[FS#4176] Crashing or rebooting early in boot on x86_64

OpenWrt Bugs openwrt-bugs at lists.openwrt.org
Sat Dec 4 13:12:48 PST 2021


A new Flyspray task has been opened.  Details are below. 

User who did this - ShadowFlare (ShadowFlare) 

Attached to Project - OpenWrt/LEDE Project
Summary - Crashing or rebooting early in boot on x86_64
Task Type - Bug Report
Category - Kernel
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Critical
Priority - Very Low
Reported Version - openwrt-21.02
Due in Version - Undecided
Due Date - Undecided
Details - I hadn't updated my VM in a while, so sorry for finding this so late.

I have a VM on Hyper-V Server 2019 that had been running OpenWrt 21.02 RC3 on x86_64 with EFI and using squashfs as the rootfs type in a generation 2 (EFI-supporting) Hyper-V VM, and recently I tried updating to a build of 21.02.1. Very early in boot (after Grub, while OpenWrt is booting) it just reboots, and keeps doing this repeatedly. I tried to watch for any error message flashing on the screen just before the reboot, but I couldn't spot anything, and also the failsafe option from the boot menu doesn't help.

I've tested this with a fresh clean install without my configs on a new virtual hard drive, and the problem still occurs. Other than my own build of 21.02.1, I've found it happens on the official builds, too. I checkpointed the VM and started testing official builds, finding that it started with 21.02 release (RC4 was fine) and it continues through to 21.02.1 and also a snapshot build from master that I tried.

I skimmed through the few commits between RC4 and 21.02 release and found this commit affecting x86_64:


After reverting the change in my local tree, rebuilding 21.02.1, and installing the image on my VM, it boots successfully with no problems.

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