WARNING: CPU: 1 PID: 19201 at lib/list_debug.c:36 __list_add+0x169/0x1c0 lib/list_debug.c:34 list_add double add: new=ffff8801c5e371e8, prev=ffff8801c5e371e8, next=ffffffff84876140. Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 19201 Comm: syz-executor2 Not tainted 4.9.39-ga1e4c795 #8 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801ab8af9f8 ffffffff81eacd59 ffffffff83a48d40 ffff8801ab8afad0 ffffffff83c3a600 ffffffff81f13829 0000000000000009 ffff8801ab8afac0 ffffffff814265a6 0000000041b58ab3 ffffffff84169b8d ffffffff814263f2 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] panic+0x1b4/0x3a0 kernel/panic.c:179 [] __warn+0x1c4/0x1e0 kernel/panic.c:542 [] warn_slowpath_fmt+0xae/0xe0 kernel/panic.c:565 [] __list_add+0x169/0x1c0 lib/list_debug.c:34 [] list_add_tail include/linux/list.h:77 [inline] [] input_register_handler+0xa0/0x150 drivers/input/input.c:2222 [] keychord_write+0x575/0x810 drivers/input/misc/keychord.c:317 [] __vfs_write+0xfb/0x660 fs/read_write.c:510 [] vfs_write+0x170/0x4e0 fs/read_write.c:560 [] SYSC_write fs/read_write.c:607 [inline] [] SyS_write+0xd4/0x1a0 fs/read_write.c:599 [] entry_SYSCALL_64_fastpath+0x23/0xc6 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..