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Created attachment 1195584 [details] upstream kenrel v4.8-rc4 kdump log Description of problem: Kdump failed to start kdump vmcore save service in 2nd kernel when i test v4.8-rc4 kernel. Test env: # cat /proc/cmdline BOOT_IMAGE=/vmlinuz-4.8.0-rc4+ root=/dev/mapper/fedora_ibm--x3250m4--04-root ro rd.lvm.lv=fedora_ibm-x3250m4-04/root rd.lvm.lv=fedora_ibm-x3250m4-04/swap crashkernel=256M console=ttyS0,115200n81 LANG=en_US.UTF-8 # cat /sys/kernel/kexec_crash_size 268435456 # kdumpctl restart kexec: unloaded kdump kernel Stopping kdump: [OK] Detected change(s) in the following file(s): /etc/kdump.conf Rebuilding /boot/initramfs-4.8.0-rc4+kdump.img kexec: loaded kdump kernel Starting kdump: [OK] No error occur, but save vmcore failed. Version-Release number of selected component (if applicable): How reproducible: Steps to Reproduce: 1. 2. 3. Actual results: Expected results: Additional info: