Debian GNU/Linux 7 syzkaller ttyS0

executing program
syzkaller login: [   19.527212] BUG: unable to handle kernel NULL pointer dereference at 0000000000000055
[   19.527848] IP: 0x55
[   19.528015] PGD 3da35067 
[   19.528018] P4D 3da35067 
[   19.528207] PUD 3d914067 
[   19.528389] PMD 0 
[   19.528627] 
[   19.528877] Oops: 0010 [#1] SMP KASAN
[   19.529135] Dumping ftrace buffer:
[   19.529365]    (ftrace buffer empty)
[   19.529608] Modules linked in:
[   19.529837] CPU: 0 PID: 1192 Comm: kworker/u8:1 Not tainted 4.13.0-rc5-next-20170817+ #5
[   19.530377] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
[   19.530979] Workqueue: kstrp strp_work
[   19.531244] task: ffff88003c1867c0 task.stack: ffff88003c188000
[   19.531639] RIP: 0010:0x55
[   19.531878] RSP: 0018:ffff88003c18f540 EFLAGS: 00010246
[   19.532267] RAX: dffffc0000000000 RBX: ffff88006aa3cd60 RCX: 0000000000000000
[   19.532741] RDX: 1ffff1000d5479bd RSI: 0000000000000000 RDI: ffff88006aa3cc48
[   19.533222] RBP: ffff88003c18f558 R08: ffffffff81464ab2 R09: 0000000000000000
[   19.533696] R10: ffff88003c18f438 R11: ffff88003c18f940 R12: ffff88006aa3cc48
[   19.534198] R13: ffff88003c096e18 R14: ffff88003c18f980 R15: ffff88003c096e00
[   19.534676] FS:  0000000000000000(0000) GS:ffff88003ec00000(0000) knlGS:0000000000000000
[   19.535219] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   19.535603] CR2: 0000000000000055 CR3: 000000003e98e000 CR4: 00000000000006f0
[   19.536089] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   19.536562] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   19.537327] Call Trace:
[   19.537501]  ? strp_work+0x41/0xf0
[   19.537737]  process_one_work+0xbf3/0x1bc0
[   19.538032]  ? pwq_dec_nr_in_flight+0x450/0x450
[   19.538340]  ? preempt_notifier_dec+0x20/0x20
[   19.538634]  ? sched_clock_cpu+0x1b/0x170
[   19.538910]  ? __schedule+0x8f0/0x2070
[   19.539173]  ? lock_acquire+0x1d5/0x580
[   19.539449]  ? lock_acquire+0x1d5/0x580
[   19.539710]  ? select_task_rq_fair+0xec9/0x3380
[   19.540015]  ? lock_downgrade+0x990/0x990
[   19.540285]  ? lock_release+0xa40/0xa40
[   19.540551]  ? lock_acquire+0x1d5/0x580
[   19.540811]  ? lock_acquire+0x1d5/0x580
[   19.541072]  ? worker_thread+0x4a3/0x1860
[   19.541345]  ? lock_downgrade+0x990/0x990
[   19.541619]  ? lock_release+0xa40/0xa40
[   19.541884]  ? do_raw_spin_trylock+0x190/0x190
[   19.542187]  ? set_next_entity+0x2ca/0xd60
[   19.542469]  worker_thread+0x223/0x1860
[   19.542737]  ? process_one_work+0x1bc0/0x1bc0
[   19.543034]  ? __schedule+0x8b7/0x2070
[   19.543290]  ? trace_hardirqs_on+0xd/0x10
[   19.543563]  ? _raw_spin_unlock_irq+0x27/0x70
[   19.543858]  ? finish_task_switch+0x1d3/0x740
[   19.544154]  ? finish_task_switch+0x1aa/0x740
[   19.544450]  ? lock_downgrade+0x990/0x990
[   19.544723]  ? lock_downgrade+0x990/0x990
[   19.544996]  ? preempt_notifier_dec+0x20/0x20
[   19.545296]  ? __schedule+0x8f0/0x2070
[   19.545553]  ? kthread_data+0x42/0xb0
[   19.545807]  ? try_to_wake_up+0xf9/0x1600
[   19.546085]  ? migrate_swap_stop+0x970/0x970
[   19.546378]  ? lock_acquire+0x1d5/0x580
[   19.546645]  ? fs_reclaim_acquire+0x20/0x20
[   19.546935]  ? lock_acquire+0x1d5/0x580
[   19.547197]  ? lock_acquire+0x1d5/0x580
[   19.547457]  ? complete+0x62/0x80
[   19.547670]  ? __schedule+0x2070/0x2070
[   19.547930]  ? __lockdep_init_map+0xe4/0x650
[   19.548220]  ? default_wake_function+0x30/0x50
[   19.548522]  ? __init_waitqueue_head+0x97/0x140
[   19.548855]  ? __wake_up_common+0xb4/0x150
[   19.549134]  ? trace_hardirqs_on+0xd/0x10
[   19.549433]  ? __kthread_parkme+0x173/0x240
[   19.549761]  kthread+0x35e/0x430
[   19.550037]  ? process_one_work+0x1bc0/0x1bc0
[   19.550389]  ? kthread_create_on_node+0x100/0x100
[   19.550699]  ret_from_fork+0x2a/0x40
[   19.551006] Code:  Bad RIP value.
[   19.551249] RIP: 0x55 RSP: ffff88003c18f540
[   19.551525] CR2: 0000000000000055
[   19.551813] ---[ end trace 8976a308fdb53eff ]---
[   19.552125] Kernel panic - not syncing: Fatal exception
[   19.552610] Dumping ftrace buffer:
[   19.552847]    (ftrace buffer empty)
[   19.553117] Kernel Offset: disabled
[   19.553400] Rebooting in 86400 seconds..