Re: [PATCH v8 14/21] mm/mmap: Avoid zeroing vma tree in mmap_region()

[Lorenzo Stoakes]

On Fri, Oct 04, 2024 at 11:35:44AM +0200, Bert Karwatzki wrote:
> Here's the log procduced by this kernel:
>
> c9e7f76815d3 (HEAD -> maple_tree_debug_4) hack: set of info stuff v5
> 7e3bb072761a mm: correct error handling in mmap_region()
> 77df9e4bb222 (tag: next-20241001, origin/master, origin/HEAD, master) Add linux-next specific files for 20241001
>
> Again it took two attempts to trigger the bug.
>
> Bert Karwatzki
>

Sending an updated, cleaned up version of the patch with a lot of
explanation. This is functionally identical to the v3 fix I already sent so
you can try that or this to confirm it resolves your issue.

If you are able to do so, I can submit this to upstream for a hotfix. If
not, well then back to the drawing board and I'd be very shocked :)

I have been able to reproduce the issue locally in our userland testing
suite entirely consistently, and this patch resolves the issue and also
continues to pass all maple tree unit tests.

Again thank you so much for all your help - I hope you are able to find a
spare moment to quickly give this one a try and confirm whether it does
indeed address the problem you've reported.

Thanks, Lorenzo

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