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Date: Mon, 12 Feb 2001 11:14:48 +0100
From: Olaf Hering <[e-mail]>
To: Trond Myklebust <[e-mail]>
Cc: "H. Peter Anvin" <[e-mail]>, [e-mail],
  [e-mail]
Subject: Re: race in autofs / nfs
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On Mon, Feb 12, Trond Myklebust wrote:

> >>>>> " " == H Peter Anvin <[e-mail]> writes:
> 
>      > Olaf Hering wrote:
>     >>
>     >> Hi,
>     >>
>     >> there is a race in 2.4.1 and 2.4.2-pre3 in autofs/nfs.  When
>     >> the cwd is on the nfs mounted server (== busy) and you try to
>     >> reboot the shutdown hangs in "rcautofs stop". I can reproduce
>     >> it everytime.
>     >>
> 
>      > Sounds like an NFS bug in umount.
> 
> Or a dcache bug: the above points to a corruption of the mnt_count
> which is supposed to be > 0 if the partition is in use. I'm seeing a
> similar leak for ext2 partitions (not involving autofs or NFS).

Some more updates:

This machines run the upcoming 7.1-ppc with autofs-4.0.0pre9.
When I install 7.0-ppc it runs rocksolid with the same kernel binary.
7.0 came with autofs-4.0.0pre7:

Linux plum 2.4.1 #1 Sun Feb 11 11:56:01 GMT 2001 ppc unknown
Kernel modules         2.4.1
Gnu C                  2.95.3
Binutils               2.9.5.0.24
Linux C Library        x   1 root     root      4209204 Oct  4 21:42
/lib/libc.so.6
Dynamic linker         ldd (GNU libc) 2.1.3
Procps                 2.0.6
Mount                  2.10m
Net-tools              1.56
Kbd                    0.99
Sh-utils               2.0
Modules Loaded         snd-card-awacs snd-pcm snd-timer snd-mixer snd
soundcore ipv6 netlink_dev nfsd autofs bmac pcmcia_core

(hmm, it loads autofs and not autofs4 on 7.0?)

It hangs again after a while, in this case:
cc1plus  19126   181495  2903920        4 u01783c18 c44ca000   1 current
automoun 19129   183289  2932624       54 u0176a368 c42ca000   0 current
_spin_lock(c021b754) CPU#1 NIP c0 072f18 holder: cpu 0 pc C0057A18

I will try the older autofs package now.

Gruss Olaf

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