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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1428045

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1428045

Title:
  CIFS hangs at cifs_oplock_break

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  we're having constant issues with CIFS mounts on our Linux terminal
  servers (Ubuntu 12.04 and 14.04 with updated kernel). Usually after 1
  or 2 days we see the following in dmesg:

  
  [102000.440031] INFO: task cifsiod:2184 blocked for more than 120 seconds.
  [102000.441342]       Not tainted 3.19.0-7-generic #7-Ubuntu
  [102000.441454] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  [102000.441617] cifsiod         D ffff8800363dfc98     0  2184      2 0x00000000
  [102000.441796] Workqueue: cifsiod cifs_oplock_break [cifs]
  [102000.442048]  ffff8800363dfc98 ffff8800368b09d0 0000000000014200 ffff8800363dffd8
  [102000.442215]  0000000000014200 ffff88013ab9bae0 ffff8800368b09d0 0000000000000246
  [102000.442382]  ffff8800363dfd30 ffff88013ffd7c88 0000000000000002 ffffffff817cb120
  [102000.442628] Call Trace:
  [102000.442681]  [<ffffffff817cb120>] ? bit_wait_io+0x50/0x50
  [102000.442828]  [<ffffffff817ca4c9>] schedule+0x29/0x70
  [102000.442926]  [<ffffffff817cb14b>] bit_wait+0x2b/0x50
  [102000.443023]  [<ffffffff817caca7>] __wait_on_bit+0x67/0x90
  [102000.443128]  [<ffffffff810a2857>] ? wake_up_process+0x27/0x50
  [102000.443240]  [<ffffffff817cb120>] ? bit_wait_io+0x50/0x50
  [102000.443345]  [<ffffffff817cad42>] out_of_line_wait_on_bit+0x72/0x80
  [102000.443466]  [<ffffffff810b6f70>] ? autoremove_wake_function+0x40/0x40
  [102000.443736]  [<ffffffffc037689b>] cifs_oplock_break+0x6b/0x330 [cifs]
  [102000.443994]  [<ffffffff8108f218>] process_one_work+0x158/0x460
  [102000.444250]  [<ffffffff8108f6ac>] rescuer_thread+0x18c/0x460
  [102000.444495]  [<ffffffff8108f520>] ? process_one_work+0x460/0x460
  [102000.444745]  [<ffffffff810950e9>] kthread+0xc9/0xe0
  [102000.444975]  [<ffffffff81095020>] ? kthread_create_on_node+0x1c0/0x1c0
  [102000.445234]  [<ffffffff817cf2bc>] ret_from_fork+0x7c/0xb0
  [102000.445472]  [<ffffffff81095020>] ? kthread_create_on_node+0x1c0/0x1c0

  
  and later

  
  [102000.445739] INFO: task kworker/3:2:20985 blocked for more than 120 seconds.
  [102000.446004]       Not tainted 3.19.0-7-generic #7-Ubuntu
  [102000.446239] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  [102000.446657] kworker/3:2     D ffff8800bae87cb8     0 20985      2 0x00000000
  [102000.446949] Workqueue: cifsiod cifs_oplock_break [cifs]
  [102000.447187]  ffff8800bae87cb8 ffff8800baed9d70 0000000000014200 ffff8800bae87fd8
  [102000.447613]  0000000000014200 ffff88013abf44b0 ffff8800baed9d70 0000000000000246
  [102000.448047]  ffff8800bae87d50 ffff88013ffd7c88 0000000000000002 ffffffff817cb120
  [102000.448477] Call Trace:
  [102000.448659]  [<ffffffff817cb120>] ? bit_wait_io+0x50/0x50
  [102000.448896]  [<ffffffff817ca4c9>] schedule+0x29/0x70
  [102000.449127]  [<ffffffff817cb14b>] bit_wait+0x2b/0x50
  [102000.449360]  [<ffffffff817caca7>] __wait_on_bit+0x67/0x90
  [102000.449595]  [<ffffffff817cb120>] ? bit_wait_io+0x50/0x50
  [102000.449834]  [<ffffffff817cad42>] out_of_line_wait_on_bit+0x72/0x80
  [102000.450085]  [<ffffffff810b6f70>] ? autoremove_wake_function+0x40/0x40
  [102000.450361]  [<ffffffffc037689b>] cifs_oplock_break+0x6b/0x330 [cifs]
  [102000.450631]  [<ffffffff8108f218>] process_one_work+0x158/0x460
  [102000.450907]  [<ffffffff8108fef3>] worker_thread+0x53/0x5a0
  [102000.451163]  [<ffffffff8108fea0>] ? idle_worker_timeout+0x110/0x110
  [102000.451834]  [<ffffffff810950e9>] kthread+0xc9/0xe0
  [102000.452093]  [<ffffffff81095020>] ? kthread_create_on_node+0x1c0/0x1c0
  [102000.452357]  [<ffffffff817cf2bc>] ret_from_fork+0x7c/0xb0
  [102000.452601]  [<ffffffff81095020>] ? kthread_create_on_node+0x1c0/0x1c0

  
  The same repeats for various other processes like kworker and the hanging userspace process. This happens with all recent kernel versions (3.13-3.19) and forces us to reboot the server regularly as the requesting processes always hang with process state "D" and (I/O) load increases from day to day. Further information:

  Mount options:
  sec=krb5,multiuser,mfsymlinks,dir_mode=0700,file_mode=0700,nomapposix,noserverino,nobrl

  CIFS server: Samba 4.1.17 with default configuration

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