[Lustre-discuss] Lustre 2.5.2 Client Errors

[Drokin, Oleg]

Hello!

   I guess I don't have any smart ideas about what's goinf on.
   Is the number after "LustreError" the same most of the time? that's pid, so you can chek what's the process doing it.
   Also I imagine you can add a dump_stack() call to that condition in the source so that a backtrace is printed and we know what is the call path.

Bye,
    Oleg
On Aug 26, 2014, at 12:28 AM, Murshid Azman wrote:

> Hello Oleg,
> 
> Thanks for your response.
> 
> The kernel I'm using is 2.6.32-279.19.1.el6.x86_64
> 
> This client mounts NFS shares from another server. They're not mounted directly onto Lustre filesystem, but rather onto a tmpfs filesystem residing in the memory.
> 
> [root at node01 ~]# df -h /
> Filesystem            Size  Used Avail Use% Mounted on
> tmpfs                  50M  484K   50M   1% /
> 
> I've removed the NFS mounts but can still see the same error. This client does not share NFS to others.
> 
> Thank you.
> 
> Murshid Azman.
> 
> 
> 
> On Fri, Aug 22, 2014 at 9:12 PM, Drokin, Oleg <oleg.drokin at intel.com> wrote:
> Hello!
> 
> On Aug 22, 2014, at 3:28 AM, Murshid Azman wrote:
> > We're trying to run a cluster image on Lustre filesystem version 2.5.2 and repeatedly seeing the following message. Haven't seen anything bizarre on this machine other than this:
> >
> > 2014-08-22T13:52:01+07:00 node01 kernel: LustreError: 4271:0:(namei.c:530:ll_lookup_
> > it()) Tell Peter, lookup on mtpt, it open
> > 2014-08-22T13:52:01+07:00 node01 kernel: LustreError: 4271:0:(namei.c:530:ll_lookup_it()) Skipped 128 previous similar messages
> >
> > This doesn't happen to our desktop Lustre clients.
> >
> > I'm wondering if anyone has any idea what this means.
> 
> This is one of those "impossible condition has been met" messages. Essentially it means that we got a lookup call for a mountpount,
> which should not happen because it's a mountpoint, so it's always valid and pinned in memory at the very least.
> 
> What kernel do you use? anything else interesting about this client - e.g. NFS rexport?
> 
> Bye,
>     Oleg
>