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and subject line Bug#89029: fixed in am-utils 6.1.1-1
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Date: Fri, 9 Mar 2001 14:05:27 +0100
From: Sergio Gelato <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
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Subject: amd gets confused, /etc/mtab and /proc/mounts disagree
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Package: am-utils
Version: 6.0.5-1
Severity: important
This problem has also been seen with the older amd package that is in
Debian 2.2.
My kernel is 2.2.18 with NFSv3 enabled over UDP (but not TCP). The kernel
was compiled with gcc272. (gcc 2.95.2 miscompiles the kernel in ways that
affect umount(2) functionality.) But from my understanding of the problem,
I don't expect it to be specific to this kernel minor version. I even doubt
it's limited to Linux 2.2.
Symptoms: indirect mounts of home directories (I have a /home map) can
time out while the user still has processes on the system. amd then
attempts an unmount. This fails with EBUSY (according to syslog), yet
the entry is removed from /etc/mtab. The mount is still listed in
/proc/mounts, however. Subsequent attempts to access the automounted
filesystem fail: amd thinks the filesystem is already unmounted (it
isn't listed in /etc/mtab, and amd doesn't know about /proc/mounts),
so it tries to get rid of the old mount point---but it can't, because
the filesystem is in fact still mounted, and busy.
I have found a way to recover from this: close all open files on the
mounted filesystem, making it suitable for unmounting, then umount it
by hand. This brings the system back into the state amd thinks it's in.
Since amd is kind of mission-critical to me (I may be able to use autofs,
but I also have OpenBSD boxes where amd is the obvious choice), I am
working on my own fix. Will forward it when it's ready.
There are two parts to this:
(1) amd shouldn't get confused in this way;
(2) the Linux port of amd could be made more robust by paying attention
to /proc/mounts when it exists (i.e., with the kernel-mode NFS server).
As far as I can tell, this is not a Debian-specific issue; I'm copying
the upstream maintainer.
Here is how the problem manifests itself in syslog messages:
Mar 7 01:15:48 hermes amd[31106]: Couldn't find how to unmount /amd/as/as_1/gel
ato
Mar 7 11:58:35 hermes amd[31942]: /amd/as/as_1/gelato: mount: Device or resourc
e busy
Mar 7 11:58:35 hermes amd[31942]: Couldn't find how to unmount /amd/as/as_1/gel
ato
Mar 7 11:58:35 hermes amd[31942]: extra umount required for /amd/as/as_1/gelato
Mar 7 11:58:35 hermes amd[31072]: /home/gelato: mount (amfs_auto_cont): Device
or resource busy
After recompiling with --enable-debug=yes and running "amq -D all":
Mar 9 13:53:24 hermes amd[30703]: Timing out automount points...
Mar 9 13:53:24 hermes amd[30703]: "/home/gelato" on /amd/as/as_1/gelato timed o
ut
Mar 9 13:53:24 hermes amd[30703]: unmount attempt backgrounded
Mar 9 13:53:24 hermes amd[30863]: backgrounded
Mar 9 13:53:24 hermes amd[30863]: Unmounting /amd/as/as_1/gelato (as:/as_1/gela
to)
Mar 9 13:53:24 hermes amd[30863]: Trying unmount(/amd/as/as_1/gelato)
Mar 9 13:53:24 hermes amd[30863]: /amd/as/as_1/gelato: unmount: Device or resou
rce busy
Mar 9 13:53:24 hermes amd[30863]: Finished unmount(/amd/as/as_1/gelato)
Mar 9 13:53:24 hermes amd[30863]: /amd/as/as_1/gelato: unmount: Device or resou
rce busy
Mar 9 13:53:24 hermes amd[30703]: Next mount timeout in 266s
This one hasn't misbehaved yet. The /etc/mtab entry,
as:/as_1/gelato /amd/as/as_1/gelato nfs rw,nosuid,utimeout=600,vers=3,proto=udp
0 0
is still in sync with the /proc/mounts view,
as:/as_1/gelato /amd/as/as_1/gelato nfs rw,nosuid,v3,addr=as 0 0
But I expect that it will, as soon as I take a ten-minute break.
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From: Tim Cutts <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
X-Katie: lisa $Revision: 1.30 $
Subject: Bug#89029: fixed in am-utils 6.1.1-1
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Source: am-utils
Source-Version: 6.1.1-1
We believe that the bug you reported is fixed in the latest version of
am-utils, which is due to be installed in the Debian FTP archive:
am-utils-doc_6.1.1-1_all.deb
to pool/main/a/am-utils/am-utils-doc_6.1.1-1_all.deb
am-utils_6.1.1-1.diff.gz
to pool/main/a/am-utils/am-utils_6.1.1-1.diff.gz
am-utils_6.1.1-1.dsc
to pool/main/a/am-utils/am-utils_6.1.1-1.dsc
am-utils_6.1.1-1_alpha.deb
to pool/main/a/am-utils/am-utils_6.1.1-1_alpha.deb
am-utils_6.1.1.orig.tar.gz
to pool/main/a/am-utils/am-utils_6.1.1.orig.tar.gz
libamu-dev_6.1.1-1_alpha.deb
to pool/main/a/am-utils/libamu-dev_6.1.1-1_alpha.deb
libamu4_6.1.1-1_alpha.deb
to pool/main/a/am-utils/libamu4_6.1.1-1_alpha.deb
A summary of the changes between this version and the previous one is
attached.
Thank you for reporting the bug, which will now be closed. If you
have further comments please address them to [EMAIL PROTECTED],
and the maintainer will reopen the bug report if appropriate.
Debian distribution maintenance software
pp.
Tim Cutts <[EMAIL PROTECTED]> (supplier of updated am-utils package)
(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing [EMAIL PROTECTED])
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Format: 1.7
Date: Thu, 1 Sep 2005 15:34:06 +0100
Source: am-utils
Binary: am-utils libamu-dev libamu4 am-utils-doc
Architecture: source all alpha
Version: 6.1.1-1
Distribution: unstable
Urgency: low
Maintainer: Tim Cutts <[EMAIL PROTECTED]>
Changed-By: Tim Cutts <[EMAIL PROTECTED]>
Description:
am-utils - automounter utilities from 4.4BSD (includes amd)
am-utils-doc - automounter utilities documentation
libamu-dev - Support library for amd the 4.4BSD automounter (development)
libamu4 - Support library for amd the 4.4BSD automounter (runtime)
Closes: 89029 248388 276559 318521
Changes:
am-utils (6.1.1-1) unstable; urgency=low
.
* New upstream version (Closes: #318521)
* Added ldap support (Closes: #276559)
* Cookbook modified to reflect the lack of extended regexps (Closes:
#248388)
* mtab / mounts discrepancies believed fixed upstream (Closes: #89029)
* Moved libamu.la into -dev package in accordance with policy section 10.2
Files:
69a74b47d26881e7d1a2a0fe1998b5eb 1010 net extra am-utils_6.1.1-1.dsc
d80262aff0f66cac815d963556526257 1871009 net extra am-utils_6.1.1.orig.tar.gz
64d06930103e2e9f571e6656553878dd 58053 net extra am-utils_6.1.1-1.diff.gz
c29394b1570130c37668437823ee37f0 647904 doc extra am-utils-doc_6.1.1-1_all.deb
2ec9bd0ff9ea49e9ca2c1a76ed4188ce 415314 net extra am-utils_6.1.1-1_alpha.deb
663bc2108f021618de61522b6648cef5 158954 libs extra libamu4_6.1.1-1_alpha.deb
cf5901c7006f7d07f546b0046955523c 59126 libdevel extra
libamu-dev_6.1.1-1_alpha.deb
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