Systems with large amounts of memory (1 TB and higher) may result in kdump crashes due to out-of-memory errors. The error usually results in a kernel panic with the error message:

Kernel panic - not syncing: timer doesn't work through Interrupt-remapped IO-APIC 

Workaround: Edit the /etc/sysconfig/kdump file and append the "iommu=off" option to the end of KDUMP_COMMANDLINE_APPEND variable.

After you have finished editing the file, perform the following steps as root on the command line of the affected server:

# touch /etc/kdump.conf
service kdump restart

Bug 18629716