From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f70.google.com (mail-oo1-f70.google.com [209.85.161.70]) (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 5FA96263C8C for ; Sun, 15 Feb 2026 20:21:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.70 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771186892; cv=none; b=mcwQw3kJpgzC48E+8kYCiqBgv6peNua6n5WlnLCNUUv/jcaUaXD8xMWB9eJZK/rWyRBS8tyqvlb4ErXrM0Ag468j07pskWcT/9C2Bnoc+QlJ6kHqWZXNgR//UBR77S3cO/DnNG1I94vID9CZMt28eL/qHD5TkopUi8jI4V7qhLU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771186892; c=relaxed/simple; bh=misesBBnWan8eGwYsqMIxMXKery3rircp+T1au2mX3c=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=lftpvZiSswlugLNKMvZNGGols+Hee/X1gQRNC9/yOewvCz7dWYJ3uOLH4VQ8hxoQHy2mUd61oRaDZAfeqB3hhwFFeiuJ7HwAdJ/aLrhE8M8BndBHmtw9K33Ww3412wNVPefPJfotxpv25DURbnaG2NdMkFq8JzirtDka84GZxN4= 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=209.85.161.70 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-oo1-f70.google.com with SMTP id 006d021491bc7-678f3fef828so18249290eaf.1 for ; Sun, 15 Feb 2026 12:21:30 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1771186889; x=1771791689; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=qmqIEV1uSWubq+ImbJ9wiQZJTfCDAV0EkiIVsRLJzxU=; b=j7NuSf2qSCNcCpHr5m//8H0T8KjYx+WOwWnoyHuXIceDQ8RO62hPSFdk5J5QcgyyCp /sShrrwqylR4z8j/XVJoyuYgtyFo6eJG9xSRpvsR/9LDmrnB406rBVoUmtTEpX0G8VLm w4VLOZTkwPowgBTklIl80D6p9mgTQTKkr/ghtGUxNSFmXPEhgL9fLLmbrurnaPCloymW KpqkLrr2mDrWZ1YB7kYyi0NiO+LRwx6Km8hw7w+/MlcAgkv1ZJFtSVJh72tMqWfb4gia 4EnUOFyka+OKlEVaB77f46Ed34ETgdeF/JSi3VcghwT8FRvyYW6XTNzVhh0mq9HrL+fM aD0w== X-Forwarded-Encrypted: i=1; AJvYcCXdci0Ffj6aO2C5pDGmRH3aWVCVWZz6tpo3HBH/2VRsUDbD+/f5FUEztco2Qvy3z5Fkw7krGlU=@vger.kernel.org X-Gm-Message-State: AOJu0YwUgbE7RdvcRPNLeQ6ryPY4tKIjWqd7XoTFtd2BXOd0TLAkbQGG 0tEAIPN0O2RUXXXMkWbDID9zlZbp0V5US+PBnv1zX+3qYzbCO7k42QFpUw85aP/s63FhB1/yMGP HQKf++AOuQtDyiY/EcYdZIZLpL4g8bgxza4DZwUU+/y4C1Svjuo8Hu7hN+ps= Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1a0b:b0:676:e8d1:bb49 with SMTP id 006d021491bc7-6776968feb8mr4437870eaf.69.1771186889442; Sun, 15 Feb 2026 12:21:29 -0800 (PST) Date: Sun, 15 Feb 2026 12:21:29 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69922ac9.a70a0220.2c38d7.00e1.GAE@google.com> Subject: [syzbot] [net?] [bpf?] KCSAN: data-race in __udp_enqueue_schedule_skb / sk_psock_drop 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: f14faaf3a1fb Merge tag 'tsm-fixes-for-6.19' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=125c6402580000 kernel config: https://syzkaller.appspot.com/x/.config?x=8e27f4588a0f2183 dashboard link: https://syzkaller.appspot.com/bug?extid=113cea56c13a8a1e95ab 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/9cdf3c60fee1/disk-f14faaf3.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/24b163320d00/vmlinux-f14faaf3.xz kernel image: https://storage.googleapis.com/syzbot-assets/854533a48cfc/bzImage-f14faaf3.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+113cea56c13a8a1e95ab@syzkaller.appspotmail.com ================================================================== BUG: KCSAN: data-race in __udp_enqueue_schedule_skb / sk_psock_drop write to 0xffff88811d063048 of 8 bytes by task 23114 on cpu 0: sk_psock_stop_verdict net/core/skmsg.c:1287 [inline] sk_psock_drop+0x12f/0x270 net/core/skmsg.c:873 sk_psock_put include/linux/skmsg.h:473 [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 inet_release+0xcd/0xf0 net/ipv4/af_inet.c:437 __sock_release net/socket.c:662 [inline] sock_close+0x6b/0x150 net/socket.c:1455 __fput+0x29b/0x650 fs/file_table.c:468 ____fput+0x1c/0x30 fs/file_table.c:496 task_work_run+0x130/0x1a0 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:44 [inline] exit_to_user_mode_loop+0x1f7/0x6f0 kernel/entry/common.c:75 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline] do_syscall_64+0x1d3/0x2a0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff88811d063048 of 8 bytes by task 23117 on cpu 1: __udp_enqueue_schedule_skb+0x6c1/0x840 net/ipv4/udp.c:1789 __udp_queue_rcv_skb net/ipv4/udp.c:2346 [inline] udp_queue_rcv_one_skb+0x709/0xc20 net/ipv4/udp.c:2475 udp_queue_rcv_skb+0x20e/0x2b0 net/ipv4/udp.c:2493 __udp4_lib_mcast_deliver+0x6e8/0x790 net/ipv4/udp.c:2585 __udp4_lib_rcv+0x96f/0x1260 net/ipv4/udp.c:2724 udp_rcv+0x4f/0x60 net/ipv4/udp.c:2911 ip_protocol_deliver_rcu+0x3f9/0x780 net/ipv4/ip_input.c:207 ip_local_deliver_finish+0x1fc/0x2f0 net/ipv4/ip_input.c:241 NF_HOOK include/linux/netfilter.h:318 [inline] ip_local_deliver+0xe8/0x1e0 net/ipv4/ip_input.c:262 dst_input include/net/dst.h:474 [inline] ip_sublist_rcv_finish net/ipv4/ip_input.c:584 [inline] ip_list_rcv_finish net/ipv4/ip_input.c:628 [inline] ip_sublist_rcv+0x42b/0x6d0 net/ipv4/ip_input.c:644 ip_list_rcv+0x261/0x290 net/ipv4/ip_input.c:678 __netif_receive_skb_list_ptype net/core/dev.c:6195 [inline] __netif_receive_skb_list_core+0x4dc/0x500 net/core/dev.c:6242 __netif_receive_skb_list net/core/dev.c:6294 [inline] netif_receive_skb_list_internal+0x47d/0x5f0 net/core/dev.c:6385 netif_receive_skb_list+0x31/0x1f0 net/core/dev.c:6437 xdp_recv_frames net/bpf/test_run.c:269 [inline] xdp_test_run_batch net/bpf/test_run.c:350 [inline] bpf_test_run_xdp_live+0x104c/0x1360 net/bpf/test_run.c:379 bpf_prog_test_run_xdp+0x57b/0xa10 net/bpf/test_run.c:1396 bpf_prog_test_run+0x204/0x340 kernel/bpf/syscall.c:4703 __sys_bpf+0x4c0/0x7b0 kernel/bpf/syscall.c:6182 __do_sys_bpf kernel/bpf/syscall.c:6274 [inline] __se_sys_bpf kernel/bpf/syscall.c:6272 [inline] __x64_sys_bpf+0x41/0x50 kernel/bpf/syscall.c:6272 x64_sys_call+0x28e1/0x3000 arch/x86/include/generated/asm/syscalls_64.h:322 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc0/0x2a0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0xffffffff847b24d0 -> 0xffffffff84673410 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 23117 Comm: syz.8.5085 Tainted: G W syzkaller #0 PREEMPT(voluntary) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 ================================================================== --- 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