!Please help! Proxmox not booting after upgrade to 9.1.4

thurmansevolution

New Member
Jan 5, 2026
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Hey everyone! I've been using Proxmox for a little under a year, and have been enjoying it very well.

I've been having some pretty big issues with the latest 9.1.4 upgrade on my hardware. First, I would like to share my hardware setup:

Dell Precision 5820
10 core Intel i5 CPU (20 virtual cores)
128 GB RAM
2 NVIDIA Quadro 5800 graphics cards
*Proxmox is installed on a 4TB WD Black PCIe NVMe SSD. I also have 2 16TB WD Red drives on a RAID 1 (hardware level)

When I first installed Proxmox, I installed 8.4, and never really had any issues. When I upgraded to 9.1.4 (and I've done it twice since New Years Day), after reboot, it would make it to the GRUB fine, but after it tries to launch Proxmox, it will first get stuck on "loading initial ramdisk" for awhile, until it eventually gives the output, "CPU16: Watchdog detected hard LOCKUP on cpu 16". While it's stuck on that, I'm not able to access the WebUI, nor able to access the machine via SSH.

This only seems to happen on the 9.1.4 upgrade. When I originally upgraded from 8.4.1 to 9.1.4 (and I did run pve8to9 --full and cleared any warnings/failures before upgrading), I was able to upgrade and access the WebUI and it seemed to work with no issues until it was rebooted. The way that was fixed was installing the 9.1.1 iso that I downloaded and flashed to a USB drive. While it was 9.1.1, I rebooted it a few times and had no issues. I noticed recently that it had updated to 9.1.4...and when I rebooted a moment ago, that's when it failed for the second time.

I wish I can update any files or logs, but I' m not able to access anything in my machine. Thank you for any help in advance! :)
 
This may be due to a problem with the newest kernel installed in the update. Try to boot the older one and stick with it.
 
I have had the exact same issue today after updating to 9.1.4. Pinning the previous kernel fixed the issue:
proxmox-boot-tool kernel pin 6.17.2-2-pve
proxmox-boot-tool refresh
 
It seems not many users have this problem as this thread only has a couple of replies. Perhaps it is related to a certain system configuration?

My system is quite similar to the one of the TS. Dell Inspiron Desktop 3030, Intel i7 14700F, Nvidia RTX4060
 
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Just upgraded to 9.1.4, thankfully without any issues.
It does indeed seem to be failing for a select few people.
Thanks!
 
could one of you please provide the journal for a failed boot using the problematic kernel? or if there isn't one, collect console output via netconsole/serial console? thanks!