Re: [uml/do_xor_speed] WARNING: CPU: 0 PID: 1 at init/main.c:708 do_one_initcall()

[Boaz Harrosh <bharrosh@panasas.com>]

On 04/10/2014 09:53 AM, Fengguang Wu wrote:
> Hi Boaz,
> 
> I catch the below warning again in
> 
> git://git.open-osd.org/linux-open-osd.git raid6
> 

OK Thanks. Daa I thought I fixed it but I forgot the obvious problem.

I pushed a new tree I think it might be good this time. (finally)

Thanks
Boaz


> commit 60e833d86a01ad9d8204a04b8db324106ab50395
> Author:     Boaz Harrosh <bharrosh@panasas.com>
> AuthorDate: Thu Jul 19 15:22:37 2012 +0300
> Commit:     Boaz Harrosh <bharrosh@panasas.com>
> CommitDate: Tue Apr 8 08:42:14 2014 +0300
> 
>     RFC: do_xor_speed Broken on UML do to jiffies
>     
>     Remember that hang I reported a while back on UML. Well
>     I'm at it again, and it still hangs and I found why.
>     
>     I have dprinted jiffies and it never advances during the
>     loop at do_xor_speed. There for it is stuck in an endless
>     loop. I have also dprinted current_kernel_time() and it
>     returns the same constant value as well.
>     
>     Note that it does usually work on UML, only during
>     the modprobe of xor.ko while that test is running. It looks
>     like some lucking is preventing the clock from ticking.
>     
>     However ktime_get_ts does work for me so I changed the code
>     as below, so I can work. See how I put several safety
>     guards, to never get hangs again.
>     And I think my time based approach is more accurate then
>     previous system.
>     
>     UML guys please investigate the jiffies issue? what is
>     xor.ko not doing right?
>     
>     Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
> 
<>
> [    0.383315] WARNING: CPU: 0 PID: 1 at init/main.c:708 do_one_initcall+0x11d/0x136()