Hi,
when I remove the usb bluetooth adapter , the kernel reporting bug:
/* this two line is printk message I printed in net/bluetooth/hci_core.c */
#before free dev: c3758430
#after free dev
=============================================================================
BUG kmalloc-1024: Poison overwritten
-----------------------------------------------------------------------------
INFO: 0xc3758440-0xc3758440. First byte 0x6a instead of 0x6b
INFO: Allocated in hci_alloc_dev+0x1f/0x80 [bluetooth] age=6094 cpu=0 pid=9586
INFO: Freed in device_release+0x82/0x90 age=0 cpu=0 pid=7
INFO: Slab 0xc106eb00 used=6 fp=0xc3758430 flags=0x400020c3
INFO: Object 0xc3758430 @offset=1072 fp=0xc375b240
Bytes b4 0xc3758420: 00 00 00 00 b9 ea 09 00 5a 5a 5a 5a 5a 5a 5a 5a
....¹ê..ZZZZZZZZ
Object 0xc3758430: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
kkkkkkkkkkkkkkkk
Object 0xc3758440: 6a 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
jkkkkkkkkkkkkkkk
Object 0xc3758450: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
kkkkkkkkkkkkkkkk
Object 0xc3758460: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
kkkkkkkkkkkkkkkk
Object 0xc3758470: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
kkkkkkkkkkkkkkkk
Object 0xc3758480: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
kkkkkkkkkkkkkkkk
Object 0xc3758490: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
kkkkkkkkkkkkkkkk
Object 0xc37584a0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
kkkkkkkkkkkkkkkk
Redzone 0xc3758830: bb bb bb bb
»»»»
Padding 0xc3758858: 5a 5a 5a 5a 5a 5a 5a 5a
ZZZZZZZZ
[<c016db1a>] check_bytes_and_report+0xaa/0xe0
[<c016de48>] check_object+0x198/0x1e0
[<c016e2ac>] alloc_debug_processing+0x9c/0x130
[<c016ed9a>] __slab_alloc+0x10a/0x220
[<c03c412a>] pskb_expand_head+0x4a/0x140
[<c016fa12>] __kmalloc+0x72/0x80
[<c03c412a>] pskb_expand_head+0x4a/0x140
[<c03c412a>] pskb_expand_head+0x4a/0x140
[<c016e2d6>] alloc_debug_processing+0xc6/0x130
[<c03dbcc8>] netlink_broadcast+0x68/0x370
[<c02727fd>] kobject_uevent_env+0x32d/0x4e0
[<c02728e4>] kobject_uevent_env+0x414/0x4e0
[<c01858df>] d_kill+0x3f/0x60
[<c018591a>] dput+0x1a/0xf0
[<c02dbd7c>] device_del+0x1ac/0x2e0
[<c0360e88>] usb_disable_device+0x78/0xf0
[<c035b923>] usb_disconnect+0x93/0xf0
[<c035cb02>] hub_port_connect_change+0x2f2/0x3b0
[<c035cdd2>] hub_events+0x212/0x420
[<c0138470>] autoremove_wake_function+0x0/0x50
[<c035d005>] hub_thread+0x25/0x110
[<c0138470>] autoremove_wake_function+0x0/0x50
[<c0138470>] autoremove_wake_function+0x0/0x50
[<c035cfe0>] hub_thread+0x0/0x110
[<c0137e99>] kthread+0x59/0xa0
[<c0137e40>] kthread+0x0/0xa0
[<c0104df3>] kernel_thread_helper+0x7/0x14
=======================
FIX kmalloc-1024: Restoring 0xc3758440-0xc3758440=0x6b
FIX kmalloc-1024: Marking all objects used
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