From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f206.google.com (mail-oi1-f206.google.com [209.85.167.206]) (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 6D0DC37996C for ; Fri, 31 Jul 2026 07:09:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.206 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785481774; cv=none; b=U444RJNzWhrPUPKDDusWOzxLQdAJl7+YUC982il+pkEL4IdvwfNpONImMNRVRoAAIOxsmlDJMBGzkK+w0ENzXoaqEr4bCkmd6iXEgaCvgKfhcVPM5SeQds/VS1D26M3P49rAXVkkw76vAqkkg4alKn/JCo0AW/pyT3IOqVhnNAU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785481774; c=relaxed/simple; bh=RHs3HORM3qAl8cRMM+EfnzR+WOLDDL+yaQZzKpTV+sI=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=HazvWWIPzYWmc6vRJoWK0sa0qIBm/wmmdkppXDUHKolnP6YNb+t2pofZ7mDb8X3nnSwLOmN584wNsoAzEIsiWj+zrG4hQXoBHcBKfukdEN48HmnLL+bFohvtm9FMaBAPe9ngM58de/H6ml0/cLubzPHrj/duB5SyHxvRN/FYV28= 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=209.85.167.206 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-f206.google.com with SMTP id 5614622812f47-495b0cf250dso502214b6e.3 for ; Fri, 31 Jul 2026 00:09:29 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785481768; x=1786086568; 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=AqWYDbp5+iiLmNvHbFTjk0chA2oTgkuvBGPFunscKgU=; b=cvvtblSI0IIyKRZfSdtCrmr2OW5SUaBcLeLBi9FM16doyMep2Zgof78ukpcPTBHP+/ TQCvweKtNTA/2J5OtEcybUxI+7tPCkxILMFTHQbyWzeOv+ofGtH1vY4Nxrs1HBREWZx7 X5oq8jtGI5CZI6XGrOesO+sddsKFh73VzWT8T17bqRAHag30scPGMfE+5cxrAtkeSmYk WSb7idbRFJ24QZSaLDzpphfwx+2aKnZtlXdD3hABQwInttAjycr1shpGLIY8NiWN0faG fJ1u1/d7QG3aeDqal09MUGVl1MKt4Cx5WF4Q8WlynnhxzHNqJAnKaH5x6iYrneZNYdg2 rBRw== X-Forwarded-Encrypted: i=1; AHgh+RoZc1khBW6wt607g+2Mxwvf9EvU9z5k5UTe8ZhqsFxKnuEIPx+/k7Umx5M0s38mYjV6kQU1vikip2tEiBc=@vger.kernel.org X-Gm-Message-State: AOJu0Ywg8wqvgkhGNYiFSjbNjamrqhHfzPXswOT+8R/zAYGUiIVTo+hT djpKmXFe2GZia8Y6o7aNsiK81FzzkokIQcJ3/uER+FLakGwuO3/nhG105JG3laVOL1ISQEB6rRo LADynfE6Y1BNNAXgKNQHmIL/MDPh0Oc9Xcnz8wbNwCFGddZztQiZPbHz5MUE= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:1a21:b0:4a4:a693:9d87 with SMTP id 5614622812f47-4ae4c4318a1mr652275b6e.5.1785481768459; Fri, 31 Jul 2026 00:09:28 -0700 (PDT) Date: Fri, 31 Jul 2026 00:09:28 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a6c4a28.77639fcc.3d4fd0.0020.GAE@google.com> Subject: [syzbot] [net?] WARNING: suspicious RCU usage in xfrm_do_migrate_state From: syzbot To: davem@davemloft.net, edumazet@google.com, herbert@gondor.apana.org.au, horms@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, steffen.klassert@secunet.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 4235cb24ec1e Merge tag 'vfs-7.2-rc5.fixes' of git://git.ke.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1293a7b1580000 kernel config: https://syzkaller.appspot.com/x/.config?x=145fa60d73086782 dashboard link: https://syzkaller.appspot.com/bug?extid=d3bc2f2eb498a0175940 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10a4c49e580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1475bfde580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/bfb2ad7db60c/disk-4235cb24.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/dfd0a5b6c4bb/vmlinux-4235cb24.xz kernel image: https://storage.googleapis.com/syzbot-assets/44b46af35859/bzImage-4235cb24.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+d3bc2f2eb498a0175940@syzkaller.appspotmail.com ============================= WARNING: suspicious RCU usage syzkaller #0 Not tainted ----------------------------- net/xfrm/xfrm_user.c:1630 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 1 lock held by syz.0.17/5833: #0: ffff888032dcc390 (&net->xfrm.xfrm_cfg_mutex){+.+.}-{4:4}, at: xfrm_netlink_rcv+0x62/0x90 net/xfrm/xfrm_user.c:3928 stack backtrace: CPU: 1 UID: 0 PID: 5833 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 lockdep_rcu_suspicious.cold+0x4f/0xb1 kernel/locking/lockdep.c:6876 xfrm_nlmsg_multicast net/xfrm/xfrm_user.c:1630 [inline] xfrm_send_migrate_state net/xfrm/xfrm_user.c:3340 [inline] xfrm_do_migrate_state+0x2463/0x2f10 net/xfrm/xfrm_user.c:3507 xfrm_user_rcv_msg+0x483/0xd80 net/xfrm/xfrm_user.c:3907 netlink_rcv_skb+0x159/0x420 net/netlink/af_netlink.c:2556 xfrm_netlink_rcv+0x71/0x90 net/xfrm/xfrm_user.c:3929 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x585/0x850 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x8b0/0xda0 net/netlink/af_netlink.c:1900 sock_sendmsg_nosec net/socket.c:775 [inline] __sock_sendmsg net/socket.c:790 [inline] ____sys_sendmsg+0xa4d/0xbe0 net/socket.c:2684 ___sys_sendmsg+0x190/0x1e0 net/socket.c:2738 __sys_sendmsg+0x160/0x210 net/socket.c:2770 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9a1659de99 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe88741d08 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f9a16825fa0 RCX: 00007f9a1659de99 RDX: 0000000000000000 RSI: 0000200000000500 RDI: 0000000000000003 RBP: 00007f9a16633eaf R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9a16825fac R14: 00007f9a16825fa0 R15: 00007f9a16825fa0 --- 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 syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. 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