From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 79FA71AA1DC; Wed, 18 Dec 2024 18:06:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734545205; cv=none; b=u+oa0LbRXvDiM/yxueq7YzI6LZntw5wz9duQ5XtMRyXmhcUGyiGsekVCsRrkcig4/CgEruwzAK4lZtVy4Y10i7+WTY9KlkKhA9v1X6x2OjV8d7b5Qy2x2mFB+TBlDGTVwxpIroeeCXxFDrBLbMZjDhnbndMxS9dlb63A8nnXgGQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734545205; c=relaxed/simple; bh=HtZvE9r1p96XpGdU4CxFFXQTsUZba8DZZF56FVc4JDs=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=CKCyou7AFAGZ05J8gXYGtPka5J2Smk+/Qe9duD6lTqPtU3HZS1k8tB5xzNGZ1vmeOtflbMoIk6d1bDQlLV6OUZ1D1D8jn4In3PyzSt5K2bSAC57D1/NNppw69aWb9K8Uh3K3/gT2zZIpwzIVH/w/3Yev/NshHd8j/nc01IySOsU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=qmIAfwgj; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="qmIAfwgj" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0999DC4CECD; Wed, 18 Dec 2024 18:06:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1734545205; bh=HtZvE9r1p96XpGdU4CxFFXQTsUZba8DZZF56FVc4JDs=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=qmIAfwgjFmTqob+IDlOLIri0xDGzskdodSiFlgBEO5dxigCDq0rY0IWFHJKkF45uF TitIIj9HG690RC12HrOTZyb9OiUZkpdHXKJuaX+pcJYEyWQfam6cbmT4rXubuQNz1J zWeuK0YoIOz4Uk+2V6BarhRiw099SliGpXEMzWnMiRe6rrwlnKXw6Bvbj1ycdHVqdG jh2GI8mgRTDlwaAv1+pTbsucoWNuKKjmy23qWAQDlm12Tas4XIF//lU3QzKqNuj6Ks x8OaVauEWVKYEq95gxDkVnOykd9P+4mrP23fumlX+7GEY5jISZJtMtp1F09LkOmiJc WlXNUizdo/TJw== Message-ID: Date: Wed, 18 Dec 2024 19:06:32 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Beta Subject: Re: [syzbot] [net?] general protection fault in put_page (4) Content-Language: en-GB To: Eric Dumazet Cc: davem@davemloft.net, dsahern@kernel.org, horms@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, martineau@kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzbot , syzkaller-bugs@googlegroups.com References: <6761aed9.050a0220.29fcd0.006b.GAE@google.com> From: Matthieu Baerts Autocrypt: addr=matttbe@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit Hi Eric, On 17/12/2024 18:06, Eric Dumazet wrote: > On Tue, Dec 17, 2024 at 6:03 PM syzbot > wrote: >> >> Hello, >> >> syzbot found the following issue on: >> >> HEAD commit: 78d4f34e2115 Linux 6.13-rc3 >> git tree: upstream >> console+strace: https://syzkaller.appspot.com/x/log.txt?x=16445730580000 >> kernel config: https://syzkaller.appspot.com/x/.config?x=6c532525a32eb57d >> dashboard link: https://syzkaller.appspot.com/bug?extid=38a095a81f30d82884c1 >> compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 >> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=169b0b44580000 >> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13f502df980000 >> >> Downloadable assets: >> disk image: https://storage.googleapis.com/syzbot-assets/7129ee07f8aa/disk-78d4f34e.raw.xz >> vmlinux: https://storage.googleapis.com/syzbot-assets/c23c0af59a16/vmlinux-78d4f34e.xz >> kernel image: https://storage.googleapis.com/syzbot-assets/031aecf04ea7/bzImage-78d4f34e.xz >> >> The issue was bisected to: >> >> commit b83fbca1b4c9c45628aa55d582c14825b0e71c2b >> Author: Matthieu Baerts (NGI0) >> Date: Mon Sep 2 10:45:53 2024 +0000 >> >> mptcp: pm: reduce entries iterations on connect >> >> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=163682df980000 >> final oops: https://syzkaller.appspot.com/x/report.txt?x=153682df980000 >> console output: https://syzkaller.appspot.com/x/log.txt?x=113682df980000 (...) > I spent some time on this bug before releasing it, because I have > other syzbot reports probably > caused by the same issue, hinting at shinfo->nr_frags corruption. > > I will hold these reports to avoid flooding the mailing list. Thank you for having released this bug report! The bisected commit looks unrelated. I don't know if we can tell syzbot to "skip this commit and try harder". I'm trying to run a 'git bisect' on my side since this morning: the issue seems to be older, between v6.10 and v6.11 if I'm not mistaken. When using the same kernel config, I'm getting quite a few issues on older commits (compilation, other warnings, etc.), plus the compilation is slow on my laptop. I will update you if I can find anything useful. Cheers, Matt -- Sponsored by the NGI0 Core fund.