从 Ubuntu 18.04 LTS 升级到 20.04 LTS 后，我无法再使用 SMB 共享。我尝试从头开始重新安装操作系统，但结果是一样的。
fstab这是文件的内容
//<REMOTE_IP>/satdata /home/store cifs credentials=/etc/password/******.txt,uid=d*****e,gid=f****g,nodfs,noserverino,vers=2.1 0 0
- 命令的输出
mount -a
Aug 9 10:36:25 server-name kernel: [ 491.645084] FS-Cache: Netfs 'cifs' registered for caching
Aug 9 10:36:25 server-name kernel: [ 491.656554] Key type cifs.spnego registered
Aug 9 10:36:25 server-name kernel: [ 491.656561] Key type cifs.idmap registered
Aug 9 10:36:25 server-name kernel: [ 491.657220] CIFS: Attempting to mount //<REMOTE_IP>/satdata
Aug 9 10:36:25 server-name kernel: [ 491.725987] CIFS VFS: \\<REMOTE_IP>\IPC$ DFS capability contradicts DFS flag
Aug 9 10:36:25 server-name kernel: [ 491.727233] CIFS VFS: \\<REMOTE_IP>\satdata DFS capability contradicts DFS flag
- 我能够看到正确连接的共享和共享中的文件：
~# df -h
Filesystem Size Used Avail Use% Mounted on
udev 481G 0 481G 0% /dev
tmpfs 97G 5.9M 97G 1% /run
[..cut output..]
//<REMOTE_IP>/satdata 8.5T 8.4T 168G 99% /home/store
~# ls -lha /home/store/
total 223M
drwxr-xr-x 2 ***** ***** 0 Aug 2 11:46 .
drwxr-xr-x 20 ***** ***** 4.0K Jun 24 09:57 ..
-rwxr-xr-x 1 ***** ***** 147M Jan 28 2021 Anim_BLUE_SHARK_125-180cm_F_2003-2018_North_Pacific_and_Atlantic__Feeding_100ms.gif
drwxr-xr-x 2 ***** ***** 0 Sep 1 2010 BATHYMETRY
- 我可以在共享上正常工作，但在随机时间（1 分钟、1 小时等）之后，此消息就会出现在
syslog。
Aug 9 11:41:00 server-name kernel: [ 4366.982643] INFO: task cifsd:4480 blocked for more than 120 seconds.
Aug 9 11:41:00 server-name kernel: [ 4366.982726] Not tainted 5.4.0-80-generic #90-Ubuntu
Aug 9 11:41:00 server-name kernel: [ 4366.982763] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Aug 9 11:41:00 server-name kernel: [ 4366.982812] cifsd D 0 4480 2 0x80004000
Aug 9 11:41:00 server-name kernel: [ 4366.982818] Call Trace:
Aug 9 11:41:00 server-name kernel: [ 4366.982843] __schedule+0x2e3/0x740
Aug 9 11:41:00 server-name kernel: [ 4366.982852] schedule+0x42/0xb0
Aug 9 11:41:00 server-name kernel: [ 4366.982856] schedule_preempt_disabled+0xe/0x10
Aug 9 11:41:00 server-name kernel: [ 4366.982861] __mutex_lock.isra.0+0x178/0x4d0
Aug 9 11:41:00 server-name kernel: [ 4366.982876] ? release_sock+0x8f/0xa0
Aug 9 11:41:00 server-name kernel: [ 4366.982879] __mutex_lock_slowpath+0x13/0x20
Aug 9 11:41:00 server-name kernel: [ 4366.982882] mutex_lock+0x2e/0x40
Aug 9 11:41:00 server-name kernel: [ 4366.983193] dfs_cache_update_vol+0x41/0x2b0 [cifs]
Aug 9 11:41:00 server-name kernel: [ 4366.983271] cifs_reconnect+0x623/0xdb0 [cifs]
Aug 9 11:41:00 server-name kernel: [ 4366.983314] cifs_handle_standard+0x18e/0x1b0 [cifs]
Aug 9 11:41:00 server-name kernel: [ 4366.983357] cifs_demultiplex_thread+0xb05/0xcd0 [cifs]
Aug 9 11:41:00 server-name kernel: [ 4366.983363] ? __schedule+0x2eb/0x740
Aug 9 11:41:00 server-name kernel: [ 4366.983379] kthread+0x104/0x140
Aug 9 11:41:00 server-name kernel: [ 4366.983429] ? cifs_handle_standard+0x1b0/0x1b0 [cifs]
Aug 9 11:41:00 server-name kernel: [ 4366.983432] ? kthread_park+0x90/0x90
Aug 9 11:41:00 server-name kernel: [ 4366.983436] ret_from_fork+0x35/0x40
Aug 9 11:43:01 server-name kernel: [ 4487.811684] INFO: task kworker/137:2:1924 blocked for more than 120 seconds.
Aug 9 11:43:01 server-name kernel: [ 4487.811764] Not tainted 5.4.0-80-generic #90-Ubuntu
Aug 9 11:43:01 server-name kernel: [ 4487.811807] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Aug 9 11:43:01 server-name kernel: [ 4487.811859] kworker/137:2 D 0 1924 2 0x80004000
Aug 9 11:43:01 server-name kernel: [ 4487.812373] Workqueue: cifsiod smb2_reconnect_server [cifs]
Aug 9 11:43:01 server-name kernel: [ 4487.812377] Call Trace:
Aug 9 11:43:01 server-name kernel: [ 4487.812409] __schedule+0x2e3/0x740
Aug 9 11:43:01 server-name kernel: [ 4487.812436] ? mempool_alloc_slab+0x17/0x20
Aug 9 11:43:01 server-name kernel: [ 4487.812440] schedule+0x42/0xb0
Aug 9 11:43:01 server-name kernel: [ 4487.812445] schedule_preempt_disabled+0xe/0x10
Aug 9 11:43:01 server-name kernel: [ 4487.812454] __mutex_lock.isra.0+0x178/0x4d0
Aug 9 11:43:01 server-name kernel: [ 4487.812460] __mutex_lock_slowpath+0x13/0x20
Aug 9 11:43:01 server-name kernel: [ 4487.812463] mutex_lock+0x2e/0x40
Aug 9 11:43:01 server-name kernel: [ 4487.812655] smb2_reconnect.part.0+0xdf/0x4f0 [cifs]
Aug 9 11:43:01 server-name kernel: [ 4487.812672] ? __internal_add_timer+0x2d/0x40
Aug 9 11:43:01 server-name kernel: [ 4487.812725] smb2_reconnect_server+0x16e/0x2c0 [cifs]
Aug 9 11:43:01 server-name kernel: [ 4487.812751] process_one_work+0x1eb/0x3b0
Aug 9 11:43:01 server-name kernel: [ 4487.812755] worker_thread+0x4d/0x400
Aug 9 11:43:01 server-name kernel: [ 4487.812769] kthread+0x104/0x140
Aug 9 11:43:01 server-name kernel: [ 4487.812773] ? process_one_work+0x3b0/0x3b0
Aug 9 11:43:01 server-name kernel: [ 4487.812775] ? kthread_park+0x90/0x90
Aug 9 11:43:01 server-name kernel: [ 4487.812779] ret_from_fork+0x35/0x40
Aug 9 11:43:01 server-name kernel: [ 4487.812981] INFO: task cifsd:4480 blocked for more than 241 seconds.
Aug 9 11:43:01 server-name kernel: [ 4487.813038] Not tainted 5.4.0-80-generic #90-Ubuntu
Aug 9 11:43:01 server-name kernel: [ 4487.813076] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Aug 9 11:43:01 server-name kernel: [ 4487.813130] cifsd D 0 4480 2 0x80004000
Aug 9 11:43:01 server-name kernel: [ 4487.813134] Call Trace:
Aug 9 11:43:01 server-name kernel: [ 4487.813143] __schedule+0x2e3/0x740
Aug 9 11:43:01 server-name kernel: [ 4487.813149] schedule+0x42/0xb0
Aug 9 11:43:01 server-name kernel: [ 4487.813153] schedule_preempt_disabled+0xe/0x10
Aug 9 11:43:01 server-name kernel: [ 4487.813157] __mutex_lock.isra.0+0x178/0x4d0
Aug 9 11:43:01 server-name kernel: [ 4487.813176] ? release_sock+0x8f/0xa0
Aug 9 11:43:01 server-name kernel: [ 4487.813181] __mutex_lock_slowpath+0x13/0x20
Aug 9 11:43:01 server-name kernel: [ 4487.813185] mutex_lock+0x2e/0x40
Aug 9 11:43:01 server-name kernel: [ 4487.813278] dfs_cache_update_vol+0x41/0x2b0 [cifs]
Aug 9 11:43:01 server-name kernel: [ 4487.813362] cifs_reconnect+0x623/0xdb0 [cifs]
Aug 9 11:43:01 server-name kernel: [ 4487.813448] cifs_handle_standard+0x18e/0x1b0 [cifs]
Aug 9 11:43:01 server-name kernel: [ 4487.813535] cifs_demultiplex_thread+0xb05/0xcd0 [cifs]
Aug 9 11:43:01 server-name kernel: [ 4487.813541] ? __schedule+0x2eb/0x740
Aug 9 11:43:01 server-name kernel: [ 4487.813548] kthread+0x104/0x140
Aug 9 11:43:01 server-name kernel: [ 4487.813595] ? cifs_handle_standard+0x1b0/0x1b0 [cifs]
Aug 9 11:43:01 server-name kernel: [ 4487.813598] ? kthread_park+0x90/0x90
Aug 9 11:43:01 server-name kernel: [ 4487.813602] ret_from_fork+0x35/0x40
收到该消息后，我无法查看共享内容或运行简单df -h命令。重新访问共享的唯一方法是重新启动服务器。
- 附加信息：
Linux server-name 5.4.0-80-generic #90-Ubuntu SMP Fri Jul 9 22:49:44 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
# dpkg -l | grep cifs
ii cifs-utils 2:6.9-1ubuntu0.1 amd64
Common Internet File System utilities
您能帮助我了解如何修复该错误吗？
非常感谢
答案1
我有三台服务器受到同一问题的困扰（Ubuntu 20.04，内核 5.4.0-xx）。因为这个问题不会发生在 Ubuntu 18.04（内核 4.15.0-xxx）或 Ubuntu 21.04（内核 5.11.0-xx）上。我决定将我的 Ubuntu 20.04 服务器切换到内核 5.11.0-xx，这解决了我的服务器的问题。