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Subject: Re: What is a 10.10.10.20-man process?
From: Jeff Layton <jlayton@poochiereds.net>
To: Ziemowit Pierzycki <ziemowit@pierzycki.com>,
        Benjamin Coddington
	 <bcodding@redhat.com>
Cc: linux-nfs@vger.kernel.org
Date: Fri, 15 Apr 2016 07:16:17 -0400
In-Reply-To: <CAOiTGHmsmwLsA9wOzpVi50YG4=C9Cd80Tg=e1JCJLjwXxj9k4g@mail.gmail.com>
References: <loom.20160414T205732-249@post.gmane.org>
	 <alpine.OSX.2.19.9992.1604141506460.55780@planck>
	 <CAOiTGHmsmwLsA9wOzpVi50YG4=C9Cd80Tg=e1JCJLjwXxj9k4g@mail.gmail.com>
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List-ID: <linux-nfs.vger.kernel.org>

On Thu, 2016-04-14 at 14:15 -0500, Ziemowit Pierzycki wrote:
> [<ffffffffa012d158>] rpc_wait_bit_killable+0x38/0x80 [sunrpc]
> [<ffffffffa012d11d>] __rpc_wait_for_completion_task+0x2d/0x30
> [sunrpc]
> [<ffffffffa05caf30>] nfs4_run_open_task+0x130/0x1a0 [nfsv4]
> [<ffffffffa05cd77d>] nfs4_open_recover_helper+0x16d/0x230 [nfsv4]
> [<ffffffffa05cd875>] nfs4_open_recover+0x35/0xb0 [nfsv4]
> [<ffffffffa05cff5d>] nfs4_open_expired.isra.60+0xcd/0x180 [nfsv4]
> [<ffffffffa05d003e>] nfs40_open_expired+0x2e/0x40 [nfsv4]
> [<ffffffffa05e3805>] nfs4_do_reclaim+0x175/0x5f0 [nfsv4]
> [<ffffffffa05e416e>] nfs4_run_state_manager+0x4ee/0x7d0 [nfsv4]
> [<ffffffff810bc8b8>] kthread+0xd8/0xf0
> [<ffffffff8177999f>] ret_from_fork+0x3f/0x70
> [<ffffffffffffffff>] 0xffffffffffffffff
> 
> Waiting for something to complete but it can't?
> 

Yes. That stack means that it's trying to reclaim an open file (on
NFSv4.0), and is waiting on the reply.

> On Thu, Apr 14, 2016 at 2:08 PM, Benjamin Coddington
> <bcodding@redhat.com> wrote:
> > 
> > 
> > On Thu, 14 Apr 2016, Ziemowit PIerzycki wrote:
> > 
> > > 
> > > I have a strange issue when NFS4 mounts to a Netapp filer freeze
> > > on my Linux
> > > KVMs.  Looking over few things I noticed a process "10.10.10.20-
> > > man" is in D
> > > state but I can't find anything information about it.  Mainly
> > > because
> > > 10.10.10.20 is the IP of the filer and searching for "-man" is
> > > too generic.
> > > 
> > > Why would this process be frozen?
> > This is the nfs4 state manager process.  What's in the file:
> > /proc/<pid of that process>/stack
> > 
> > Ben
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-- 
Jeff Layton <jlayton@poochiereds.net>