I have 40 brand new Cavium R270-T60-V6 systems (T32 BIOS) with CentOS 7.3.1611 installed. Five of them are failing at boot with: kdumpctl[9698]: Could not find a free area of memory of 0x10000 bytes... kdumpctl[9698]: locate_hole failed kdumpctl[9698]: kexec: failed to load kdump kernel kdumpctl[9698]: Starting kdump: [FAILED] The systems are identical in every way (Memory, CPU, disks, firmware, network, location....). A comparison of their "dmesg" output shows no smoking gun, but I do not know if differences like this are significant: < efi: ESRT=0x13ffe1b0e98 SMBIOS 3.0=0xfffeb000 ACPI 2.0=0x13feaba0000 --- > efi: ESRT=0x13ffe1b0e98 SMBIOS 3.0=0xfffeb000 ACPI 2.0=0x13feab9f000 < Memory: 533473024K/536820736K available (7232K kernel code, 1406K rwdata, 3456K rodata, 1152K init, 6589K bss, 2823424K reserved, 524288K cma-reserved) --- > Memory: 533473152K/536820736K available (7232K kernel code, 1406K rwdata, 3456K rodata, 1152K init, 6589K bss, 2823296K reserved, 524288K cma-reserved) Any tips on where to look next are appreciated. (Also, if there is a more appropriate distro for this question, please advise). Peace. -- Matt McLean ARC-TS Operations mattmc at umich.edu