Re: Bug#733826: crazy loop "xhci_hcd Too many fragments"

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On Mon, 6 Jan 2014, Ben Hutchings wrote:

> On Sat, 2014-01-04 at 05:44 +0800, jidanni@xxxxxxxxxxx wrote:
> > >>>>> "BH" == Ben Hutchings <ben@xxxxxxxxxxxxxxx> writes:
> > BH> And what were those error messages?
> > BH> Which USB devices are you using (this is probably disk or network
> > BH> related)?
> > 
> > I had done an aptitude update on writing onto
> > # fdisk -l
> > Disk /dev/sdg: 3867 MB, 3867148288 bytes
> 
> OK, the important thing is it's usb-storage.
> 
> > 181 heads, 32 sectors/track, 1304 cylinders, total 7553024 sectors
> > Units = sectors of 1 * 512 = 512 bytes
> > Sector size (logical/physical): 512 bytes / 512 bytes
> > I/O size (minimum/optimal): 512 bytes / 512 bytes
> > Disk identifier: 0xc3072e18
> > 
> > # mount
> >    Device Boot      Start         End      Blocks   Id  System
> > /dev/sdg1              32      868799      434384   83  Linux
> > /dev/sdg2          868800     7553023     3342112   83  Linux
> > 
> > /dev/sdg2 on /var/cache/apt/archives type ext3 (rw,noatime,errors=remount-ro,data=ordered)
> > /dev/sdg1 on /var/lib/apt/lists type ext3 (rw,noatime,errors=remount-ro,data=ordered)
> > 
> > # cat /var/log/syslog
> > 
> > Jan  1 06:57:38 jidanni5 ntpd[2822]: Listen normally on 5 lo ::1 UDP 123
> > Jan  1 06:57:38 jidanni5 ntpd[2822]: Listen normally on 6 eth0 fe80::2289:84ff:fe28:ad9 UDP 123
> > Jan  1 06:57:38 jidanni5 ntpd[2822]: peers refreshed
> > Jan  1 06:57:38 jidanni5 ntpd[2822]: Listening on routing socket on fd #23 for interface updates
> > Jan  1 07:04:49 jidanni5 kernel: [  559.624680] xhci_hcd 0000:00:14.0: Too many fragments 79, max 63
> > Jan  1 07:04:49 jidanni5 kernel: [  559.624695] xhci_hcd 0000:00:14.0: Too many fragments 79, max 63
> > Jan  1 07:04:49 jidanni5 kernel: [  559.624704] xhci_hcd 0000:00:14.0: Too many fragments 79, max 63
> > 
> > 100000 lines later... oops I mean an actual MILLION lines later
> 
> Assuming my fix for the repetition is correct, the remaining problem is
> why usb-storage is generating such large/fragmented urbs.

usb-storage doesn't generate large or fragmented anything.  It merely 
passes on the scatter-gather information it gets from the block layer.

Alan Stern

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