[Bug 962189] Re: dkms module is not automatically rebuild when installing new linux-image package

[James Page]

** Description changed:

+ [Impact]
+ Users of the openvswitch + openvswitch DKMS modules are broken after kernel upgrades without manual intervention.  DKMS modules should be auto-rebuilt.
+ 
+ [Test Case]
+ Install Ubuntu 12.04 (without any kernel updates)
+ sudo apt-get install openvswitch-datapath-dkms
+ sudo apt-get install openvswitch-switch
+ Upgrade to new 3.2 kernel update (or even the new 3.5 kernel for 12.04.2)
+ Reboot
+ sudo service openvswitch-switch start
+ (will fail as DKMS modules not found for new kernel)
+ 
+ 
+ [Regression Potential]
+ The fix for this is minimal (single line) and just impacts the auto-rebuild config for dkms.
+ 
+ However its bundled with the 3.5 kernel compatibility fixes which also
+ remove the _mod suffix from the DKMS built modules.  This has the effect
+ that if the DKMS modules are not built openvswitch will fall-back to the
+ less feature-full native openvswitch module provided by the kernel
+ itself (this is aligned to behavior in quantal and raring).
+ 
+ 
+ [Original Bug Report]
  Hello all,
  
  I've noticed that the openvswitch_mod and brcompat_mod modules are not
  automatically rebuild when I've upgraded to the latest linux-
  image-3.2.0-20-generic, thus rendering my openvswitch config unusable
  after a reboot to said new kernel.
  
  Manual rebuilding and installation worked as expected:
  ---------------cut---------
  root at d02-spi-2:~# uname -a
  Linux d02-spi-2 3.2.0-20-generic #32-Ubuntu SMP Thu Mar 22 02:22:46 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
  
  root at d02-spi-2:~# dpkg -l | egrep 'linux-(image|headers)'
  ii  linux-headers-3.2.0-19          3.2.0-19.31                  Header files related to Linux kernel version 3.2.0
  ii  linux-headers-3.2.0-19-generic  3.2.0-19.31                  Linux kernel headers for version 3.2.0 on 64 bit x86 SMP
  ii  linux-headers-3.2.0-20          3.2.0-20.32                  Header files related to Linux kernel version 3.2.0
  ii  linux-headers-3.2.0-20-generic  3.2.0-20.32                  Linux kernel headers for version 3.2.0 on 64 bit x86 SMP
  ii  linux-headers-server            3.2.0.20.22                  Linux kernel headers on Server Equipment.
  ii  linux-image-3.2.0-19-generic    3.2.0-19.31                  Linux kernel image for version 3.2.0 on 64 bit x86 SMP
  ii  linux-image-3.2.0-20-generic    3.2.0-20.32                  Linux kernel image for version 3.2.0 on 64 bit x86 SMP
  ii  linux-image-server              3.2.0.20.22                  Linux kernel image on Server Equipment.
  
  root at d02-spi-2:~# dkms status -m openvswitch
  openvswitch, 1.4.0, 3.2.0-19-generic, x86_64: installed
  root at d02-spi-2:~# dkms build -m openvswitch -v 1.4.0
  
  Kernel preparation unnecessary for this kernel.  Skipping...
  
  Building module:
  cleaning build area....(bad exit status: 2)
  ./configure --with-linux=/usr/src/linux-headers-3.2.0-20-generic ; make -C datapath/linux..........
  cleaning build area....(bad exit status: 2)
  
  DKMS: build completed.
  root at d02-spi-2:~# dkms install -m openvswitch -v 1.4.0
  
  openvswitch_mod:
  Running module version sanity check.
-  - Original module
-    - No original module exists within this kernel
-  - Installation
-    - Installing to /lib/modules/3.2.0-20-generic/updates/dkms/
+  - Original module
+    - No original module exists within this kernel
+  - Installation
+    - Installing to /lib/modules/3.2.0-20-generic/updates/dkms/
  
  brcompat_mod.ko:
  Running module version sanity check.
-  - Original module
-    - No original module exists within this kernel
-  - Installation
-    - Installing to /lib/modules/3.2.0-20-generic/updates/dkms/
+  - Original module
+    - No original module exists within this kernel
+  - Installation
+    - Installing to /lib/modules/3.2.0-20-generic/updates/dkms/
  
  depmod......
  
  DKMS: install completed.
  root at d02-spi-2:~# dkms status -m openvswitch
  openvswitch, 1.4.0, 3.2.0-19-generic, x86_64: installed
  openvswitch, 1.4.0, 3.2.0-20-generic, x86_64: installed
  ---------------cut---------
  
  Regards,
  Ralf
  
  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: openvswitch-datapath-dkms 1.4.0-1ubuntu1
  ProcVersionSignature: Ubuntu 3.2.0-20.32-generic 3.2.12
  Uname: Linux 3.2.0-20-generic x86_64
  ApportVersion: 1.94.1-0ubuntu2
  Architecture: amd64
  Date: Thu Mar 22 14:42:27 2012
  PackageArchitecture: all
  SourcePackage: openvswitch
  UpgradeStatus: No upgrade log present (probably fresh install)

** Changed in: openvswitch (Ubuntu Precise)
   Importance: Medium => High

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https://bugs.launchpad.net/bugs/962189

Title:
  dkms module is not automatically rebuild when installing new linux-
  image package

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