netlink: 5 bytes leftover after parsing attributes in process `syz-executor1'.
netlink: 9 bytes leftover after parsing attributes in process `syz-executor5'.
------------[ cut here ]------------
WARNING: CPU: 1 PID: 11443 at lib/list_debug.c:36 __list_add+0x169/0x1c0 lib/list_debug.c:34
list_add double add: new=ffff8801c7b30de8, prev=ffff8801c7b30de8, next=ffffffff84832ea0.
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 11443 Comm: syz-executor0 Not tainted 4.9.40-ged32335 #11
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801cf8479d8 ffffffff81d8d829 ffffffff83a46b40 ffff8801cf847ab0
 ffffffff83c16c00 ffffffff81df4c99 0000000000000009 ffff8801cf847aa0
 ffffffff81429671 0000000041b58ab3 ffffffff841835f0 ffffffff814294b5
Call Trace:
 [<ffffffff81d8d829>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d8d829>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81429671>] panic+0x1bc/0x3a8 kernel/panic.c:179
 [<ffffffff81131e54>] __warn+0x1c4/0x1e0 kernel/panic.c:542
 [<ffffffff81131f34>] warn_slowpath_fmt+0xc4/0x110 kernel/panic.c:565
 [<ffffffff81df4c99>] __list_add+0x169/0x1c0 lib/list_debug.c:34
 [<ffffffff82a307c0>] list_add_tail include/linux/list.h:77 [inline]
 [<ffffffff82a307c0>] input_register_handler+0xa0/0x150 drivers/input/input.c:2222
 [<ffffffff82a6ea92>] keychord_write+0x582/0x820 drivers/input/misc/keychord.c:317
 [<ffffffff815659a3>] __vfs_write+0x103/0x680 fs/read_write.c:510
 [<ffffffff81569ad0>] vfs_write+0x170/0x4e0 fs/read_write.c:560
 [<ffffffff8156d4c9>] SYSC_write fs/read_write.c:607 [inline]
 [<ffffffff8156d4c9>] SyS_write+0xd9/0x1b0 fs/read_write.c:599
 [<ffffffff838a06c5>] entry_SYSCALL_64_fastpath+0x23/0xc6
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..