input: syz1 as /devices/virtual/input/input211
------------[ cut here ]------------
refcount_t: increment on 0; use-after-free.
WARNING: CPU: 0 PID: 1538 at lib/refcount.c:156 refcount_inc_checked /lib/refcount.c:156 [inline]
WARNING: CPU: 0 PID: 1538 at lib/refcount.c:156 refcount_inc_checked+0x61/0x70 /lib/refcount.c:154
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 1538 Comm: syz-executor.5 Not tainted 5.2.0+ #90
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+0x2dc/0x755 /kernel/panic.c:219
 __warn.cold+0x20/0x4c /kernel/panic.c:576
 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:1008
RIP: 0010:refcount_inc_checked /lib/refcount.c:156 [inline]
RIP: 0010:refcount_inc_checked+0x61/0x70 /lib/refcount.c:154
Code: 1d 7f 6e 64 06 31 ff 89 de e8 cb d2 35 fe 84 db 75 dd e8 82 d1 35 fe 48 c7 c7 40 09 c6 87 c6 05 5f 6e 64 06 01 e8 77 39 07 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:ffff8880a459f8b8 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 000000000001be38 RSI: ffffffff815c3a26 RDI: ffffed10148b3f09
RBP: ffff8880a459f8c8 R08: ffff8880913da500 R09: fffffbfff14a774c
R10: fffffbfff14a774b R11: ffffffff8a53ba5f R12: ffff888087d2fac0
R13: 0000000000000000 R14: ffff8880a4d31d00 R15: ffff888089e91f10
 kref_get /./include/linux/kref.h:45 [inline]
 kobject_get+0x66/0xc0 /lib/kobject.c:644
 cdev_get+0x60/0xb0 /fs/char_dev.c:355
 chrdev_open+0xb0/0x6b0 /fs/char_dev.c:400
 do_dentry_open+0x4df/0x1250 /fs/open.c:778
 vfs_open+0xa0/0xd0 /fs/open.c:887
 do_last /fs/namei.c:3416 [inline]
 path_openat+0x10e9/0x4630 /fs/namei.c:3533
 do_filp_open+0x1a1/0x280 /fs/namei.c:3563
 do_sys_open+0x3fe/0x5d0 /fs/open.c:1070
 __do_sys_open /fs/open.c:1088 [inline]
 __se_sys_open /fs/open.c:1083 [inline]
 __x64_sys_open+0x7e/0xc0 /fs/open.c:1083
 do_syscall_64+0xfd/0x6a0 /arch/x86/entry/common.c:296
 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:00007fb473a917a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 0000000000413701
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007fb473a91850
RBP: 000000000075bf20 R08: 000000000000000f R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 00007fb473a926d4
R13: 00000000004c8a3f R14: 00000000004df700 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..