linux-kernel - Re: [PATCH v6 00/71] Introducing the Maple Tree

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Date:   Fri, 25 Feb 2022 16:00:34 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Qian Cai <quic_qiancai@...cinc.com>
Cc:     Liam Howlett <liam.howlett@...cle.com>,
        "maple-tree@...ts.infradead.org" <maple-tree@...ts.infradead.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH v6 00/71] Introducing the Maple Tree

On Fri, Feb 25, 2022 at 03:46:52PM -0500, Qian Cai wrote:
> On Fri, Feb 25, 2022 at 08:23:41PM +0000, Liam Howlett wrote:
> > I just booted an arm64 VM with my build and kasan enabled with no issue.
> > Could you please send me your config file for the build?
> 
> On linux-next, I just do:
> 
> $ make arch=arm64 defconfig debug.config [1]
> 
> Then, I just generate some memory pressume into swapping/OOM Killer to
> trigger it.
> 
> [1] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/kernel/configs/debug.config

Is the stacktrace [1] related to the conflict that Mark encountered [2]
while merging the maple and folio trees? Booting a next-20220223 kernel
on my Raspberry Pi 3 and 4 shows constant NULL pointer dereferences
(just ARCH=arm and ARCH=arm64 defconfigs) and reverting the folio and
maple tree merges makes everything work properly again.

[1]: https://lore.kernel.org/r/YhhRrBpXTFolUAKi@qian/
[2]: https://lore.kernel.org/r/20220224011653.1380557-1-broonie@kernel.org/

Cheers,
Nathan