Debian GNU/Linux 7 syzkaller ttyS0

executing program
syzkaller login: [   19.661528] BUG: unable to handle kernel NULL pointer dereference at 0000000000000055
[   19.662543] IP: 0x55
[   19.662732] PGD 0 
[   19.662734] P4D 0 
[   19.662913] 
[   19.663229] Oops: 0010 [#1] SMP KASAN
[   19.663520] Dumping ftrace buffer:
[   19.663820]    (ftrace buffer empty)
[   19.664144] Modules linked in:
[   19.664420] CPU: 0 PID: 1193 Comm: kworker/u8:1 Not tainted 4.13.0-rc5-next-20170817+ #5
[   19.665120] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
[   19.666148] Workqueue: kstrp strp_work
[   19.666671] task: ffff88006bb40900 task.stack: ffff88006bb48000
[   19.667402] RIP: 0010:0x55
[   19.667740] RSP: 0018:ffff88006bb4f540 EFLAGS: 00010246
[   19.668337] RAX: dffffc0000000000 RBX: ffff88003e3cdd60 RCX: 0000000000000000
[   19.669003] RDX: 1ffff10007c79bbd RSI: 0000000000000000 RDI: ffff88003e3cdc48
[   19.669723] RBP: ffff88006bb4f558 R08: ffffffff81464ab2 R09: 0000000000000000
[   19.670511] R10: ffff88006bb4f438 R11: ffff88006bb4f940 R12: ffff88003e3cdc48
[   19.671236] R13: ffff88003c203318 R14: ffff88006bb4f980 R15: ffff88003c203300
[   19.671935] FS:  0000000000000000(0000) GS:ffff88003ec00000(0000) knlGS:0000000000000000
[   19.672714] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   19.673271] CR2: 0000000000000055 CR3: 000000003af21000 CR4: 00000000000006f0
[   19.673953] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   19.674687] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   19.675351] Call Trace:
[   19.675612]  ? strp_work+0x41/0xf0
[   19.675941]  process_one_work+0xbf3/0x1bc0
[   19.676351]  ? pwq_dec_nr_in_flight+0x450/0x450
[   19.676808]  ? preempt_notifier_dec+0x20/0x20
[   19.677242]  ? sched_clock_cpu+0x1b/0x170
[   19.677631]  ? __schedule+0x8f0/0x2070
[   19.677985]  ? lock_acquire+0x1d5/0x580
[   19.678419]  ? lock_acquire+0x1d5/0x580
[   19.678798]  ? select_task_rq_fair+0xec9/0x3380
[   19.679228]  ? lock_downgrade+0x990/0x990
[   19.679621]  ? lock_release+0xa40/0xa40
[   19.679994]  ? lock_acquire+0x1d5/0x580
[   19.680351]  ? lock_acquire+0x1d5/0x580
[   19.680735]  ? worker_thread+0x4a3/0x1860
[   19.681134]  ? lock_downgrade+0x990/0x990
[   19.681521]  ? lock_release+0xa40/0xa40
[   19.682069]  ? do_raw_spin_trylock+0x190/0x190
[   19.682792]  ? retint_kernel+0x10/0x10
[   19.683172]  worker_thread+0x223/0x1860
[   19.683517]  ? process_one_work+0x1bc0/0x1bc0
[   19.683936]  ? pvclock_read_flags+0x160/0x160
[   19.684352]  ? __schedule+0x8b7/0x2070
[   19.684687]  ? trace_hardirqs_on+0xd/0x10
[   19.684973]  ? _raw_spin_unlock_irq+0x27/0x70
[   19.685292]  ? finish_task_switch+0x1d3/0x740
[   19.685582]  ? finish_task_switch+0x1aa/0x740
[   19.685887]  ? preempt_notifier_dec+0x20/0x20
[   19.686220]  ? sched_clock_cpu+0x104/0x170
[   19.686486]  ? __schedule+0x8f0/0x2070
[   19.686753]  ? __x2apic_send_IPI_dest.constprop.7+0x5b/0x80
[   19.687134]  ? try_to_wake_up+0xf9/0x1600
[   19.687410]  ? migrate_swap_stop+0x970/0x970
[   19.687717]  ? lock_acquire+0x1d5/0x580
[   19.687975]  ? fs_reclaim_acquire+0x20/0x20
[   19.688287]  ? lock_acquire+0x1d5/0x580
[   19.688548]  ? lock_acquire+0x1d5/0x580
[   19.688824]  ? complete+0x62/0x80
[   19.689069]  ? __schedule+0x2070/0x2070
[   19.689327]  ? __lockdep_init_map+0xe4/0x650
[   19.689617]  ? default_wake_function+0x30/0x50
[   19.689932]  ? __init_waitqueue_head+0x97/0x140
[   19.690264]  ? __wake_up_common+0xb4/0x150
[   19.690554]  ? trace_hardirqs_on+0xd/0x10
[   19.690847]  ? __kthread_parkme+0x173/0x240
[   19.691178]  kthread+0x35e/0x430
[   19.691398]  ? process_one_work+0x1bc0/0x1bc0
[   19.691711]  ? kthread_create_on_node+0x100/0x100
[   19.692035]  ret_from_fork+0x2a/0x40
[   19.692293] Code:  Bad RIP value.
[   19.692548] RIP: 0x55 RSP: ffff88006bb4f540
[   19.692858] CR2: 0000000000000055
[   19.693166] ---[ end trace 3a3493e01cf69b19 ]---
[   19.693501] Kernel panic - not syncing: Fatal exception
[   19.693977] Dumping ftrace buffer:
[   19.694272]    (ftrace buffer empty)
[   19.694538] Kernel Offset: disabled
[   19.694804] Rebooting in 86400 seconds..