executing program
syzkaller login: [   22.000807] BUG: unable to handle kernel NULL pointer dereference at 0000000000000055
[   22.001350] IP: 0x55
[   22.001499] PGD 0 
[   22.001500] P4D 0 
[   22.001621] 
[   22.001832] Oops: 0010 [#1] SMP KASAN
[   22.002054] Dumping ftrace buffer:
[   22.002250]    (ftrace buffer empty)
[   22.002466] Modules linked in:
[   22.002645] CPU: 1 PID: 1193 Comm: kworker/u8:1 Not tainted 4.13.0-rc5-next-20170817+ #5
[   22.003109] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
[   22.003582] Workqueue: kstrp strp_work
[   22.003800] task: ffff88003c54a540 task.stack: ffff88003c550000
[   22.004146] RIP: 0010:0x55
[   22.004393] RSP: 0018:ffff88003c557540 EFLAGS: 00010246
[   22.004860] RAX: dffffc0000000000 RBX: ffff88006c8c0d60 RCX: 0000000000000000
[   22.005539] RDX: 1ffff1000d9181bd RSI: 0000000000000000 RDI: ffff88006c8c0c48
[   22.006166] RBP: ffff88003c557558 R08: ffffffff81464ab2 R09: 0000000000000000
[   22.006771] R10: ffff88003c557438 R11: ffff88003c557940 R12: ffff88006c8c0c48
[   22.007265] R13: ffff88003cd74618 R14: ffff88003c557980 R15: ffff88003cd74600
[   22.007886] FS:  0000000000000000(0000) GS:ffff88003ed00000(0000) knlGS:0000000000000000
[   22.008601] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   22.009099] CR2: 0000000000000055 CR3: 000000006d1d2000 CR4: 00000000000006e0
[   22.009729] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   22.010356] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   22.011124] Call Trace:
[   22.011356]  ? strp_work+0x41/0xf0
[   22.011668]  process_one_work+0xbf3/0x1bc0
[   22.012011]  ? pwq_dec_nr_in_flight+0x450/0x450
[   22.012407]  ? preempt_notifier_dec+0x20/0x20
[   22.013080]  ? sched_clock_cpu+0x1b/0x170
[   22.013453]  ? __schedule+0x8f0/0x2070
[   22.013798]  ? lock_acquire+0x1d5/0x580
[   22.014201]  ? lock_acquire+0x1d5/0x580
[   22.014561]  ? select_task_rq_fair+0xec9/0x3380
[   22.014987]  ? lock_downgrade+0x990/0x990
[   22.015386]  ? lock_release+0xa40/0xa40
[   22.015747]  ? lock_acquire+0x1d5/0x580
[   22.016136]  ? lock_acquire+0x1d5/0x580
[   22.016500]  ? worker_thread+0x4a3/0x1860
[   22.016877]  ? lock_downgrade+0x990/0x990
[   22.017303]  ? lock_release+0xa40/0xa40
[   22.017664]  ? do_raw_spin_trylock+0x190/0x190
[   22.018102]  ? lock_acquire+0x1d5/0x580
[   22.018457]  ? pick_next_task_fair+0x3f8/0x1610
[   22.018869]  ? lock_downgrade+0x990/0x990
[   22.019272]  worker_thread+0x223/0x1860
[   22.019631]  ? process_one_work+0x1bc0/0x1bc0
[   22.020050]  ? pvclock_read_flags+0x160/0x160
[   22.020480]  ? __schedule+0x8b7/0x2070
[   22.020829]  ? trace_hardirqs_on+0xd/0x10
[   22.021265]  ? _raw_spin_unlock_irq+0x27/0x70
[   22.021668]  ? finish_task_switch+0x1d3/0x740
[   22.022096]  ? finish_task_switch+0x1aa/0x740
[   22.022534]  ? preempt_notifier_dec+0x20/0x20
[   22.022930]  ? sched_clock_cpu+0x104/0x170
[   22.023340]  ? __schedule+0x8f0/0x2070
[   22.023691]  ? try_to_wake_up+0xf9/0x1600
[   22.024069]  ? migrate_swap_stop+0x970/0x970
[   22.024476]  ? lock_acquire+0x1d5/0x580
[   22.024832]  ? fs_reclaim_acquire+0x20/0x20
[   22.025244]  ? lock_acquire+0x1d5/0x580
[   22.025595]  ? lock_acquire+0x1d5/0x580
[   22.025940]  ? complete+0x62/0x80
[   22.026280]  ? __schedule+0x2070/0x2070
[   22.026620]  ? __lockdep_init_map+0xe4/0x650
[   22.026997]  ? default_wake_function+0x30/0x50
[   22.027427]  ? __init_waitqueue_head+0x97/0x140
[   22.027834]  ? __wake_up_common+0xb4/0x150
[   22.028213]  ? trace_hardirqs_on+0xd/0x10
[   22.028719]  ? __kthread_parkme+0x173/0x240
[   22.029107]  kthread+0x35e/0x430
[   22.029434]  ? process_one_work+0x1bc0/0x1bc0
[   22.029755]  ? kthread_create_on_node+0x100/0x100
[   22.030149]  ret_from_fork+0x2a/0x40
[   22.030491] Code:  Bad RIP value.
[   22.030786] RIP: 0x55 RSP: ffff88003c557540
[   22.031168] CR2: 0000000000000055
[   22.031489] ---[ end trace d80686b921e2605b ]---
[   22.031886] Kernel panic - not syncing: Fatal exception
[   22.032401] Dumping ftrace buffer:
[   22.032702]    (ftrace buffer empty)
[   22.033007] Kernel Offset: disabled
[   22.033503] Rebooting in 86400 seconds..