------- Comment From hbath...@in.ibm.com 2018-01-22 13:19 EDT------- (In reply to comment #0) > ---Problem Description--- > A default offset of 128MB is enforced for crashkernel by kdump-tools utility > overriding the kernel default. > > While the kernel default offset for crashkernel is also 128MB, that may > change > and the right thing to do would be to let the kernel decide on the offset of > crashkernel in the default scenario.. > > Get rid of "@128M" in kdump-tools.cfg file > > > Contact Information = hbath...@in.ibm.com > > ---uname output--- > na > > Machine Type = na > > ---Debugger--- > A debugger is not configured > > ---Steps to Reproduce--- > # cat /etc/default/grub.d/kdump-tools.cfg > GRUB_CMDLINE_LINUX_DEFAULT="$GRUB_CMDLINE_LINUX_DEFAULT > crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-: > 4096M@128M"
While the offset is changed to 128MB in some releases, it is still 32M on some. Having the default crashkernel offset as 32MB is NOT a good idea. It would leave the production kernel un-bootable. Please drop the offset of 32M/128M and let the kernel decide on the offset in default case to ensure we don't end up in a scenario where production kernel is unbootable. This applies to all Canonical releases.. Thanks Hari ** Tags removed: severity-medium ** Tags added: severity-critical -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to makedumpfile in Ubuntu. https://bugs.launchpad.net/bugs/1741860 Title: Use the kernel default for crashkernel offset Status in The Ubuntu-power-systems project: Triaged Status in makedumpfile package in Ubuntu: New Bug description: == Comment: #0 - Hari Krishna Bathini <hbath...@in.ibm.com> - 2018-01-08 01:06:41 == ---Problem Description--- A default offset of 128MB is enforced for crashkernel by kdump-tools utility overriding the kernel default. While the kernel default offset for crashkernel is also 128MB, that may change and the right thing to do would be to let the kernel decide on the offset of crashkernel in the default scenario.. Get rid of "@128M" in kdump-tools.cfg file Contact Information = hbath...@in.ibm.com ---uname output--- na Machine Type = na ---Debugger--- A debugger is not configured ---Steps to Reproduce--- # cat /etc/default/grub.d/kdump-tools.cfg GRUB_CMDLINE_LINUX_DEFAULT="$GRUB_CMDLINE_LINUX_DEFAULT crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M@128M" --- The offset is specified via kdump-tools where as the kernel may be the right place to set an offset by default.. Userspace tool common name: kdump-tools The userspace tool has the following bit modes: 64-bit Userspace rpm: kdump-tools Userspace tool obtained from project website: na *Additional Instructions for hbath...@in.ibm.com: -Attach ltrace and strace of userspace application. == Comment: #3 - MAMATHA INAMDAR <mainam...@in.ibm.com> - 2018-01-08 03:05:05 == This bug is opened to follow-up other bug based on the comment 19 https://bugzilla.linux.ibm.com/show_bug.cgi?id=152905#c19 (Canonical Launchpad 1676884 ) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1741860/+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
