On Wed, 6 Jun 2007 01:56:01 +0000 "young dave" <[email protected]> wrote:
> 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
I don't get it. device_release() doesn't call kfree() or kmem_cache_free()
or any such thing.
> 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
Could perhaps be due to bluetooth-postpone-hci_dev-unregistration.patch,
but I don't see how. (But that patch looks a bit dodgy wrt module unload
so I think I'll drop it).
Are you able to reproduce this in 2.6.22-rc4?
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