================================ WARNING: inconsistent lock state 5.9.0-rc8-next-20201008-syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor.1/6896 [HC0[0]:SC1[1]:HE0:SE0] takes: ffff888025d83a18 (&xa->xa_lock#10){+.?.}-{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: 377549 hardirqs last enabled at (377548): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (377548): [] _raw_spin_unlock_irqrestore+0x6f/0x90 kernel/locking/spinlock.c:191 hardirqs last disabled at (377549): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (377549): [] _raw_spin_lock_irqsave+0xa9/0xd0 kernel/locking/spinlock.c:159 softirqs last enabled at (376438): [] asm_call_irq_on_stack+0xf/0x20 softirqs last disabled at (377515): [] asm_call_irq_on_stack+0xf/0x20 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&xa->xa_lock#10); lock(&xa->xa_lock#10); *** DEADLOCK *** 3 locks held by syz-executor.1/6896: #0: ffff888137770460 (sb_writers#4){.+.+}-{0:0}, at: sb_start_write include/linux/fs.h:1648 [inline] #0: ffff888137770460 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3a/0xb0 fs/namespace.c:354 #1: ffff88805e9b8a08 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:809 [inline] #1: ffff88805e9b8a08 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: do_unlinkat+0x27d/0x660 fs/namei.c:3883 #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: 6896 Comm: syz-executor.1 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:arch_local_irq_restore arch/x86/include/asm/paravirt.h:653 [inline] RIP: 0010:seqcount_lockdep_reader_access include/linux/seqlock.h:105 [inline] RIP: 0010:read_seqbegin.constprop.0+0x10f/0x1e0 include/linux/seqlock.h:838 Code: 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 ba 00 00 00 48 83 3d 99 cc 74 08 00 0f 84 94 00 00 00 e8 86 25 ad ff 48 89 df 57 9d <0f> 1f 44 00 00 eb 07 e8 75 25 ad ff f3 90 44 8b 25 cc 10 59 08 31 RSP: 0018:ffffc90005497d98 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000293 RCX: ffffffff815aa1a7 RDX: ffff88800fe5a380 RSI: ffffffff81c8355a RDI: 0000000000000293 RBP: ffffc90005497ed0 R08: 0000000000000001 R09: ffffffff8d732a2f R10: fffffbfff1ae6545 R11: 0000000000000000 R12: 0000000000000200 R13: ffff88802f27cc00 R14: 0000000000000000 R15: 0000000000000000 d_lookup+0x18/0x60 fs/dcache.c:2334 lookup_dcache+0x1e/0x130 fs/namei.c:1407 __lookup_hash+0x29/0x180 fs/namei.c:1430 do_unlinkat+0x295/0x660 fs/namei.c:3884 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45db77 Code: 00 66 90 b8 58 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 8d b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fff9ceb36b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045db77 RDX: 00007fff9ceb36d0 RSI: 00007fff9ceb36d0 RDI: 00007fff9ceb3760 RBP: 0000000000000035 R08: 0000000000000000 R09: 000000000000000f R10: 000000000000000a R11: 0000000000000246 R12: 00007fff9ceb47f0 R13: 00000000021dda60 R14: 0000000000000000 R15: 00007fff9ceb47f0