Warning: Permanently added '10.128.1.108' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 310.257216] hrtimer: interrupt took 31664 ns executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 415.892287] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: [ 415.898647] rcu: (detected by 1, t=10502 jiffies, g=4301, q=93) [ 415.904798] rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294978587-4294968085), jiffies_till_next_fqs=1, root ->qsmask 0x0 [ 415.917880] syz-executor438 R running task 26904 8296 8092 0x00000000 [ 415.925100] Call Trace: [ 415.927678] [ 415.929834] sched_show_task.cold+0x332/0x396 [ 415.934330] ? __se_sys_sched_getattr+0x480/0x480 [ 415.939199] rcu_check_callbacks.cold+0xb37/0xe19 [ 415.944056] update_process_times+0x2a/0x70 [ 415.948378] tick_sched_handle+0x9b/0x180 [ 415.952525] tick_sched_timer+0xfc/0x290 [ 415.956591] __hrtimer_run_queues+0x3f6/0xe60 [ 415.961097] ? tick_nohz_restart_sched_tick+0x310/0x310 [ 415.966462] ? hrtimer_fixup_free+0xa0/0xa0 [ 415.970784] ? kvm_clock_get_cycles+0x14/0x30 [ 415.975273] ? ktime_get_update_offsets_now+0x2ec/0x460 [ 415.980653] hrtimer_interrupt+0x326/0x9e0 [ 415.984901] smp_apic_timer_interrupt+0x10c/0x550 [ 415.989745] apic_timer_interrupt+0xf/0x20 [ 415.993973] [ 415.996211] RIP: 0010:unwind_next_frame+0xe40/0x1400 [ 416.001428] Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 28 03 00 00 4d 89 66 40 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 0f b6 04 02 <84> c0 74 08 3c 03 0f 8e a0 03 00 00 41 39 2e 0f 85 8f 00 00 00 48 [ 416.020328] RSP: 0018:ffff888094be74b8 EFLAGS: 00000a06 ORIG_RAX: ffffffffffffff13 [ 416.028032] RAX: 0000000000000000 RBX: 1ffff1101297cea0 RCX: 0000000000000000 [ 416.035298] RDX: 1ffff1101297cebd RSI: ffff888094be7448 RDI: ffff888094be7f38 [ 416.042579] RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000001 [ 416.050362] R10: ffff888094be7647 R11: 0000000000074071 R12: ffff888094be7f58 [ 416.057623] R13: ffff888094be761d R14: ffff888094be75e8 R15: ffffffff8b8cd904 [ 416.064907] ? unwind_next_frame+0xf83/0x1400 [ 416.069398] ? do_syscall_64+0xf9/0x620 [ 416.073371] ? deref_stack_reg+0x1d0/0x1d0 [ 416.077598] ? __unwind_start+0x5b8/0x960 [ 416.081746] ? unwind_next_frame+0x1400/0x1400 [ 416.086847] ? do_syscall_64+0xf9/0x620 [ 416.090823] __save_stack_trace+0x9f/0x190 [ 416.095061] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 416.100421] kasan_kmalloc+0xeb/0x160 [ 416.104218] ? kmem_cache_alloc_trace+0x11a/0x380 [ 416.109057] ? tty_open+0x138/0x990 [ 416.112679] ? chrdev_open+0x266/0x770 [ 416.116558] ? do_dentry_open+0x4aa/0x1160 [ 416.120787] ? path_openat+0x793/0x2df0 [ 416.124753] ? do_filp_open+0x18c/0x3f0 [ 416.128721] ? do_sys_open+0x3b3/0x520 [ 416.132600] ? do_syscall_64+0xf9/0x620 [ 416.136571] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 416.141149] ? mark_held_locks+0xf0/0xf0 [ 416.145209] ? rcu_nmi_exit+0xb3/0x180 [ 416.149101] ? retint_kernel+0x2d/0x2d [ 416.152994] ? fs_reclaim_release+0xd0/0x110 [ 416.157398] ? lock_acquire+0x170/0x3c0 [ 416.161375] ? kmem_cache_alloc_trace+0x2be/0x380 [ 416.166214] kmem_cache_alloc_trace+0x11a/0x380 [ 416.170886] tty_open+0x138/0x990 [ 416.174338] ? tty_kopen+0x220/0x220 [ 416.178041] ? chrdev_open+0x7c/0x770 [ 416.181858] ? tty_kopen+0x220/0x220 [ 416.185566] chrdev_open+0x266/0x770 [ 416.189274] ? lockref_get+0x11/0x50 [ 416.192984] ? __register_chrdev+0x400/0x400 [ 416.197387] ? check_preemption_disabled+0x41/0x280 [ 416.202408] do_dentry_open+0x4aa/0x1160 [ 416.206466] ? __register_chrdev+0x400/0x400 [ 416.210877] ? inode_permission.part.0+0x10c/0x450 [ 416.215800] ? chown_common+0x550/0x550 [ 416.219768] ? inode_permission+0x3d/0x140 [ 416.224003] path_openat+0x793/0x2df0 [ 416.227806] ? path_lookupat+0x8d0/0x8d0 [ 416.231864] ? retint_kernel+0x2d/0x2d [ 416.235748] ? expand_files+0x124/0x890 [ 416.239715] ? expand_files+0x481/0x890 [ 416.243687] do_filp_open+0x18c/0x3f0 [ 416.247489] ? may_open_dev+0xf0/0xf0 [ 416.251288] ? lock_downgrade+0x720/0x720 [ 416.255431] ? do_raw_spin_unlock+0x171/0x230 [ 416.259921] ? _raw_spin_unlock+0x29/0x40 [ 416.264061] ? __alloc_fd+0x28d/0x570 [ 416.267867] do_sys_open+0x3b3/0x520 [ 416.271581] ? filp_open+0x70/0x70 [ 416.275119] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 416.280480] ? trace_hardirqs_off_caller+0x6e/0x210 [ 416.285498] ? do_syscall_64+0x21/0x620 [ 416.289471] do_syscall_64+0xf9/0x620 [ 416.293270] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 416.298450] RIP: 0033:0x7f0abc52faf9 [ 416.302165] 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 [ 416.321065] RSP: 002b:00007f0abc4e1318 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 [ 416.328883] RAX: ffffffffffffffda RBX: 00007f0abc5b73e8 RCX: 00007f0abc52faf9 [ 416.336145] RDX: 0000000000000802 RSI: 0000000020000840 RDI: ffffffffffffff9c [ 416.343418] RBP: 00007f0abc5b73e0 R08: 0000000000000000 R09: 0000000000000000 [ 416.350684] R10: 0000000000000000 R11: 0000000000000246 R12: 7974742f7665642f [ 416.357951] R13: 00007fff488ba54f R14: 00007f0abc4e1400 R15: 0000000000022000 [ 416.365241] rcu: rcu_preempt kthread starved for 10502 jiffies! g4301 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 [ 416.375627] rcu: RCU grace-period kthread stack dump: [ 416.380804] rcu_preempt R running task 29760 10 2 0x80000000 [ 416.388002] Call Trace: [ 416.390595] __schedule+0x887/0x2040 [ 416.394313] ? io_schedule_timeout+0x140/0x140 [ 416.398900] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 416.404017] schedule+0x8d/0x1b0 [ 416.407378] schedule_timeout+0x4cf/0xfe0 [ 416.411522] ? prepare_to_swait_event+0x5b/0x540 [ 416.416356] ? usleep_range+0x170/0x170 [ 416.420330] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 416.425435] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 416.430014] ? collect_expired_timers+0x2a0/0x2a0 [ 416.434884] ? swake_up_all+0x340/0x340 [ 416.438863] rcu_gp_kthread+0xdad/0x21c0 [ 416.442933] ? lock_acquire+0x170/0x3c0 [ 416.447006] ? __rcu_read_unlock+0x160/0x160 [ 416.451420] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 416.456519] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 416.461099] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 416.466214] ? __kthread_parkme+0x133/0x1e0 [ 416.470532] ? __rcu_read_unlock+0x160/0x160 [ 416.474935] kthread+0x33f/0x460 [ 416.478296] ? kthread_park+0x180/0x180 [ 416.482441] ret_from_fork+0x24/0x30