R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3a292b46d4
R13: 00000000004f1732 R14: 00000000004cd5b8 R15: 0000000000000004
IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 0 PID: 7581 at lib/refcount.c:187 refcount_sub_and_test_checked+0x2c9/0x310 lib/refcount.c:187
kobject: 'hci0': free name
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 7581 Comm: syz-executor3 Not tainted 4.20.0-rc7+ #380
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+0x244/0x39d lib/dump_stack.c:113
 panic+0x2ad/0x55c kernel/panic.c:188
 __warn.cold.8+0x20/0x45 kernel/panic.c:540
 report_bug+0x254/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973
RIP: 0010:refcount_sub_and_test_checked+0x2c9/0x310 lib/refcount.c:187
Code: 89 de e8 0a 7f ed fd 84 db 74 07 31 db e9 4d ff ff ff e8 2a 7e ed fd 48 c7 c7 80 b6 60 88 c6 05 96 c3 80 06 01 e8 27 de b6 fd <0f> 0b 31 db e9 2c ff ff ff 48 89 cf e8 06 e5 30 fe e9 41 fe ff ff
RSP: 0018:ffff88817d8af9c8 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc9000ad41000
RDX: 0000000000040000 RSI: ffffffff8165e495 RDI: 0000000000000005
RBP: ffff88817d8afab0 R08: ffff8881856086c0 R09: ffffed103b5c3ef8
R10: ffffed103b5c3ef8 R11: ffff8881dae1f7c7 R12: ffff88818072d748
R13: 00000000ffffffff R14: ffff88817d8afa88 R15: 0000000000000000
 refcount_dec_and_test_checked+0x1a/0x20 lib/refcount.c:212
 kref_put include/linux/kref.h:69 [inline]
 kobject_put+0x6c/0xe0 lib/kobject.c:708
 put_device+0x20/0x30 drivers/base/core.c:2024
 hci_dev_put include/net/bluetooth/hci_core.h:1014 [inline]
 hci_sock_release+0x165/0x3b0 net/bluetooth/hci_sock.c:874
 __sock_release+0xd7/0x250 net/socket.c:579
 sock_close+0x19/0x20 net/socket.c:1141
 __fput+0x385/0xa30 fs/file_table.c:278
 ____fput+0x15/0x20 fs/file_table.c:309
 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
 do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457669
Code: fd b3 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 b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f3a292b3c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 00007f3a292b3c90 RCX: 0000000000457669
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3a292b46d4
R13: 00000000004f1732 R14: 00000000004cd5b8 R15: 0000000000000004
Kernel Offset: disabled
Rebooting in 86400 seconds..