An RHTS machine ibm-ls21-7972-01.lab.boston.redhat.com hung shortly after
finishing RHEL-5 installation:

04/23/07 19:03:07  JobID:19272 Test:/distribution/reservesys
04/23/07 19:03:08  testID:352449 start_time:
Sending rpm info to armstrong.rhts.boston.redhat.com
Collecting rpm package.info for..
 rh-tests-distribution-reservesys
resp = client.results.recipeTestRpms(test_id, pkg_list)
/mnt/tests/distribution/reservesys /
04/23/07 19:03:10  JobID:19272 Test:/distribution/reservesys
/etc/rc3.d/S99rhts: line 16:  2533 Terminated              /mnt/tests/runtests.sh
Starting smartd: [  OK  ]
list_del corruption. next->prev should be ffff81012ee00000, but was 0000000000000000
----------- [cut here ] --------- [please bite here ] ---------
Kernel BUG at lib/list_debug.c:70
invalid opcode: 0000 [1] SMP 
last sysfs file:
/devices/pci0000:00/0000:00:06.0/0000:03:04.0/host0/port-0:0/end_device-0:0/target0:0:0/0:0:0:0/vendor
CPU 1 
Modules linked in: autofs4 hidp rfcomm l2cap bluetooth sunrpc ipv6 video sbs
i2c_ec i2c_core button battery asus_acpi acpi_memhotplug ac parport_pc lp
parport sg serio_raw shpchp k8_edac bnx2 edac_mc pcspkr dm_snapshot dm_zero
dm_mirror dm_mod mptsas mptscsih mptbase scsi_transport_sas sd_mod scsi_mod ext3
jbd ehci_hcd ohci_hcd uhci_hcd


See the URL for the complete log file from RHTS.

No idea if it's reproducible.