** Description changed: + [ Impact ] + + In ppc64el kernels, loading modules without any + __patchable_function_entries section would fail due to a + zero size allocation of executable memory for ftrace trampolines. + This causes boot failures when trying to boot the kernel on IBM Power 9 + systems. In particular becasue IBM Power 9 tries to load i40e at boot + time, which fails. + + The bug was introduced by commit eec37961a56a which landed in v6.13-rc1, + which assumed all modules have traceable functions. + + [ Fix ] + + Apply the following patch: + - https://lore.kernel.org/all/wlscshbqan2svtqkz5xc6v47tzndfnsvge7h4lbfn67zoplekl@elt2oxwhrp6f/T/ + which has not landed in linux-next yet. + + [ Test Plan ] + + Compile and boot test the kernel on a Power 9 bare metal machine. + + [ Where problems could occur ] + + The patch simply removes an if branch which handles (incorrectly) errors during + module loading on ppc64 systems. The regression potential therefore is + very low. + + ----- + Not able to netboot install a Power9 bare metal. It fails because it is not detecting network, after that the system goes to shell/busybox ``` Begin: Waiting up to 180 secs for any network device to become available ... Failure: Network device did not appear in time done. dhcpcd-10.1.0 starting dev: loaded udev [ 188.277865] 8021q: 802.1Q VLAN Support v1.8 no valid interfaces found exiting due to oneshot aborting as link detection is disabled Sleeping 30 seconds before retrying getting a DHCP lease dhcpcd-10.1.0 starting dev: loaded udev no valid interfaces found exiting due to oneshot aborting as link detection is disabled dhcpcd exited Sleeping 60 seconds before retrying getting a DHCP lease dhcpcd-10.1.0 starting dev: loaded udev no valid interfaces found exiting due to oneshot aborting as link detection is disabled dhcpcd exited Sleeping 90 seconds before retrying getting a DHCP lease dhcpcd-10.1.0 starting dev: loaded udev no valid interfaces found exiting due to oneshot aborting as link detection is disabled dhcpcd exited Sleeping 120 seconds before retrying getting a DHCP lease - BusyBox v1.37.0 (Ubuntu 1:1.37.0-4ubuntu1) built-in shell (ash) Enter 'help' for a list of built-in commands. (initramfs) ```
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2104297 Title: not able to install a Power9 bare metal with Ubuntu 25.04 Plucky To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/2104297/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
