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I have to mantain some LAN, legacy servers, with Centos 6.10 64 bit. They are virtualized under HyperV and all is working fine until the last kernel update (2.6.32-754.22.1).

Problem: something is broken, the servers boot but with the old kernel 2.6.32-754.18.2.

This is the configuration of one of the servers, they are similar except for the size of the partitions.

I hope these info are sufficient to troubleshoot what's wrong.

Linux dummy.local 2.6.32-754.18.2.el6.x86_64 #1 SMP Wed Aug 14 16:26:59 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

/etc/grub.conf

default=0
title CentOS (2.6.32-754.22.1.el6.x86_64)
     root (hd0,1)
     kernel /vmlinuz-2.6.32-754.22.1.el6.x86_64 ro root=/dev/sda3 ...
title CentOS (2.6.32-754.18.2.el6.x86_64)
    root (hd0,1)
    kernel /vmlinuz-2.6.32-754.18.2.el6.x86_64 ro root=/dev/sda3 ...

/etc/fstab

/dev/sda1               /boot/efi               vfat   
/dev/sda2               /boot                   ext4
/dev/sda3               /                       ext4

parted -l /dev/sda

Model: Msft Virtual Disk (scsi)
Disk /dev/sda: 68.7GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt

Number  Start   End     Size    File system  Name  Flags
 1      1049kB  135MB   134MB   fat16              boot
 2      135MB   404MB   268MB   ext4
 3      404MB   68.7GB  68.3GB  ext4

efibootmgr -v

BootCurrent: 0003
BootOrder: 0003,0002,0001,0000
Boot0000* EFI Network   02021800000000000000000000000000564d427573000000Vendor(9b17e5a2-0891-42dd-b653-80b5c22809ba,635161f83edfc546913ff2d2f965ed0e05ac469414350a44b0c8bae00e97f4d2)MAC(000000000000,0)
Boot0001* EFI SCSI Device       02021800000000000000000000000000564d427573000000Vendor(9b17e5a2-0891-42dd-b653-80b5c22809ba,d96361baa104294db60572e2ffb1dc7f70289ca494439541874c91180eeaf036)SCSI(0,0)
Boot0002* EFI SCSI Device       02021800000000000000000000000000564d427573000000Vendor(9b17e5a2-0891-42dd-b653-80b5c22809ba,d96361baa104294db60572e2ffb1dc7f70289ca494439541874c91180eeaf036)SCSI(0,1)
Boot0003* CentOS 6      HD(1,800,40000,c0ca09aa-c748-4c47-a67a-846f5e9a5b98)File(\EFI\redhat\grub.efi)

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