Hello, I tried to check the kdump utility on the latest kernel (4.13-rc6) on ubuntu. But I could not get it working. Is this functionality broken ? $ kdump-config show DUMP_MODE: kdump USE_KDUMP: 1 KDUMP_SYSCTL: kernel.panic_on_oops=1 KDUMP_COREDIR: /var/crash crashkernel addr: 0x current state: Not ready to kdump kexec command: /sbin/kexec -p --command-line="BOOT_IMAGE=/vmlinuz-4.4.0-87-generic root=/dev/mapper/vg00-rootvol ro printk.time=1 nomodeset gfxpayload=text fb=false irqpoll maxcpus=1 nousb" --initrd=/boot/initrd.img-4.4.0-87-generic /boot/vmlinuz-4.4.0-87-generic When I tried kdump-config load. It started giving me below errors :- "Unknown type (Reserved) while parsing /sys/firmware/memmap/15/type. Please report this as bug. Using RANGE_RESERVED now." So based on this thread (https://lkml.org/lkml/2017/3/23/944). I made below change and tried again. $ git diff diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c index 532da61..851364a 100644 --- a/arch/x86/kernel/e820.c +++ b/arch/x86/kernel/e820.c @@ -982,7 +982,7 @@ static const char *__init e820_type_to_string(struct e820_entry *entry) case E820_TYPE_UNUSABLE: return "Unusable memory"; case E820_TYPE_PRAM: return "Persistent Memory (legacy)"; case E820_TYPE_PMEM: return "Persistent Memory"; - case E820_TYPE_RESERVED: return "Reserved"; + case E820_TYPE_RESERVED: return "reserved"; default: return "Unknown E820 type"; } } With above change, I see below problem :- $ sudo kdump-config load ELF core (kcore) parse failed Cannot load /boot/vmlinuz-4.13.0-rc6+ * failed to load kdump kernel Does anyone know what is this issue? Is this broken functionality on latest kernel. Is there a known fix. Or am I doing anything wrong ? PS: my default is 4.4 kernel. I installed 4.13-rc6 kernel on top of that. Regards Ritesh