Bluetooth: hci1: Entering manufacturer mode failed (-110)
Bluetooth: hci1: command 0xfc11 tx timeout
Bluetooth: hci3: Entering manufacturer mode failed (-110)
Bluetooth: hci4: Entering manufacturer mode failed (-110)
==================================================================
BUG: KASAN: use-after-free in hci_cmd_timeout+0x1b4/0x1d0 net/bluetooth/hci_core.c:2574
Read of size 2 at addr ffff880090873a08 by task kworker/0:0/5

CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 4.20.0-rc1+ #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events hci_cmd_timeout
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x16b/0x224 lib/dump_stack.c:113
 print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.8+0x242/0x309 mm/kasan/report.c:412
 __asan_report_load_n_noabort+0xf/0x20 mm/kasan/report.c:443
 hci_cmd_timeout+0x1b4/0x1d0 net/bluetooth/hci_core.c:2574
 process_one_work+0x830/0x1670 kernel/workqueue.c:2153
 worker_thread+0x85/0xb60 kernel/workqueue.c:2296
 kthread+0x324/0x3e0 kernel/kthread.c:246
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Allocated by task 7220:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553
 __do_kmalloc_node mm/slab.c:3684 [inline]
 __kmalloc_node_track_caller+0x50/0x70 mm/slab.c:3698
 __kmalloc_reserve.isra.40+0x2c/0xc0 net/core/skbuff.c:137
 __alloc_skb+0xd7/0x580 net/core/skbuff.c:205
kobject: 'rfkill127' (00000000bf9eedec): kobject_cleanup, parent           (null)
 alloc_skb include/linux/skbuff.h:997 [inline]
 bt_skb_alloc include/net/bluetooth/bluetooth.h:339 [inline]
 hci_prepare_cmd+0x2c/0x200 net/bluetooth/hci_request.c:287
 hci_req_add_ev+0x7f/0x1f0 net/bluetooth/hci_request.c:321
 __hci_cmd_sync_ev+0xf8/0x1a0 net/bluetooth/hci_request.c:133
 __hci_cmd_sync+0x12/0x20 net/bluetooth/hci_request.c:182
 btintel_enter_mfg+0x29/0x70 drivers/bluetooth/btintel.c:82
 ag6xx_setup+0x112/0x7c0 drivers/bluetooth/hci_ag6xx.c:180
 hci_uart_setup+0x19c/0x3a0 drivers/bluetooth/hci_ldisc.c:418
 hci_dev_do_open+0x5a6/0x1360 net/bluetooth/hci_core.c:1423
 hci_power_on+0xe2/0x410 net/bluetooth/hci_core.c:2130
 process_one_work+0x830/0x1670 kernel/workqueue.c:2153
 worker_thread+0x85/0xb60 kernel/workqueue.c:2296
 kthread+0x324/0x3e0 kernel/kthread.c:246
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Freed by task 7220:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
 __cache_free mm/slab.c:3498 [inline]
 kfree+0xcf/0x220 mm/slab.c:3817
 skb_free_head+0x74/0x90 net/core/skbuff.c:550
 skb_release_data+0x43c/0x5b0 net/core/skbuff.c:570
 skb_release_all+0x3d/0x50 net/core/skbuff.c:627
 __kfree_skb net/core/skbuff.c:641 [inline]
 kfree_skb+0x97/0x270 net/core/skbuff.c:659
 hci_dev_do_open+0x46c/0x1360 net/bluetooth/hci_core.c:1509
 hci_power_on+0xe2/0x410 net/bluetooth/hci_core.c:2130
 process_one_work+0x830/0x1670 kernel/workqueue.c:2153
 worker_thread+0x85/0xb60 kernel/workqueue.c:2296
 kthread+0x324/0x3e0 kernel/kthread.c:246
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

The buggy address belongs to the object at ffff880090873a00
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 8 bytes inside of
 512-byte region [ffff880090873a00, ffff880090873c00)
The buggy address belongs to the page:
page:ffffea0002421cc0 count:1 mapcount:0 mapping:ffff88012c364940 index:0x0
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea0002554848 ffffea00023d4a48 ffff88012c364940
raw: 0000000000000000 ffff880090873000 0000000100000006 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff880090873900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff880090873980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff880090873a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                      ^
 ffff880090873a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff880090873b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================