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Wed, 26 Nov 2025 03:29:03 -0800 (PST) Date: Wed, 26 Nov 2025 03:29:03 -0800 In-Reply-To: <69260882.a70a0220.d98e3.00b4.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6926e47f.a70a0220.d98e3.00d1.GAE@google.com> Subject: Forwarded: Re: [syzbot] [net?] divide error in __tcp_select_window (4) From: syzbot To: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org. *** Subject: Re: [syzbot] [net?] divide error in __tcp_select_window (4) Author: matttbe@kernel.org Hello, (Without other ML's to test a different fix) On 25/11/2025 20:50, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: e2c20036a887 Merge branch 'devlink-net-mlx5-implement-swp_.. > git tree: net-next > console output: https://syzkaller.appspot.com/x/log.txt?x=1164c484580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=a881ccda32df4e75 > dashboard link: https://syzkaller.appspot.com/bug?extid=3a92d359bc2ec6255a33 > compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13f8fa12580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=113a5a12580000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/07279e689a07/disk-e2c20036.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/b13e2e59c1ed/vmlinux-e2c20036.xz > kernel image: https://storage.googleapis.com/syzbot-assets/f6f519394597/bzImage-e2c20036.xz > > The issue was bisected to: > > commit ae155060247be8dcae3802a95bd1bdf93ab3215d > Author: Paolo Abeni > Date: Tue Nov 18 07:20:24 2025 +0000 > > mptcp: fix duplicate reset on fastclose > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11f698b4580000 > final oops: https://syzkaller.appspot.com/x/report.txt?x=13f698b4580000 > console output: https://syzkaller.appspot.com/x/log.txt?x=15f698b4580000 > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+3a92d359bc2ec6255a33@syzkaller.appspotmail.com > Fixes: ae155060247b ("mptcp: fix duplicate reset on fastclose") I *think* this issue might have been fixed by another patch that has been sent recently, see "mptcp: clear scheduled subflows on retransmit": #syz test: git://git.kernel.org/pub/scm/linux/kernel/git/matttbe/net-next.git b4/net-mptcp-clear-sched-rtx Cheers, Matt -- Sponsored by the NGI0 Core fund.