Re: [GIT PATCH] USB patches for 2.6.17

[Linus Torvalds <torvalds@osdl.org>]

On Wed, 21 Jun 2006, Greg KH wrote:
>
> Here are a lot of USB patches for 2.6.17.  They do the following:

I think these may be responsible for:

	Bluetooth: L2CAP ver 2.8
	Bluetooth: L2CAP socket layer initialized
	Bluetooth: HIDP (Human Interface Emulation) ver 1.1
	Bluetooth: RFCOMM socket layer initialized
	Bluetooth: RFCOMM TTY layer initialized
	Bluetooth: RFCOMM ver 1.7
	BUG: unable to handle kernel paging request at virtual address 5a5a5a5a
	 printing eip:
	c02a58f8
	*pde = 00000000
	Oops: 0000 [#1]
	SMP 
	Modules linked in: rfcomm hidp l2cap hci_usb bluetooth ip_conntrack_netbios_ns ipt_REJECT iptable_filter ip_tables ip6table_filter ip6_tables cpufreq_ondemand lp pcspkr intel_agp agpgart
	CPU:    0
	EIP:    0060:[<c02a58f8>]    Not tainted VLI
	EFLAGS: 00210206   (2.6.17-gd588fcbe #211) 
	EIP is at usbdev_open+0xb4/0x1ec
	eax: 0bd00005   ebx: 5a5a5a5a   ecx: 5a5a58d2   edx: dd991e4c
	esi: de020bdc   edi: c712da68   ebp: c6eeaee8   esp: c6eeaeac
	ds: 007b   es: 007b   ss: 0068
	Process hid2hci (pid: 3719, threadinfo=c6eea000 task=ddfb8570)
	Stack: c854dc28 dd22cd70 00000000 00000005 c6eeaed4 c016bd39 c6eeaf3c 00000001 
	       c6eea000 00000000 dd22cd70 c6eeaee8 00000000 c050b8a0 dd22cd70 c6eeaf04 
	       c01678a4 c854dc28 c6eeaf04 c854dc28 dd22cd70 00000000 c6eeaf20 c015e424 
	Call Trace:
	 <c0103c46> show_stack_log_lvl+0x85/0x8f  <c0103dc3> show_registers+0x13b/0x1af
	 <c0103fac> die+0x175/0x285  <c011a86d> do_page_fault+0x428/0x522
	 <c0103777> error_code+0x4f/0x54  <c01678a4> chrdev_open+0x11a/0x171
	 <c015e424> __dentry_open+0xc8/0x1ab  <c015e575> nameidata_to_filp+0x1c/0x2e
	 <c015e5b5> do_filp_open+0x2e/0x35  <c015e5fc> do_sys_open+0x40/0xba
	 <c015e6a2> sys_open+0x16/0x18  <c0102c0f> sysenter_past_esp+0x54/0x75
	Code: 00 8b 35 cc 77 61 c0 8b 8e 9c 00 00 00 81 e9 88 01 00 00 eb 16 8b 45 d0 0d 00 00 d0 0b 39 81 94 01 00 00 74 81 8d 8b 78 
	fe ff ff <8b> 99 88 01 00 00 0f 18 03 90 8d 91 88 01 00 00 8d 86 9c 00 00 
	EIP: [<c02a58f8>] usbdev_open+0xb4/0x1ec SS:ESP 0068:c6eeaeac

where that 5a5a5a5a is possibly/probably due to SLAB debugging (it's the 
"POISON_INUSE" pattern)

It might have happened before too, of course, I just haven't seen it 
before (even though I've had SLAB debugging on all the time on that 
machine).

It seems to actually be from usbdev_lookup_minor(), which has been inlined 
(damn compiler), and it's the "node.next" access in the

	list_for_each_entry(device, &usb_device_class->devices, node) {

loop.

Any ideas? 

			Linus
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