input: syz1 as /devices/virtual/input/input725
------------[ cut here ]------------
refcount_t: increment on 0; use-after-free.
WARNING: CPU: 0 PID: 16632 at lib/refcount.c:153 refcount_inc_checked /lib/refcount.c:153 [inline]
WARNING: CPU: 0 PID: 16632 at lib/refcount.c:153 refcount_inc_checked+0x61/0x70 /lib/refcount.c:151
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 16632 Comm: syz-executor.5 Not tainted 4.19.59 #32
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack /lib/dump_stack.c:77 [inline]
 dump_stack+0x172/0x1f0 /lib/dump_stack.c:113
 panic+0x263/0x507 /kernel/panic.c:185
 __warn.cold+0x20/0x4a /kernel/panic.c:540
 report_bug+0x263/0x2b0 /lib/bug.c:186
 fixup_bug /arch/x86/kernel/traps.c:178 [inline]
 fixup_bug /arch/x86/kernel/traps.c:173 [inline]
 do_error_trap+0x204/0x360 /arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 /arch/x86/kernel/traps.c:316
 invalid_op+0x14/0x20 /arch/x86/entry/entry_64.S:1013
RIP: 0010:refcount_inc_checked /lib/refcount.c:153 [inline]
RIP: 0010:refcount_inc_checked+0x61/0x70 /lib/refcount.c:151
Code: 1d 8e e9 12 06 31 ff 89 de e8 bb 86 47 fe 84 db 75 dd e8 72 85 47 fe 48 c7 c7 80 96 81 87 c6 05 6e e9 12 06 01 e8 8d 5f 1b fe <0f> 0b eb c1 90 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 57 41
RSP: 0018:ffff88807c4778b8 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000010e30 RSI: ffffffff8155b0b6 RDI: ffffed100f88ef09
RBP: ffff88807c4778c8 R08: ffff888094cf0340 R09: ffff888094cf0be0
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88805626e7a8
R13: 0000000000000000 R14: ffff88807825ad00 R15: ffff8880952b39e8
 kref_get /./include/linux/kref.h:47 [inline]
 kobject_get+0x66/0xc0 /lib/kobject.c:613
 cdev_get+0x60/0xb0 /fs/char_dev.c:364
 chrdev_open+0xb0/0x6b0 /fs/char_dev.c:409
 do_dentry_open+0x4c3/0x1200 /fs/open.c:777
 vfs_open+0xa0/0xd0 /fs/open.c:886
 do_last /fs/namei.c:3418 [inline]
 path_openat+0x10d7/0x4690 /fs/namei.c:3534
 do_filp_open+0x1a1/0x280 /fs/namei.c:3564
 do_sys_open+0x3fe/0x550 /fs/open.c:1069
 __do_sys_open /fs/open.c:1087 [inline]
 __se_sys_open /fs/open.c:1082 [inline]
 __x64_sys_open+0x7e/0xc0 /fs/open.c:1082
 do_syscall_64+0xfd/0x620 /arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x413701
Code: 75 14 b8 02 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 19 00 00 c3 48 83 ec 08 e8 0a fa ff ff 48 89 04 24 b8 02 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fa ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007f27a4c807a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 0000000000413701
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007f27a4c80850
RBP: 000000000075c070 R08: 000000000000000f R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 00007f27a4c816d4
R13: 00000000004c8a3f R14: 00000000004df700 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..