------- Comment From [email protected] 2020-10-14 07:51 EDT------- Sorry for not responfing earlier. After installing a new system I can see that the update happening:
$ cat /proc/cmdline root=/dev/mapper/vgubuntu-root crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M However it still turns out that - if using an encrypted volume - it's not possible to unlock the volume from the kdump kernel for a ~2GB VM as the 320MB are still not sufficient. Bumping the VM memory to 4GB will allow the kdump kernel to unlock the volume. I think that either 512M should be the lowest value used for the crashkernel, or at least a warning should be emitted, alerting the system administrator that for a < 4GB machine kdump is not going to work with an encrypted root/dump volume. -- 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/1877533 Title: [20.10 FEAT] Increase the crashkernel setting if the root volume is luks2-encrypted Status in Ubuntu on IBM z Systems: In Progress Status in linux package in Ubuntu: Invalid Status in makedumpfile package in Ubuntu: In Progress Status in linux source package in Focal: Invalid Status in makedumpfile source package in Focal: In Progress Status in linux source package in Groovy: Invalid Status in makedumpfile source package in Groovy: In Progress Bug description: Description: In case the volume containing the root filesystem is encrypted using LUKS2 the memory used while unlocking the volume may exceed the size allocated to the kdump kernel. This will lead to a failure while processing kdump and the dump file will not be stored. Unfortunately, this condition may not be detected by a client before a problem occurs. The request is to have the kdump package installation script check for LUKS2 encryption (more precisely for Argon2i PBKDF, which is the root cause of the high memory usage). If the condition is met, the installation procedure should increase the crashkernel parameter to a higher value (>=512M)or issue a warning, if the system memory is insufficient to reserve enough crashkernel memory. Business Case: Pervasive Encryption and Secure Execution require encryption of the filesystems in order to keep customer data secure at all times. With the increasing usage of these technologies, the number of kdump will rise too, typically at inconvenient times, when the kdump is triggered due to a real customer issue. With the suggested change, the number of customer complaints and effort to handle them will be reduced. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1877533/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
