[[0;32m OK [0m] Reached target Graphical Interface.
Starting Update UTMP about System Runlevel Changes...
Starting Load/Save RF Kill Switch Status...
[[0;32m OK [0m] Started Update UTMP about System Runlevel Changes.
[[0;32m OK [0m] Started Load/Save RF Kill Switch Status.
Debian GNU/Linux 9 syzkaller ttyS0
Warning: Permanently added '10.128.15.205' (ECDSA) to the list of known hosts.
executing program
executing program
executing program
syzkaller login: [ 953.734969][ C0] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
[ 953.742119][ C0] (detected by 0, t=10502 jiffies, g=11281, q=21)
[ 953.748625][ C0] rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4295032521-4295022019), jiffies_till_next_fqs=1, root ->qsmask 0x0
[ 953.761988][ C0] rcu: rcu_preempt kthread starved for 10502 jiffies! g11281 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
[ 953.773197][ C0] rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
[ 953.783165][ C0] rcu: RCU grace-period kthread stack dump:
[ 953.789047][ C0] task:rcu_preempt state:R running task stack:28688 pid: 14 ppid: 2 flags:0x00004000
[ 953.799831][ C0] Call Trace:
[ 953.803111][ C0]
[ 953.806045][ C0] __schedule+0xa9a/0x4940
[ 953.810616][ C0] ? lockdep_hardirqs_on+0x79/0x100
[ 953.815825][ C0] ? _raw_spin_unlock_irqrestore+0x3d/0x70
[ 953.821655][ C0] ? io_schedule_timeout+0x180/0x180
[ 953.826958][ C0] ? debug_object_destroy+0x210/0x210
[ 953.832407][ C0] schedule+0xd2/0x260
[ 953.836489][ C0] schedule_timeout+0x14a/0x2a0
[ 953.841369][ C0] ? usleep_range+0x170/0x170
[ 953.846055][ C0] ? destroy_timer_on_stack+0x20/0x20
[ 953.851520][ C0] ? dvb_usbv2_probe.cold+0x1c96/0x2fa9
[ 953.857134][ C0] ? _raw_spin_unlock_irqrestore+0x3d/0x70
[ 953.862951][ C0] ? prepare_to_swait_event+0xee/0x470
[ 953.868468][ C0] rcu_gp_fqs_loop+0x186/0x810
[ 953.873281][ C0] ? force_qs_rnp+0x760/0x760
[ 953.878057][ C0] ? rcu_gp_init+0x90b/0x12a0
[ 953.882757][ C0] rcu_gp_kthread+0x1de/0x320
[ 953.887534][ C0] ? rcu_gp_init+0x12a0/0x12a0
[ 953.892310][ C0] ? __sanitizer_cov_trace_const_cmp1+0x22/0x80
[ 953.898618][ C0] ? __kthread_parkme+0x15f/0x220
[ 953.903707][ C0] ? rcu_gp_init+0x12a0/0x12a0
[ 953.908483][ C0] kthread+0x405/0x4f0
[ 953.912564][ C0] ? set_kthread_struct+0x130/0x130
[ 953.917777][ C0] ret_from_fork+0x1f/0x30
[ 953.922239][ C0]
[ 953.925254][ C0] rcu: Stack dump where RCU GP kthread last ran:
[ 953.931624][ C0] NMI backtrace for cpu 0
[ 953.935946][ C0] CPU: 0 PID: 8 Comm: kworker/u4:0 Not tainted 5.15.0-rc7-next-20211029-syzkaller #0
[ 953.945405][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 953.955460][ C0] Workqueue: events_unbound io_ring_exit_work
[ 953.961576][ C0] Call Trace:
[ 953.964859][ C0]
[ 953.967703][ C0] dump_stack_lvl+0xcd/0x134
[ 953.972374][ C0] nmi_cpu_backtrace.cold+0x47/0x144
[ 953.977673][ C0] ? lapic_can_unplug_cpu+0x80/0x80
[ 953.982917][ C0] nmi_trigger_cpumask_backtrace+0x1ae/0x220
[ 953.988970][ C0] rcu_check_gp_kthread_starvation.cold+0x1fb/0x200
[ 953.995855][ C0] rcu_sched_clock_irq+0x2125/0x2200
[ 954.001166][ C0] ? rcutree_dead_cpu+0x30/0x30
[ 954.006030][ C0] ? do_raw_spin_unlock+0x171/0x230
[ 954.011260][ C0] ? _raw_spin_unlock_irqrestore+0x3d/0x70
[ 954.017080][ C0] ? timekeeping_advance+0x978/0xe30
[ 954.022430][ C0] ? __sanitizer_cov_trace_const_cmp1+0x22/0x80
[ 954.028685][ C0] ? hrtimer_run_queues+0x93/0x400
[ 954.033810][ C0] update_process_times+0x16d/0x200
[ 954.039019][ C0] tick_sched_handle+0x9b/0x180
[ 954.043940][ C0] tick_sched_timer+0x1b0/0x2d0
[ 954.048994][ C0] ? get_cpu_iowait_time_us+0x3f0/0x3f0
[ 954.054561][ C0] __hrtimer_run_queues+0x1c0/0xe50
[ 954.059789][ C0] ? hrtimer_sleeper_start_expires+0x80/0x80
[ 954.065776][ C0] ? ktime_get_update_offsets_now+0x3eb/0x5c0
[ 954.071874][ C0] hrtimer_interrupt+0x31c/0x790
[ 954.076832][ C0] __sysvec_apic_timer_interrupt+0x146/0x530
[ 954.082862][ C0] sysvec_apic_timer_interrupt+0x8e/0xc0
[ 954.088507][ C0]
[ 954.091438][ C0]
[ 954.094369][ C0] asm_sysvec_apic_timer_interrupt+0x12/0x20
[ 954.100357][ C0] RIP: 0010:__sanitizer_cov_trace_cmp8+0x0/0x70
[ 954.106870][ C0] Code: fe 72 22 44 89 c6 48 83 c2 01 48 89 4c 38 f0 48 c7 44 38 e0 04 00 00 00 48 89 74 38 e8 4e 89 54 c8 20 48 89 10 c3 0f 1f 40 00 <49> 89 f8 bf 03 00 00 00 4c 8b 14 24 48 89 f1 65 48 8b 34 25 40 70
[ 954.126480][ C0] RSP: 0018:ffffc90000cd7a40 EFLAGS: 00000207
[ 954.132553][ C0] RAX: 0000000000000000 RBX: ffff888081a80cc0 RCX: 0000000000000000
[ 954.140526][ C0] RDX: ffff888010a657c0 RSI: 0000000081a80cc0 RDI: ffff888101a80cc0
[ 954.148500][ C0] RBP: ffff888101a80cc0 R08: ffff888081a80cc0 R09: ffffffff8fa48acf
[ 954.156565][ C0] R10: ffffffff81350cb8 R11: 000000000000003f R12: 0000000081a80cc0
[ 954.164538][ C0] R13: ffffffff81bdef86 R14: ffffc90000cd7b18 R15: ffff888081a80cc0
[ 954.172514][ C0] ? kfree+0xf6/0x560
[ 954.176571][ C0] ? __phys_addr+0x28/0x140
[ 954.181109][ C0] __phys_addr+0x4e/0x140
[ 954.185449][ C0] ? kfree+0xf6/0x560
[ 954.189436][ C0] __kasan_slab_free+0x38/0x130
[ 954.194295][ C0] slab_free_freelist_hook+0x8b/0x1c0
[ 954.199704][ C0] ? __io_remove_buffers.part.0+0x115/0x220
[ 954.205652][ C0] kfree+0xf6/0x560
[ 954.209464][ C0] ? __io_remove_buffers.part.0+0x64/0x220
[ 954.215290][ C0] __io_remove_buffers.part.0+0x115/0x220
[ 954.221026][ C0] io_ring_exit_work+0x74d/0xbe8
[ 954.225988][ C0] ? io_sq_thread_finish+0x1f6/0x1f6
[ 954.231636][ C0] ? io_uring_del_tctx_node+0x20a/0x20a
[ 954.237222][ C0] process_one_work+0x9b2/0x1690
[ 954.242191][ C0] ? pwq_dec_nr_in_flight+0x2a0/0x2a0
[ 954.247581][ C0] ? rwlock_bug.part.0+0x90/0x90
[ 954.252531][ C0] ? _raw_spin_lock_irq+0x41/0x50
[ 954.257579][ C0] worker_thread+0x658/0x11f0
[ 954.262277][ C0] ? process_one_work+0x1690/0x1690
[ 954.267486][ C0] kthread+0x405/0x4f0
[ 954.271564][ C0] ? set_kthread_struct+0x130/0x130
[ 954.276776][ C0] ret_from_fork+0x1f/0x30
[ 954.281218][ C0]