Oops in usb core when running traffic with libusb.

[chuckf]

I'm not sure if this is the best place to ask this, but it seems like
the guys on this mailing list are pretty knowledgeable about the usb
subsystem.

I have a situation where I get an Oops from processcompl() in
usb/core/devio.c running with a 2.6.28.4 kernel on an embedded mips
platform.

I have a read thread that constantly calls libusb_bulk_transfer() on the
IN endpoint. libusb_bulk_transfer() calls op_handle_events()which
eventually calls IOCTL_USBFS_REAPURBNDELAY ioctl. The ioctl calls
proc_reapurbnonblock() which calls async_getcompleted() in devio.c which
returns a pointer to an async struct which contains a completed urb.

Sometimes this urb seems to be corrupted occasionally when I
send/receive a lot of packets.

Has anyone seen this kind of problem?
Do you recommend asking on a different forum?

Thanks,
chuck fossen

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[Peter Stuge-4]

Chuck Fossen wrote:
> Has anyone seen this kind of problem?

It seems it's a kernel problem, so it would probably appear also
without libusb?


> Do you recommend asking on a different forum?

linux-usb-devel would probably be better. Maybe cc the MIPS
community?


//Peter

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[Alan Stern]

On Fri, 16 Oct 2009, Chuck Fossen wrote:

> I'm not sure if this is the best place to ask this, but it seems like
> the guys on this mailing list are pretty knowledgeable about the usb
> subsystem.
>
> I have a situation where I get an Oops from processcompl() in
> usb/core/devio.c running with a 2.6.28.4 kernel on an embedded mips
> platform.
>
> I have a read thread that constantly calls libusb_bulk_transfer() on the
> IN endpoint. libusb_bulk_transfer() calls op_handle_events()which
> eventually calls IOCTL_USBFS_REAPURBNDELAY ioctl. The ioctl calls
> proc_reapurbnonblock() which calls async_getcompleted() in devio.c which
> returns a pointer to an async struct which contains a completed urb.
>
> Sometimes this urb seems to be corrupted occasionally when I
> send/receive a lot of packets.
>
> Has anyone seen this kind of problem?
> Do you recommend asking on a different forum?

You should ask on the kernel USB mailing list,
<linux-usb@...>, since this is a problem in the kernel and
not in libusb.

Does it still occur with a 2.6.31 kernel?

Alan Stern



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