Proxmox 6 / Debian 10 / 5.0.21-4-pve and 5.3.7-1-pve kernels doesn't survive reboot

Kubicz

Kubicz

Member
Proxmox Subscriber
Mar 27, 2017
23
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Continue in new thread after posting to https://forum.proxmox.com/threads/p...ests-to-reboot-loop-on-older-intel-cpus.59377

--

Let me share part of my current pain in the ass with one of our Dedicated servers at Hetzner (PX92).

Scenario: I am trying to run stable Debian 10 OS under Proxmox 6. What differs from other involved in this thread is that my CPU is quite new (Intel® Xeon® W-2145 Octa-Core Skylake W).

I am installing fresh Debian 10 from netinst as I cannot boot Proxmox ISO directly at Hetzner. Fresh Debian 10 with kernel 4.19.0-4 is the only kernel so far which survives host reboot.

In first iteration I have followed manual install guide to deploy buggy kernel 5.0.21-4-pve. With this one, host doesn't survive the reboot and ends with blinking cursor. Then I went through this thread and in second iteration I have installed manually 5.3.7-1-pve, removed 5.0.21-4-pve, grub-update and it doesn't survive the reboot, but behavior is different - no cursor at all. :)

Hetzner Support only help regarding this issue is the recommendation to kernel 4.19.x branch, which in my view means downgrade from Proxmox 6 to Proxmox 5 which is not a solution for us ATM.

Many thanks for any fruitful hints!

--

First hint from t.lamprecht:

Can you try to first remove any "quiet" from /etc/default/grub (the GRUB_CMDLINE_LINUX variable) and run update-grub, this should give you hopefully a bit more than a blinking cursor.

Then, there's a newer 5.3.10 based kernel available, also worth a try.
 
Thanks Thomas for a hint!

My /etc/default/grub is pretty minimalistic see:

Code: 
GRUB_DEFAULT=0
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="nomodeset consoleblank=0"
GRUB_CMDLINE_LINUX=""

I can definitely try the kernel 5.3.10, but I will wait for your follow up not to hurry things up.

For investigation see my /boot/grub/grub.cfg:

Code: 
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
  set have_grubenv=true
  load_env
fi
if [ "${next_entry}" ] ; then
   set default="${next_entry}"
   set next_entry=
   save_env next_entry
   set boot_once=true
else
   set default="0"
fi

if [ x"${feature_menuentry_id}" = xy ]; then
  menuentry_id_option="--id"
else
  menuentry_id_option=""
fi

export menuentry_id_option

if [ "${prev_saved_entry}" ]; then
  set saved_entry="${prev_saved_entry}"
  save_env saved_entry
  set prev_saved_entry=
  save_env prev_saved_entry
  set boot_once=true
fi

function savedefault {
  if [ -z "${boot_once}" ]; then
    saved_entry="${chosen}"
    save_env saved_entry
  fi
}
function load_video {
  if [ x$feature_all_video_module = xy ]; then
    insmod all_video
  else
    insmod efi_gop
    insmod efi_uga
    insmod ieee1275_fb
    insmod vbe
    insmod vga
    insmod video_bochs
    insmod video_cirrus
  fi
}

if [ x$feature_default_font_path = xy ] ; then
   font=unicode
else
insmod part_msdos
insmod ext2
set root='hd2,msdos3'
if [ x$feature_platform_search_hint = xy ]; then
  search --no-floppy --fs-uuid --set=root --hint-bios=hd2,msdos3 --hint-efi=hd2,msdos3 --hint-baremetal=ahci2,msdos3  99cdd5d5-b7fe-4391-a959-baeb498300c0
else
  search --no-floppy --fs-uuid --set=root 99cdd5d5-b7fe-4391-a959-baeb498300c0
fi
    font="/usr/share/grub/unicode.pf2"
fi

if loadfont $font ; then
  set gfxmode=auto
  load_video
  insmod gfxterm
  set locale_dir=$prefix/locale
  set lang=en_US
  insmod gettext
fi
terminal_output gfxterm
if [ "${recordfail}" = 1 ] ; then
  set timeout=30
else
  if [ x$feature_timeout_style = xy ] ; then
    set timeout_style=menu
    set timeout=5
  # Fallback normal timeout code in case the timeout_style feature is
  # unavailable.
  else
    set timeout=5
  fi
fi
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/05_debian_theme ###
set menu_color_normal=cyan/blue
set menu_color_highlight=white/blue
### END /etc/grub.d/05_debian_theme ###

### BEGIN /etc/grub.d/10_linux ###
function gfxmode {
        set gfxpayload="${1}"
}
set linux_gfx_mode=
export linux_gfx_mode
menuentry 'Debian GNU/Linux' --class debian --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-99cdd5d5-b7fe-4391-a959-baeb498300c0' {
        load_video
        insmod gzio
        if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
        insmod part_msdos
        insmod ext2
        set root='hd2,msdos2'
        if [ x$feature_platform_search_hint = xy ]; then
          search --no-floppy --fs-uuid --set=root --hint-bios=hd2,msdos2 --hint-efi=hd2,msdos2 --hint-baremetal=ahci2,msdos2  0d0574b8-3c70-4d93-a924-a946f6150a4d
        else
          search --no-floppy --fs-uuid --set=root 0d0574b8-3c70-4d93-a924-a946f6150a4d
        fi
        echo    'Loading Linux 5.3.7-1-pve ...'
        linux   /vmlinuz-5.3.7-1-pve root=UUID=99cdd5d5-b7fe-4391-a959-baeb498300c0 ro  nomodeset consoleblank=0
        echo    'Loading initial ramdisk ...'
        initrd  /initrd.img-5.3.7-1-pve
}
submenu 'Advanced options for Debian GNU/Linux' $menuentry_id_option 'gnulinux-advanced-99cdd5d5-b7fe-4391-a959-baeb498300c0' {
        menuentry 'Debian GNU/Linux, with Linux 5.3.7-1-pve' --class debian --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.3.7-1-pve-advanced-99cdd5d5-b7fe-4391-a959-baeb498300c0' {
                load_video
                insmod gzio
                if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
                insmod part_msdos
                insmod ext2
                set root='hd2,msdos2'
                if [ x$feature_platform_search_hint = xy ]; then
                  search --no-floppy --fs-uuid --set=root --hint-bios=hd2,msdos2 --hint-efi=hd2,msdos2 --hint-baremetal=ahci2,msdos2  0d0574b8-3c70-4d93-a924-a946f6150a4d
                else
                  search --no-floppy --fs-uuid --set=root 0d0574b8-3c70-4d93-a924-a946f6150a4d
                fi
                echo    'Loading Linux 5.3.7-1-pve ...'
                linux   /vmlinuz-5.3.7-1-pve root=UUID=99cdd5d5-b7fe-4391-a959-baeb498300c0 ro  nomodeset consoleblank=0
                echo    'Loading initial ramdisk ...'
                initrd  /initrd.img-5.3.7-1-pve
        }
        menuentry 'Debian GNU/Linux, with Linux 5.3.7-1-pve (recovery mode)' --class debian --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.3.7-1-pve-recovery-99cdd5d5-b7fe-4391-a959-baeb498300c0' {
                load_video
                insmod gzio
                if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
                insmod part_msdos
                insmod ext2
                set root='hd2,msdos2'
                if [ x$feature_platform_search_hint = xy ]; then
                  search --no-floppy --fs-uuid --set=root --hint-bios=hd2,msdos2 --hint-efi=hd2,msdos2 --hint-baremetal=ahci2,msdos2  0d0574b8-3c70-4d93-a924-a946f6150a4d
                else
                  search --no-floppy --fs-uuid --set=root 0d0574b8-3c70-4d93-a924-a946f6150a4d
                fi
                echo    'Loading Linux 5.3.7-1-pve ...'
                linux   /vmlinuz-5.3.7-1-pve root=UUID=99cdd5d5-b7fe-4391-a959-baeb498300c0 ro single
                echo    'Loading initial ramdisk ...'
                initrd  /initrd.img-5.3.7-1-pve
        }
        menuentry 'Debian GNU/Linux, with Linux 4.19.0-6-amd64' --class debian --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.19.0-6-amd64-advanced-99cdd5d5-b7fe-4391-a959-baeb498300c0' {
                load_video
                insmod gzio
                if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
                insmod part_msdos
                insmod ext2
                set root='hd2,msdos2'
                if [ x$feature_platform_search_hint = xy ]; then
                  search --no-floppy --fs-uuid --set=root --hint-bios=hd2,msdos2 --hint-efi=hd2,msdos2 --hint-baremetal=ahci2,msdos2  0d0574b8-3c70-4d93-a924-a946f6150a4d
                else
                  search --no-floppy --fs-uuid --set=root 0d0574b8-3c70-4d93-a924-a946f6150a4d
                fi
                echo    'Loading Linux 4.19.0-6-amd64 ...'
                linux   /vmlinuz-4.19.0-6-amd64 root=UUID=99cdd5d5-b7fe-4391-a959-baeb498300c0 ro  nomodeset consoleblank=0
                echo    'Loading initial ramdisk ...'
                initrd  /initrd.img-4.19.0-6-amd64
        }
        menuentry 'Debian GNU/Linux, with Linux 4.19.0-6-amd64 (recovery mode)' --class debian --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.19.0-6-amd64-recovery-99cdd5d5-b7fe-4391-a959-baeb498300c0' {
                load_video
                insmod gzio
                if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
                insmod part_msdos
                insmod ext2
                set root='hd2,msdos2'
                if [ x$feature_platform_search_hint = xy ]; then
                  search --no-floppy --fs-uuid --set=root --hint-bios=hd2,msdos2 --hint-efi=hd2,msdos2 --hint-baremetal=ahci2,msdos2  0d0574b8-3c70-4d93-a924-a946f6150a4d
                else
                  search --no-floppy --fs-uuid --set=root 0d0574b8-3c70-4d93-a924-a946f6150a4d
                fi
                echo    'Loading Linux 4.19.0-6-amd64 ...'
                linux   /vmlinuz-4.19.0-6-amd64 root=UUID=99cdd5d5-b7fe-4391-a959-baeb498300c0 ro single
                echo    'Loading initial ramdisk ...'
                initrd  /initrd.img-4.19.0-6-amd64
        }
}

### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_linux_xen ###

### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/30_os-prober ###
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/30_uefi-firmware ###
### END /etc/grub.d/30_uefi-firmware ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f  ${config_directory}/custom.cfg ]; then
  source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f  $prefix/custom.cfg ]; then
  source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###
 
Last edited:
Do you have another machine in the same subnet available per chance? You could use netconsole to log the kernel output directly to another machine for debugging purpose.
 
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