hid-generic 0000:0000:0000.009C: unknown main item tag 0x0
hid-generic 0000:0000:0000.009C: unknown main item tag 0x0
hid-generic 0000:0000:0000.009C: unknown main item tag 0x0
refcount_t: underflow; use-after-free.
------------[ cut here ]------------
WARNING: CPU: 0 PID: 14761 at lib/refcount.c:187 refcount_sub_and_test lib/refcount.c:187 [inline]
WARNING: CPU: 0 PID: 14761 at lib/refcount.c:187 refcount_sub_and_test.cold+0x18/0x22 lib/refcount.c:177
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 14761 Comm: syz-executor.1 Not tainted 4.14.131 #25
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x138/0x19c lib/dump_stack.c:53
 panic+0x1f2/0x426 kernel/panic.c:182
 __warn.cold+0x2f/0x36 kernel/panic.c:546
 report_bug+0x216/0x254 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 fixup_bug arch/x86/kernel/traps.c:172 [inline]
 do_error_trap+0x1bb/0x310 arch/x86/kernel/traps.c:295
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:960
RIP: 0010:refcount_sub_and_test lib/refcount.c:187 [inline]
RIP: 0010:refcount_sub_and_test.cold+0x18/0x22 lib/refcount.c:177
RSP: 0018:ffff888053847b98 EFLAGS: 00010286
RAX: 0000000000000026 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff88805c87aec0 RDI: ffffed100a708f69
RBP: ffff888053847bc0 R08: 0000000000000026 R09: ffff88805c87aee0
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88821a9a4bf8
kobject: 'loop2' (ffff8880a49a77e0): kobject_uevent_env
R13: 0000000000000001 R14: 00000000ffffffff R15: ffff8880a6e6f688
kobject: 'loop4' (ffff8880a4a90120): kobject_uevent_env
 refcount_dec_and_test+0x1b/0x20 lib/refcount.c:212
 kref_put include/linux/kref.h:69 [inline]
 kobject_put+0x60/0x80 lib/kobject.c:692
 kset_put include/linux/kobject.h:215 [inline]
 kobj_kset_leave+0x17f/0x220 lib/kobject.c:184
 kobject_del.part.0+0x79/0xf0 lib/kobject.c:579
 kobject_del+0x20/0x30 lib/kobject.c:571
 cleanup_glue_dir.part.0+0xd2/0x100 drivers/base/core.c:1581
 cleanup_glue_dir drivers/base/core.c:614 [inline]
 device_del+0x78a/0xaa0 drivers/base/core.c:2024
kobject: 'loop4' (ffff8880a4a90120): fill_kobj_path: path = '/devices/virtual/block/loop4'
 hci_unregister_dev+0x298/0x7d0 net/bluetooth/hci_core.c:3212
 vhci_release+0x76/0xf0 drivers/bluetooth/hci_vhci.c:354
 __fput+0x275/0x7a0 fs/file_table.c:210
 ____fput+0x16/0x20 fs/file_table.c:244
 task_work_run+0x114/0x190 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x1da/0x220 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
kobject: 'loop2' (ffff8880a49a77e0): fill_kobj_path: path = '/devices/virtual/block/loop2'
RIP: 0033:0x413201
RSP: 002b:00007ffedecddba0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000413201
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 0000000000000001 R08: 000000006e783fbb R09: 000000006e783fbf
R10: 00007ffedecddc80 R11: 0000000000000293 R12: 000000000075c9a0
R13: 000000000075c9a0 R14: 000000000004036b R15: ffffffffffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..