Hi,
A auto mounted directory won't be automatically unmounted after a
system date/time change, for example we can reproduce the issue with
below steps in 100% failrate:
$ cat /etc/auto.master
/mnt /etc/auto.misc
$ cat /etc/auto.misc
removable -fstype=auto :/dev/sdb1
### now plugin a usb pendrive
$ cd /mnt/removable
$ sudo date -s "+1 year"
$ sleep 1
$ sudo date -s "-1 year"
$ cd
Now /mnt/removable will not be automatically unmounted, the root cause
is that autofs uses gettimeofday() to identify the timestamp and
calculate the delta for timeouts, however as mentioned in the manpage:
```
NOTES
The time returned by gettimeofday() is affected by discontinuous jumps
in the system time (e.g., if the system administrator manually changes
the system time). If you need a monotonically increasing clock, see
clock_gettime(2).
```
So in the above reproducer autofs will wait for a one-year-long
timeout to unmount /mnt/removable.
BR
Ning
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