Hi,

We tried to install the lastest kernel update kernel-2.6.32-358.6.1.el6 and due to
an odd chain of dependencies, all openafs packages were removed.

On our systems, we only keep 2 kernels (as opposed to the default of 3).  So we have
kernels:

# rpm -q kernel
kernel-2.6.32-279.19.1.el6.x86_64
kernel-2.6.32-358.2.1.el6.x86_64

and openafs packages:

openafs.x86_64                                   1.6.2-0.144.sl6                     @sl/6.2
openafs-client.x86_64                            1.6.2-0.144.sl6                     @sl/6.2
openafs-krb5.x86_64                              1.6.2-0.144.sl6                     @sl/6.2
openafs-module-tools.x86_64                      1.6.2-0.144.sl6                     @sl-security/6.2
kmod-openafs.noarch                              1.6.2-4.SL64.el6                    @sl-security/6.2
kmod-openafs-279.x86_64                          1.6.2-0.144.sl6.279                 @sl-security/6.2
kmod-openafs-358.x86_64                          1.6.2-0.144.sl6.358.0.1             @sl-security/6.2

When the kernel-2.6.32-358.6.1 packages install (due to installonly_limit=2 in our yum.conf), the
"279" kernel is removed and that triggers the removal of kmod-openafs-279.  That seems to trigger
the removal of kmod-openafs and THAT triggers the removal of kmod-openafs-358. 

All this seems to trigger the removal of openafs-client and that leads to local afs-depend
packages to be removed (usrlocalITbin).  The output from a yum upgrade follows:

# yum update kernel
Loaded plugins: aliases, priorities, product-id, protectbase, refresh-packagekit, subscription-manager
Updating Red Hat repositories.
1427 packages excluded due to repository priority protections
0 packages excluded due to repository protections
Setting up Update Process
Resolving Dependencies
--> Running transaction check
---> Package kernel.x86_64 0:2.6.32-358.6.1.el6 will be installed
--> Processing Dependency: kernel-firmware >= 2.6.32-358.6.1.el6 for package: kernel-2.6.32-358.6.1.el6.x86_64
--> Running transaction check
---> Package kernel-firmware.noarch 0:2.6.32-358.2.1.el6 will be updated
---> Package kernel-firmware.noarch 0:2.6.32-358.6.1.el6 will be an update
--> Finished Dependency Resolution
--> Running transaction check
---> Package kernel.x86_64 0:2.6.32-279.19.1.el6 will be erased
--> Processing Dependency: kernel(do_settimeofday) = 0x5603cf43 for package: kmod-openafs-279-1.6.2-0.144.sl6.279.x86_64
--> Running transaction check
---> Package kmod-openafs-279.x86_64 0:1.6.2-0.144.sl6.279 will be erased
--> Processing Dependency: kmod-openafs-279 for package: kmod-openafs-1.6.2-4.SL64.el6.noarch
--> Running transaction check
---> Package kmod-openafs.noarch 0:1.6.2-4.SL64.el6 will be erased
--> Processing Dependency: openafs-kernel >= 1.6 for package: openafs-client-1.6.2-0.144.sl6.x86_64
--> Running transaction check
---> Package openafs-client.x86_64 0:1.6.2-0.144.sl6 will be erased
--> Processing Dependency: openafs-client >= 1.6 for package: kmod-openafs-358-1.6.2-0.144.sl6.358.0.1.x86_64
--> Processing Dependency: openafs-client for package: usrlocalITbin-6.0-el6.bucs.1.noarch
--> Running transaction check
---> Package kmod-openafs-358.x86_64 0:1.6.2-0.144.sl6.358.0.1 will be erased
---> Package usrlocalITbin.noarch 0:6.0-el6.bucs.1 will be erased
--> Finished Dependency Resolution

Dependencies Resolved

 ===================================================================================================================================
 Package                         Arch                  Version                                Repository                       Size
 ===================================================================================================================================
Installing:
 kernel                          x86_64                2.6.32-358.6.1.el6                     sl-security                      26 M
Removing:
 kernel                          x86_64                2.6.32-279.19.1.el6                    @sl-security/6.2                113 M
Updating for dependencies:
 kernel-firmware                 noarch                2.6.32-358.6.1.el6                     sl-security                      11 M
Removing for dependencies:
 kmod-openafs                    noarch                1.6.2-4.SL64.el6                       @sl-security/6.2                0.0  
 kmod-openafs-279                x86_64                1.6.2-0.144.sl6.279                    @sl-security/6.2                1.3 M
 kmod-openafs-358                x86_64                1.6.2-0.144.sl6.358.0.1                @sl-security/6.2                1.3 M
 openafs-client                  x86_64                1.6.2-0.144.sl6                        @sl/6.2                         2.4 M
 usrlocalITbin                   noarch                6.0-el6.bucs.1                         @cs/6.1                         391  

Transaction Summary
 ===================================================================================================================================
Install       1 Package(s)
Upgrade       1 Package(s)
Remove        6 Package(s)

Total download size: 37 M
Is this ok [y/N]: 


People may not see this behavior this time around if they are defaulting to keeping
three kernels installed, but it will sure hit everyone with the next kernel update.

-Joe Szep



-- 
Joseph T. Szep
Manager of Distributed Systems
Department of Computer Science
Boston University
(617)353-1498
[log in to unmask]
http://www.cs.bu.edu/