attempt to access beyond end of device
loop3: rw=2049, want=66, limit=60
Buffer I/O error on dev loop3, logical block 32, lost async page write
Bluetooth: hci0: command 0x0c1a tx timeout
==================================================================
BUG: KASAN: use-after-free in __queue_work+0xdff/0x1100 kernel/workqueue.c:1383
Read of size 4 at addr ffff8880a3214bc0 by task kworker/0:2/3645

CPU: 0 PID: 3645 Comm: kworker/0:2 Not tainted 4.19.164-syzkaller #0
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+0x1fc/0x2fe lib/dump_stack.c:118
 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
 kasan_report_error.cold+0x8a/0x1c7 mm/kasan/report.c:354
 kasan_report mm/kasan/report.c:412 [inline]
 __asan_report_load4_noabort+0x88/0x90 mm/kasan/report.c:432
 __queue_work+0xdff/0x1100 kernel/workqueue.c:1383
 queue_work_on+0x17e/0x1f0 kernel/workqueue.c:1488
 process_one_work+0x864/0x1570 kernel/workqueue.c:2155
 worker_thread+0x64c/0x1130 kernel/workqueue.c:2298
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415

Allocated by task 9215:
 __do_kmalloc mm/slab.c:3727 [inline]
 __kmalloc+0x15a/0x3c0 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 kzalloc include/linux/slab.h:709 [inline]
 __alloc_workqueue_key+0x789/0xed0 kernel/workqueue.c:4087
 hci_register_dev+0x1ce/0x960 net/bluetooth/hci_core.c:3179
 __vhci_create_device+0x2b5/0x580 drivers/bluetooth/hci_vhci.c:139
 vhci_create_device drivers/bluetooth/hci_vhci.c:163 [inline]
 vhci_open_timeout+0x35/0x50 drivers/bluetooth/hci_vhci.c:319
 process_one_work+0x864/0x1570 kernel/workqueue.c:2155
 worker_thread+0x64c/0x1130 kernel/workqueue.c:2298
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415

Freed by task 25145:
 __cache_free mm/slab.c:3503 [inline]
 kfree+0xcc/0x210 mm/slab.c:3822
 __rcu_reclaim kernel/rcu/rcu.h:236 [inline]
 rcu_do_batch kernel/rcu/tree.c:2584 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2897 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2864 [inline]
 rcu_process_callbacks+0x8ff/0x18b0 kernel/rcu/tree.c:2881
 __do_softirq+0x26c/0x9a0 kernel/softirq.c:292

The buggy address belongs to the object at ffff8880a3214a40
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 384 bytes inside of
 512-byte region [ffff8880a3214a40, ffff8880a3214c40)
The buggy address belongs to the page:
page:ffffea00028c8500 count:1 mapcount:0 mapping:ffff88813bff0940 index:0xffff8880a32142c0
flags: 0xfff00000000100(slab)
raw: 00fff00000000100 ffffea000279d708 ffffea0002852b48 ffff88813bff0940
raw: ffff8880a32142c0 ffff8880a3214040 0000000100000005 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a3214a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880a3214b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880a3214b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff8880a3214c00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8880a3214c80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
==================================================================