================================ WARNING: inconsistent lock state 5.9.0-rc8-next-20201008-syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor.2/10853 [HC0[0]:SC1[1]:HE0:SE0] takes: ffff888017bc2c18 (&xa->xa_lock#9){+.?.}-{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: 3667 hardirqs last enabled at (3666): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (3666): [] _raw_spin_unlock_irqrestore+0x6f/0x90 kernel/locking/spinlock.c:191 hardirqs last disabled at (3667): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (3667): [] _raw_spin_lock_irqsave+0xa9/0xd0 kernel/locking/spinlock.c:159 softirqs last enabled at (2774): [] asm_call_irq_on_stack+0xf/0x20 softirqs last disabled at (3629): [] asm_call_irq_on_stack+0xf/0x20 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&xa->xa_lock#9); lock(&xa->xa_lock#9); *** DEADLOCK *** 1 lock held by syz-executor.2/10853: #0: ffffffff8a554c80 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2474 [inline] #0: ffffffff8a554c80 (rcu_callback){....}-{0:0}, at: rcu_core+0x5d8/0x1240 kernel/rcu/tree.c:2718 stack backtrace: CPU: 1 PID: 10853 Comm: syz-executor.2 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:compound_head include/linux/page-flags.h:185 [inline] RIP: 0010:PageSwapCache include/linux/page-flags.h:400 [inline] RIP: 0010:free_swap_cache+0xc/0x300 mm/swap_state.c:326 Code: e8 99 3e c5 ff 48 89 ef 48 c7 c6 60 58 b6 88 4c 89 e2 e8 f7 a6 28 02 5d 48 98 41 5c c3 90 41 57 41 56 41 55 41 54 49 89 fc 55 <4d> 8d 6c 24 08 53 e8 69 3e c5 ff 4c 89 ea 48 b8 00 00 00 00 00 fc RSP: 0018:ffffc90007d576e0 EFLAGS: 00000296 RAX: 1ffff11002ea6417 RBX: ffff8880175320c0 RCX: ffffffff81b056b2 RDX: ffff88802a980580 RSI: ffffffff81b0568b RDI: ffffea0000b09a80 RBP: 0000000000000016 R08: 0000000000000000 R09: ffffea0000b09a47 R10: 00000000000001fe R11: 0000000000000000 R12: ffffea0000b09a80 R13: ffff888017532010 R14: dffffc0000000000 R15: ffffc90007d57a90 free_pages_and_swap_cache+0x58/0x90 mm/swap_state.c:354 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline] tlb_flush_mmu_free mm/mmu_gather.c:242 [inline] tlb_flush_mmu+0xe9/0x6b0 mm/mmu_gather.c:249 zap_pte_range mm/memory.c:1352 [inline] zap_pmd_range mm/memory.c:1390 [inline] zap_pud_range mm/memory.c:1419 [inline] zap_p4d_range mm/memory.c:1440 [inline] unmap_page_range+0x1e01/0x2b50 mm/memory.c:1461 unmap_single_vma+0x198/0x300 mm/memory.c:1506 unmap_vmas+0x168/0x2e0 mm/memory.c:1538 exit_mmap+0x2b1/0x530 mm/mmap.c:3237 __mmput+0x122/0x470 kernel/fork.c:1079 mmput+0x53/0x60 kernel/fork.c:1100 exit_mm kernel/exit.c:483 [inline] do_exit+0xa31/0x2930 kernel/exit.c:793 do_group_exit+0x125/0x310 kernel/exit.c:903 get_signal+0x428/0x1f00 kernel/signal.c:2757 arch_do_signal+0x82/0x2470 arch/x86/kernel/signal.c:811 exit_to_user_mode_loop kernel/entry/common.c:161 [inline] exit_to_user_mode_prepare+0x194/0x1f0 kernel/entry/common.c:192 syscall_exit_to_user_mode+0x7a/0x2c0 kernel/entry/common.c:267 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45de29 Code: Unable to access opcode bytes at RIP 0x45ddff. RSP: 002b:00007f9f4e0cecf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000118bf28 RCX: 000000000045de29 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000118bf28 RBP: 000000000118bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007ffd851796ff R14: 00007f9f4e0cf9c0 R15: 000000000118bf2c