Re: Issue breaks Virtual Box again. Worked recently, but yesterday it started getting kernel panics on all VMs.

On 22 Jun 2026 at 22:20, C Linus Hicks wrote:

Subject:        	Re: Issue breaks Virtual Box again. Worked 
recently, but yesterday
	it started getting kernel panics on all VMs.
From:           	C Linus Hicks <[email protected]>
To:             	Community support for Fedora users 
<[email protected]>
Date sent:      	Mon, 22 Jun 2026 22:20:06 -0400
Send reply to:  	Community support for Fedora users 
<[email protected]>

> On Mon, 2026-06-22 at 19:00 -0700, Samuel Sieb wrote:
> > On 6/22/26 6:52 PM, Michael D. Setzer II via users wrote:
> > > Solution was to block kvm stuff.
> > > Before had blocked the kvm and it worked.
> > > Then VirtualBox made it to work, but now something changed.
> > > Earlier fix didn't work, so had to do the new blacklist to get it to
> > > work.
> > > 
> > > New blacklist.
> > > cat no-kvm-panic.conf
> > > blacklist kvm_intel
> > > blacklist kvm
> > > blacklist irqbypass
> > 
> > So what does VirtualBox use if not kvm?
> 
> The build supplied by Oracle builds its own module for that. I abandoned that build a couple of
> months ago because of the kernel incompatibility issues when running the latest Fedora kernels and
> started installing from RPM Fusion and was pleasantly surprised when I discovered it uses the kvm
> driver.

I use the RPM Fusion one, and it was working until yesterday with 
the kvm and kvm_intel enable. Had been a few days since I last 
used it, but yesterday, started getting kernel panics with any VM 
load, and required a hard power button restart.

Think it is the new irqbypass that cases issue, but don't know 
exactly. just used google.com ai to get info, and that was the fix.
don't have kvm or other ones. Just use vitural box to test builds of 
my g4l images that have 13M kernel and 26M initramfs. Are using 
7x kernels. AI mentioned something about kernel 6.12 and above 
had a change. So might still work if using older kernels.

If you haven't actually tried it recently, might want to check, but 
make sure anything is saved. For me, it gave a kernel panic, and 
only pressing and holding on power button would get machine to 
respond.

> -- 
> _______________________________________________
> users mailing list -- [email protected]
> To unsubscribe send an email to [email protected]
> Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/
> List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines
> List Archives: https://lists.fedoraproject.org/archives/list/[email protected]
> Do not reply to spam, report it: https://forge.fedoraproject.org/infra/tickets/issues/new


+------------------------------------------------------------+
 Michael D. Setzer II - Computer Science Instructor (Retired)     
 mailto:[email protected]                            
 mailto:[email protected]
 mailto:[email protected]
 Guam - Where America's Day Begins                        
 G4L Disk Imaging Project maintainer 
 http://sourceforge.net/projects/g4l/
+------------------------------------------------------------+



-- 
_______________________________________________
users mailing list -- [email protected]
To unsubscribe send an email to [email protected]
Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/
List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines
List Archives: https://lists.fedoraproject.org/archives/list/[email protected]
Do not reply to spam, report it: https://forge.fedoraproject.org/infra/tickets/issues/new