On Tue, 27 Dec 2022 09:26:23 +0800
Coiby Xu <coxu(a)redhat.com> wrote:
Currently, if users specify dumping to nfsv4 target via
dracut_args --mount "<NFS-server-ip>:/var/crash /mnt nfs defaults"
it fails with the following errors,
[ 5.159760] mount: mount.nfs: Protocol not supported
[ 5.164502] systemd: mnt.mount: Mount process exited, code=exited,
[ 5.167616] systemd: mnt.mount: Failed with result 'exit-code'.
[FAILED] Failed to mount /mnt.
This is because nfsv4-releted drivers are not installed to kdump initrd.
mkdumprd calls dracut with "--hostonly-mode strict". If nfsv4-related
drivers aren't loaded before calling dracut, they won't be installed.
When users specify nfs dumping via dracut_args, kexec-tools won't mount
the nfs fs beforehand hence nfsv4-related drivers won't be installed.
Note dracut only installs the nfs driver i.e. nfsv3 driver for "--mount
... nfs". So also install nfsv4-related drivers when users specify nfs
dumping via dracut_args. Since nfs_layout_nfsv41_files depends on nfsv4,
the nfsv4 driver will be installed automatically.
As for the reason why we support nfs dumping via dracut_args instead of
asking user to use the nfs directive, please refer to commit 74c6f464
("Support special mount information via 'dracut_args'").
I don't understand why this was designed the way it is. Personally I
would have treated the dracut_args and nfs directive identical and
would simply have added a "--no-mount" option...
Anyway that's nothing we can change right now. So your patch looks like
a valid workaround to me.
Fixes: 4eedcae5 ("dracut-module-setup.sh: don't include
Signed-off-by: Coiby Xu <coxu(a)redhat.com>
mkdumprd | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/mkdumprd b/mkdumprd
index 3e250e02..51ca4f01 100644
@@ -420,6 +420,15 @@ while read -r config_opt config_val; do
+ # When users specify nfs dumping via dracut_args, kexec-tools won't
+ # mount nfs fs beforehand thus nfsv4-related drivers won't be installed
+ # because we call dracut with --hostonly-mode strict. So manually install
+ # nfsv4-related drivers.
+ if [[ $(get_dracut_args_fstype "$config_val") == nfs* ]]; then
+ add_dracut_arg "--add-drivers" nfs_layout_nfsv41_files
while read -r dracut_arg; do
done <<< "$(echo "$config_val" | xargs -n 1 echo)"