Warning: Permanently added '10.128.0.155' (ECDSA) to the list of known hosts. syzkaller login: [ 525.545096][ C0] hrtimer: interrupt took 34240 ns [ 631.613859][ C0] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: [ 631.620903][ C0] rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6937/1:b..l [ 631.629017][ C0] (detected by 0, t=10503 jiffies, g=8537, q=88) [ 631.635425][ C0] task:syz-executor693 state:R running task stack:28448 pid: 6937 ppid: 6547 flags:0x00000000 [ 631.646616][ C0] Call Trace: [ 631.649895][ C0] __schedule+0xb44/0x5960 [ 631.654350][ C0] ? io_schedule_timeout+0x140/0x140 [ 631.659660][ C0] ? trace_hardirqs_on+0x38/0x1c0 [ 631.664737][ C0] preempt_schedule_irq+0x4e/0x90 [ 631.669759][ C0] irqentry_exit+0x31/0x80 [ 631.674168][ C0] asm_sysvec_reschedule_ipi+0x12/0x20 [ 631.679802][ C0] RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 [ 631.685870][ C0] Code: 01 f0 4d 89 03 e9 63 fd ff ff b9 ff ff ff ff ba 08 00 00 00 4d 8b 03 48 0f bd ca 49 8b 45 00 48 63 c9 e9 64 ff ff ff 0f 1f 00 <65> 8b 05 d9 17 8b 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b [ 631.705472][ C0] RSP: 0018:ffffc9000341f580 EFLAGS: 00000202 [ 631.711532][ C0] RAX: 0000000000000055 RBX: ffffffff899d0040 RCX: 0000000000000005 [ 631.719494][ C0] RDX: 0000000000000000 RSI: ffff888071345580 RDI: 0000000000000003 [ 631.727455][ C0] RBP: ffffc9000341f6a0 R08: ffffffff89e79640 R09: ffffffff83f6c0fa [ 631.735420][ C0] R10: 0000000000000005 R11: 0000000000000075 R12: ffffffff899d0041 [ 631.743382][ C0] R13: ffffffff899d0040 R14: 1ffff92000683eb4 R15: 0000000000000075 [ 631.751352][ C0] ? format_decode+0x20a/0xad0 [ 631.756126][ C0] format_decode+0x637/0xad0 [ 631.760718][ C0] ? enable_ptr_key_workfn+0x30/0x30 [ 631.766003][ C0] ? kasan_save_stack+0x1b/0x40 [ 631.770848][ C0] ? proc_self_get_link+0x187/0x1f0 [ 631.776040][ C0] ? step_into+0x14e1/0x1c80 [ 631.780628][ C0] ? walk_component+0x171/0x6a0 [ 631.785475][ C0] ? link_path_walk.part.0+0x757/0xd00 [ 631.790931][ C0] ? path_openat+0x265/0x2740 [ 631.795604][ C0] ? do_filp_open+0x1aa/0x400 [ 631.800286][ C0] vsnprintf+0x157/0x14f0 [ 631.804617][ C0] ? pointer+0xa00/0xa00 [ 631.808853][ C0] ? find_held_lock+0x2d/0x110 [ 631.813618][ C0] sprintf+0xc0/0x100 [ 631.817595][ C0] ? snprintf+0xf0/0xf0 [ 631.821754][ C0] ? rcu_read_lock_sched_held+0x3a/0x70 [ 631.827294][ C0] ? trace_kmalloc+0x32/0xf0 [ 631.831881][ C0] ? kmem_cache_alloc_trace+0x1da/0x3c0 [ 631.837428][ C0] proc_self_get_link+0x120/0x1f0 [ 631.842448][ C0] ? proc_ns_dir_lookup+0x2b0/0x2b0 [ 631.847642][ C0] step_into+0x14e1/0x1c80 [ 631.852064][ C0] ? lookup_open.isra.0+0x13d0/0x13d0 [ 631.857435][ C0] ? try_to_unlazy_next+0x490/0x490 [ 631.862720][ C0] ? projid_m_show+0x220/0x220 [ 631.867481][ C0] ? walk_component+0x112/0x6a0 [ 631.872331][ C0] walk_component+0x171/0x6a0 [ 631.877010][ C0] ? handle_dots.part.0+0x15e0/0x15e0 [ 631.882377][ C0] ? make_kuid+0x1e/0x30 [ 631.886615][ C0] ? generic_permission+0x121/0x5b0 [ 631.891811][ C0] ? security_inode_permission+0xc5/0xf0 [ 631.897619][ C0] link_path_walk.part.0+0x757/0xd00 [ 631.902908][ C0] ? walk_component+0x6a0/0x6a0 [ 631.907754][ C0] ? percpu_counter_add_batch+0xbd/0x180 [ 631.913512][ C0] path_openat+0x265/0x2740 [ 631.918047][ C0] ? path_lookupat+0x860/0x860 [ 631.922811][ C0] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 631.928796][ C0] do_filp_open+0x1aa/0x400 [ 631.933297][ C0] ? may_open_dev+0xf0/0xf0 [ 631.937803][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 631.942735][ C0] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 631.948974][ C0] ? _find_next_bit+0x1e3/0x260 [ 631.953829][ C0] ? _raw_spin_unlock+0x24/0x40 [ 631.958676][ C0] ? alloc_fd+0x2f0/0x670 [ 631.963009][ C0] do_sys_openat2+0x16d/0x4d0 [ 631.967681][ C0] ? build_open_flags+0x6f0/0x6f0 [ 631.972703][ C0] ? __context_tracking_exit+0xb8/0xe0 [ 631.978164][ C0] ? lock_downgrade+0x6e0/0x6e0 [ 631.983007][ C0] ? lock_downgrade+0x6e0/0x6e0 [ 631.987856][ C0] __x64_sys_openat+0x13f/0x1f0 [ 631.993405][ C0] ? __ia32_sys_open+0x1c0/0x1c0 [ 631.998358][ C0] ? syscall_enter_from_user_mode+0x21/0x70 [ 632.004258][ C0] do_syscall_64+0x35/0xb0 [ 632.008667][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 632.014558][ C0] RIP: 0033:0x7f4a6ad2e9e7 [ 632.018973][ C0] RSP: 002b:00007ffced9fc510 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 [ 632.027379][ C0] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f4a6ad2e9e7 [ 632.035346][ C0] RDX: 0000000000080001 RSI: 00007f4a6adc3022 RDI: 00000000ffffff9c [ 632.043309][ C0] RBP: 00007f4a6adc3022 R08: 0000000000000000 R09: 00007ffced9fc500 [ 632.051358][ C0] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000080001 [ 632.059323][ C0] R13: 0000000000000000 R14: 00007ffced9fcaf0 R15: 00007ffced9fcab4 [ 632.067391][ C0] rcu: rcu_preempt kthread starved for 10547 jiffies! g8537 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 [ 632.078493][ C0] rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. [ 632.088455][ C0] rcu: RCU grace-period kthread stack dump: [ 632.094329][ C0] task:rcu_preempt state:R running task stack:28696 pid: 14 ppid: 2 flags:0x00004000 [ 632.105101][ C0] Call Trace: [ 632.108378][ C0] __schedule+0xb44/0x5960 [ 632.112792][ C0] ? _raw_spin_unlock_irqrestore+0x50/0x70 [ 632.118604][ C0] ? __mod_timer+0x83c/0xe30 [ 632.123202][ C0] ? run_timer_softirq+0x140/0x1d0 [ 632.128305][ C0] ? io_schedule_timeout+0x140/0x140 [ 632.133591][ C0] ? debug_object_destroy+0x210/0x210 [ 632.138971][ C0] schedule+0xd3/0x270 [ 632.143040][ C0] schedule_timeout+0x14a/0x2a0 [ 632.147889][ C0] ? usleep_range+0x170/0x170 [ 632.152566][ C0] ? destroy_timer_on_stack+0x20/0x20 [ 632.157945][ C0] ? check_leaf.cold+0x60f/0x7f4 [ 632.162883][ C0] ? _raw_spin_unlock_irqrestore+0x3d/0x70 [ 632.168690][ C0] ? prepare_to_swait_event+0xee/0x470 [ 632.174150][ C0] rcu_gp_fqs_loop+0x186/0x800 [ 632.178917][ C0] ? force_qs_rnp+0x760/0x760 [ 632.183594][ C0] ? rcu_gp_init+0x906/0x12a0 [ 632.188280][ C0] rcu_gp_kthread+0x1de/0x320 [ 632.192956][ C0] ? rcu_gp_init+0x12a0/0x12a0 [ 632.197740][ C0] ? __sanitizer_cov_trace_const_cmp1+0x22/0x80 [ 632.203982][ C0] ? __kthread_parkme+0x15f/0x220 [ 632.209012][ C0] ? rcu_gp_init+0x12a0/0x12a0 [ 632.213782][ C0] kthread+0x3e5/0x4d0 [ 632.217852][ C0] ? set_kthread_struct+0x130/0x130 [ 632.223050][ C0] ret_from_fork+0x1f/0x30 [ 632.227476][ C0] rcu: Stack dump where RCU GP kthread last ran: [ 632.233786][ C0] NMI backtrace for cpu 0 [ 632.238098][ C0] CPU: 0 PID: 6928 Comm: syz-executor693 Not tainted 5.15.0-rc6-syzkaller #0 [ 632.246854][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 632.256999][ C0] Call Trace: [ 632.260275][ C0] [ 632.263110][ C0] dump_stack_lvl+0xcd/0x134 [ 632.267699][ C0] nmi_cpu_backtrace.cold+0x47/0x144 [ 632.272987][ C0] ? lapic_can_unplug_cpu+0x80/0x80 [ 632.278186][ C0] nmi_trigger_cpumask_backtrace+0x1ae/0x220 [ 632.284172][ C0] rcu_check_gp_kthread_starvation.cold+0x1fb/0x200 [ 632.290763][ C0] ? do_raw_spin_unlock+0x171/0x230 [ 632.295962][ C0] rcu_sched_clock_irq+0x2125/0x2200 [ 632.301345][ C0] ? rcutree_dead_cpu+0x30/0x30 [ 632.306195][ C0] ? get_cpu_iowait_time_us+0x371/0x3f0 [ 632.311739][ C0] ? find_held_lock+0x2d/0x110 [ 632.316504][ C0] ? __sanitizer_cov_trace_const_cmp1+0x22/0x80 [ 632.322748][ C0] ? hrtimer_run_queues+0x93/0x400 [ 632.327859][ C0] update_process_times+0x16d/0x200 [ 632.333055][ C0] tick_sched_handle+0x9b/0x180 [ 632.337908][ C0] tick_sched_timer+0x1b0/0x2d0 [ 632.342758][ C0] ? get_cpu_iowait_time_us+0x3f0/0x3f0 [ 632.348300][ C0] __hrtimer_run_queues+0x1c0/0xe50 [ 632.353507][ C0] ? hrtimer_sleeper_start_expires+0x80/0x80 [ 632.359485][ C0] ? ktime_get_update_offsets_now+0x3eb/0x5c0 [ 632.365554][ C0] hrtimer_interrupt+0x31c/0x790 [ 632.370496][ C0] __sysvec_apic_timer_interrupt+0x146/0x530 [ 632.376476][ C0] sysvec_apic_timer_interrupt+0x8e/0xc0 [ 632.382109][ C0] [ 632.385035][ C0] asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 632.391016][ C0] RIP: 0010:__schedule+0xb4c/0x5960 [ 632.396212][ C0] Code: fa 48 c1 ea 03 80 3c 02 00 0f 85 70 4a 00 00 48 8b bd 40 ff ff ff 4c 89 63 10 4c 89 e6 e8 0c 9c c8 f7 48 89 c7 e8 d4 88 18 f8 <48> 8b b5 e8 fe ff ff 48 b8 00 00 00 00 00 fc ff df 48 c7 04 06 00 [ 632.415816][ C0] RSP: 0018:ffffc9000343f738 EFLAGS: 00000206 [ 632.421967][ C0] RAX: 0000000000f3b0f9 RBX: 0000000000000001 RCX: 1ffffffff1adcad9 [ 632.429935][ C0] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 [ 632.438079][ C0] RBP: ffffc9000343f888 R08: 0000000000000001 R09: 0000000000000001 [ 632.446268][ C0] R10: ffffffff817d01e8 R11: 0000000000000000 R12: ffff8880b9c32500 [ 632.454235][ C0] R13: 0000000000000000 R14: ffffffff8b332cc0 R15: ffffffff8b332cc0 [ 632.462295][ C0] ? trace_hardirqs_on+0x38/0x1c0 [ 632.467329][ C0] ? __schedule+0x3848/0x5960 [ 632.472002][ C0] ? lockdep_hardirqs_on+0x79/0x100 [ 632.477200][ C0] ? _raw_spin_unlock_irqrestore+0x3d/0x70 [ 632.483019][ C0] ? slab_free_freelist_hook+0x8b/0x1c0 [ 632.488569][ C0] ? io_schedule_timeout+0x140/0x140 [ 632.493848][ C0] ? tty_open+0x7e0/0x1000 [ 632.498260][ C0] ? kfree+0xf3/0x550 [ 632.502598][ C0] schedule+0xd3/0x270 [ 632.506842][ C0] tty_open+0x885/0x1000 [ 632.511093][ C0] ? tty_init_dev+0x80/0x80 [ 632.515599][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 632.520547][ C0] ? tty_init_dev+0x80/0x80 [ 632.525053][ C0] chrdev_open+0x266/0x770 [ 632.529470][ C0] ? cdev_device_add+0x210/0x210 [ 632.534405][ C0] ? fsnotify_perm.part.0+0x22d/0x620 [ 632.539786][ C0] do_dentry_open+0x4c8/0x11d0 [ 632.544554][ C0] ? cdev_device_add+0x210/0x210 [ 632.549493][ C0] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 632.555740][ C0] ? may_open+0x1f6/0x420 [ 632.560077][ C0] path_openat+0x1c9a/0x2740 [ 632.564675][ C0] ? path_lookupat+0x860/0x860 [ 632.569438][ C0] ? irqentry_enter+0x28/0x50 [ 632.574121][ C0] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 632.580125][ C0] do_filp_open+0x1aa/0x400 [ 632.584641][ C0] ? may_open_dev+0xf0/0xf0 [ 632.589155][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 632.594093][ C0] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 632.600340][ C0] ? _find_next_bit+0x1e3/0x260 [ 632.605201][ C0] ? _raw_spin_unlock+0x24/0x40 [ 632.610052][ C0] ? alloc_fd+0x2f0/0x670 [ 632.614390][ C0] do_sys_openat2+0x16d/0x4d0 [ 632.619076][ C0] ? build_open_flags+0x6f0/0x6f0 [ 632.624106][ C0] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 632.630909][ C0] __x64_sys_openat+0x13f/0x1f0 [ 632.638015][ C0] ? __ia32_sys_open+0x1c0/0x1c0 [ 632.642949][ C0] ? syscall_enter_from_user_mode+0x2b/0x70 [ 632.648839][ C0] do_syscall_64+0x35/0xb0 [ 632.653248][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 632.659139][ C0] RIP: 0033:0x7f4a6ad6dae9 [ 632.663546][ C0] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 [ 632.683147][ C0] RSP: 002b:00007f4a6ad1f318 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 [ 632.691551][ C0] RAX: ffffffffffffffda RBX: 00007f4a6adf53e8 RCX: 00007f4a6ad6dae9 [ 632.699513][ C0] RDX: 0000000000000802 RSI: 0000000020000840 RDI: ffffffffffffff9c [ 632.707477][ C0] RBP: 00007f4a6adf53e0 R08: 0000000000000000 R09: 0000000000000000 [ 632.715437][ C0] R10: 0000000000000000 R11: 0000000000000246 R12: 7974742f7665642f [ 632.723397][ C0] R13: 00007ffced9fca0f R14: 00007f4a6ad1f400 R15: 0000000000022000 [ 632.731822][ C0] sched: RT throttling activated