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Re: kern/42455: tstile hang with nfs

>  next=0x0 => mb is not a chained mbuf.
>  nwc.mbuf_count is initialized with 1
>  and nwc.mbuf_count is decreased by one right before it enters
>  the while loop with 'cv_wait' so ctxt.nwc_mbuf_count must have
>  been 2 before it entered the loop.
>  There is only one way to increase nwc.mbuf_count: it must run
>  the path where MEXTADD() is used which chains an mbuf to 'mb'.

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.


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