Re: amd64 -current GENERIC.MP: panic "dupe == NULL" in uvm_page

On Tue, May 19, 2026 at 11:55:10AM -0700, Mike Larkin wrote:
> From: Mike Larkin <[email protected]>
> To: [email protected]
> Cc: [email protected]
> Subject: Re: amd64 -current GENERIC.MP: panic "dupe == NULL" in uvm_page
> Date: Tue, 19 May 2026 11:55:10 -0700
> 
> On Tue, May 19, 2026 at 08:49:19PM +0200, [email protected] wrote:
> > Kernel diagnostic assertion in sys/uvm/uvm_page.c line 144 fired
> > from a userspace page fault.
> >
> > Running kernel is snapshot from today, but I have been able to replicate on
> > 7.9-beta:
> >
> >     OpenBSD 7.9-current (GENERIC.MP) #492: Mon May 18 08:55:04 MDT 2026
> >         [email protected]:/usr/src/sys/arch/amd64/compile/GENERIC.MP
> >
> > The machine is a VMware Workstation guest, 4 vCPUs, vmm(4)
> > loaded with VMX/EPT. At the time of the panic vmd(8) was running a
> > single nested vmm guest ("tmpinstall", 1G memory).
> >
> 
> what failed here though?
> 
> the outer VM or the inner one?
> 
Ah, yes sorry, I should have been clearer. The failing one is the vmm server,
so the machine running under VMware. But it crashed only after starting a
vmm VM under that VMware machine.

linux with VMware Workstation
     -> OpenBSD master VM (crashed)
          -> OpenBSD vmm VMs (can't say if they crashed first)