Automount hangs when run from NFS mounted root.

From: <P.Lister_at_cranfield.ac.uk>
Date: Fri, 07 Feb 97 17:24:33 +0000

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DEC UNIX 4.0B, on an Alphastation 255.

When the 255 boots from a root filesystem on its local disk, automount
mounts NFS filesystems with no problem. When the same machine boots
"diskless" via BOOTP/TFTP, using an NFS mounted copy of the same root
filesystem everything works fine *until*, a process prompts automount
to mount a filesystem. Automount process then hangs (i.e goes into an
uninterruptible sleep - ps reports "U" status), and any process trying
to refer to a NFS filesystem handled by the automounter also hangs.

In the diskless state where automount is *NOT* running, we can hand
mount the same remote filesystems and everything works. The hang
always happens, though the behaviour is not quite constant; the
automounter has occasionally succeeded in mounting a filesystem before
hanging. Usually the hang is so immediate that there's no time to see
if the mount has happened.

It appears that automount just doesn't like an NFS mounted root;
anyone have an explanation or a fix?

Peter Lister Email: p.lister_at_cranfield.ac.uk
Computer Centre, Cranfield University Voice: +44 1234 754200 ext 2828
Cranfield, Bedfordshire MK43 0AL UK Fax: +44 1234 751814
   The more we look at structures of trust, the more we realise that
   democracy and subversion are closely related. (Ross Anderson)



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Received on Fri Feb 07 1997 - 18:43:59 NZDT

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