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Date:   Tue, 21 Sep 2021 21:56:32 +0200
From:   David Sterba <dsterba@suse.cz>
To:     Chris Murphy <lists@colorremedies.com>
Cc:     Btrfs BTRFS <linux-btrfs@vger.kernel.org>
Subject: Re: 5.15.0-rc1 armv7hl Workqueue: btrfs-delalloc btrfs_work_helper
 PC is at mmiocpy LR is at ZSTD_compressStream
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On Mon, Sep 20, 2021 at 06:13:07PM -0600, Chris Murphy wrote:
> https://kojipkgs.fedoraproject.org//work/tasks/8820/75928820/oz-armhfp.log

> 00:09:50,679 EMERG kernel:[<c08bd768>] (mmiocpy) from [<c089c314>]
> (ZSTD_compressStream+0x184/0x294)

The last function to fail is inside ZSTD implementation in kernel.
If btrfs passes wrong data to zstd we'd see that also on non-arm builds,
so guessing by mmiocpy as a copy-something function it could be some
sort of alignment problem that works on x86_64 but throws an exception
on arm as it's stricter about alignment.