[PATCH v3] tools/mm: add hwpoison-panic tool

[Breno Leitao]

On Wed, Nov 04, 2026 at 03:35:16PM +0100, David Hildenbrand (Arm) wrote:
> On 8/13/26 13:45, Breno Leitao wrote:
> > Add a tool that enables the vm.panic_on_unrecoverable_memory_failure
> > sysctl, picks a kernel-owned PFN and writes its physical address to
> > hard_offline_page.  Three page kinds are selectable with -k: rodata
> > (default), slab or pgtable. In all cases the host should panic.
> > 
> > Example:
> > 
> >         # ./hwpoison-panic -k slab --yes-panic-my-kernel
> >         injecting hwpoison at phys 0x100032000 (pfn 0x100032, kind=slab)
> >         expecting kernel panic: 'Memory failure: <pfn>: unrecoverable page'
> > 
> > In dmesg, you will see:
> > 
> >         Memory failure: 0x100032: unhandlable page.
> >         Memory failure: 0x100032: recovery action for reserved kernel page: Ignored
> >         Kernel panic - not syncing: Memory failure: 0x100032: unrecoverable page
> > 
> > This lives in tools/mm rather than selftests/mm because every successful
> > run crashes the machine, which is not something to run from CI.
> > 
> > The --yes-panic-my-kernel argument is required so an accidental
> > invocation does not take the box down.
> 
> This is not upstream yet, right?

Right. :-(

> Anything missing or is this good to go in?

I would say this is good to go, David.

--breno