dracut-module-setup.sh: skip installing driver for the loopback interface
Resolves: bz2151500
Upstream: Fedora
Conflict: None
commit 3b22cce1cb7dd12be07822018d08c9bb8f03add9
Author: Coiby Xu <coxu@redhat.com>
Date: Wed Dec 14 10:12:17 2022 +0800
dracut-module-setup.sh: skip installing driver for the loopback
interface
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2151500
Currently, kdump initrd fails to be built when dumping vmcore to
localhost via ssh or nfs,
kdumpctl[3331]: Cannot get driver information: Operation not supported
kdumpctl[1991]: dracut: Failed to get the driver of lo
dracut[2020]: Failed to get the driver of lo
kdumpctl[1775]: kdump: mkdumprd: failed to make kdump initrd
kdumpctl[1775]: kdump: Starting kdump: [FAILED]
systemd[1]: kdump.service: Main process exited, code=exited, status=1/FAILURE
systemd[1]: kdump.service: Failed with result 'exit-code'.
systemd[1]: Failed to start Crash recovery kernel arming.
systemd[1]: kdump.service: Consumed 1.710s CPU time.
This is because the loopback interface is used for transferring vmcore and
ethtool can't get the driver of the loopback interface. In fact, once
COFNIG_NET is enabled, the loopback device is enabled and there is no driver
for the loopback device. So skip installing driver for the loopback device.
The loopback interface is implemented in linux/drivers/net/loopback.c
and always has the name "lo". So we can safely tell if a network
interface is the loopback interface by its name.
Fixes: a65dde2d ("Reduce kdump memory consumption by only installing needed NIC drivers")
Reported-by: Martin Pitt <mpitt@redhat.com>
Reported-by: Rich Megginson <rmeggins@redhat.com>
Reviewed-by: Lichen Liu <lichliu@redhat.com>
Reviewed-by: Philipp Rudo <prudo@redhat.com>
Signed-off-by: Coiby Xu <coxu@redhat.com>
Signed-off-by: Lichen Liu <lichliu@redhat.com>