Re: INVALID Linux 3.8-rc1 - another regression on USB :-(

From: Woody Suwalski
Date: Tue Jan 01 2013 - 10:18:23 EST

Woody Suwalski wrote:
Greg Kroah-Hartman wrote:
On Sun, Dec 23, 2012 at 02:35:49PM -0800, Linus Torvalds wrote:
Any chance you can bisect this? It's not going to be hugely pleasant
(with 11k+ commits in between 3.7 and 3.8-rc1 you'll have to compile
and test at least 14 kernels), but it would help enormously. Of
course, maybe some USB person can guess what would cause the device to
go offline..

Added Greg and the linux-usb mailing list to the participants list:
the images are in the original email on lkml, but there isn't anything
particularly interesting there, it really just seems to be an
unexpected and spurious USB disconnect, resulting in "USB disconnect,
device number 2" followed by "Rejecting I/O to offline device".
I don't see any images on lkml, sorry.

The kernel log for when the disconnect happened would be great to get.

The kernel can't cause a device to disconnect, that's an electrical
thing usually, is this perchance a flaky device/connection? Or has it
always worked on older kernels?

What host controller is being used here (xhci, ehci, etc.?)


greg k-h
I backtrack - it is not directly a USB problem.
If I boot the image into a single mode, and then verify reading the squashfs as a compressed file or the files in the mounted uncompressed image - there are no errors on read.
Yet if i let it boot into X - it does not - gets bogged with disk access errors.
And then there is no access to a USB key anymore.
Will need to investigate further..

Sorry for the alarm, Greg...

Problem must be caused by third-party patches - tests with vanilla+overlayfs show that all works as expected.

Happy New Year 2013
redfaced Woody

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