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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 =====
-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>
@@ 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: [  186.726785] BUG: Bad rss-counter state mm:ffff8801264f8000 idx:1 val:1
+[... repeats over and over ... ]
 </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-amd64. Reboot.  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.
+<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

Deinon

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