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Mon, 26 Oct 2026 17:51:17 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=eosdev.it; s=list.eosdev.it; t=1793033477; bh=ZxTiioJ6b7RWNBjfsRuabOTUrn9zjNjT2s3ACaZvFcs=; h=Date:From:Subject:To:Cc:From; b=jA0Agd+aGon0Arek3u5MIl7qF8v5O3ewgmXlVBPItezZ5fboVqTEygjwSxGQRW3L2 12IecwNwJS+xP6glvOtYJ+VwSmenQChrmomBjUbkDMkzoydvRaPkiuo6jXyGtJCwU9 mQEIP3B13HbOUlZabLl6eyVLKeNLrZl3Lo44UxNwPshFd2XomImyKA2jDwhaO0I8aN G8nPrrxeVb+3FSFsXEh/p4XHPxSO0r/U3k7ZFVU2BjZgIjxtCujQ/fQ3ApZ6KWA4xu 7XFhMuAWsAlv/+PiGnTGXUI24jvtuEHilv6f6nRziGKJunR2RpXVVqEru4Go/SjPYS hS3RL+kc0QJSg== Message-ID: <50c31a4e-9a41-46bf-9c70-ccbc1ed07b2e@eosdev.it> Date: Mon, 26 Oct 2026 17:51:16 +0100 X-Mailing-List: linux-raid@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: EOS - Manlio Morini Subject: [5.15.y] Request to backport c567c86b90d4 (md/raid10 fstrim kernel crash) To: stable@vger.kernel.org Cc: linux-raid@vger.kernel.org Content-Language: it Autocrypt: addr=morini@eosdev.it; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hello, I'd like to request the backport of the following upstream commit to the Linux 5.15.y stable series: --- c567c86b90d4715081adfe5eb812141a5b6b4883 md: move initialization and destruction of 'io_acct_set' to md.c --- The regression was introduced in 5.15.181 by commit 4a05f7ae3371 ("md/raid10: fix missing discard IO accounting"), which depends on the above commit. Without this prerequisite, running fstrim on an MD RAID10 array can cause a NULL pointer dereference and crash the kernel. I have reproduced this crash on my Slackware workstation running Linux 5.15.223. The issue was independently investigated and fixed by Canonical in Ubuntu's 5.15 kernel: * https://bugs.launchpad.net/bugs/2117395 *https://lists.ubuntu.com/archives/kernel-team/2025-July/161560.html The prerequisite was also backported to the Linux 6.1.y stable series: * https://lists.openwall.net/linux-kernel/2025/05/06/1629 My original report: * https://blog.eosdev.it/2025/07/attenzione-fstrim-su-raid-10-crash-del.html Since this is a reproducible kernel crash caused by a missing dependency of an already backported commit, could the necessary fix also be considered for the 5.15.y stable series? Thank you for your work on maintaining the stable kernels. Best regards, Manlio Morini