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	Thu, 15 Oct 2026 16:54:29 -0300
Message-ID: <441cd931c56cb539eb099bf6d976cc59@manguebit.org>
From: Paulo Alcantara <pc@manguebit.org>
To: Paul Aurich <paul@darkrain42.org>, linux-cifs@vger.kernel.org,
 stable@vger.kernel.org, Namjae Jeon <linkinjeon@kernel.org>
Cc: Henrique Carvalho <henrique.carvalho@suse.com>, Sasha Levin
 <sashal@kernel.org>, regressions@lists.linux.dev
Subject: Re: [REGRESSION] smb: client: batch SRV_COPYCHUNK entries to cut
 round trips - 6.12.y EIO above 12 MiB with SMB3 encryption
In-Reply-To: <atEn9dyqsyI3SNaP@redcloak.home.arpa>
References: <atEn9dyqsyI3SNaP@redcloak.home.arpa>
Date: Thu, 15 Oct 2026 16:54:29 -0300
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Thanks for the report.

Paul Aurich <paul@darkrain42.org> writes:

> In stable 6.12.y releases, a copy_file_range request exceeding 12 MiB on an
> encrypted SMB3 mount fails with EIO and a WARN_ON_ONCE() splat in
> SMB2_ioctl_init:
>
>      # cp /mnt/otters/13mib.bin /mnt/otters/output.bin
>      cp: error copying '/mnt/otters/13mib.bin' to '/mnt/otters/output.bin':
>      Input/output error
>
> Works in 6.12.110.  Fails in 6.12.111 through 6.12.113 (latest).  Via
> bisection, introduced by 8d103b285359 ("smb: client: batch SRV_COPYCHUNK
> entries to cut round trips").

Does it work if you backport the other 3 missing commits?