On Mon, Jun 29, 2009 at 05:18:03PM +0400, pluknet wrote: > 2009/6/29 Attilio Rao <atti...@freebsd.org>: > > 2009/6/29 pluknet <pluk...@gmail.com>: > >> 2009/6/29 Attilio Rao <atti...@freebsd.org>: > >>> 2009/6/29 pluknet <pluk...@gmail.com>: > >>>> 2009/6/26 pluknet <pluk...@gmail.com>: > >>>>> 2009/6/26 pluknet <pluk...@gmail.com>: > >>>>>> Hello. > >>>>>> > >>>>>> While building a module on nfs mounted /usr/src > >>>>>> I got an unkillable process waiting forever in bo_wwait. > >>>>> > >>>>> Small note: iface on NFS server has mtu changed from 1500 to 1450. > >>>>> Can this be a source of the problem? > >>>> > >>>> This is 100% reproducible. Lock in the same place. Any hints? > >>> > >>> Can you also show the value of ps? > >>> A precise map of what processes are doing would give an help. > >>> Also would be useful to printout traces for other threads and not only > >>> the stucked one. > >>> > >> > >> >From another run: > > > > I'm unable to see who would be locking the buffer object in question. > > Do you have INVARIANT_SUPPORT/INVARIANTS on? > > Yes, I do both. > > > What revision of /usr/src/sys/kern/vfs_bio.c are you running with? > > > > As of 6.4-R: CVS rev 1.491.2.12.4.1 / SVN rev 183531.
It seems that your changes of MTU cause nfs requests to never reach network. bo_wwait is the state where thread waits for all outstanding i/o on bufobj to drain.
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