[[0;32m OK [0m] Reached target Login Prompts.
[[0;32m OK [0m] Reached target Multi-User System.
[[0;32m OK [0m] Reached target Graphical Interface.
Starting Update UTMP about System Runlevel Changes...
[[0;32m OK [0m] Started Update UTMP about System Runlevel Changes.
Debian GNU/Linux 9 syzkaller ttyS0
Warning: Permanently added '10.128.1.216' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [ 302.536955][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU
[ 302.543657][ C0] rcu: 0-....: (10499 ticks this GP) idle=91d/1/0x4000000000000000 softirq=9714/9714 fqs=3884
[ 302.554292][ C0] (t=10500 jiffies g=11093 q=47)
[ 302.559385][ C0] NMI backtrace for cpu 0
[ 302.563713][ C0] CPU: 0 PID: 6487 Comm: syz-executor141 Not tainted 5.15.0-rc7-next-20211029-syzkaller #0
[ 302.573691][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 302.583745][ C0] Call Trace:
[ 302.587027][ C0]
[ 302.589871][ C0] dump_stack_lvl+0xcd/0x134
[ 302.594587][ C0] nmi_cpu_backtrace.cold+0x47/0x144
[ 302.599886][ C0] ? lapic_can_unplug_cpu+0x80/0x80
[ 302.605125][ C0] nmi_trigger_cpumask_backtrace+0x1ae/0x220
[ 302.611179][ C0] rcu_dump_cpu_stacks+0x25e/0x3f0
[ 302.616379][ C0] rcu_sched_clock_irq.cold+0x9d/0x746
[ 302.621866][ C0] ? memcpy+0x39/0x60
[ 302.625895][ C0] ? memcpy+0x39/0x60
[ 302.629888][ C0] ? rcutree_dead_cpu+0x30/0x30
[ 302.634745][ C0] ? do_raw_spin_unlock+0x171/0x230
[ 302.639968][ C0] ? _raw_spin_unlock_irqrestore+0x3d/0x70
[ 302.645848][ C0] update_process_times+0x16d/0x200
[ 302.651088][ C0] tick_sched_handle+0x9b/0x180
[ 302.656005][ C0] tick_sched_timer+0x1b0/0x2d0
[ 302.660877][ C0] ? get_cpu_iowait_time_us+0x3f0/0x3f0
[ 302.666441][ C0] __hrtimer_run_queues+0x1c0/0xe50
[ 302.671663][ C0] ? hrtimer_sleeper_start_expires+0x80/0x80
[ 302.677656][ C0] ? ktime_get_update_offsets_now+0x3eb/0x5c0
[ 302.683746][ C0] hrtimer_interrupt+0x31c/0x790
[ 302.688712][ C0] __sysvec_apic_timer_interrupt+0x146/0x530
[ 302.694728][ C0] sysvec_apic_timer_interrupt+0x8e/0xc0
[ 302.700383][ C0]
[ 302.703313][ C0]
[ 302.706240][ C0] asm_sysvec_apic_timer_interrupt+0x12/0x20
[ 302.712224][ C0] RIP: 0010:do_raw_spin_unlock+0x101/0x230
[ 302.718041][ C0] Code: 8e fc 00 00 00 65 8b 05 e5 c5 a4 7e 39 45 08 0f 85 b5 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 00 <0f> 85 f5 00 00 00 4c 89 e2 48 c7 45 10 ff ff ff ff 48 b8 00 00 00
[ 302.737651][ C0] RSP: 0018:ffffc90002a8fcc8 EFLAGS: 00000246
[ 302.743727][ C0] RAX: dffffc0000000000 RBX: ffff88801a315950 RCX: ffffffff815d4f10
[ 302.751704][ C0] RDX: 1ffff1100449ce7a RSI: 0000000000000004 RDI: ffff8880224e73c0
[ 302.759685][ C0] RBP: ffff8880224e73c0 R08: 0000000000000000 R09: ffff8880224e73c3
[ 302.767663][ C0] R10: ffffed100449ce78 R11: 0000000000000000 R12: ffff8880224e73c8
[ 302.775638][ C0] R13: ffff8880224e73d0 R14: ffff88801a315918 R15: ffff88801a3158c0
[ 302.783625][ C0] ? do_raw_spin_unlock+0x50/0x230
[ 302.788758][ C0] ? do_raw_spin_unlock+0x50/0x230
[ 302.793881][ C0] _raw_spin_unlock+0x1a/0x40
[ 302.798574][ C0] tctx_task_work+0x1b3/0x630
[ 302.803348][ C0] ? __io_submit_flush_completions+0x2c0/0x2c0
[ 302.809527][ C0] task_work_run+0xdd/0x1a0
[ 302.814107][ C0] do_exit+0xc14/0x2b40
[ 302.818335][ C0] ? lock_downgrade+0x6e0/0x6e0
[ 302.823200][ C0] ? lock_downgrade+0x6e0/0x6e0
[ 302.828065][ C0] ? mm_update_next_owner+0x7a0/0x7a0
[ 302.833459][ C0] do_group_exit+0x125/0x310
[ 302.838065][ C0] __x64_sys_exit_group+0x3a/0x50
[ 302.843098][ C0] do_syscall_64+0x35/0xb0
[ 302.847520][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 302.853419][ C0] RIP: 0033:0x7fe6950481a9
[ 302.857837][ C0] Code: Unable to access opcode bytes at RIP 0x7fe69504817f.
[ 302.865191][ C0] RSP: 002b:00007ffc42a91cb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[ 302.873604][ C0] RAX: ffffffffffffffda RBX: 00007fe6950bc330 RCX: 00007fe6950481a9
[ 302.881577][ C0] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000
[ 302.889547][ C0] RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 00000000f5ffffff
[ 302.897519][ C0] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe6950bc330
[ 302.905489][ C0] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001
[ 302.913479][ C0]