executing program
syzkaller login: [   14.560980] BUG: unable to handle kernel NULL pointer dereference at 0000000000000055
[   14.561587] IP: 0x55
[   14.561744] PGD 3c1f6067 
[   14.561746] P4D 3c1f6067 
[   14.561923] PUD 0 
[   14.562112] 
[   14.562443] Oops: 0010 [#1] SMP KASAN
[   14.562699] Dumping ftrace buffer:
[   14.562929]    (ftrace buffer empty)
[   14.563180] Modules linked in:
[   14.563391] CPU: 0 PID: 1191 Comm: kworker/u8:1 Not tainted 4.13.0-rc5-next-20170817+ #5
[   14.563927] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
[   14.564468] Workqueue: kstrp strp_work
[   14.564729] task: ffff88003c0ce680 task.stack: ffff88003c0d0000
[   14.565129] RIP: 0010:0x55
[   14.565313] RSP: 0018:ffff88003c0d7540 EFLAGS: 00010246
[   14.565659] RAX: dffffc0000000000 RBX: ffff88003d087d60 RCX: 0000000000000000
[   14.566394] RDX: 1ffff10007a10fbd RSI: 0000000000000000 RDI: ffff88003d087c48
[   14.566794] RBP: ffff88003c0d7558 R08: ffffffff81464ab2 R09: 0000000000000000
[   14.567245] R10: ffff88003c0d7438 R11: ffff88003c0d7940 R12: ffff88003d087c48
[   14.567755] R13: ffff88003d731518 R14: ffff88003c0d7980 R15: ffff88003d731500
[   14.568243] FS:  0000000000000000(0000) GS:ffff88003ec00000(0000) knlGS:0000000000000000
[   14.568768] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   14.569151] CR2: 0000000000000055 CR3: 000000003da43000 CR4: 00000000000006f0
[   14.569613] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   14.570087] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   14.570700] Call Trace:
[   14.570924]  ? strp_work+0x41/0xf0
[   14.571228]  process_one_work+0xbf3/0x1bc0
[   14.571597]  ? pwq_dec_nr_in_flight+0x450/0x450
[   14.571991]  ? preempt_notifier_dec+0x20/0x20
[   14.572283]  ? sched_clock_cpu+0x1b/0x170
[   14.572553]  ? __schedule+0x8f0/0x2070
[   14.572808]  ? lock_acquire+0x1d5/0x580
[   14.573072]  ? lock_acquire+0x1d5/0x580
[   14.573329]  ? select_task_rq_fair+0xec9/0x3380
[   14.573629]  ? lock_downgrade+0x990/0x990
[   14.573953]  ? lock_release+0xa40/0xa40
[   14.574250]  ? lock_acquire+0x1d5/0x580
[   14.574506]  ? lock_acquire+0x1d5/0x580
[   14.574762]  ? worker_thread+0x4a3/0x1860
[   14.575066]  ? lock_downgrade+0x990/0x990
[   14.575394]  ? lock_release+0xa40/0xa40
[   14.575731]  ? do_raw_spin_trylock+0x190/0x190
[   14.576189]  ? set_next_entity+0x2ca/0xd60
[   14.576604]  worker_thread+0x223/0x1860
[   14.577041]  ? process_one_work+0x1bc0/0x1bc0
[   14.577432]  ? __schedule+0x8b7/0x2070
[   14.577825]  ? trace_hardirqs_on+0xd/0x10
[   14.578184]  ? _raw_spin_unlock_irq+0x27/0x70
[   14.578586]  ? finish_task_switch+0x1d3/0x740
[   14.579003]  ? finish_task_switch+0x1aa/0x740
[   14.579384]  ? lock_downgrade+0x990/0x990
[   14.579810]  ? lock_downgrade+0x990/0x990
[   14.580181]  ? preempt_notifier_dec+0x20/0x20
[   14.580589]  ? __schedule+0x8f0/0x2070
[   14.580951]  ? kthread_data+0x42/0xb0
[   14.581292]  ? try_to_wake_up+0xf9/0x1600
[   14.581650]  ? migrate_swap_stop+0x970/0x970
[   14.582045]  ? lock_acquire+0x1d5/0x580
[   14.582384]  ? fs_reclaim_acquire+0x20/0x20
[   14.582752]  ? lock_acquire+0x1d5/0x580
[   14.583088]  ? lock_acquire+0x1d5/0x580
[   14.583425]  ? complete+0x62/0x80
[   14.583733]  ? __schedule+0x2070/0x2070
[   14.584071]  ? __lockdep_init_map+0xe4/0x650
[   14.584444]  ? default_wake_function+0x30/0x50
[   14.584831]  ? __init_waitqueue_head+0x97/0x140
[   14.585224]  ? __wake_up_common+0xb4/0x150
[   14.585582]  ? trace_hardirqs_on+0xd/0x10
[   14.585935]  ? __kthread_parkme+0x173/0x240
[   14.586303]  kthread+0x35e/0x430
[   14.586588]  ? process_one_work+0x1bc0/0x1bc0
[   14.586967]  ? kthread_create_on_node+0x100/0x100
[   14.587685]  ret_from_fork+0x2a/0x40
[   14.588062] Code:  Bad RIP value.
[   14.588402] RIP: 0x55 RSP: ffff88003c0d7540
[   14.588778] CR2: 0000000000000055
[   14.589072] ---[ end trace 3259e3c5a6052379 ]---
[   14.589441] Kernel panic - not syncing: Fatal exception
[   14.589940] Dumping ftrace buffer:
[   14.590216]    (ftrace buffer empty)
[   14.590457] Kernel Offset: disabled
[   14.590783] Rebooting in 86400 seconds..