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Date: Sun, 19 Oct 2008 07:28:24 -0400 (EDT)
From: Justin Piszcz <jpiszcz@lucidpixels.com>
To: linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org
Subject: Re: Kernel 2.6.26.5 -> 2.6.27.2 [USB REGRESSION] (USB -> D_STATE)
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On Sun, 19 Oct 2008, Justin Piszcz wrote:

> With kernel 2.6.27.2, any processes attempting to use USB hang and go into 
> D-state, I have never had a problem like this before until 2.6.27.2 (I have 
> not tried 2.6.27.1 or 2.6.27)
>
> # lsusb -v
> <hangs>
>
> open("/dev/bus/usb", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|O_CLOEXEC) = 
> 3
> fstat64(3, {st_mode=S_IFDIR|0755, st_size=140, ...}) = 0
> getdents(3, /* 7 entries */, 4096)      = 112
> getdents(3, /* 0 entries */, 4096)      = 0
> close(3)                                = 0
> open("/dev/bus/usb/001", 
> O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|O_CLOEXEC) = 3
> fstat64(3, {st_mode=S_IFDIR|0755, st_size=80, ...}) = 0
> getdents(3, /* 4 entries */, 4096)      = 64
> open("/dev/bus/usb/001/004", O_RDWR)    = 4
> ioctl(4, USBDEVFS_CONNECTINFO
>
> nut (for UPS) does not start.
>
> nut       4078  0.0  0.0   1964   856 pts/8    D    07:09   0:00 
> /lib/nut/usbhid-ups -a belkin
> root      4170  0.0  0.0   2204  1072 pts/8    D+   07:11   0:00 lsusb -v
>
> Processes go directly to D-state with 2.6.27.2 for USB.
>
> Booting back to 2.6.26.5 now to see if everything works again.
>
> Back to 2.6.25.5, everything works fine:
>
> # lsusb Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> Bus 001 Device 004: ID 2040:7501 Hauppauge Bus 001 Device 001: ID 1d6b:0002 
> Linux Foundation 2.0 root hub
> Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> Bus 003 Device 002: ID 050d:1100 Belkin Components Bus 003 Device 001: ID 
> 1d6b:0001 Linux Foundation 1.1 root hub
> Bus 002 Device 002: ID 045e:0039 Microsoft Corp. IntelliMouse Optical
> Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
>
> Relevant configuration files and dmesg output:
>

http://home.comcast.net/~jpiszcz/20081019/2.6.25.5-usb-working.txt
http://home.comcast.net/~jpiszcz/20081019/2.6.27.2-usb-broken.txt
http://home.comcast.net/~jpiszcz/20081019/linux-2.6.25.5-config.txt
http://home.comcast.net/~jpiszcz/20081019/linux-2.6.27.2-config.txt

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