9-STABLE -> NFS -> NetAPP:

[Rick Macklem]

Marc Fournier wrote:
> On 2013-02-13, at 14:50 , Rick Macklem <rmacklem at uoguelph.ca> wrote:
> 
> > He does get the odd error reported by nfs_getpages() and I don't
> > think we've isolated why yet. The error is 13 (EACCES), but jhb@
> > thought it might be because of the bug he fixed where the krpc
> > reported EACCES for the EINTR case. I don't think we've heard
> > back from Marc w.r.t. whether he has gotten any more of these
> > erros logged since applying jhb@'s patch and whether or not
> > the errno has changed to EINTR?
> 
> As mentioned previously, it doesn't happen all that often … this
> latest one was after 21 days of uptime (or so) … I just upgraded the
> kernel on that machine to take into consideration changes to hfs
> *since* the last upgrade, so it might be another 20-30 days before it
> happens again *if* that last patch didn't' fix it …
> 
> I have several servers that do have fully operational remote consoles
> though … to save time if/when it happens next, what do I all need to
> run?
> 
> ps auxlH
> procstat -kk <pid> (for which process? … all part of that "group", or
> just one of the apparently hung processes?)
The pid that is in "T" state for the "ps auxlH".

> sysctl debug.kdb.break_to_debugger=1 (shell)
> <ctl><alt><esc> (from console)
> 
Then the commands described in:
http://www.freebsd.org/doc/en_US.ISO8859-1/book/developers-handbook/kerneldebug-deadlocks.html
"show alllocks" and "show lockedvnods" may be the most useful, I think
you can also
"show sleepchain <pid>"
"show lockchain <pid>"
using the <pid> that is in "T" state.

If you haven't built your kernel with "options WITNESS", this won't work well.

> now, is there a way of forcing it to do a dump core so that I can run
> the various commands from a shell *after* its rebooted?
No idea. Someone familiar with what you can do to core dump and how to
get your system to make will have to answer this.

> Not
> particularly easy to redirect console output to a file (or is it?), so
> anything that scrolls off the screen is pretty much lost … I'm using a
> DRAC card in most cases, no serial consoles or anything like that that
> I can run within a script session … a 'ps' listing is >500 lines long,
> just to give an idea ...
> 
> 
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