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Description of problem: Kdump kernel save vmcore failure on 4.14.* kernel. Here is some console log by test machine: ] Reached target Initrd Default Target. Starting dracut pre-pivot and cleanup hook... [ OK ] Started dracut pre-pivot and cleanup hook. Starting Kdump Vmcore Save Service... kdump: dump target is /dev/mapper/rhel_ibm--x3950x6--01-root kdump: saving to /sysroot//var/crash/127.0.0.1-2017-10-26-23:52:33/ kdump: saving vmcore-dmesg.txt kdump: saving vmcore-dmesg.txt complete kdump: saving vmcore sadump: does not have partition header sadump: read dump device as unknown format sadump: unknown format LOAD (0) phys_start : 1000000 phys_end : 2388000 virt_start : ffffffff81000000 virt_end : ffffffff82388000 ... ... Buffer size for the cyclic mode: 4194304 vtop4_x86_64: Can't get the symbol of init_level4_pgt. readmem: Can't convert a virtual address(ffffffff81c10284) to physical address. readmem: type_addr: 0, addr:ffffffff81c10284, size:390 check_release: Can't get the address of system_utsname. makedumpfile Failed. kdump: saving vmcore failed [ FAILED ] Failed to start Kdump Vmcore Save Service. See 'systemctl status kdump-capture.service' for details. Version-Release number of selected component (if applicable): kernel-4.14.0-0.rc6.1.el7a.x86_64 kexec-tools-2.0.15-1.el7.x86_64 dracut-033-502.el7.x86_64 How reproducible: Steps to Reproduce: 1. Please set --message-level to 31 and also set rd.debug=3. 2. 3. Actual results: Expected results: Additional info:
Confirmed in Debian as well. Linux 4.14.0-1-rt-amd64 #1 SMP PREEMPT RT Debian 4.14.2-1 (2017-11-30) kexec-tools 2.0.15-1 amd64
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2018:0807