On 05/14/2012 06:19 PM, Alan Stern wrote:
On Mon, 14 May 2012, Oncaphillis wrote:
length m/n tells you the actual_length/transfer_buffer_length
The last pair while accessing the tranfer_buffer seems to be 0/512
<snip>
=== proc_do_submiturb uurb->type==1:USBDEVFS_URB_TYPE_INTERRUPT alloc
tb:0xffff880077cfadf0 (512)
=== async_completed status==0 length:2/512 e=0
tb:0xffff880077cfadf0[00][41] last tb:0xffff880079612690[6b][6b]
=== free_async free tb:0xffff880077cfadf0
=== proc_do_submiturb uurb->type==1:USBDEVFS_URB_TYPE_INTERRUPT alloc
tb:0xffff880077cfadf0 (512)
=== async_completed status==-2 length:0/512 e=0
Status = -2 means this URB was unlinked. What does "e=0" mean?
Sorry - missed this line "e" is the urb->error_count
tb:0xffff880077cfadf0[6b][6b] last tb:0xffff880077cfadf0[6b][6b]
=== free_async free tb:0xffff880077cfadf0
=== proc_do_submiturb uurb->type==3:USBDEVFS_URB_TYPE_BULK alloc
tb:0xffff880079612690 (2)
=== async_completed status==0 length:2/2 e=0
tb:0xffff880079612690[9d][8d] last tb:0xffff880077cfadf0[9d][8d]
=== free_async free tb:0xffff880079612690
=============================================================================
BUG kmalloc-512 (Not tainted): Poison overwritten
-----------------------------------------------------------------------------
INFO: 0xffff880077cfadf0-0xffff880077cfadf1. First byte 0x9d instead
of 0x6b
</snip>
Which host controller driver is this device using? And what type of
device is it?
Now I also saw this bug on this hardware:
<snip>
00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2 EHCI
Controller (rev 01) (prog-if 20 [EHCI])
Subsystem: NEC Corporation Device 834f
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR+ FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium
>TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0
Interrupt: pin A routed to IRQ 23
Region 0: Memory at d8500000 (32-bit, non-prefetchable) [size=1K]
Capabilities: [50] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA
PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [58] Debug port: BAR=1 offset=00a0
Kernel driver in use: ehci_hcd
</snip>
I also have a machine with a VIA USB Controler which I will test this
evening
Thanks
Alan Stern
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