BUG: spinlock bad magic on CPU#1, syzkaller663221/4925
 lock: 0xffff88003b6d30e8, .magic: ffff8800, .owner: syzkaller663221/4925, .owner_cpu: 1
CPU: 1 PID: 4925 Comm: syzkaller663221 Not tainted 4.13.0-next-20170907+ #17
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:16 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:52
 spin_dump+0x14d/0x280 kernel/locking/spinlock_debug.c:67
 spin_bug kernel/locking/spinlock_debug.c:75 [inline]
 debug_spin_unlock kernel/locking/spinlock_debug.c:97 [inline]
 do_raw_spin_unlock+0x2bd/0x330 kernel/locking/spinlock_debug.c:134
 __raw_spin_unlock include/linux/spinlock_api_smp.h:151 [inline]
 _raw_spin_unlock+0x22/0x30 kernel/locking/spinlock.c:183
 spin_unlock include/linux/spinlock.h:356 [inline]
 __fanout_link+0xaf/0xf0 net/packet/af_packet.c:1508
 fanout_add+0x88b/0x1190 net/packet/af_packet.c:1760
 packet_setsockopt+0xfdc/0x1e80 net/packet/af_packet.c:3795
 SYSC_setsockopt net/socket.c:1852 [inline]
 SyS_setsockopt+0x189/0x360 net/socket.c:1831
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x43b649
RSP: 002b:00007fafe524adb8 EFLAGS: 00000206 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043b649
RDX: 0000000000000012 RSI: 0000000000000107 RDI: 0000000000000035
RBP: 0000000000000082 R08: 0000000000000004 R09: 0000000000000000
R10: 00000000201ef000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fafe524b9c0 R15: 00007fafe524b700