[ale] Close port

[Vernard Martin]

NFS is ubiquitos but has issues. Try out OrangeFS or Lustre :-)


On 1/3/2014 10:49 AM, Jim Kinney wrote:
>
> That makes more sense. It would _have_ to be a kernel thread that 
> choked. So NFS is a highly likely culprit. NFS share of an iscsi or 
> fiber channel connection that drops and times out has been involved.
>
> If NFS weren't so useful, I would never use it again.
>
> On Jan 3, 2014 10:22 AM, "Derek Atkins" <derek at ihtfp.com 
> <mailto:derek at ihtfp.com>> wrote:
>
>     Jim,
>
>     On Fri, January 3, 2014 10:03 am, Jim Kinney wrote:
>     > That's the "well behaved" process. I'm looking for a solution at the
>     > kernel
>     > control level that can alter the list of ports the kernel
>     manages for the
>     > aberrant process that hangs with an open port and dies leaving
>     it open. It
>     > feels like a kernel bug to have an open port with no process
>     attached.
>     > Closing a port with the owning process still running would be a
>     useful
>     > tool
>     > for testing that process' response to a system failure.
>
>     That would be a major kernel bug.  When a process dies (not
>     zombies, but
>     actually gets reaped) all open ports get closed.  I've never seen
>     a kernel
>     fail to reap that properly (although there are socket options to
>     let it be
>     reused quickly, like SO_REUSEADDR).
>
>     More likely what happened here is that a *kernel thread* died and
>     did not
>     get cleaned up properly.  E.g. if NFS was running out of the
>     kernel and a
>     mountpoint died in a mysterious way, it could be possible that it
>     didn't
>     get reaped properly.  Unlikely, but possible.
>
>     But yes, it is probably a kernel bug you are seeing.
>
>     -derek
>
>     --
>            Derek Atkins 617-623-3745 <tel:617-623-3745>
>     derek at ihtfp.com <mailto:derek at ihtfp.com> www.ihtfp.com
>     <http://www.ihtfp.com>
>            Computer and Internet Security Consultant
>
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