input: syz1 as /devices/virtual/input/input6821
input: syz1 as /devices/virtual/input/input6822
input: syz1 as /devices/virtual/input/input6823
input: syz1 as /devices/virtual/input/input6826
------------[ cut here ]------------
WARNING: CPU: 0 PID: 28927 at ./include/linux/kref.h:46 kref_get include/linux/kref.h:46 [inline]
WARNING: CPU: 0 PID: 28927 at ./include/linux/kref.h:46 kobject_get+0xd1/0xf0 lib/kobject.c:596
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 28927 Comm: syz-executor4 Not tainted 4.9.135+ #110
 ffff8801c26cf7e0 ffffffff81b36bf9 ffffffff82a38ba0 00000000ffffffff
 0000000000000000 0000000000000000 000000000000002e ffff8801c26cf8a0
 ffffffff813f6aa5 0000000041b58ab3 ffffffff82e29bcb ffffffff813f68e6
Call Trace:
 [<ffffffff81b36bf9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b36bf9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff813f6aa5>] panic+0x1bf/0x39f kernel/panic.c:179
 [<ffffffff813f6d74>] __warn.cold.9+0xc1/0x17f kernel/panic.c:542
 [<ffffffff810dbe2c>] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585
 [<ffffffff81b3d051>] kref_get include/linux/kref.h:46 [inline]
 [<ffffffff81b3d051>] kobject_get+0xd1/0xf0 lib/kobject.c:596
 [<ffffffff815172c1>] cdev_get+0x51/0xa0 fs/char_dev.c:333
 [<ffffffff81517a4d>] chrdev_open+0xad/0x5c0 fs/char_dev.c:378
 [<ffffffff81501e2f>] do_dentry_open+0x3ef/0xc90 fs/open.c:766
 [<ffffffff8150575c>] vfs_open+0x11c/0x210 fs/open.c:879
 [<ffffffff8153c532>] do_last fs/namei.c:3410 [inline]
 [<ffffffff8153c532>] path_openat+0x542/0x2790 fs/namei.c:3534
 [<ffffffff81541607>] do_filp_open+0x197/0x270 fs/namei.c:3568
 [<ffffffff8150616d>] do_sys_open+0x30d/0x5c0 fs/open.c:1072
 [<ffffffff8150644d>] SYSC_open fs/open.c:1090 [inline]
 [<ffffffff8150644d>] SyS_open+0x2d/0x40 fs/open.c:1085
 [<ffffffff810056ef>] do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285
 [<ffffffff82803413>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Kernel Offset: disabled
Rebooting in 86400 seconds..