df hangs on nfs automounter in 2.6.0-current

df hangs on nfs automounter in 2.6.0-current

[Meelis Roos]

Current 2.6.0 (2.6.0-test5+BK as of 16.09) hangs on df when
the am_utils automounter is in use. It displays hda* partitions and next
by mountpoint list is amd but then df hangs, wchan is rpc_execu*

dmesg only tells
nfs warning: mount version older than kernel
like it always does with current 2.6 kernels for me.

x86, debian unstable.

-- 
Meelis Roos (mroos@linux.ee)

Re: df hangs on nfs automounter in 2.6.0-current

[Trond Myklebust]

>>>>> " " == Meelis Roos <mroos@linux.ee> writes:

     > Current 2.6.0 (2.6.0-test5+BK as of 16.09) hangs on df when the
     > am_utils automounter is in use. It displays hda* partitions and
     > next by mountpoint list is amd but then df hangs, wchan is
     > rpc_execu*

Please reproduce using ordinary 'mount'...

Cheers,
  Trond

Re: df hangs on nfs automounter in 2.6.0-current

[Meelis Roos]

>      > Current 2.6.0 (2.6.0-test5+BK as of 16.09) hangs on df when the
>      > am_utils automounter is in use. It displays hda* partitions and
>      > next by mountpoint list is amd but then df hangs, wchan is
>      > rpc_execu*
>
> Please reproduce using ordinary 'mount'...

Seems that am-utils (or other userland) is at fault - it breaks with
2.4.23-pre4 too...

-- 
Meelis Roos (mroos@ut.ee)      http://www.cs.ut.ee/~mroos/

Re: df hangs on nfs automounter in 2.6.0-current

[Ion Badulescu]

On Tue, 16 Sep 2003 17:35:49 +0300 (EEST), Meelis Roos <mroos@linux.ee> wrote:
> Current 2.6.0 (2.6.0-test5+BK as of 16.09) hangs on df when
> the am_utils automounter is in use. It displays hda* partitions and next
> by mountpoint list is amd but then df hangs, wchan is rpc_execu*

You're going to have to figure out what amd is doing at that point -- 
whether it's dead, spinning, waiting for a child process, or something 
else. Hanging on df is the expected behavior if amd is not responding to 
nfs requests.

Ion
[amd co-maintainer]

-- 
  It is better to keep your mouth shut and be thought a fool,
            than to open it and remove all doubt.

Re: df hangs on nfs automounter in 2.6.0-current

[Meelis Roos]

> You're going to have to figure out what amd is doing at that point --
> whether it's dead, spinning, waiting for a child process, or something
> else. Hanging on df is the expected behavior if amd is not responding to
> nfs requests.

It was actually a network configuration problem - I got a wrong IP via
DHCP and changed it to the right one manually. So network was
configured, portmap+amd started, IP address changed from under amd and
then amd hung. Fixing the network configuration made the hang go away so
I will probably not dig into the reasons why amd hangs indefinitely when
the IP chnages.

The kernel is certainly not at fault, it was my bad.

-- 
Meelis Roos (mroos@linux.ee)