From: Totsch, David Lee (david.totsch@hp.com)
Date: Mon Nov 28 2005 - 15:39:34 EST
Randy:
A process that is running at priority less than PZERO is not signalable
(see /usr/include/sys/param.h). Those priorities are "didling with an
inode, low-level I/O, write lock, etc. In other words, it is doing
something that you really don't it to suddenly stop in the middle of (if
it is in the middle of modifying an inode and it stops, file corruption,
if not file system corruption, is a distinct possibility). If you have
GlancePlus, go in and look at the PID and see what its wait states are,
and maybe take a peek at the open resources.
Another tactic you might take would be to identify ALL of the "core"
files on your system, then send an ABRT signal; this will create a core
file if successful. All of the bad things about sending a KILL apply
(no gracefully closed anything: open files, shared memory segs, etc.).
And, someone might be able to examine the core file to see what was
going on.
-dlt-
> -----Original Message-----
> From: hpux-admin-owner@DutchWorks.nl
> [mailto:hpux-admin-owner@DutchWorks.nl] On Behalf Of Randy
> Millis (lists account)
> Sent: Monday, November 28, 2005 11:38 AM
> To: Lodge, David
> Cc: hpux-admin@DutchWorks.nl
> Subject: [HPADM] Re: RP5450 HP-UX B.11.00 load increasing
> after reboot?
>
>
> > A kill -KILL is essentially taking a shotgun to the process; rather
> > than
> asking the process to die nicely; the kernel steps in and
> swats it. A program cannot refuse to process a KILL signal,
> unless it runs in kernel space.
>
> My other kill attepts failed as well.
>
> > So if a process is not defunct (i.e. there is no process to process
> > the
> signal) and it isn't responding to a kill -KILL then it is
> blocking in the kernel. This is *usually* blocking on
> hardware (though it can block on other things - e.g. NFS can
> block like this as NFS runs in the kernel). It may also mean
> it's blocking on IPC (e.g. semaphores)
>
> I understand better now. Thanks.
>
> Side note: No NFS running here.
>
> > If you have glance, check for why it's blocking and what
> it's blocking
> > on;
> this may indicate where the deadlock is.
>
> > If you don't have glance then you're a bit blind.
>
> No glace license. :-(
>
> > First thing I'd do would be to kill the client off as far
> as you can -
> cleanly first (e.g. through /sbin/init.d) and hard if you
> can't. Then clean up and semaphores that are open (IPCS) -
> glance is useful for this. Again, if you have glance, you can
> look at what files are open and deal with these (lsof, if
> installed, can also do this).
>
> No kill attempts seemed to work. Only rebooting.
>
> > Check /var/adm/syslog/syslog.log and dmesg for any obvious
> errors with
> hardware or other kernel messages (dmesg may be the most useful here)
>
> Nothign I can see in either that appear hardware related.
>
> > These sorts of problems are the worst to solve and usually the
> > quickest
> way is to bounce the box - though this is drastic!
>
> Trouble is it keeps coming back.:-(
>
>
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