The glibc-2.12-1.166.el6_7.3.x86_64.rpm and the rest of the family there 
that match the offending debuginfo package are in the 6x fastbugs.  You 
have the base and security for 6x enabled, but not fastbugs. What 
version of 6 are you on?  Maybe the debuginfo ended up in one of the 
point release fastbugs by accident...  Can you check which repo the 
debuginfo package came from?

Try enabling the 6x fastbugs repo and see if it cleans up.

-Mark

On 10/01/2015 04:18 PM, Benjamin Moody wrote:
> Hi,
>
> My SL6 system seems to have recently upgraded glibc-debuginfo to version
>   2.12-1.166.el6_7.3.x86_64
>
> However, glibc is still at version
>   2.12-1.166.el6.x86_64
>
> The two packages are not compatible (e.g., gdb shows errors about CRC
> mismatches.)
>
> Running the command that gdb recommends ("debuginfo-install
> glibc-2.12-1.166.el6.x86_64") gives
>    Package matching glibc-debuginfo-2.12-1.166.el6.x86_64 already
> installed. Checking for update.
>    ...
>    No debuginfo packages available to install
>
> - Do I somehow have the wrong debuginfo yum repository configured?
> - Is there a way to force yum to install the correct version of glibc-debuginfo?
> - Does the corresponding glibc package exist somewhere and should I
> upgrade to it?
>
> Here are my currently enabled repositories...
>
> /etc/yum.repos.d # egrep '^(name|baseurl|enabled)' *.repo
> epel-testing.repo:name=Extra Packages for Enterprise Linux 6 - Testing
> - $basearch
> epel-testing.repo:enabled=0
> epel-testing.repo:name=Extra Packages for Enterprise Linux 6 - Testing
> - $basearch - Debug
> epel-testing.repo:enabled=0
> epel-testing.repo:name=Extra Packages for Enterprise Linux 6 - Testing
> - $basearch - Source
> epel-testing.repo:enabled=0
> epel.repo:name=Extra Packages for Enterprise Linux 6 - $basearch
> epel.repo:enabled=0
> epel.repo:name=Extra Packages for Enterprise Linux 6 - $basearch - Debug
> epel.repo:enabled=0
> epel.repo:name=Extra Packages for Enterprise Linux 6 - $basearch - Source
> epel.repo:enabled=0
> sl-livecd-extra.repo:name=Extra Packages for LiveCD/DVD $releasever - $basearch
> sl-livecd-extra.repo:baseurl=http://www.livecd.ethz.ch/download/sl-livecd-extra/$releasever/$basearch
> sl-livecd-extra.repo:enabled=0
> sl-other.repo:name=Scientific Linux $releasever - $basearch - fastbug updates
> sl-other.repo:baseurl=http://ftp.scientificlinux.org/linux/scientific/$releasever/$basearch/updates/fastbugs/
> sl-other.repo:enabled=0
> sl-other.repo:name=Scientific Linux Debuginfo
> sl-other.repo:baseurl=http://ftp.scientificlinux.org/linux/scientific/$releasever/archive/debuginfo/
> sl-other.repo:enabled=0
> sl-other.repo:name=Scientific Linux Testing - $basearch
> sl-other.repo:baseurl=http://ftp.scientificlinux.org/linux/scientific/6rolling/testing/$basearch/
> sl-other.repo:enabled=0
> sl-other.repo:name=Scientific Linux Testing - Source
> sl-other.repo:baseurl=http://ftp.scientificlinux.org/linux/scientific/6rolling/testing/SRPMS/
> sl-other.repo:enabled=0
> sl-other.repo:name=Scientific Linux Addon Packages
> sl-other.repo:baseurl=http://ftp.scientificlinux.org/linux/scientific/$releasever/$basearch/addons
> sl-other.repo:enabled=0
> sl.repo:name=Scientific Linux $releasever - $basearch
> sl.repo:baseurl=http://ftp.scientificlinux.org/linux/scientific/$releasever/$basearch/os/
> sl.repo:enabled=1
> sl.repo:name=Scientific Linux $releasever - $basearch - security updates
> sl.repo:baseurl=http://ftp.scientificlinux.org/linux/scientific/$releasever/$basearch/updates/security/
> sl.repo:enabled=1
> sl.repo:name=Scientific Linux $releasever - Source
> sl.repo:baseurl=http://ftp.scientificlinux.org/linux/scientific/$releasever/SRPMS/
> sl.repo:enabled=0
> sl6x.repo:name=Scientific Linux 6x - $basearch
> sl6x.repo:baseurl=http://ftp.scientificlinux.org/linux/scientific/6x/$basearch/os/
> sl6x.repo:enabled=1
> sl6x.repo:name=Scientific Linux 6x - $basearch - security updates
> sl6x.repo:baseurl=http://ftp.scientificlinux.org/linux/scientific/6x/$basearch/updates/security/
> sl6x.repo:enabled=1
> sl6x.repo:name=Scientific Linux 6x - $basearch - fastbug updates
> sl6x.repo:baseurl=http://ftp.scientificlinux.org/linux/scientific/6x/$basearch/updates/fastbugs/
> sl6x.repo:enabled=0
> softwarecollections.repo:baseurl=http://ftp.scientificlinux.org/linux/scientific/6x/external_products/softwarecollections/$basearch/
> softwarecollections.repo:enabled=1
> softwarecollections.repo:baseurl=http://ftp.scientificlinux.org/linux/scientific/6x/external_products/softwarecollections/SRPMS/
> softwarecollections.repo:enabled=0
>