Ubuntu 14.04 hangs intermittently under Hyper-V











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I have Ubuntu Server 14.04.1 LTS running in a Hyper-V virtual machine on a Windows 2012 R2 host.



After running for some time, the Ubuntu server seems to freeze up (at least partially). A website it's hosting under nginx stops working. I can connect via Putty and enter my username and password, but then the session immediately hangs:



Login hangs



The same thing happens when I try to log in from the console (making it difficult to check logs / troubleshoot). However I do notice output like this sitting in the console window:



Console window



If there is a local or remote console session that is already logged in, I can still interact with it. However any attempt to write to the disk freezes the session.



I managed to snag a dmesg dump and recent content of kernel.log. And here's an earlier, partial dmesg screencap in case it is of use.



I believe the issue may be related to the disk I/O stack:



[16209.927138] hv_storvsc vmbus_0_13: cmd 0x35 scsi status 0x2 srb status 0x82
[16209.927142] hv_storvsc vmbus_0_13: stor pkt ffff88003b203100 autosense data valid - len 18
[16209.927144] storvsc: Sense Key : Unit Attention [current]
[16209.927146] storvsc: Add. Sense: Changed operating definition
[16209.927151] sd 0:0:0:0: Warning! Received an indication that the operating parameters on this target have changed. The Linux SCSI layer does not automatically adjust these parameters.
[45841.680551] INFO: task rs:main Q:Reg:882 blocked for more than 120 seconds.
[45841.680580] Not tainted 3.13.0-32-generic #57-Ubuntu
[45841.680596] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.


The install is fairly fresh and default settings were accepted for pretty much everything. The VM is using Hyper-V's "generation 2" guest architecture, with secure boot disabled.



My symptoms seem similar to those reported here, here and here, but those threads are a few years old and refer to older versions of guest & host.



The server still responds to pings. Also note we saw the freezing behavior before nginx was installed.



I don't think it's a resource issue. The VM has 1GB of RAM and plenty of disk space. Here's what things look like before it freezes:



  System information as of Sun Aug  3 16:03:30 EDT 2014

System load: 0.08 Processes: 231
Usage of /: 3.6% of 96.59GB Users logged in: 1
Memory usage: 29% IP address for eth0: 172.22.0.26
Swap usage: 0%


I'm looking for:




  1. Tips on how to efficiently troubleshoot this


  2. Instructions on how to turn off any sort of disk-related features (e.g. power saving) that came out of the box in my Ubuntu install.


  3. A recommendation on where to find a Linux + Hyper-V genius we can hire remotely to help sort this out (and maybe other occasional Linux work)











share|improve this question




























    up vote
    4
    down vote

    favorite
    4












    I have Ubuntu Server 14.04.1 LTS running in a Hyper-V virtual machine on a Windows 2012 R2 host.



    After running for some time, the Ubuntu server seems to freeze up (at least partially). A website it's hosting under nginx stops working. I can connect via Putty and enter my username and password, but then the session immediately hangs:



    Login hangs



    The same thing happens when I try to log in from the console (making it difficult to check logs / troubleshoot). However I do notice output like this sitting in the console window:



    Console window



    If there is a local or remote console session that is already logged in, I can still interact with it. However any attempt to write to the disk freezes the session.



    I managed to snag a dmesg dump and recent content of kernel.log. And here's an earlier, partial dmesg screencap in case it is of use.



    I believe the issue may be related to the disk I/O stack:



    [16209.927138] hv_storvsc vmbus_0_13: cmd 0x35 scsi status 0x2 srb status 0x82
    [16209.927142] hv_storvsc vmbus_0_13: stor pkt ffff88003b203100 autosense data valid - len 18
    [16209.927144] storvsc: Sense Key : Unit Attention [current]
    [16209.927146] storvsc: Add. Sense: Changed operating definition
    [16209.927151] sd 0:0:0:0: Warning! Received an indication that the operating parameters on this target have changed. The Linux SCSI layer does not automatically adjust these parameters.
    [45841.680551] INFO: task rs:main Q:Reg:882 blocked for more than 120 seconds.
    [45841.680580] Not tainted 3.13.0-32-generic #57-Ubuntu
    [45841.680596] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.


    The install is fairly fresh and default settings were accepted for pretty much everything. The VM is using Hyper-V's "generation 2" guest architecture, with secure boot disabled.



    My symptoms seem similar to those reported here, here and here, but those threads are a few years old and refer to older versions of guest & host.



    The server still responds to pings. Also note we saw the freezing behavior before nginx was installed.



    I don't think it's a resource issue. The VM has 1GB of RAM and plenty of disk space. Here's what things look like before it freezes:



      System information as of Sun Aug  3 16:03:30 EDT 2014

    System load: 0.08 Processes: 231
    Usage of /: 3.6% of 96.59GB Users logged in: 1
    Memory usage: 29% IP address for eth0: 172.22.0.26
    Swap usage: 0%


    I'm looking for:




    1. Tips on how to efficiently troubleshoot this


    2. Instructions on how to turn off any sort of disk-related features (e.g. power saving) that came out of the box in my Ubuntu install.


    3. A recommendation on where to find a Linux + Hyper-V genius we can hire remotely to help sort this out (and maybe other occasional Linux work)











    share|improve this question


























      up vote
      4
      down vote

      favorite
      4









      up vote
      4
      down vote

      favorite
      4






      4





      I have Ubuntu Server 14.04.1 LTS running in a Hyper-V virtual machine on a Windows 2012 R2 host.



      After running for some time, the Ubuntu server seems to freeze up (at least partially). A website it's hosting under nginx stops working. I can connect via Putty and enter my username and password, but then the session immediately hangs:



      Login hangs



      The same thing happens when I try to log in from the console (making it difficult to check logs / troubleshoot). However I do notice output like this sitting in the console window:



      Console window



      If there is a local or remote console session that is already logged in, I can still interact with it. However any attempt to write to the disk freezes the session.



      I managed to snag a dmesg dump and recent content of kernel.log. And here's an earlier, partial dmesg screencap in case it is of use.



      I believe the issue may be related to the disk I/O stack:



      [16209.927138] hv_storvsc vmbus_0_13: cmd 0x35 scsi status 0x2 srb status 0x82
      [16209.927142] hv_storvsc vmbus_0_13: stor pkt ffff88003b203100 autosense data valid - len 18
      [16209.927144] storvsc: Sense Key : Unit Attention [current]
      [16209.927146] storvsc: Add. Sense: Changed operating definition
      [16209.927151] sd 0:0:0:0: Warning! Received an indication that the operating parameters on this target have changed. The Linux SCSI layer does not automatically adjust these parameters.
      [45841.680551] INFO: task rs:main Q:Reg:882 blocked for more than 120 seconds.
      [45841.680580] Not tainted 3.13.0-32-generic #57-Ubuntu
      [45841.680596] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.


      The install is fairly fresh and default settings were accepted for pretty much everything. The VM is using Hyper-V's "generation 2" guest architecture, with secure boot disabled.



      My symptoms seem similar to those reported here, here and here, but those threads are a few years old and refer to older versions of guest & host.



      The server still responds to pings. Also note we saw the freezing behavior before nginx was installed.



      I don't think it's a resource issue. The VM has 1GB of RAM and plenty of disk space. Here's what things look like before it freezes:



        System information as of Sun Aug  3 16:03:30 EDT 2014

      System load: 0.08 Processes: 231
      Usage of /: 3.6% of 96.59GB Users logged in: 1
      Memory usage: 29% IP address for eth0: 172.22.0.26
      Swap usage: 0%


      I'm looking for:




      1. Tips on how to efficiently troubleshoot this


      2. Instructions on how to turn off any sort of disk-related features (e.g. power saving) that came out of the box in my Ubuntu install.


      3. A recommendation on where to find a Linux + Hyper-V genius we can hire remotely to help sort this out (and maybe other occasional Linux work)











      share|improve this question















      I have Ubuntu Server 14.04.1 LTS running in a Hyper-V virtual machine on a Windows 2012 R2 host.



      After running for some time, the Ubuntu server seems to freeze up (at least partially). A website it's hosting under nginx stops working. I can connect via Putty and enter my username and password, but then the session immediately hangs:



      Login hangs



      The same thing happens when I try to log in from the console (making it difficult to check logs / troubleshoot). However I do notice output like this sitting in the console window:



      Console window



      If there is a local or remote console session that is already logged in, I can still interact with it. However any attempt to write to the disk freezes the session.



      I managed to snag a dmesg dump and recent content of kernel.log. And here's an earlier, partial dmesg screencap in case it is of use.



      I believe the issue may be related to the disk I/O stack:



      [16209.927138] hv_storvsc vmbus_0_13: cmd 0x35 scsi status 0x2 srb status 0x82
      [16209.927142] hv_storvsc vmbus_0_13: stor pkt ffff88003b203100 autosense data valid - len 18
      [16209.927144] storvsc: Sense Key : Unit Attention [current]
      [16209.927146] storvsc: Add. Sense: Changed operating definition
      [16209.927151] sd 0:0:0:0: Warning! Received an indication that the operating parameters on this target have changed. The Linux SCSI layer does not automatically adjust these parameters.
      [45841.680551] INFO: task rs:main Q:Reg:882 blocked for more than 120 seconds.
      [45841.680580] Not tainted 3.13.0-32-generic #57-Ubuntu
      [45841.680596] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.


      The install is fairly fresh and default settings were accepted for pretty much everything. The VM is using Hyper-V's "generation 2" guest architecture, with secure boot disabled.



      My symptoms seem similar to those reported here, here and here, but those threads are a few years old and refer to older versions of guest & host.



      The server still responds to pings. Also note we saw the freezing behavior before nginx was installed.



      I don't think it's a resource issue. The VM has 1GB of RAM and plenty of disk space. Here's what things look like before it freezes:



        System information as of Sun Aug  3 16:03:30 EDT 2014

      System load: 0.08 Processes: 231
      Usage of /: 3.6% of 96.59GB Users logged in: 1
      Memory usage: 29% IP address for eth0: 172.22.0.26
      Swap usage: 0%


      I'm looking for:




      1. Tips on how to efficiently troubleshoot this


      2. Instructions on how to turn off any sort of disk-related features (e.g. power saving) that came out of the box in my Ubuntu install.


      3. A recommendation on where to find a Linux + Hyper-V genius we can hire remotely to help sort this out (and maybe other occasional Linux work)








      ubuntu freeze hyper-v






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      share|improve this question













      share|improve this question




      share|improve this question








      edited Aug 5 '14 at 11:50

























      asked Aug 4 '14 at 6:49









      rkagerer

      138212




      138212






















          2 Answers
          2






          active

          oldest

          votes

















          up vote
          0
          down vote













          I found an info in the French Ubuntu forums from other user who has Ubuntu freezes: It may be caused by "dynamic tick".



          Their solution:



          cd /etc/default
          sudo vi grub


          add nohz=true in parameters of the line GRUB_CMDLINE_LINUX_DEFAULT. Then do a



          sudo grub-update





          share|improve this answer























          • Hi Dominique, I do not have Dynamic Memory enabled, so it's not likely that is causing the issue.
            – rkagerer
            Aug 13 '14 at 5:24












          • Please only post answers if you have a definitive solution. Also take care of formatting your posts properly, and note that this is not a forum, so you should always edit your existing post rather than posting another one.
            – slhck
            Aug 13 '14 at 13:24










          • ok I do not want to bore anyone, I'll get my solution elsewhere.
            – delete me
            Aug 13 '14 at 21:26


















          up vote
          0
          down vote













          I think I also have this problem – have you found this:
          https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1470250






          share|improve this answer





















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            up vote
            0
            down vote













            I found an info in the French Ubuntu forums from other user who has Ubuntu freezes: It may be caused by "dynamic tick".



            Their solution:



            cd /etc/default
            sudo vi grub


            add nohz=true in parameters of the line GRUB_CMDLINE_LINUX_DEFAULT. Then do a



            sudo grub-update





            share|improve this answer























            • Hi Dominique, I do not have Dynamic Memory enabled, so it's not likely that is causing the issue.
              – rkagerer
              Aug 13 '14 at 5:24












            • Please only post answers if you have a definitive solution. Also take care of formatting your posts properly, and note that this is not a forum, so you should always edit your existing post rather than posting another one.
              – slhck
              Aug 13 '14 at 13:24










            • ok I do not want to bore anyone, I'll get my solution elsewhere.
              – delete me
              Aug 13 '14 at 21:26















            up vote
            0
            down vote













            I found an info in the French Ubuntu forums from other user who has Ubuntu freezes: It may be caused by "dynamic tick".



            Their solution:



            cd /etc/default
            sudo vi grub


            add nohz=true in parameters of the line GRUB_CMDLINE_LINUX_DEFAULT. Then do a



            sudo grub-update





            share|improve this answer























            • Hi Dominique, I do not have Dynamic Memory enabled, so it's not likely that is causing the issue.
              – rkagerer
              Aug 13 '14 at 5:24












            • Please only post answers if you have a definitive solution. Also take care of formatting your posts properly, and note that this is not a forum, so you should always edit your existing post rather than posting another one.
              – slhck
              Aug 13 '14 at 13:24










            • ok I do not want to bore anyone, I'll get my solution elsewhere.
              – delete me
              Aug 13 '14 at 21:26













            up vote
            0
            down vote










            up vote
            0
            down vote









            I found an info in the French Ubuntu forums from other user who has Ubuntu freezes: It may be caused by "dynamic tick".



            Their solution:



            cd /etc/default
            sudo vi grub


            add nohz=true in parameters of the line GRUB_CMDLINE_LINUX_DEFAULT. Then do a



            sudo grub-update





            share|improve this answer














            I found an info in the French Ubuntu forums from other user who has Ubuntu freezes: It may be caused by "dynamic tick".



            Their solution:



            cd /etc/default
            sudo vi grub


            add nohz=true in parameters of the line GRUB_CMDLINE_LINUX_DEFAULT. Then do a



            sudo grub-update






            share|improve this answer














            share|improve this answer



            share|improve this answer








            edited Aug 13 '14 at 13:24









            slhck

            158k47437461




            158k47437461










            answered Aug 12 '14 at 21:46









            delete me

            11




            11












            • Hi Dominique, I do not have Dynamic Memory enabled, so it's not likely that is causing the issue.
              – rkagerer
              Aug 13 '14 at 5:24












            • Please only post answers if you have a definitive solution. Also take care of formatting your posts properly, and note that this is not a forum, so you should always edit your existing post rather than posting another one.
              – slhck
              Aug 13 '14 at 13:24










            • ok I do not want to bore anyone, I'll get my solution elsewhere.
              – delete me
              Aug 13 '14 at 21:26


















            • Hi Dominique, I do not have Dynamic Memory enabled, so it's not likely that is causing the issue.
              – rkagerer
              Aug 13 '14 at 5:24












            • Please only post answers if you have a definitive solution. Also take care of formatting your posts properly, and note that this is not a forum, so you should always edit your existing post rather than posting another one.
              – slhck
              Aug 13 '14 at 13:24










            • ok I do not want to bore anyone, I'll get my solution elsewhere.
              – delete me
              Aug 13 '14 at 21:26
















            Hi Dominique, I do not have Dynamic Memory enabled, so it's not likely that is causing the issue.
            – rkagerer
            Aug 13 '14 at 5:24






            Hi Dominique, I do not have Dynamic Memory enabled, so it's not likely that is causing the issue.
            – rkagerer
            Aug 13 '14 at 5:24














            Please only post answers if you have a definitive solution. Also take care of formatting your posts properly, and note that this is not a forum, so you should always edit your existing post rather than posting another one.
            – slhck
            Aug 13 '14 at 13:24




            Please only post answers if you have a definitive solution. Also take care of formatting your posts properly, and note that this is not a forum, so you should always edit your existing post rather than posting another one.
            – slhck
            Aug 13 '14 at 13:24












            ok I do not want to bore anyone, I'll get my solution elsewhere.
            – delete me
            Aug 13 '14 at 21:26




            ok I do not want to bore anyone, I'll get my solution elsewhere.
            – delete me
            Aug 13 '14 at 21:26












            up vote
            0
            down vote













            I think I also have this problem – have you found this:
            https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1470250






            share|improve this answer

























              up vote
              0
              down vote













              I think I also have this problem – have you found this:
              https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1470250






              share|improve this answer























                up vote
                0
                down vote










                up vote
                0
                down vote









                I think I also have this problem – have you found this:
                https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1470250






                share|improve this answer












                I think I also have this problem – have you found this:
                https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1470250







                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Oct 1 '15 at 8:15









                Philippp

                17114




                17114






























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