Re: kern/42455: tstile hang with nfs

["Christoph Egger" <Christoph_Egger%gmx.de@localhost>]

>  hi,
>  
>  >>  >  I added some more debug lines and figured out that the macro
>  >>  >  nfsm_wcc_data() drops the mbuf chain w/o decreasing
>  >>  >  ctxt.nwc_mbufcount.
>  >>  
>  >>  The nfsm_wcc_data() macro calls the nfsm_postop_attr() macro.
>  >>  The nfsm_postop_attr() macro calls nfsm_loadattrcache() function.
>  >>  The nfsm_loadattrcache() function calls nfsm_disct() function.
>  >>  
>  >>  nfsm_disct() is the function in error which drops the mbuf chain.
>  
>  are you sure?

yes, absolutely and reproducable.

>  iirc, nwc_mbufcount is about sending mbuf.  otoh, nfsm_disct
>  is for received mbuf.

nfs_writerpc *does* call nfsm_disct() through nfsm_wcc_data,
nfsm_postop_attr and nfsm_loadattrcache in this order.

So you are saying this should never happen?

Christoph