From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f69.google.com (mail-ot1-f69.google.com [209.85.210.69]) (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 E7D143B52F8 for ; Wed, 25 Feb 2026 12:24:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.69 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772022271; cv=none; b=eqPrsTQurMAaVoWTC8qua1aZ6CRIq8j5b824f5q4/pBuDZlIliBW5qe/U7wqhzEg/Dubm9Om8I2VSzCoey6J/Fx+9zkaUOkep8PVXmcctYu/60Wr2HqXxn4xCFMbNjGyl6Iow4loS0yebC0gcYWpKUgYcLTPh87SDVJx62ppRls= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772022271; c=relaxed/simple; bh=w0RkkI60n0NfVjeD3GCvWy9379xhuF9l5DYLh+Frc74=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=lcHVojBZEeZbjUbvb8umaKp5HXlNZRwOc/TiqADg78331nusFXYGj20FJZsxWDkZlBitnRV1P/mAft9Gw1U5/qcqELEgUiFemSZHEvxmvbJ8fT8cGWoHmUSQZnvDUQ/MODSSbzPoG0ZuGl0vC6HfWsFqbocnhjowuYFNRraW088= 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=209.85.210.69 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-ot1-f69.google.com with SMTP id 46e09a7af769-7d4be1dee67so109938540a34.1 for ; Wed, 25 Feb 2026 04:24:29 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1772022269; x=1772627069; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=vxgM2+7tBarSdr5Mf2egulRHzkOHvLOxJK/f02SHmAk=; b=PjD9lzgbFC5mBSMlu/G5JZ8e5P0ZPFytaEWlQBn/1Uvsbf+UbKP3jAovlpLTPl2mQE QC5P79cCIVYzNw645no+KoUF6Jn1sFMQ7Y3bFJKCe7u2u78AiqySH+CLSI6Na9Dw/guD z5/XqMuzVpoQHGPGk7kzboaFEOcQzyxE+z613HvhrxUoGUmbXB5ij0XaF9KIZ7g3oP9x YNEhR9jkfo6fjVBuMz7bZLGET92qCAx/QfRDPBhhxxyFUgYw2GSlU1rHHBSc6GRaa1SU LaynG1VdgO3jRLLyNEscLuOhyKTzY91MKlhCSWH+L/I9lJhxzdTVg/OVfJ4gj9tBB/jV KC+w== X-Forwarded-Encrypted: i=1; AJvYcCX/h6xo0c4kOqOsAeK2pJyA/tT6ezgXT90J407JVUoqn9OW4dD6XiKWCO/3lR1eNYwdWoJ5O3Y=@vger.kernel.org X-Gm-Message-State: AOJu0Yzs+gEmB9M0JV/Ly+3ZMGwba2RZSp57J5i7dF7U4WUdNSZbDXXC axeZMfXm8Sxhy/f60+LChHQSXr+lDMtwfg/gU8wksUa62RcTcuVPcHPSJAPRlk/gTMD6u2UUzFp EZUp8Psp+5Teb8EfbT+O/EunCP2KIFCt8BOVrRxqpnPen8t/hB1cVhwNUVPI= Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:16a3:b0:679:94ff:6ea7 with SMTP id 006d021491bc7-679c4251e3dmr8290560eaf.15.1772022268917; Wed, 25 Feb 2026 04:24:28 -0800 (PST) Date: Wed, 25 Feb 2026 04:24:28 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <699ee9fc.050a0220.1cd54b.0009.GAE@google.com> Subject: [syzbot] [net?] [bpf?] KCSAN: data-race in sk_psock_drop / unix_stream_sendmsg From: syzbot To: andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, davem@davemloft.net, edumazet@google.com, horms@kernel.org, jakub@cloudflare.com, john.fastabend@gmail.com, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 23b0f90ba871 Merge tag 'sysctl-7.00-rc1' of git://git.kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13f3695a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=70c3ed59b49365c3 dashboard link: https://syzkaller.appspot.com/bug?extid=87f770387a9e5dc6b79b compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/ae3bcc875a04/disk-23b0f90b.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/1a4dbd53da8f/vmlinux-23b0f90b.xz kernel image: https://storage.googleapis.com/syzbot-assets/3c3824777f5c/bzImage-23b0f90b.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+87f770387a9e5dc6b79b@syzkaller.appspotmail.com ================================================================== BUG: KCSAN: data-race in sk_psock_drop / unix_stream_sendmsg write to 0xffff88810220dc08 of 8 bytes by task 3611 on cpu 1: sk_psock_stop_verdict net/core/skmsg.c:1311 [inline] sk_psock_drop+0x12f/0x270 net/core/skmsg.c:896 sk_psock_put include/linux/skmsg.h:506 [inline] sock_map_unref+0x2a5/0x300 net/core/sock_map.c:185 __sock_map_delete net/core/sock_map.c:426 [inline] sock_map_delete_from_link net/core/sock_map.c:439 [inline] sock_map_unlink net/core/sock_map.c:1608 [inline] sock_map_remove_links+0x228/0x340 net/core/sock_map.c:1623 sock_map_close+0xa1/0x340 net/core/sock_map.c:1684 unix_release+0x4e/0x80 net/unix/af_unix.c:1183 __sock_release net/socket.c:662 [inline] sock_close+0x6b/0x150 net/socket.c:1455 __fput+0x29b/0x650 fs/file_table.c:469 fput_close_sync+0xad/0x190 fs/file_table.c:574 __do_sys_close fs/open.c:1509 [inline] __se_sys_close fs/open.c:1494 [inline] __x64_sys_close+0x55/0xf0 fs/open.c:1494 x64_sys_call+0x275d/0x3020 arch/x86/include/generated/asm/syscalls_64.h:4 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff88810220dc08 of 8 bytes by task 3605 on cpu 0: unix_stream_sendmsg+0x7f8/0xbb0 net/unix/af_unix.c:2480 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0x5af/0x600 net/socket.c:2592 ___sys_sendmsg+0x195/0x1e0 net/socket.c:2646 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2681 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+0x12c/0x370 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0xffffffff8486dd00 -> 0xffffffff8472c9f0 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 3605 Comm: syz.4.30 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 ================================================================== --- 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