Re: Page allocation failure (order 7) in UAS code

[Hans de Goede <hdegoede@redhat.com>]

Hi,

On 01-03-16 10:42, Yves-Alexis Perez wrote:
> Hi,
>
> [sorry if this is not the right point for reporting bugs, I took the email
> addresses from MAINTAINERS but please point me to the correct place if needed]
>
> I have an external USB drive (Samsung M3), which apparently uses the UAS code.
> Starting with 4.4 (from Debian sid, I could retry with vanilla if needed), I
> can't mount the drive anymore after a while (few hours/days uptime). Just
> plugging the disk, I get page allocation failure in kernel logs:

Can you try building a kernel with the following line in drivers/usb/storage/uas.c :

         .can_queue = 65536,     /* Is there a limit on the _host_ ? */

(around line 815) Replaced with

         .can_queue = MAX_CMNDS,

That should help as MAX_CMNDS is 256, so claiming that we can queue more
is not helpful, and that likely is what is causing this quite high order alloc.

Regards,

Hans