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linux:ubuntu [2014/04/23 16:10]
steve [Trusty 14.04 Server]
linux:ubuntu [2014/05/08 17:50]
steve [Kernel Bug]
Line 3: Line 3:
 ===== Trusty 14.04 Server ===== ===== Trusty 14.04 Server =====
  
-Critical issue found when using Xen 4.4.  A kernel BUG is triggered.+==== Kernel Bug ==== 
 + 
 +<wrap em>Critical issue (with workaround)</wrap> found when using Xen 4.4.  A kernel BUG is triggered.
  
 <code> <code>
Line 32: Line 34:
 Apr 23 09:45:02 callisto kernel: [  186.725526] BUG: Bad rss-counter state mm:ffff8801264f8000 idx:0 val:-1 Apr 23 09:45:02 callisto kernel: [  186.725526] BUG: Bad rss-counter state mm:ffff8801264f8000 idx:0 val:-1
 Apr 23 09:45:02 callisto kernel: [  186.726785] BUG: Bad rss-counter state mm:ffff8801264f8000 idx:1 val:1 Apr 23 09:45:02 callisto kernel: [  186.726785] BUG: Bad rss-counter state mm:ffff8801264f8000 idx:1 val:1
 +[... repeats over and over ... ]
 </code> </code>
  
-This is easy to trigger.  First install 14.04 server and install just the OpenSSH server. +This is easy to trigger. 
-Then apt-get install xen-system-amd64Reboot apt-get install vsftpd+ 
 +  Install 14.04 server and choose just the OpenSSH server. 
 +  apt-get install xen-system-amd64 
 +  Reboot 
 +  apt-get install vsftpd 
 As soon as vsftpd tries to start, the bug is triggered. As soon as vsftpd tries to start, the bug is triggered.
  
 +<wrap center round info 60%>Workaround Found by installing the latest Ubuntu Mainline kernel.</wrap>
  
 +  wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.15-rc2-trusty/linux-image-3.15.0-031500rc2-generic_3.15.0-031500rc2.201404201435_amd64.deb
 +  dpkg -i linux-image-3.15.0-031500rc2-generic_3.15.0-031500rc2.201404201435_amd64.deb
 +  # Reboot server.
 +  
 +A bug report has been opened: https://bugs.launchpad.net/ubuntu/+source/vsftpd/+bug/1313450
linux/ubuntu.txt · Last modified: 2014/05/27 17:55 by steve