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List-Subscribe: List-Unsubscribe: On Thu, Jan 01, 2026 at 06:06:23PM +0100, David Hildenbrand (Red Hat) wrote: > On 1/1/26 17:32, Lorenzo Stoakes wrote: > > On Thu, Jan 01, 2026 at 11:30:52PM +0900, Jeongjun Park wrote: > > > > > > Based on my testing, I found that the WARNING starts from commit > > > d23cb648e365 ("mm/mremap: permit mremap() move of multiple VMAs"), > > > which is right after commit 2cf442d74216 ("mm/mremap: clean up mlock > > > populate behavior") in Lorenzo's mremap-related patch series. > > > > OK let me take a look. > > Trying to make sense of the reproducer and how bpf comes into play ... I > assume BPF is only used to install a uprobe. > > We seem to create a file0 and register a uprobe on it. > > We then mmap() that file with PROT_NONE. We should end up in uprobe_mmap() > and trigger a COW fault -> allocate an anon_vma. > > So likely the bpf magic is only there to allocate an anon_vma for a > PROT_NONE region. > > But it's all a bit confusing ... :) > > -- > Cheers > > David OK I had a huge reply going through all of Jeongjun's stuff (thanks for reporting!) but then got stuck into theories and highways and byways... all the while I couldn't repro. Well now I can repro reliably, finally! So I will dig into this more tomorrow. Having a reliable repro makes this vastly easier. I have theories... almost tempting to carry on right now but I'll end up not sleeping :) Cheers, Lorenzo