From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f208.google.com (mail-oi1-f208.google.com [209.85.167.208]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7EB6D3D522C for ; Thu, 16 Jul 2026 16:50:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.208 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784220639; cv=none; b=qh/vEDzxhr1wllgpP3LUar2J02pl050Wqzn1g6kngb1g6e7+cWCBXSaxc1sUOVsfsUhqWMnwSULrdFPSZxIOUF7BvOR55IKh8AAw6zmYeuQVuLAx9kL/Yw0SgDQuc0ptHWPVtGKFqQ92uLAGW67t+yMiVh+xeIiur/1YX2zy2pA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784220639; c=relaxed/simple; bh=xRnhCY+k7z1dleRqIlO8T/pUtA8zwogHlTW7un2uqqs=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=FrtaRzylh5+NAi7ihmpHVtmLysE2TfCMq/kP+lVgU/P3T428phe2EILMNxikaS54SaKzUI/vEhp6k6CxpUxEVT0EJXeRdGoPQS8G/+B3rizYawZWM3g3H0aV91br3rWt2EeIMVe3kNhCt0DeCAlSNtB2vQKp29BdoPv5k62+DDE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.167.208 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-oi1-f208.google.com with SMTP id 5614622812f47-4959c49e054so6515183b6e.3 for ; Thu, 16 Jul 2026 09:50:35 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1784220634; x=1784825434; h=content-type:to:from:subject:message-id:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=130vXAEr8kfQks0tdluythHVQMOFL0FGy2rzRI/DZaU=; b=JEu/7TQQ9+EZims/xCIyCUKLfxCMcB1/86KIZv1taQgsNCwF+m9guek1HolIXDWynP qNY66FGbV8y0rh8fOTE97m7xW/ADO8TwIh+e3DOxWMOLhKc6s0C7Rn9Ja3gCkR4bE+/Q SG9qdJWzk2KA3kMc5eGeUNIsUDgQ2ocGxqU4OdxBK/AgqWhjM8Kt9tFdacQK2huzgLFw KQy0G/02yW70IzPnRmessTsoR7DuolzYqL8UbR2taClP6lbJrDUAX005vD9V3mcajPtK Jq5HsE0+YUVqlS0SM7UqrHKFV0Aiqh2dRAogvVK3kP7YqqG9gGZGYWXKstTAl2jkNzFu cLlg== X-Forwarded-Encrypted: i=1; AHgh+RqeLJ+vCaQdzgLN9LbcA+5hEE5Hlr7xYNC4quG3o11D4j0croFV6mSwiX75Kq5LOYiyWehZnwM=@vger.kernel.org X-Gm-Message-State: AOJu0Yxxmp5z6K8FeyXttHyD1+SWEHwr14no1feB3K7aZkOWZNLHB5kI mPhjf2mCAWMSN3U48BZWEs/TRPz1Ce72hGiLqhETeQhSE03PNcO8Nc3E5JXq1h24Dg4kTbVGxXM O/d4pVUTcQcqIbhJfD+rSu7swq0wTV/5fRla6dndRNxy2pDJeKaC/UD3nKc8= Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:6b89:b0:496:301:36b9 with SMTP id 5614622812f47-4a4959865a2mr5532528b6e.0.1784220633954; Thu, 16 Jul 2026 09:50:33 -0700 (PDT) Date: Thu, 16 Jul 2026 09:50:33 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a590bd9.5622734e.c905.0031.GAE@google.com> Subject: [syzbot] [rds?] KCSAN: data-race in rds_sendmsg / rds_sendmsg (3) From: syzbot To: achender@kernel.org, allison.henderson@oracle.com, davem@davemloft.net, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, rds-devel@oss.oracle.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 3b029c035b34 Merge tag 'cgroup-for-7.2-rc3-fixes' of git:/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1638fb89580000 kernel config: https://syzkaller.appspot.com/x/.config?x=84b3039e8461eef5 dashboard link: https://syzkaller.appspot.com/bug?extid=879c1877016972360186 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/9ab6065d4938/disk-3b029c03.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/7373fbe29535/vmlinux-3b029c03.xz kernel image: https://storage.googleapis.com/syzbot-assets/938cb90d037d/bzImage-3b029c03.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+879c1877016972360186@syzkaller.appspotmail.com ================================================================== BUG: KCSAN: data-race in rds_sendmsg / rds_sendmsg write to 0xffff888101dec818 of 8 bytes by task 30904 on cpu 0: rds_sendmsg+0xc1f/0x1580 net/rds/send.c:1332 sock_sendmsg_nosec net/socket.c:775 [inline] __sock_sendmsg net/socket.c:790 [inline] ____sys_sendmsg+0x532/0x580 net/socket.c:2684 ___sys_sendmsg+0x195/0x1e0 net/socket.c:2738 __sys_sendmsg net/socket.c:2770 [inline] __do_sys_sendmsg net/socket.c:2775 [inline] __se_sys_sendmsg net/socket.c:2773 [inline] __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2773 x64_sys_call+0x194c/0x3020 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f write to 0xffff888101dec818 of 8 bytes by task 30905 on cpu 1: rds_sendmsg+0xc1f/0x1580 net/rds/send.c:1332 sock_sendmsg_nosec net/socket.c:775 [inline] __sock_sendmsg net/socket.c:790 [inline] ____sys_sendmsg+0x532/0x580 net/socket.c:2684 ___sys_sendmsg+0x195/0x1e0 net/socket.c:2738 __sys_sendmsg net/socket.c:2770 [inline] __do_sys_sendmsg net/socket.c:2775 [inline] __se_sys_sendmsg net/socket.c:2773 [inline] __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2773 x64_sys_call+0x194c/0x3020 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x0000000000000000 -> 0xffff88811b61faf0 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 30905 Comm: syz.5.5733 Tainted: G W syzkaller #0 PREEMPT(lazy) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 ================================================================== atomic_op ffff888118e74d28 conn xmit_atomic 0000000000000000 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup