================================ WARNING: inconsistent lock state 5.9.0-rc8-next-20201008-syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor.2/8755 [HC0[0]:SC1[1]:HE0:SE0] takes: ffff888013312618 (&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: 1957 hardirqs last enabled at (1956): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (1956): [] _raw_spin_unlock_irqrestore+0x6f/0x90 kernel/locking/spinlock.c:191 hardirqs last disabled at (1957): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (1957): [] _raw_spin_lock_irqsave+0xa9/0xd0 kernel/locking/spinlock.c:159 softirqs last enabled at (1768): [] memcpy include/linux/string.h:399 [inline] softirqs last enabled at (1768): [] fpu__copy+0x176/0x6a0 arch/x86/kernel/fpu/core.c:240 softirqs last disabled at (1785): [] 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 *** 1 lock held by syz-executor.2/8755: #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: 8755 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:unwind_next_frame+0xd1a/0x1f90 arch/x86/kernel/unwind_orc.c:584 Code: 48 89 ce 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 48 c1 ee 03 0f b6 14 02 0f b6 04 06 4c 89 ce 83 e6 07 40 38 f2 40 0f 9e c6 <84> d2 0f 95 c2 40 84 d6 0f 85 bd 0b 00 00 83 e1 07 38 c8 0f 9e c2 RSP: 0018:ffffc90016997638 EFLAGS: 00000297 RAX: 0000000000000000 RBX: 1ffff92002d32ecf RCX: ffffffff8c25404f RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffc900169977b8 RBP: 0000000000000001 R08: ffffffff8c25404a R09: ffffffff8c25404e R10: 0000000000078084 R11: 0000000000000001 R12: ffffc90016997760 R13: ffffc90016997795 R14: ffffc900169977b0 R15: ffffc90016997760 __unwind_start+0x517/0x800 arch/x86/kernel/unwind_orc.c:703 unwind_start arch/x86/include/asm/unwind.h:60 [inline] arch_stack_walk+0x5c/0xe0 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461 __do_kmalloc mm/slab.c:3657 [inline] __kmalloc+0x27b/0x4d0 mm/slab.c:3666 kmalloc include/linux/slab.h:559 [inline] kzalloc include/linux/slab.h:666 [inline] lsm_task_alloc security/security.c:610 [inline] security_task_alloc+0x10b/0x250 security/security.c:1584 copy_process+0x1ec1/0x6e90 kernel/fork.c:2077 kernel_clone+0xe5/0xae0 kernel/fork.c:2456 __do_sys_clone+0xc8/0x110 kernel/fork.c:2573 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4607f9 Code: ff 48 85 f6 0f 84 37 8a fb ff 48 83 ee 10 48 89 4e 08 48 89 3e 48 89 d7 4c 89 c2 4d 89 c8 4c 8b 54 24 08 b8 38 00 00 00 0f 05 <48> 85 c0 0f 8c 0e 8a fb ff 74 01 c3 31 ed 48 f7 c7 00 00 01 00 75 RSP: 002b:00007ffd35c75188 EFLAGS: 00000202 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007f3e4066a700 RCX: 00000000004607f9 RDX: 00007f3e4066a9d0 RSI: 00007f3e40669db0 RDI: 00000000003d0f00 RBP: 00007ffd35c753a0 R08: 00007f3e4066a700 R09: 00007f3e4066a700 R10: 00007f3e4066a9d0 R11: 0000000000000202 R12: 0000000000000000 R13: 00007ffd35c7523f R14: 00007f3e4066a9c0 R15: 000000000118bfd4