一周前，我的主分区（使用 ecryptfs 加密，在安装过程中设置）已满。我删除了一些文件，所以现在又有足够的空间了。但不知何故，ecryptfs 文件系统随机卸载。
如果发生这种情况，我只需运行ecryptfs-mount-private，输入我的密码，一段时间后一切都会恢复正常，但随后它会再次卸载。
知道那里可能存在什么问题以及如何修复吗？
以下是/var/log/syslog问题发生的时间范围内的线路：
Aug 26 16:35:01 jost-desktop CRON[3070]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
Aug 26 16:38:58 jost-desktop systemd[1]: Started CUPS Scheduler.
Aug 26 16:38:58 jost-desktop colord[1378]: (colord:1378): Cd-WARNING **: failed to get session [pid 3135]: No such device or address
Aug 26 16:38:58 jost-desktop colord[1378]: message repeated 2 times: [ (colord:1378): Cd-WARNING **: failed to get session [pid 3135]: No such device or address]
Aug 26 16:39:01 jost-desktop CRON[3146]: (root) CMD ( [ -x /usr/lib/php5/sessionclean ] && /usr/lib/php5/sessionclean)
Aug 26 16:41:13 jost-desktop systemd[1]: Starting Cleanup of Temporary Directories...
Aug 26 16:41:13 jost-desktop systemd-tmpfiles[3185]: [/usr/lib/tmpfiles.d/var.conf:14] Duplicate line for path "/var/log", ignoring.
Aug 26 16:41:14 jost-desktop systemd[1]: Started Cleanup of Temporary Directories.
Aug 26 16:45:01 jost-desktop CRON[3232]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
Aug 26 16:51:58 jost-desktop systemd[1]: Started CUPS Scheduler.
Aug 26 16:51:58 jost-desktop colord[1378]: (colord:1378): Cd-WARNING **: failed to get session [pid 3301]: No such device or address
Aug 26 16:51:58 jost-desktop colord[1378]: message repeated 2 times: [ (colord:1378): Cd-WARNING **: failed to get session [pid 3301]: No such device or address]
Aug 26 16:55:01 jost-desktop CRON[3317]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
没有任何相关内容dmesg（最后一项来自启动过程）。
更新：我还检查了所有磁盘的 SMART 状态，似乎没有任何问题。输出来自smartctl -a /dev/sdb：
=== START OF INFORMATION SECTION ===
Model Family: Seagate Barracuda 7200.14 (AF)
Device Model: ST1000DM003-1CH162
Serial Number: S1D8W76M
LU WWN Device Id: 5 000c50 05c382341
Firmware Version: CC46
User Capacity: 1.000.204.886.016 bytes [1,00 TB]
Sector Sizes: 512 bytes logical, 4096 bytes physical
Rotation Rate: 7200 rpm
Form Factor: 3.5 inches
Device is: In smartctl database [for details use: -P show]
ATA Version is: ATA8-ACS T13/1699-D revision 4
SATA Version is: SATA 3.0, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is: Thu Sep 14 22:43:53 2017 CEST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED
General SMART Values:
Offline data collection status: (0x82) Offline data collection activity
was completed without error.
Auto Offline Data Collection: Enabled.
Self-test execution status: ( 0) The previous self-test routine completed
without error or no self-test has ever
been run.
Total time to complete Offline
data collection: ( 575) seconds.
Offline data collection
capabilities: (0x7b) SMART execute Offline immediate.
Auto Offline data collection on/off support.
Suspend Offline collection upon new
command.
Offline surface scan supported.
Self-test supported.
Conveyance Self-test supported.
Selective Self-test supported.
SMART capabilities: (0x0003) Saves SMART data before entering
power-saving mode.
Supports SMART auto save timer.
Error logging capability: (0x01) Error logging supported.
General Purpose Logging supported.
Short self-test routine
recommended polling time: ( 1) minutes.
Extended self-test routine
recommended polling time: ( 108) minutes.
Conveyance self-test routine
recommended polling time: ( 2) minutes.
SCT capabilities: (0x3085) SCT Status supported.
SMART Attributes Data Structure revision number: 10
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE
1 Raw_Read_Error_Rate 0x000f 119 099 006 Pre-fail Always - 234006864
3 Spin_Up_Time 0x0003 097 097 000 Pre-fail Always - 0
4 Start_Stop_Count 0x0032 098 098 020 Old_age Always - 2479
5 Reallocated_Sector_Ct 0x0033 100 100 010 Pre-fail Always - 0
7 Seek_Error_Rate 0x000f 084 060 030 Pre-fail Always - 4621305762
9 Power_On_Hours 0x0032 081 081 000 Old_age Always - 16848
10 Spin_Retry_Count 0x0013 100 100 097 Pre-fail Always - 0
12 Power_Cycle_Count 0x0032 098 098 020 Old_age Always - 2506
183 Runtime_Bad_Block 0x0032 100 100 000 Old_age Always - 0
184 End-to-End_Error 0x0032 100 100 099 Old_age Always - 0
187 Reported_Uncorrect 0x0032 100 100 000 Old_age Always - 0
188 Command_Timeout 0x0032 100 098 000 Old_age Always - 6 7 20
189 High_Fly_Writes 0x003a 098 098 000 Old_age Always - 2
190 Airflow_Temperature_Cel 0x0022 065 049 045 Old_age Always - 35 (Min/Max 16/36)
191 G-Sense_Error_Rate 0x0032 100 100 000 Old_age Always - 0
192 Power-Off_Retract_Count 0x0032 100 100 000 Old_age Always - 216
193 Load_Cycle_Count 0x0032 099 099 000 Old_age Always - 3086
194 Temperature_Celsius 0x0022 035 051 000 Old_age Always - 35 (0 5 0 0 0)
197 Current_Pending_Sector 0x0012 100 100 000 Old_age Always - 0
198 Offline_Uncorrectable 0x0010 100 100 000 Old_age Offline - 0
199 UDMA_CRC_Error_Count 0x003e 200 200 000 Old_age Always - 30
240 Head_Flying_Hours 0x0000 100 253 000 Old_age Offline - 16941h+00m+06.008s
241 Total_LBAs_Written 0x0000 100 253 000 Old_age Offline - 51949642453
242 Total_LBAs_Read 0x0000 100 253 000 Old_age Offline - 40959708870
SMART Error Log Version: 1
No Errors Logged
SMART Self-test log structure revision number 1
Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error
# 1 Short offline Completed without error 00% 82 -
# 2 Short offline Completed without error 00% 17 -
# 3 Short offline Completed without error 00% 9 -
SMART Selective self-test log data structure revision number 1
SPAN MIN_LBA MAX_LBA CURRENT_TEST_STATUS
1 0 0 Not_testing
2 0 0 Not_testing
3 0 0 Not_testing
4 0 0 Not_testing
5 0 0 Not_testing
Selective self-test flags (0x0):
After scanning selected spans, do NOT read-scan remainder of disk.
If Selective self-test is pending on power-up, resume after 0 minute delay.