The 50-kdump-tools.rules file should look like this:
# The kernel updates the crash elfcorehdr for CPU and memory changes
SUBSYSTEM=="cpu", ATTRS{crash_hotplug}=="1", GOTO="kdump_reload_end"
SUBSYSTEM=="memory", ATTRS{crash_hotplug}=="1", GOTO="kdump_reload_end"
SUBSYSTEM=="memory", ACTION=="online", PROGRAM="/usr/sbin/kdump-config
try-reload"
SUBSYSTEM=="memory", ACTION=="offline", PROGRAM="/usr/sbin/kdump-config
try-reload"
SUBSYSTEM=="cpu", ACTION=="add", PROGRAM="/usr/sbin/kdump-config try-reload"
SUBSYSTEM=="cpu", ACTION=="remove", PROGRAM="/usr/sbin/kdump-config try-reload"
SUBSYSTEM=="cpu", ACTION=="online", PROGRAM="/usr/sbin/kdump-config try-reload"
LABEL="kdump_reload_end"
where the first 3 lines and last 1 line are new/added.
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Packages, which is subscribed to kexec-tools in Ubuntu.
https://bugs.launchpad.net/bugs/2034732
Title:
The 50-kdump-tools.rules file needs update for latest kernel 6.6
feature
Status in kexec-tools package in Ubuntu:
New
Bug description:
The following series has landed in mainline, and will be present in
6.6.
"crash: Kernel handling of CPU and memory hot un/plug"
https://lore.kernel.org/lkml/20230814214446.6659-1-eric.devol...@oracle.com/
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d68b4b6f307d155475cce541f2aee938032ed22e
To take advantage of the performance benefits of that series,
50-kdump-tools.rules
needs an update to optimize the handling of CPU and memory hotplug changes.
It is safe to deploy these rule updates now, ahead of distros/kernels
enabling the feature, since the crash_hotplug sysfs nodes would not be
present and thus the newly introduced rules in 50-kdump-tools would act as a
nop-op and fall thru for legacy behavior. But when distros/kernels
enable the feature, then 50-kdump-tools rules is ready and can properly take
advantage.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/kexec-tools/+bug/2034732/+subscriptions
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