executing program
syzkaller login: [   21.162293] BUG: unable to handle kernel NULL pointer dereference at 0000000000000286
[   21.162869] IP: 0x286
[   21.163028] PGD 3abde067 
[   21.163032] P4D 3abde067 
[   21.163188] PUD 3be90067 
[   21.163468] PMD 0 
[   21.163705] 
[   21.164050] Oops: 0010 [#1] SMP KASAN
[   21.164400] Dumping ftrace buffer:
[   21.164713]    (ftrace buffer empty)
[   21.165094] Modules linked in:
[   21.165397] CPU: 0 PID: 5 Comm: kworker/u8:0 Not tainted 4.13.0-rc6-next-20170825+ #9
[   21.166188] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
[   21.166935] Workqueue: kstrp strp_work
[   21.167287] task: ffff88003ebd6140 task.stack: ffff88003ebd8000
[   21.167867] RIP: 0010:0x286
[   21.168132] RSP: 0018:ffff88003ebdf520 EFLAGS: 00010246
[   21.168607] RAX: dffffc0000000000 RBX: ffff88003a981b78 RCX: 0000000000000000
[   21.169275] RDX: 1ffff10007530381 RSI: ffffffff85b37b20 RDI: ffff88003a981a48
[   21.169946] RBP: ffff88003ebdf538 R08: ffff88003ebdee98 R09: ffff88003ebdeea8
[   21.170629] R10: ffff88003ebdee20 R11: 1ffff10007d7aebb R12: ffff88003a981a48
[   21.171472] R13: ffff88003eb76818 R14: ffff88003ebdf980 R15: ffff88003eb76800
[   21.172340] FS:  0000000000000000(0000) GS:ffff88003ec00000(0000) knlGS:0000000000000000
[   21.173268] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   21.175020] CR2: 0000000000000286 CR3: 000000003bb0e000 CR4: 00000000000006f0
[   21.175872] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   21.176729] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   21.177507] Call Trace:
[   21.177787]  ? strp_work+0x41/0xf0
[   21.178242]  process_one_work+0xbfd/0x1be0
[   21.178692]  ? check_noncircular+0x20/0x20
[   21.179180]  ? pwq_dec_nr_in_flight+0x450/0x450
[   21.179693]  ? finish_task_switch+0x1d3/0x740
[   21.180177]  ? finish_task_switch+0x1aa/0x740
[   21.180667]  ? __sched_text_start+0x8/0x8
[   21.181111]  ? lock_downgrade+0x990/0x990
[   21.181578]  ? find_held_lock+0x39/0x1d0
[   21.182047]  ? __mutex_unlock_slowpath+0xe9/0xac0
[   21.182543]  ? lock_acquire+0x1d5/0x580
[   21.182974]  ? worker_thread+0x4a3/0x1860
[   21.183458]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   21.184014]  ? lock_release+0xd70/0xd70
[   21.184508]  ? do_raw_spin_trylock+0x190/0x190
[   21.185018]  ? try_to_del_timer_sync+0x30/0x120
[   21.185524]  ? mark_held_locks+0xb2/0x100
[   21.185995]  worker_thread+0x223/0x1860
[   21.186551]  ? process_one_work+0x1be0/0x1be0
[   21.187137]  ? check_noncircular+0x20/0x20
[   21.187646]  ? _raw_spin_unlock_irq+0x27/0x70
[   21.188179]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   21.188714]  ? trace_hardirqs_on+0xd/0x10
[   21.189206]  ? finish_task_switch+0x1d3/0x740
[   21.189844]  ? finish_task_switch+0x1aa/0x740
[   21.190346]  ? preempt_notifier_dec+0x20/0x20
[   21.190833]  ? __schedule+0x8f0/0x2070
[   21.191312]  ? try_to_wake_up+0xf9/0x1600
[   21.191790]  ? find_held_lock+0x39/0x1d0
[   21.192228]  ? lock_downgrade+0x990/0x990
[   21.192711]  ? complete+0x18/0x80
[   21.193102]  ? __schedule+0x2070/0x2070
[   21.193562]  ? _raw_spin_unlock_irqrestore+0x31/0xba
[   21.194145]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   21.194716]  ? trace_hardirqs_on+0xd/0x10
[   21.195747]  ? __kthread_parkme+0x173/0x240
[   21.196314]  kthread+0x39c/0x470
[   21.196670]  ? process_one_work+0x1be0/0x1be0
[   21.197244]  ? kthread_create_on_node+0x100/0x100
[   21.197763]  ret_from_fork+0x2a/0x40
[   21.198192] Code:  Bad RIP value.
[   21.198574] RIP: 0x286 RSP: ffff88003ebdf520
[   21.199119] CR2: 0000000000000286
[   21.199504] ---[ end trace 1fdef0ab783c85ab ]---
[   21.200002] Kernel panic - not syncing: Fatal exception
[   21.200661] Dumping ftrace buffer:
[   21.201058]    (ftrace buffer empty)
[   21.201495] Kernel Offset: disabled
[   21.201913] Rebooting in 86400 seconds..