------- Comment From hbath...@in.ibm.com 2017-08-31 04:54 EDT------- (In reply to comment #22) > Hi, Hari.
Hello Cascardo, > > My understanding is that the kernel should handle that. Otherwise, whenever Sadly, it can't as kexec-tools is the one that creates elf headers for /proc/vmcore. So, with a change in available CPUs/memory, kdump kernel needs to be reloaded. Probably, with a udev event that does a try-restart of kdump-tool service on CPU/Memory hot add/remove operation. > the user manually loads a different kdump kernel, a memory hotplug would > cause the default kdump kernel to be loaded, not what the user has loaded. Can't do much about it. If need be, a user has the option to workaround this problem by adjusting the settings in /etc/default/kdump-tools file to load a different kdump kernel.. Thanks Hari -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1655280 Title: ISST-LTE:pVM:roselp4:ubuntu 16.04.2: cp: error reading '/proc/vmcore': Bad address when trying to dump vmcore Status in The Ubuntu-power-systems project: In Progress Status in linux package in Ubuntu: In Progress Bug description: == Comment: #0 - Ping Tian Han <pt...@cn.ibm.com> - 2017-01-09 02:51:00 == ---Problem Description--- Vmcore cannot be saved when triggering bug 150353 on roselp4: Copying data : [ 2.0 %] \/usr/sbin/kdump-config: line 591: 5502 Bus error makedumpfile $MAKEDUMP_ARGS $vmcore_file $KDUMP_CORETEMP [ 512.833872] kdump-tools[5450]: * kdump-tools: makedumpfile failed, falling back to 'cp' [ 573.595449] kdump-tools[5450]: cp: error reading '/proc/vmcore': Bad address [ 573.605717] kdump-tools[5450]: * kdump-tools: failed to save vmcore in /var/crash/201701090223 [ 573.765417] kdump-tools[5450]: * running makedumpfile --dump-dmesg /proc/vmcore /var/crash/201701090223/dmesg.201701090223 [ 574.285506] kdump-tools[5450]: The kernel version is not supported. [ 574.285672] kdump-tools[5450]: The makedumpfile operation may be incomplete. [ 574.285767] kdump-tools[5450]: The dmesg log is saved to /var/crash/201701090223/dmesg.201701090223. [ 574.305422] kdump-tools[5450]: makedumpfile Completed. [ 574.315363] kdump-tools[5450]: * kdump-tools: saved dmesg content in /var/crash/201701090223 [ 574.615688] kdump-tools[5450]: Mon, 09 Jan 2017 02:24:26 -0600 [ 574.705384] kdump-tools[5450]: Rebooting. Stopping ifup for ib0... [ OK ] Stopped ifup for ib0. [ 1008.579897] reboot: Restarting system Contact Information = Ping Tian Han/pt...@cn.ibm.com Carrie Mitsuyoshi/carri...@us.ibm.com ---uname output--- Linux roselp4 4.8.0-34-generic #36~16.04.1-Ubuntu SMP Wed Dec 21 18:53:20 UTC 2016 ppc64le ppc64le ppc64le GNU/Linux Machine Type = lpar ---Debugger--- A debugger is not configured ---Steps to Reproduce--- 1. config kdump on roselp4 2. try to trigger bug 150353 *Additional Instructions for Ping Tian Han/pt...@cn.ibm.com Carrie Mitsuyoshi/carri...@us.ibm.com: -Post a private note with access information to the machine that the bug is occuring on. == Comment: #3 - Brahadambal Srinivasan <brsri...@in.ibm.com> - 2017-01-10 02:42:25 == root@roselp4:~# cat /proc/cmdline BOOT_IMAGE=/boot/vmlinux-4.8.0-34-generic root=UUID=0bcf3431-df8b-499c-9a13-33070f242e0c ro splash quiet crashkernel=384M-:512M root@roselp4:~# dmesg | grep Reser [ 0.000000] Reserving 512MB of memory at 128MB for crashkernel (System RAM: 21760MB) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1655280/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
