drdb kernal 4 crash

[G. Kooistra]

After upgrading ubuntu 14.04 LTS from kernal 3 to kernal 4.4.0-38-generic, we got issues with DRBD.
Especially during high load, the drdb kernal will gif issues.

The DRBD status go's to a timeout and the server becomes unstable (also the KVM's running on it) and afther some minutes/hours, the system hangs.
Only a hard reset is possible.

This problem randomly appear after a few minutes / hours / days.

Got this issue on multiple servers.
The workaround is to go back to the old kernel.

Logfiles:
https://ubuntuforums.org/showthread.php?t=2336150

Ubuntu version:
Description: Ubuntu 14.04.5 LTS
Release: 14.04

drbd8-utils:
  Installed: 2:8.4.4-1ubuntu1
  Candidate: 2:8.4.4-1ubuntu1
  Version table:
 *** 2:8.4.4-1ubuntu1 0
        500 http://nl.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
        100 /var/lib/dpkg/status

[Brad Figg (brad-figg)]

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

apport-collect 1629260

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.

[Joseph Salisbury (jsalisbury)]

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.8 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'.

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/v4.8

[G. Kooistra (gkooistrago)]

We had installed the mainline kernel on two machines and tested it again.
The issue still remains. One of the two machines get slow, lost the drdb connection en begin to hang.

The other machine works fine (just like before).

[G. Kooistra (gkooistrago)]

We got two servers with deferent RAID cards.
Server 1 got this DRBD issue (3ware Inc 7xxx/8xxx-series PATA/SATA-RAID)
Server 2 dos not has this problem (Areca Technology Corp. ARC-1200 2-Port PCI-Express to SATA II RAID Controller)