Re: [PATCH] mm/madvise: preserve uprobe breakpoints across MADV_DONTNEED

Oleg Nesterov
2026-04-29T15:24:45Z

On 04/29, David Hildenbrand (Arm) wrote:
>
> On 4/29/26 15:15, Darko Tominac wrote:
>
> > uprobe infrastructure does not re-instrument pages on individual page
> > faults (uprobe_mmap() is only called during VMA creation, not on
> > page-in), the breakpoints are silently lost once the discarded pages are
> > re-read from the backing file. The probes stop firing with no error
> > indication, and the only recovery is to unregister and re-register the
> > affected uprobes.
>
> Right. Don't MADV_DONTNEED uprobes, just like you are not supposed to
> MADV_DONTNEED debugger breakpoints/set data etc. :)

Agreed, thanks.

Oleg.