linux-kernel - Re: [Regression] mmap with MAP_32BIT randomly fails since 6.1

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Date:   Fri, 3 Mar 2023 09:31:39 +0100
From:   "Linux regression tracking #adding (Thorsten Leemhuis)" 
        <regressions@...mhuis.info>
To:     Snild Dolkow <snild@...y.com>,
        "Liam R. Howlett" <Liam.Howlett@...cle.com>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc:     "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        "maple-tree@...ts.infradead.org" <maple-tree@...ts.infradead.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [Regression] mmap with MAP_32BIT randomly fails since 6.1

[TLDR: I'm adding this report to the list of tracked Linux kernel
regressions; the text you find below is based on a few templates
paragraphs you might have encountered already in similar form.
See link in footer if these mails annoy you.]

On 02.03.23 16:32, Snild Dolkow wrote:
> After upgrading a machine from 5.17.4 to 6.1.12 a couple of weeks ago, I
> started getting (inconsistent) failures when building Android:
> [...]
> I have checked a more recent master commit (ee3f96b1, from March 1st),
> and the problem is still there. Bisecting shows that e15e06a8 is the
> last good commit, and that 524e00b3 is the first one failing in this
> way. The 10 or so commits in between run into a page fault BUG down in
> vma_merge() instead.
> 
> This range of commits is about the same as mentioned in
> https://lore.kernel.org/lkml/0b9f5425-08d4-8013-aa4c-e620c3b10bb2@leemhuis.info/, so I assume that my problem, too, was introduced with the Maple Tree changes. Sending this to the same people and lists.
> 

Thanks for the report. To be sure the issue doesn't fall through the
cracks unnoticed, I'm adding it to regzbot, the Linux kernel regression
tracking bot:

#regzbot ^introduced e15e06a8..524e00b3
#regzbot title mm: mmap with MAP_32BIT randomly fails since 6.1
#regzbot ignore-activity

This isn't a regression? This issue or a fix for it are already
discussed somewhere else? It was fixed already? You want to clarify when
the regression started to happen? Or point out I got the title or
something else totally wrong? Then just reply and tell me -- ideally
while also telling regzbot about it, as explained by the page listed in
the footer of this mail.

Developers: When fixing the issue, remember to add 'Link:' tags pointing
to the report (the parent of this mail). See page linked in footer for
details.

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
--
Everything you wanna know about Linux kernel regression tracking:
https://linux-regtracking.leemhuis.info/about/#tldr
That page also explains what to do if mails like this annoy you.