Re: Grant Table Error on 2.6.32.36 + Xen 4.0.1

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Tue, Apr 12, 2011 at 02:48:36PM +0800, MaoXiaoyun wrote:
> 
> Hi:
>  
>       We are just about to try the new Kernel, but confront Error on grant table.

Please open a new thread on this one. This is getting confusing.
>         
>      2.6.32.36 Kernel: http://git.kernel.org/?p=linux/kernel/git/jeremy/xen.git;a=commit;h=bb1a15e55ec665a64c8a9c6bd699b1f16ac01ff4
>      Xen 4.0.1 http://xenbits.xen.org/hg/xen-4.0-testing.hg/rev/b536ebfba183
>        
>     Our test is simple, 24 HVMS(Win2003 )  on a single host, each HVM loopes in restart every 15minutes.
>     Please refer to error log from serial output 
>               
>     I've traced the log a bit, and the log is from xen/common/grant_table.c
>  
> 1) log " grant_table.c:1717:d0 Bad grant reference 4294965983 " if from 
> 
> 1715     if ( unlikely(gref >= nr_grant_entries(rd->grant_table)) ){
> 1716         PIN_FAIL(unlock_out, GNTST_bad_gntref,
> 1717                  "Bad grant reference %ld\n", gref);
> 1718         BUG();
> 1719     }
>  
> 2) log "grant_table.c:266:d0 Bad flags (0) or dom (0). (expected dom 0) " is from 
>  
>   grant_table.c:1967 =>  __acquire_grant_for_copy  => _set_status
>  
>  ( not from __gnttab_map_grant_ref, since I add some log to identify this )
> 
> The log shows that all are from gnttab_copy, which I later found only netback
> has grant copy hypercall. 
>  
> I also tried netback code from 2.6.31(which works well with kernel 2.6.31), but
> still met these errors. So it looks like it is kernel related.
>  
> What happened for this, will this harmful for the usage of HVM?

What is the storage for your HVM guests? iSCSI?