20 softirqs last disabled at (3895): [] asm_call_irq_on_stack+0xf/0x20 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&xa->xa_lock#8); lock(&xa->xa_lock#8); *** DEADLOCK *** 3 locks held by syz-executor.3/9828: #0: ffff888077350108 (&vcpu->mutex){+.+.}-{3:3}, at: kvm_vcpu_ioctl+0x175/0xd90 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3207 #1: ffffc900016e4ff8 (&kvm->srcu){....}-{0:0}, at: vcpu_enter_guest+0x178f/0x3b20 arch/x86/kvm/x86.c:8639 #2: ffffffff8a554c80 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2474 [inline] #2: ffffffff8a554c80 (rcu_callback){....}-{0:0}, at: rcu_core+0x5d8/0x1240 kernel/rcu/tree.c:2718 stack backtrace: CPU: 1 PID: 9828 Comm: syz-executor.3 Not tainted 5.9.0-rc8-next-20201008-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x198/0x1fb lib/dump_stack.c:118 print_usage_bug kernel/locking/lockdep.c:3715 [inline] valid_state kernel/locking/lockdep.c:3726 [inline] mark_lock_irq kernel/locking/lockdep.c:3929 [inline] mark_lock.cold+0x32/0x74 kernel/locking/lockdep.c:4396 mark_usage kernel/locking/lockdep.c:4281 [inline] __lock_acquire+0x118a/0x56d0 kernel/locking/lockdep.c:4771 lock_acquire+0x1f2/0xaa0 kernel/locking/lockdep.c:5419 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x94/0xd0 kernel/locking/spinlock.c:159 xa_destroy+0xaa/0x350 lib/xarray.c:2205 __io_uring_free+0x60/0xc0 fs/io_uring.c:7693 io_uring_free include/linux/io_uring.h:40 [inline] __put_task_struct+0xff/0x3f0 kernel/fork.c:732 put_task_struct include/linux/sched/task.h:111 [inline] delayed_put_task_struct+0x1f6/0x340 kernel/exit.c:172 rcu_do_batch kernel/rcu/tree.c:2484 [inline] rcu_core+0x645/0x1240 kernel/rcu/tree.c:2718 __do_softirq+0x203/0xab6 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+0x9b/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+0x235/0x280 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x51/0xf0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 RIP: 0010:__vmcs_readl arch/x86/kvm/vmx/ops.h:72 [inline] RIP: 0010:vmcs_read16 arch/x86/kvm/vmx/ops.h:109 [inline] RIP: 0010:vmx_read_guest_seg_selector+0xde/0x180 arch/x86/kvm/vmx/vmx.c:736 Code: 04 02 84 c0 74 08 3c 03 0f 8e 97 00 00 00 48 89 d8 48 c1 e0 04 44 8b a0 20 62 a4 88 0f 1f 44 00 00 e8 46 25 5a 00 45 0f 78 e4 <3e> 77 0d 6a 00 41 54 e8 46 e3 02 00 41 5c 41 5c e8 2d 25 5a 00 48 RSP: 0018:ffffc90005eff688 EFLAGS: 00000202 RAX: 000000000002ae2f RBX: 0000000000000003 RCX: ffffc9000f4f4000 RDX: 0000000000040000 RSI: ffffffff811b359a RDI: ffffffff88a46250 RBP: ffff888077350040 R08: 0000000000000000 R09: ffff888077350387 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000003 R14: 000000000000ffff R15: 0000000000000003 vmx_get_segment+0x310/0x770 arch/x86/kvm/vmx/vmx.c:3233 kvm_get_segment arch/x86/kvm/x86.c:5516 [inline] emulator_get_segment+0xaa/0x440 arch/x86/kvm/x86.c:6316 __linearize arch/x86/kvm/emulate.c:735 [inline] linearize.isra.0+0x1a4/0x8f0 arch/x86/kvm/emulate.c:780 segmented_read arch/x86/kvm/emulate.c:1478 [inline] x86_emulate_insn+0x1813/0x3d20 arch/x86/kvm/emulate.c:5657 x86_emulate_instruction+0x752/0x1d90 arch/x86/kvm/x86.c:7031 kvm_mmu_page_fault+0x305/0x14d0 arch/x86/kvm/mmu/mmu.c:5500 handle_ept_violation+0x29c/0x700 arch/x86/kvm/vmx/vmx.c:5343 vmx_handle_exit+0x2a6/0x1510 arch/x86/kvm/vmx/vmx.c:6125 vcpu_enter_guest+0x18f4/0x3b20 arch/x86/kvm/x86.c:8655 vcpu_run arch/x86/kvm/x86.c:8720 [inline] kvm_arch_vcpu_ioctl_run+0x440/0x1780 arch/x86/kvm/x86.c:8937 kvm_vcpu_ioctl+0x467/0xd90 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3230 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45de29 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f5399405c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000011d40 RCX: 000000000045de29 RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000007 RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007ffc68db4eff R14: 00007f53994069c0 R15: 000000000118bf2c