Hello, "echo c > /proc/sysrq-trigger" generates the kernel dump but it reboots the system. I'd like to generate kernel dump without system reboot. I think it is possible to jump to the kdump kernel and generate kernel dump, and come back to the operating kernel with kexec. I know I can jump to the kdump kernel with "kexec -e" but I cannot figure out how to come back to the operating kernel. For example, I tried following sequences after reading kexec manual page. 0. rebuild kernel with CONFIG_KEXEC_JUMP option 1. kexec --load=/boot/vmlinuz --initrd=/boot/initrd --reuse-cmdline 2. kexec -e 3. now kdump kernel is running 4. kexec --load-jump-back-helper --entry=<ADDRESS> 5. kexec -e I can jump to the kdump kernel with step 1 and step 2. kexec manual says I need an entry address. I don't know what address I should use. I found a email thread about jump_back_entry= but there is no parameter like jump_back_entry in kernel booting parameters of v4.4~v4.14. Does anybody know how to use kexec to jump between kdump kernel and operating kernel? -- Best regards, Gioh Kim _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec
