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[Ulf Rompe <launchpad.net@xxxxxxxxx>]

That worked out well. I have added these jobs to my crontab:

*/1 * * * * /bin/ls >/dev/null
*/2 * * * * /bin/ls >/dev/null

Therefore every two minutes both jobs are run, while every other minute only one of them gets started.
Output from monitor_private_dir.sh since then:

Mai 19 11:44:27 ~/Private was unmounted.
Mai 19 12:28:27 ~/Private was unmounted.
Mai 19 12:32:27 ~/Private was unmounted.
Mai 19 12:33:27 ~/Private was unmounted.
Mai 19 12:36:27 ~/Private was unmounted.
Mai 19 12:42:27 ~/Private was unmounted.
Mai 19 12:46:27 ~/Private was unmounted.
Mai 19 12:52:27 ~/Private was unmounted.
Mai 19 12:54:27 ~/Private was unmounted.
Mai 19 13:00:27 ~/Private was unmounted.

At 12:33 another regular cronjob was running, so that uneven hit doesn't
count. Every other hit proves the theory that two arbitrary cronjobs
have to have the same start time to raise the chances of provoking the
unmount of ~/Private.

Are you able reproduce the bug with this test case (adding the two lines
to your crontab and interactively running my script)?

-- 
ecryptfs private directory randomly unmounts
https://bugs.launchpad.net/bugs/358573
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Status in eCryptfs - Enterprise Cryptographic Filesystem: Confirmed
Status in “ecryptfs-utils” source package in Ubuntu: Confirmed

Bug description:
Binary package hint: ecryptfs-utils

This seems to be bug #259293, but I am filing a new one as I haven't seen this in some time. Twice in the last week my ~/Private directory unmounted. Both times /tmp/ecryptfs-<user>-Private was '0'. Both times, the symlink in the unmounted ~/Private was not present.  I have a cron job that runs every 10 minutes that I can see in syslog:

Apr  9 11:15:04 hostname CRON[22771]: Mount of private directory return code [0]

It could be that bug #259293 is simply 'mostly' fixed and I coincidentally hit this twice in the last week, or it could be a new bug (I don't know).

ProblemType: Bug
Architecture: amd64
DistroRelease: Ubuntu 9.04
Package: ecryptfs-utils 73-0ubuntu2
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ecryptfs-utils
Uname: Linux 2.6.28-11-generic x86_64