<div dir="ltr"><div>Hello,</div><div><div style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration-style:initial;text-decoration-color:initial"><br></div><div style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration-style:initial;text-decoration-color:initial">"echo c > /proc/sysrq-trigger" generates the kernel dump but it reboots the system.</div></div><div>I'd like to generate kernel dump without system reboot.</div><div><br></div><div>I found the CONFIG_KEXEC_JUMP option that described as "it is possible to jump to the kdump kernel and generate kernel dump, and come back to the operating kernel".<br></div><div>So I enabled CONFIG_KEXEC_JUMP option but I cannot figure out how to come back to the operating kernel.<br></div><div><br></div><div>For example, I did following sequences after reading kexec manual page.</div><div><br></div><div><div>1. kexec --load=/boot/vmlinuz --initrd=/boot/initrd --reuse-cmdline</div><div>2. kexec -e</div><div>3. now kdump kernel is running</div><div>4. kexec --load-jump-back-helper --entry=<ADDRESS></div><div>5. kexec -e</div></div><div><br></div><div>I can jump to kdump kernel with step 1 and step 2.</div><div>kexec manual says I need an entry address.</div><div>I don't know what address I should use.</div><div><br></div><div>Does anybody know how to use CONFIG_KEXEC_JUMP options and kexec to jump between kdump kernel and operating kernel?</div><div><br></div><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><br><div>Best regards,</div></div><div>Gioh Kim</div><div><br></div><div><br></div></div></div></div></div>
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