linux-kernel - Re: [PATCH v4 14/21] mm/mmap: Avoid zeroing vma tree in mmap

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Message-ID: <hdmrqvvszg3fmvc6qtmia42y2d7gfpsqrp7totg6pibidyj3rr@eaze3r45vx4f>
Date: Wed, 17 Jul 2024 13:42:37 -0400
From: "Liam R. Howlett" <Liam.Howlett@...cle.com>
To: kernel test robot <oliver.sang@...el.com>
Cc: oe-lkp@...ts.linux.dev, lkp@...el.com, linux-mm@...ck.org,
        ltp@...ts.linux.it, Andrew Morton <akpm@...ux-foundation.org>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>, Lorenzo Stoakes <lstoakes@...il.com>,
        Matthew Wilcox <willy@...radead.org>, sidhartha.kumar@...cle.com,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Bert Karwatzki <spasswolf@....de>, Jiri Olsa <olsajiri@...il.com>,
        linux-kernel@...r.kernel.org, Kees Cook <kees@...nel.org>
Subject: Re: [PATCH v4 14/21] mm/mmap: Avoid zeroing vma tree in mmap_region()

* kernel test robot <oliver.sang@...el.com> [240716 08:47]:
> 
> 
> Hello,
> 
> kernel test robot noticed "ltp.hugemmap06.fail" on:

Hello Robot!

Thank you for finding this, it will certainly help me improve my next
revision of my series!

> 
> commit: d793398401db9fb81084bd4fe2f782342201df18 ("[PATCH v4 14/21] mm/mmap: Avoid zeroing vma tree in mmap_region()")
> url: https://github.com/intel-lab-lkp/linux/commits/Liam-R-Howlett/mm-mmap-Correctly-position-vma_iterator-in-__split_vma/20240711-075019
> base: https://git.kernel.org/cgit/linux/kernel/git/akpm/mm.git mm-everything
> patch link: https://lore.kernel.org/all/20240710192250.4114783-15-Liam.Howlett@oracle.com/
> patch subject: [PATCH v4 14/21] mm/mmap: Avoid zeroing vma tree in mmap_region()
> 
> in testcase: ltp
> version: ltp-x86_64-14c1f76-1_20240706
> with following parameters:
> 
> 	test: hugetlb/hugemmap06
> 
> 
> 

This is because I am trying to set up a MAP_FIXED huge page before
hugetlb_vm_op_close() is called, which removes the reserved huge pages.

I will address this in v5.