[[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 Load/Save RF Kill Switch Status.
[[0;32m OK [0m] Started Update UTMP about System Runlevel Changes.
Debian GNU/Linux 9 syzkaller ttyS0
Warning: Permanently added '10.128.0.170' (ECDSA) to the list of known hosts.
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syzkaller login: [ 466.745477] hrtimer: interrupt took 33904 ns
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[ 572.686855] INFO: rcu_preempt detected stalls on CPUs/tasks:
[ 572.692733] (detected by 0, t=10502 jiffies, g=1144, c=1143, q=65)
[ 572.699144] All QSes seen, last rcu_preempt kthread activity 10502 (4294994573-4294984071), jiffies_till_next_fqs=1, root ->qsmask 0x0
[ 572.711356] syz-executor271 R running task 27976 8228 7974 0x00000000
[ 572.718560] Call Trace:
[ 572.721142]
[ 572.723288] sched_show_task.cold+0x333/0x39a
[ 572.727778] rcu_check_callbacks.cold+0xd29/0xd8d
[ 572.732642] ? __raise_softirq_irqoff+0x14e/0x1d0
[ 572.737484] update_process_times+0x29/0x60
[ 572.741799] tick_sched_handle+0x7d/0x150
[ 572.745938] tick_sched_timer+0x92/0x200
[ 572.749990] __hrtimer_run_queues+0x30b/0xc80
[ 572.754478] ? tick_do_update_jiffies64.part.0+0x270/0x270
[ 572.760106] ? retrigger_next_event+0x310/0x310
[ 572.764784] ? ktime_get_update_offsets_now+0x272/0x3f0
[ 572.770146] hrtimer_interrupt+0x1e6/0x5e0
[ 572.774382] smp_apic_timer_interrupt+0x117/0x5e0
[ 572.779218] apic_timer_interrupt+0x93/0xa0
[ 572.783529]
[ 572.785757] RIP: 0010:__mutex_unlock_slowpath+0x261/0x770
[ 572.791281] RSP: 0018:ffff8880aaa57928 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10
[ 572.798981] RAX: ffff88809df1c240 RBX: 0000000000000000 RCX: fffffbfff17d93a8
[ 572.806244] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000286
[ 572.813520] RBP: ffffffff89472920 R08: ffff88809df1c240 R09: dffffc0000000000
[ 572.820782] R10: 0000000000000000 R11: ffff88809df1c240 R12: ffffffff8bec9d40
[ 572.828053] R13: 1ffff1101554af29 R14: ffff8880aaa57968 R15: 0000000000000003
[ 572.835329] ? __mutex_unlock_slowpath+0x75/0x770
[ 572.840170] ? wait_for_completion_io+0x10/0x10
[ 572.844835] tty_open+0x3d5/0x8b0
[ 572.848284] ? tty_kopen+0x1c0/0x1c0
[ 572.851991] ? tty_kopen+0x1c0/0x1c0
[ 572.855696] chrdev_open+0x23c/0x6d0
[ 572.859398] ? __register_chrdev+0x3d0/0x3d0
[ 572.863803] do_dentry_open+0x44b/0xec0
[ 572.867764] ? __register_chrdev+0x3d0/0x3d0
[ 572.872165] ? __inode_permission+0xcd/0x2f0
[ 572.876567] vfs_open+0x105/0x220
[ 572.880017] path_openat+0x628/0x2970
[ 572.883819] ? path_lookupat+0x780/0x780
[ 572.887877] do_filp_open+0x179/0x3c0
[ 572.891693] ? may_open_dev+0xe0/0xe0
[ 572.895494] ? lock_downgrade+0x740/0x740
[ 572.899634] ? do_raw_spin_unlock+0x164/0x220
[ 572.904123] ? _raw_spin_unlock+0x29/0x40
[ 572.908260] ? __alloc_fd+0x1be/0x490
[ 572.912057] do_sys_open+0x296/0x410
[ 572.915778] ? filp_open+0x60/0x60
[ 572.919311] ? do_syscall_64+0x4c/0x640
[ 572.923273] ? SyS_open+0x30/0x30
[ 572.926721] do_syscall_64+0x1d5/0x640
[ 572.930604] entry_SYSCALL_64_after_hwframe+0x46/0xbb
[ 572.935784] RIP: 0033:0x7f0578eadaf9
[ 572.939486] RSP: 002b:00007f0578e5f318 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
[ 572.947203] RAX: ffffffffffffffda RBX: 00007f0578f353e8 RCX: 00007f0578eadaf9
[ 572.954462] RDX: 0000000000000802 RSI: 0000000020000840 RDI: ffffffffffffff9c
[ 572.961721] RBP: 00007f0578f353e0 R08: 0000000000000000 R09: 0000000000000000
[ 572.968980] R10: 0000000000000000 R11: 0000000000000246 R12: 7974742f7665642f
[ 572.976240] R13: 00007fffc41d99af R14: 00007f0578e5f400 R15: 0000000000022000
[ 572.983518] rcu_preempt kthread starved for 10502 jiffies! g1144 c1143 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0
[ 572.993991] rcu_preempt R running task 30008 8 2 0x80000000
[ 573.001185] Call Trace:
[ 573.003768] __schedule+0x88b/0x1de0
[ 573.007474] ? schedule_timeout+0x4a5/0xe90
[ 573.011786] ? io_schedule_timeout+0x140/0x140
[ 573.016359] ? _raw_spin_unlock_irqrestore+0x79/0xe0
[ 573.021457] schedule+0x8d/0x1b0
[ 573.024832] schedule_timeout+0x4af/0xe90
[ 573.028972] ? _raw_spin_unlock_irqrestore+0x79/0xe0
[ 573.034068] ? usleep_range+0x130/0x130
[ 573.038035] ? _raw_spin_unlock_irqrestore+0x66/0xe0
[ 573.043131] ? prepare_to_swait+0x115/0x2a0
[ 573.047443] ? run_timer_softirq+0x5a0/0x5a0
[ 573.051853] rcu_gp_kthread+0xc0a/0x1e60
[ 573.055916] ? force_qs_rnp+0x4f0/0x4f0
[ 573.059887] ? force_qs_rnp+0x4f0/0x4f0
[ 573.063858] kthread+0x30d/0x420
[ 573.067222] ? kthread_create_on_node+0xd0/0xd0
[ 573.071914] ret_from_fork+0x24/0x30
[ 573.075768] INFO: rcu_sched detected stalls on CPUs/tasks:
[ 573.081386] (detected by 0, t=10539 jiffies, g=297, c=296, q=5)
[ 573.087535] All QSes seen, last rcu_sched kthread activity 10539 (4294994611-4294984072), jiffies_till_next_fqs=1, root ->qsmask 0x0
[ 573.099572] syz-executor271 R running task 27976 8228 7974 0x00000000
[ 573.106766] Call Trace:
[ 573.109335]
[ 573.111488] sched_show_task.cold+0x333/0x39a
[ 573.115979] rcu_check_callbacks.cold+0xd29/0xd8d
[ 573.120827] ? __raise_softirq_irqoff+0x14e/0x1d0
[ 573.125664] update_process_times+0x29/0x60
[ 573.129979] tick_sched_handle+0x7d/0x150
[ 573.134137] tick_sched_timer+0x92/0x200
[ 573.138197] __hrtimer_run_queues+0x30b/0xc80
[ 573.142692] ? tick_do_update_jiffies64.part.0+0x270/0x270
[ 573.148321] ? retrigger_next_event+0x310/0x310
[ 573.152998] ? ktime_get_update_offsets_now+0x272/0x3f0
[ 573.158362] hrtimer_interrupt+0x1e6/0x5e0
[ 573.162601] smp_apic_timer_interrupt+0x117/0x5e0
[ 573.167437] apic_timer_interrupt+0x93/0xa0
[ 573.171746]
[ 573.174001] RIP: 0010:__mutex_unlock_slowpath+0x261/0x770
[ 573.179528] RSP: 0018:ffff8880aaa57928 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10
[ 573.187225] RAX: ffff88809df1c240 RBX: 0000000000000000 RCX: fffffbfff17d93a8
[ 573.194482] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000286
[ 573.201916] RBP: ffffffff89472920 R08: ffff88809df1c240 R09: dffffc0000000000
[ 573.209198] R10: 0000000000000000 R11: ffff88809df1c240 R12: ffffffff8bec9d40
[ 573.216477] R13: 1ffff1101554af29 R14: ffff8880aaa57968 R15: 0000000000000003
[ 573.223754] ? __mutex_unlock_slowpath+0x75/0x770
[ 573.228604] ? wait_for_completion_io+0x10/0x10
[ 573.233278] tty_open+0x3d5/0x8b0
[ 573.236726] ? tty_kopen+0x1c0/0x1c0
[ 573.240434] ? tty_kopen+0x1c0/0x1c0
[ 573.244142] chrdev_open+0x23c/0x6d0
[ 573.247849] ? __register_chrdev+0x3d0/0x3d0
[ 573.252260] do_dentry_open+0x44b/0xec0
[ 573.256227] ? __register_chrdev+0x3d0/0x3d0
[ 573.260642] ? __inode_permission+0xcd/0x2f0
[ 573.265051] vfs_open+0x105/0x220
[ 573.268512] path_openat+0x628/0x2970
[ 573.272323] ? path_lookupat+0x780/0x780
[ 573.276388] do_filp_open+0x179/0x3c0
[ 573.280180] ? may_open_dev+0xe0/0xe0
[ 573.283985] ? lock_downgrade+0x740/0x740
[ 573.288130] ? do_raw_spin_unlock+0x164/0x220
[ 573.292626] ? _raw_spin_unlock+0x29/0x40
[ 573.296766] ? __alloc_fd+0x1be/0x490
[ 573.300566] do_sys_open+0x296/0x410
[ 573.304271] ? filp_open+0x60/0x60
[ 573.307806] ? do_syscall_64+0x4c/0x640
[ 573.311937] ? SyS_open+0x30/0x30
[ 573.315385] do_syscall_64+0x1d5/0x640
[ 573.319279] entry_SYSCALL_64_after_hwframe+0x46/0xbb
[ 573.324461] RIP: 0033:0x7f0578eadaf9
[ 573.328206] RSP: 002b:00007f0578e5f318 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
[ 573.336040] RAX: ffffffffffffffda RBX: 00007f0578f353e8 RCX: 00007f0578eadaf9
[ 573.343301] RDX: 0000000000000802 RSI: 0000000020000840 RDI: ffffffffffffff9c
[ 573.350568] RBP: 00007f0578f353e0 R08: 0000000000000000 R09: 0000000000000000
[ 573.357832] R10: 0000000000000000 R11: 0000000000000246 R12: 7974742f7665642f
[ 573.365103] R13: 00007fffc41d99af R14: 00007f0578e5f400 R15: 0000000000022000
[ 573.372389] rcu_sched kthread starved for 10539 jiffies! g297 c296 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=1
[ 573.382516] rcu_sched R running task 30008 9 2 0x80000000
[ 573.389726] Call Trace:
[ 573.392310] __schedule+0x88b/0x1de0
[ 573.396018] ? schedule_timeout+0x4a5/0xe90
[ 573.400334] ? io_schedule_timeout+0x140/0x140
[ 573.404912] ? _raw_spin_unlock_irqrestore+0x79/0xe0
[ 573.410010] schedule+0x8d/0x1b0
[ 573.413370] schedule_timeout+0x4af/0xe90
[ 573.417515] ? _raw_spin_unlock_irqrestore+0x79/0xe0
[ 573.422612] ? usleep_range+0x130/0x130
[ 573.426575] ? _raw_spin_unlock_irqrestore+0x66/0xe0
[ 573.431673] ? prepare_to_swait+0x115/0x2a0
[ 573.435990] ? run_timer_softirq+0x5a0/0x5a0
[ 573.440398] rcu_gp_kthread+0xc0a/0x1e60
[ 573.444459] ? force_qs_rnp+0x4f0/0x4f0
[ 573.448448] ? force_qs_rnp+0x4f0/0x4f0
[ 573.452415] kthread+0x30d/0x420
[ 573.455773] ? kthread_create_on_node+0xd0/0xd0
[ 573.460434] ret_from_fork+0x24/0x30