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Yum list yields segmentation fault

I am not sure when this problem cropped up, but it has. Doing something as simple as a yum list gives me a segmentation fault on Redhat 6.

Code:

    yum list

Loaded plugins: refresh-packagekit, rhnplugin

This system is receiving updates from RHN Classic or RHN Satellite.

Segmentation fault (core dumped)

I did do a little beforehand resesearch

Before posting I did do some research. Solutions involved zlib, but that appears to be correct. Here is the tail end of an strace:

Code:

read(5, "\0\0\0\10\0\0\0\0\0\0\0\0\0\0\0\0", 16) = 16

fcntl(5, F_SETLK, {type=F_UNLCK, whence=SEEK_SET, start=0, len=0}) = 0

futex(0x3bb4951b60, FUTEX_WAKE_PRIVATE, 2147483647) = 0

stat("/var/cache/yum/x86_64/6Workstation/rhel-x86_64-workstation-6/primary.xml.gz", {st_mode=S_IFREG|0600, st_size=14175642, ...}) = 0

stat("/var/cache/yum/x86_64/6Workstation/rhel-x86_64-workstation-6/primary.xml.gz", {st_mode=S_IFREG|0600, st_size=14175642, ...}) = 0

stat("/var/cache/yum/x86_64/6Workstation/rhel-x86_64-workstation-6/primary.xml.gz", {st_mode=S_IFREG|0600, st_size=14175642, ...}) = 0

open("/var/cache/yum/x86_64/6Workstation/rhel-x86_64-workstation-6/primary.xml.gz", O_RDONLY) = 6

lseek(6, 0, SEEK_CUR)                  = 0

read(6, "\37\213\10\0\0\0\0\0\0\0\354\275k\223\3336\266.\374]\277\202\345\367\303vj[j\202wN"..., 8192) = 8192

--- SIGSEGV (Segmentation fault) @ 0 (0) ---

+++ killed by SIGSEGV (core dumped) +++

Segmentation fault (core dumped)

For something as serious as that and given this is RHEL6, I'd phone RH.
I assume this system is registered with RH, otherwise you'd be wasting your time with yum.

can you look at the last things installed with yum
in the log
/var/loc/yum.log

at the bottom is the last things , it is sorted by date

or

did you install something bypassing yum using "rpm"
or
build something from source