input: syz1 as /devices/virtual/input/input488
------------[ cut here ]------------
refcount_t: increment on 0; use-after-free.
WARNING: CPU: 1 PID: 8871 at lib/refcount.c:156 refcount_inc_checked lib/refcount.c:156 [inline]
WARNING: CPU: 1 PID: 8871 at lib/refcount.c:156 refcount_inc_checked+0x61/0x70 lib/refcount.c:154
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 8871 Comm: syz-executor349 Not tainted 5.1.0-rc7+ #100
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+0x2cb/0x65c kernel/panic.c:214
 __warn.cold+0x20/0x45 kernel/panic.c:571
 report_bug+0x263/0x2b0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:179 [inline]
 fixup_bug arch/x86/kernel/traps.c:174 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272
 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:291
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973
RIP: 0010:refcount_inc_checked lib/refcount.c:156 [inline]
RIP: 0010:refcount_inc_checked+0x61/0x70 lib/refcount.c:154
Code: 1d 86 2e 2a 06 31 ff 89 de e8 8b 30 40 fe 84 db 75 dd e8 42 2f 40 fe 48 c7 c7 20 7a a1 87 c6 05 66 2e 2a 06 01 e8 2d dd 12 fe <0f> 0b eb c1 90 90 90 90 90 90 90 90 90 90 90 55 48 89 e5 41 57 41
RSP: 0018:ffff888088fd78b8 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815afcb6 RDI: ffffed10111faf09
RBP: ffff888088fd78c8 R08: ffff88809f8ce240 R09: ffffed1015d23ef1
R10: ffffed1015d23ef0 R11: ffff8880ae91f787 R12: ffff888096a08878
R13: 0000000000000000 R14: ffff88809f6ad2c0 R15: ffff88808ec0cf10
 kref_get include/linux/kref.h:47 [inline]
 kobject_get+0x66/0xc0 lib/kobject.c:613
 cdev_get+0x60/0xb0 fs/char_dev.c:358
 chrdev_open+0xb0/0x6b0 fs/char_dev.c:403
 do_dentry_open+0x4e2/0x1250 fs/open.c:777
 vfs_open+0xa0/0xd0 fs/open.c:886
 do_last fs/namei.c:3416 [inline]
 path_openat+0x10e9/0x46e0 fs/namei.c:3533
 do_filp_open+0x1a1/0x280 fs/namei.c:3563
 do_sys_open+0x3fe/0x5d0 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+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4025c0
Code: 48 83 c4 08 48 3d 01 f0 ff ff 0f 83 ba 0b 00 00 c3 66 0f 1f 84 00 00 00 00 00 83 3d cd 39 3f 00 00 75 14 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 94 0b 00 00 c3 48 83 ec 08 e8 fa 00 00 00
RSP: 002b:00000000007ef8e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004025c0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000007ef8f0
RBP: 000000000000000a R08: 000000000000000f R09: 00000000007eff8f
R10: 00000000007eff8f R11: 0000000000000246 R12: 000000000000004e
R13: 0000000000403670 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..