dracut

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I observed the following directory layout under /dev/disk/by-path:

/dev/disk/by-path/ ├── pci-0000:00:07.0 -> ../../vda ├── pci-0000:00:07.0-part │   ├── by-partnum │   │   ├── 1 -> ../../../../vda1 │   │   ├── 2 -> ../../../../vda2 │   │   └── 3 -> ../../../../vda3 │   ├── by-partuuid │   │   ├── 102645f0-b6a7-47d5-93ae-60bd063ecbc5 -> ../../../../vda1 │   │   ├── 32dc3e8a-70cb-4afb-8642-d4f2e0a92941 -> ../../../../vda3 │   │   └── 46beb739-55c1-4746-ab90-b329a0c82ea5 -> ../../../../vda2 │   └── by-uuid │   └── 11ea5cf3-7132-40d4-a114-a8d76edca51f -> ../../../../vda2 ├── pci-0000:00:07.0-part1 -> ../../vda1 ├── pci-0000:00:07.0-part2 -> ../../vda2 ├── pci-0000:00:07.0-part3 -> ../../vda3 ├── virtio-pci-0000:00:07.0 -> ../../vda ├── virtio-pci-0000:00:07.0-part1 -> ../../vda1 ├── virtio-pci-0000:00:07.0-part2 -> ../../vda2 └── virtio-pci-0000:00:07.0-part3 -> ../../vda3

As showed above, 'pci-0000:00:07.0-part' is a directory, so get_maj_min() returns '0:0' for it.

This will raise an issue in the case that kdump dumps the vmcore through nfs. In that case, no block device is passed to get_persistent_dev(), so _dev=$(get_maj_min "$1") also equals '0:0'. Finally, it wrongly fits into the match: if [ "$_tmp" = "$_dev" ]; then printf -- "%s" "$i" return fi

And kdump kernel boots up and wait for 'pci-0000:00:07.0-part' indefinitely.

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Checklist

• [ ] I have tested it locally
• [ ] I have reviewed and updated any documentation if relevant
• [ ] I am providing new code and test(s) for it

Fixes #