[Bug 483159] [NEW] pam_mount trying to unmount my auto-mounted encrypted partitions every hour via CRON

[Ari]

Public bug reported:

Binary package hint: libpam-mount

Since I upgraded to Karmic, I noticed the weird fact that my two auto-
mounted LUKS-encrypted partitions randomly seemed to disappear from mtab
- I had to manually mount them again to use them. I've been using them
for several years with all ubuntus so far, never had a problem until
now.


These partitions are automatically mounted on login via pam_mount. These are the entries in pam_mount.conf.xml:

<volume fstype="crypt" path="/dev/sda3" mountpoint="/media/sda3" options="cipher=aes" />
<volume fstype="crypt" path="/dev/sda5" mountpoint="/media/sda5" options="cipher=aes" />


After digging in the logs, I've found that there is some sort of a cron job trying to unmount my two partitions and running every 60 minutes. If the partitions are busy then they survive; if they are not busy, then they are umounted (very weird !!!!!) 

>From my auth.log I see this every hour:

Nov 15 11:17:01 nahuatl CRON[1230]: pam_unix(cron:session): session opened for user root by (uid=0)
Nov 15 11:17:01 nahuatl CRON[1230]: pam_mount(pam_mount.c:516): warning: could not obtain password interactively either
Nov 15 11:17:01 nahuatl CRON[1230]: pam_unix(cron:session): session closed for user root
Nov 15 11:17:01 nahuatl CRON[1230]: pam_mount(mount.c:67): umount messages:
Nov 15 11:17:01 nahuatl CRON[1230]: pam_mount(mount.c:71): umount: /media/sda5: device is busy.
Nov 15 11:17:01 nahuatl CRON[1230]: pam_mount(mount.c:71):         (In some cases useful info about processes that use
Nov 15 11:17:01 nahuatl CRON[1230]: pam_mount(mount.c:71):          the device is found by lsof(8) or fuser(1))
Nov 15 11:17:01 nahuatl CRON[1230]: pam_mount(mount.c:71): umount /media/sda5 failed with run_sync status 1
Nov 15 11:17:01 nahuatl CRON[1230]: pam_mount(mount.c:71): Command failed: Device busy
Nov 15 11:17:01 nahuatl CRON[1230]: pam_mount(mount.c:71): umount.crypt(crypto-dmc.c:168): Could not unload dm-crypt device "/dev/mapper/_dev_sda5", cryptsetup returned HXproc status 240
Nov 15 11:17:01 nahuatl CRON[1230]: pam_mount(mount.c:698): unmount of /dev/sda5 failed
Nov 15 11:17:01 nahuatl CRON[1230]: pam_mount(mount.c:67): umount messages:
Nov 15 11:17:01 nahuatl CRON[1230]: pam_mount(mount.c:71): umount: /media/sda3: device is busy.
Nov 15 11:17:01 nahuatl CRON[1230]: pam_mount(mount.c:71):         (In some cases useful info about processes that use
Nov 15 11:17:01 nahuatl CRON[1230]: pam_mount(mount.c:71):          the device is found by lsof(8) or fuser(1))
Nov 15 11:17:01 nahuatl CRON[1230]: pam_mount(mount.c:71): umount /media/sda3 failed with run_sync status 1
Nov 15 11:17:01 nahuatl CRON[1230]: pam_mount(mount.c:71): Command failed: Device busy
Nov 15 11:17:01 nahuatl CRON[1230]: pam_mount(mount.c:71): umount.crypt(crypto-dmc.c:168): Could not unload dm-crypt device "/dev/mapper/_dev_sda3", cryptsetup returned HXproc status 240
Nov 15 11:17:01 nahuatl CRON[1230]: pam_mount(mount.c:698): unmount of /dev/sda3 failed


In my view this is a major bug. 

A hint or workaround on how to stop this CRON thing from trying to
unmount my drives would be greatly appreciated.

I've found only this similar reference:

http://groups.google.com/group/linux.debian.user.german/browse_thread/thread/1c632245a397f7c9?utoken
=JRGmfjsAAAD-4m7bW_nhUf_RRJzb_a9w_ObWXSwL4IOKiU8782Hmp-
EH8COufF2SlzXILlU-DjyKjuOEmBHIEfBNJAzzPaif

seems to hint that the problem was introduced recently in debian, in
libpam_mount 1.27-4

** Affects: libpam-mount (Ubuntu)
     Importance: Undecided
         Status: New

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pam_mount trying to unmount my auto-mounted encrypted partitions every hour via CRON
https://bugs.launchpad.net/bugs/483159
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