[issue1872] nfs stall (fix pushed)

[Matthew Dillon]

:Thomas Nikolajsen <thomas.nikolajsen at mail.dk> added the comment:
:
:Some more info:
:console messages are like:
:got bad cookie vp 0xe09ddf38 bp 0xc480aa6c
:[diagnostic] cache_lock: blocked on 0xe32b26d8 "rate_sample"
:
:The bad cookie lines doesn't seem to cause stall, only the cache_lock lines.

    The cache lock lines are side effects due to whatever getting
    stalled also probably holding a vnode lock.

    So what we have here is a likely situation where the SMP NFS client
    is to blame.  With that in mind a forced core dump would be useful
    but to make it easier to track down please try to kill all the normal
    processes on the box, leaving just the ones that cannot be killed.

    Note that normal nfs mounts must be used.  Do not use the 'intr' or 'soft'
    options or even the stalled processes might be killable, which is not
    what we want.

						-Matt