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Thu, 8 Jan 2026 08:12:09 -0500 (EST) Date: Thu, 8 Jan 2026 14:12:06 +0100 From: Greg KH To: Christoph Biedl Cc: stable@vger.kernel.org, Martin Nybo Andersen , Masahiro Yamada Subject: Re: 6.1 Backport request: fbf5892df21a ("kbuild: Use CRC32 and a 1MiB dictionary for XZ compressed modules") Message-ID: <2026010853-possible-guzzler-62d5@gregkh> References: <1766658651@msgid.manchmal.in-ulm.de> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1766658651@msgid.manchmal.in-ulm.de> On Thu, Dec 25, 2025 at 11:48:03AM +0100, Christoph Biedl wrote: > Hello, > > please backport > > commit fbf5892df21a8ccfcb2fda0fd65bc3169c89ed28 > Author: Martin Nybo Andersen > Date: Fri Sep 15 12:15:39 2023 +0200 > > kbuild: Use CRC32 and a 1MiB dictionary for XZ compressed modules > > Kmod is now (since kmod commit 09c9f8c5df04 ("libkmod: Use kernel > decompression when available")) using the kernel decompressor, when > loading compressed modules. > > However, the kernel XZ decompressor is XZ Embedded, which doesn't > handle CRC64 and dictionaries larger than 1MiB. > > Use CRC32 and 1MiB dictionary when XZ compressing and installing > kernel modules. > > to the 6.1 stable kernel, and possibly older ones as well. > > The commit message actually has it all, so just my story: There's a > hardware that has or had issues with never kernels (no time to check), > my kernel for this board is usually static. But after building a kernel > with xz-compressed modules, they wouldn't load but trigger > "decompression failed with status 6". Investigation led to a CRC64 check > for these files, and eventually to the above commit. > > The commit applies (with an offset), the resulting modules work as > expected. > > Kernel 6.6 and newer already have that commit. Older kernels could > possibly benefit from this as well, I haven't checked. Now queued up, thanks. greg k-h