input: syz1 as /devices/virtual/input/input57
------------[ cut here ]------------
WARNING: CPU: 1 PID: 16197 at include/linux/kref.h:46 kref_get include/linux/kref.h:46 [inline]()
WARNING: CPU: 1 PID: 16197 at include/linux/kref.h:46 kobject_get+0xca/0xf0 lib/kobject.c:596()
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 16197 Comm: syz-executor2 Not tainted 4.4.162+ #7
 0000000000000000 1357e16fde39503e ffff8800b45af758 ffffffff81a994bd
 ffffffff828354e0 ffff8800b5ce97c0 ffffffff82920c20 0000000000000009
 000000000000002e ffff8800b45af818 ffffffff813a0e94 0000000041b58ab3
Call Trace:
 [<ffffffff81a994bd>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81a994bd>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff813a0e94>] panic+0x19e/0x359 kernel/panic.c:112
 [<ffffffff813a1084>] warn_slowpath_common.cold.6+0x20/0x20 kernel/panic.c:455
 [<ffffffff810d4169>] warn_slowpath_null+0x29/0x30 kernel/panic.c:492
 [<ffffffff81a9f02a>] kref_get include/linux/kref.h:46 [inline]
 [<ffffffff81a9f02a>] kobject_get+0xca/0xf0 lib/kobject.c:596
 [<ffffffff8149d901>] cdev_get+0x51/0xa0 fs/char_dev.c:329
 [<ffffffff8149e08d>] chrdev_open+0xad/0x5c0 fs/char_dev.c:374
 [<ffffffff8148ba0d>] do_dentry_open+0x38d/0xbd0 fs/open.c:749
 [<ffffffff8148f17a>] vfs_open+0x12a/0x210 fs/open.c:862
 [<ffffffff814bed5c>] do_last fs/namei.c:3222 [inline]
 [<ffffffff814bed5c>] path_openat+0x50c/0x39a0 fs/namei.c:3359
 [<ffffffff814c5e87>] do_filp_open+0x197/0x270 fs/namei.c:3393
 [<ffffffff8148fa9c>] do_sys_open+0x31c/0x610 fs/open.c:1038
 [<ffffffff81591dda>] C_SYSC_open fs/compat.c:1092 [inline]
 [<ffffffff81591dda>] compat_SyS_open+0x2a/0x40 fs/compat.c:1090
 [<ffffffff8100629e>] do_syscall_32_irqs_on arch/x86/entry/common.c:396 [inline]
 [<ffffffff8100629e>] do_fast_syscall_32+0x31e/0xa80 arch/x86/entry/common.c:463
 [<ffffffff82707a50>] sysenter_flags_fixed+0xd/0x1a
Kernel Offset: disabled
Rebooting in 86400 seconds..