------------[ cut here ]------------
refcount_t: increment on 0; use-after-free.
WARNING: CPU: 1 PID: 16307 at lib/refcount.c:156 refcount_inc_checked /lib/refcount.c:156 [inline]
WARNING: CPU: 1 PID: 16307 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: 16307 Comm: syz-executor.2 Not tainted 5.2.0+ #69
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 9f 8f 64 06 31 ff 89 de e8 9b e1 35 fe 84 db 75 dd e8 52 e0 35 fe 48 c7 c7 80 06 c6 87 c6 05 7f 8f 64 06 01 e8 b7 48 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:ffff8880876df8f8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000017fdf RSI: ffffffff815c3616 RDI: ffffed1010edbf11
RBP: ffff8880876df908 R08: ffff88805b00e240 R09: ffffed1015d260b1
R10: ffffed1015d260b0 R11: ffff8880ae930587 R12: ffff88821ae45df8
R13: ffff888089b06920 R14: ffff888089b06918 R15: ffff88821ae45d78
 kref_get /./include/linux/kref.h:45 [inline]
 kobject_get+0x66/0xc0 /lib/kobject.c:644
 kset_get /./include/linux/kobject.h:214 [inline]
 kobj_kset_join /lib/kobject.c:194 [inline]
 kobject_add_internal /lib/kobject.c:246 [inline]
 kobject_add_internal+0x14f/0x380 /lib/kobject.c:225
 kobject_add_varg /lib/kobject.c:390 [inline]
 kobject_add+0x150/0x1c0 /lib/kobject.c:442
 class_dir_create_and_add /drivers/base/core.c:1732 [inline]
 get_device_parent.isra.0+0x413/0x560 /drivers/base/core.c:1787
 device_add+0x2df/0x17a0 /drivers/base/core.c:2048
 hci_register_dev+0x2e8/0x8f0 /net/bluetooth/hci_core.c:3307
 __vhci_create_device+0x2c5/0x5d0 /drivers/bluetooth/hci_vhci.c:124
 vhci_create_device /drivers/bluetooth/hci_vhci.c:148 [inline]
 vhci_get_user /drivers/bluetooth/hci_vhci.c:204 [inline]
 vhci_write+0x2d0/0x470 /drivers/bluetooth/hci_vhci.c:284
 call_write_iter /./include/linux/fs.h:1870 [inline]
 new_sync_write+0x4d3/0x770 /fs/read_write.c:483
 __vfs_write+0xe1/0x110 /fs/read_write.c:496
 vfs_write+0x268/0x5d0 /fs/read_write.c:558
 ksys_write+0x14f/0x290 /fs/read_write.c:611
 __do_sys_write /fs/read_write.c:623 [inline]
 __se_sys_write /fs/read_write.c:620 [inline]
 __x64_sys_write+0x73/0xb0 /fs/read_write.c:620
 do_syscall_64+0xfd/0x6a0 /arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459819
Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fbd6fb06c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459819
RDX: 0000000000000002 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbd6fb076d4
R13: 00000000004c9985 R14: 00000000004e0e40 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..