Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.0 kernel[0].
If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'. If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'. If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'. Once testing of the upstream kernel is complete, please mark this bug as "Confirmed". Thanks in advance. [0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.0-rc2-vivid/ ** Changed in: linux (Ubuntu) Importance: Undecided => Medium ** Tags added: kernel-da-key ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1428045/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
