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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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