Re: Large USB storage devices cause df to hang and cpu load reaches 100%

I have also noticed this delay and have through instrumenting code
have found that every block in the device gets read in.  I never
checked if it was something in the df, filesystem, SCSI, or USB
subsystems that was causing this.  I am usually doing df on USB
storage devices formated as FAT 32 w/ and w/o LBA.

Branden

On 7/31/07, Alan Stern <[email protected]> wrote:
> On Tue, 31 Jul 2007, Kostas Peletidis wrote:
>
> > Hi Alan,
> >
> > I enabled CONFIG_USB_DEBUG and reproduced the problem but didn't see any
> > messages in the dmesg output. To ensure that the debug code was indeed
> > built in I unplugged the disk then plugged it back in. I got quite a few
> > messages, here are the last of them:
>
> > I see most of these messages at boot time even with older 2.6 kernels.
>
> Yes, they are normal.
>
> > The problem appears after the "device scan complete" message is traced.
> >
> > The patch that caused this issue was added between the 2.6.21.5 and
> > 2.6.22 releases. The only patch that led to 2.6.21.6 had to do with
> > nf_conntrack_h323 so this leaves us with the patches between 2.6.21.6
> > and 2.6.22. There are quite a few usb changes in that changelog so I was
> > hoping that someone might recognise/remember something relevant.
>
> I'd guess that this was caused by a change somewhere else in the
> kernel, not in the USB stack.  My advice now is the same as Matt's was:
> turn on CONFIG_USB_STORAGE_DEBUG and see what you get.
>
> Alan Stern
>
>
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